input field is read only after removing disabled attribute with jquery - javascript

A strange one here guys.
I have a form with a number of fields and one submit button. All of the fields are set to disabled at first except the email field.
I have a method which runs and checks the email field for changes. If it changes then all the other fields are enabled. This works perfectly in firefox, chrome and internet explorer 7/8/9 but in 10 it will not work as shown.
In IE10 all the fields which should be disabled are, but the email field which is not greyed out behaves as if its read only and will not allow entry or focus.
I was initially using the .prop() method to change the disabled state but some of the older IE versions has issues with it so I have instead used the attr() and removeAttribute() methods. Any ideas are appreciated.
Solutions added below - Thanks everyone!!
<form id="query_form" class="form-inline" enctype="multipart/form-data" action="" method="post">
<input type="text" class="input-large" placeholder="email" id="email" name="email" value="" />
<input type="text" class="input-small" placeholder="start date" id="sd" name="sd" value="" disabled="disabled"/>
<input type="text" id="ed" class="input-small" placeholder="end date" name="ed" value="" disabled="disabled"/>
<button type="submit" class="btn" id="run_query" name="run_query" disabled="disabled">Run Query</button>
</form>
function check_required_fields(){
var email = $.trim($("#email").val());
if(email.length > 0){
$("#query_form").find(":input").not("#email").each(function() {
$(this).removeAttr('disabled');
});
}else{
$("#query_form").find(":input").not("#email").each(function() {
$(this).attr('disabled', true);
});
}
}
$(document).ready(function(){
var timer;
$("#email").on("change keyup paste", function () {
clearTimeout(timer);
timer = setTimeout(function () {
check_required_fields()
}, 0);
}).triggerHandler('change');
});
Finally one more tidbit of information I'm using Jquery 1.8.3 and am using bootstrap. The console in firebug shows no errors of any kind nor does developer tools in IE10.
Final piece of the puzzle.
In another script I am using the same code with one edit, it operates on two fields. Thus it looks like following:
<form id="query_form" enctype="multipart/form-data" action="" method="post">
<input type="text" class="input-large" placeholder="email" id="email" name="email" value="" />
<select id="qt" name="qt">
<option selected="selected" value="">select query type...</option>
<option value="taxon_group">species group</option>
<option value="site_name">site name</option>
<option value="taxon_name">species name</option>
</select>
<input type="text" id="ed" class="input-large" placeholder="end date" name="ed" value="" disabled="disabled"/>
<button type="submit" class="btn" id="run_query" name="run_query" disabled="disabled">Run Query</button>
</form>
function check_required_fields(){
var email = $.trim($("#email").val());
var query_type = $("#qt").val();
if(email.length > 0 && query_type.length > 0){
$("#query_form").find(":input").not("#email, #qt").each(function() {
$(this).removeAttr('disabled');
});
}else{
$("#query_form").find(":input").not("#email, #qt").each(function() {
$(this).attr('disabled', 'disabled');
});
}
}
$(document).ready(function(){
var timer;
$("#email, #qt").on("change keyup paste", function () {
clearTimeout(timer);
timer = setTimeout(function () {
check_required_fields()
}, 0);
}).triggerHandler('change');
});
Things work well except that the email field looses focus after each key press in IE10. Any ideas why? It does not happen in the other script with the same function applied to just the email field.


Remove the oninput event, looks like interfering with attribute placeholder in IE10. BTW, as you were already binding onkeyup and onchange bound onpaste instead which should give finally quite the same behaviour as oninput used with keyup/change.
You have to delayed a little events in order to make onpaste working and btw to avoid useless multi calls.
DEMO
$(document).ready(function () {
var timer;
$("#email").on("change keyup paste", function () {
clearTimeout(timer);
timer = setTimeout(function () {
check_required_fields()
}, 0);
}).triggerHandler('change');
});


There is an easy way to achieve this if you are open to suggestions.
$(function(){
$("#email").keyup(function(){
if($(this).val().length <= 0){
$(this).siblings().each(function(){
$(this).attr("disabled", true);
});
}
else{
$(this).siblings().each(function(){
$(this).attr("disabled", false);
});
}
});
});
Here is a fiddle: http://jsfiddle.net/6GnUS/10/


You need to call .change after
$(this).prop('disabled', false).change();


I think you need to change
$(this).attr('disabled', true);
to
$(this).attr('disabled');

Related

How to disable a button when the input field is empty? [duplicate]

I have this HTML:
<input type="text" name="textField" />
<input type="submit" value="send" />
How can I do something like this:
When the text field is empty the submit should be disabled (disabled="disabled").
When something is typed in the text field to remove the disabled attribute.
If the text field becomes empty again(the text is deleted) the submit button should be disabled again.
I tried something like this:
$(document).ready(function(){
$('input[type="submit"]').attr('disabled','disabled');
$('input[type="text"]').change(function(){
if($(this).val != ''){
$('input[type="submit"]').removeAttr('disabled');
}
});
});
…but it doesn't work. Any ideas?

The problem is that the change event fires only when focus is moved away from the input (e.g. someone clicks off the input or tabs out of it). Try using keyup instead:
$(document).ready(function() {
$(':input[type="submit"]').prop('disabled', true);
$('input[type="text"]').keyup(function() {
if($(this).val() != '') {
$(':input[type="submit"]').prop('disabled', false);
}
});
});

$(function() {
$(":text").keypress(check_submit).each(function() {
check_submit();
});
});
function check_submit() {
if ($(this).val().length == 0) {
$(":submit").attr("disabled", true);
} else {
$(":submit").removeAttr("disabled");
}
}

This question is 2 years old but it's still a good question and it was the first Google result, but all of the existing answers recommend setting and removing the HTML attribute (removeAttr("disabled")) "disabled", which is not the right approach. There is a lot of confusion regarding attribute vs. property.
HTML
The "disabled" in <input type="button" disabled> in the markup is called a boolean attribute by the W3C.
HTML vs. DOM
Quote:
A property is in the DOM; an attribute is in the HTML that is parsed into the DOM.
https://stackoverflow.com/a/7572855/664132
jQuery
Related:
Nevertheless, the most important concept to remember about the checked attribute is that it does not correspond to the checked property. The attribute actually corresponds to the defaultChecked property and should be used only to set the initial value of the checkbox. The checked attribute value does not change with the state of the checkbox, while the checked property does. Therefore, the cross-browser-compatible way to determine if a checkbox is checked is to use the property.
Relevant:
Properties generally affect the dynamic state of a DOM element without changing the serialized HTML attribute. Examples include the value property of input elements, the disabled property of inputs and buttons, or the checked property of a checkbox. The .prop() method should be used to set disabled and checked instead of the .attr() method.
$( "input" ).prop( "disabled", false );
Summary
To [...] change DOM properties such as the [...] disabled state of form elements, use the .prop() method.
(http://api.jquery.com/attr/)
As for the disable on change part of the question: There is an event called "input", but browser support is limited and it's not a jQuery event, so jQuery won't make it work. The change event works reliably, but is fired when the element loses focus. So one might combine the two (some people also listen for keyup and paste).
Here's an untested piece of code to show what I mean:
$(document).ready(function() {
var $submit = $('input[type="submit"]');
$submit.prop('disabled', true);
$('input[type="text"]').on('input change', function() { //'input change keyup paste'
$submit.prop('disabled', !$(this).val().length);
});
});

To remove disabled attribute use,
$("#elementID").removeAttr('disabled');
and to add disabled attribute use,
$("#elementID").prop("disabled", true);
Enjoy :)

or for us that dont like to use jQ for every little thing:
document.getElementById("submitButtonId").disabled = true;

eric, your code did not seem to work for me when the user enters text then deletes all the text. i created another version if anyone experienced the same problem. here ya go folks:
$('input[type="submit"]').attr('disabled','disabled');
$('input[type="text"]').keyup(function(){
if($('input[type="text"]').val() == ""){
$('input[type="submit"]').attr('disabled','disabled');
}
else{
$('input[type="submit"]').removeAttr('disabled');
}
})

It will work like this:
$('input[type="email"]').keyup(function() {
if ($(this).val() != '') {
$(':button[type="submit"]').prop('disabled', false);
} else {
$(':button[type="submit"]').prop('disabled', true);
}
});
Make sure there is an 'disabled' attribute in your HTML

We can simply have if & else .if suppose your input is empty we can have
if($(#name).val() != '') {
$('input[type="submit"]').attr('disabled' , false);
}
else we can change false into true

you can also use something like this :
$(document).ready(function() {
$('input[type="submit"]').attr('disabled', true);
$('input[type="text"]').on('keyup',function() {
if($(this).val() != '') {
$('input[type="submit"]').attr('disabled' , false);
}else{
$('input[type="submit"]').attr('disabled' , true);
}
});
});
here is Live example

For form login:
<form method="post" action="/login">
<input type="text" id="email" name="email" size="35" maxlength="40" placeholder="Email" />
<input type="password" id="password" name="password" size="15" maxlength="20" placeholder="Password"/>
<input type="submit" id="send" value="Send">
</form>
Javascript:
$(document).ready(function() {
$('#send').prop('disabled', true);
$('#email, #password').keyup(function(){
if ($('#password').val() != '' && $('#email').val() != '')
{
$('#send').prop('disabled', false);
}
else
{
$('#send').prop('disabled', true);
}
});
});

Here's the solution for file input field.
To disable a submit button for file field when a file is not chosen, then enable after the user chooses a file to upload:
$(document).ready(function(){
$("#submitButtonId").attr("disabled", "disabled");
$("#fileFieldId").change(function(){
$("#submitButtonId").removeAttr("disabled");
});
});
Html:
<%= form_tag your_method_path, :multipart => true do %><%= file_field_tag :file, :accept => "text/csv", :id => "fileFieldId" %><%= submit_tag "Upload", :id => "submitButtonId" %><% end %>

If the button is itself a jQuery styled button (with .button()) you will need to refresh the state of the button so that the correct classes are added / removed once you have removed/added the disabled attribute.
$( ".selector" ).button( "refresh" );

The answers above don't address also checking for menu based cut/paste events. Below's the code that I use to do both. Note the action actually happens with a timeout because the cut and past events actually fire before the change happened, so timeout gives a little time for that to happen.
$( ".your-input-item" ).bind('keyup cut paste',function() {
var ctl = $(this);
setTimeout(function() {
$('.your-submit-button').prop( 'disabled', $(ctl).val() == '');
}, 100);
});

Disable: $('input[type="submit"]').prop('disabled', true);
Enable: $('input[type="submit"]').removeAttr('disabled');
The above enable code is more accurate than:
$('input[type="submit"]').removeAttr('disabled');
You can use both methods.

Vanilla JS Solution. It works for a whole form not only one input.
In question selected JavaScript tag.
HTML Form:
var form = document.querySelector('form')
var inputs = form.querySelectorAll('input')
var required_inputs = form.querySelectorAll('input[required]')
var register = document.querySelector('input[type="submit"]')
form.addEventListener('keyup', function(e) {
var disabled = false
inputs.forEach(function(input, index) {
if (input.value === '' || !input.value.replace(/\s/g, '').length) {
disabled = true
}
})
if (disabled) {
register.setAttribute('disabled', 'disabled')
} else {
register.removeAttribute('disabled')
}
})
<form action="/signup">
<div>
<label for="username">User Name</label>
<input type="text" name="username" required/>
</div>
<div>
<label for="password">Password</label>
<input type="password" name="password" />
</div>
<div>
<label for="r_password">Retype Password</label>
<input type="password" name="r_password" />
</div>
<div>
<label for="email">Email</label>
<input type="text" name="email" />
</div>
<input type="submit" value="Signup" disabled="disabled" />
</form>
Some explanation:
In this code we add keyup event on html form and on every keypress check all input fields. If at least one input field we have are empty or contains only space characters then we assign the true value to disabled variable and disable submit button.
If you need to disable submit button until all required input fields are filled in - replace:
inputs.forEach(function(input, index) {
with:
required_inputs.forEach(function(input, index) {
where required_inputs is already declared array containing only required input fields.

I had to work a bit to make this fit my use case.
I have a form where all fields must have a value before submitting.
Here's what I did:
$(document).ready(function() {
$('#form_id button[type="submit"]').prop('disabled', true);
$('#form_id input, #form_id select').keyup(function() {
var disable = false;
$('#form_id input, #form_id select').each(function() {
if($(this).val() == '') { disable = true };
});
$('#form_id button[type="submit"]').prop('disabled', disable);
});
});
Thanks to everyone for their answers here.

Please see the below code to enable or disable Submit button
If Name and City fields has value then only Submit button will be enabled.
<script>
$(document).ready(function() {
$(':input[type="submit"]').prop('disabled', true);
$('#Name').keyup(function() {
ToggleButton();
});
$('#City').keyup(function() {
ToggleButton();
});
});
function ToggleButton() {
if (($('#Name').val() != '') && ($('#City').val() != '')) {
$(':input[type="submit"]').prop('disabled', false);
return true;
} else {
$(':input[type="submit"]').prop('disabled', true);
return false;
}
} </script>
<form method="post">
<div class="row">
<div class="col-md-4">
<h2>Getting started</h2>
<fieldset>
<label class="control-label text-danger">Name</label>
<input type="text" id="Name" name="Name" class="form-control" />
<label class="control-label">Address</label>
<input type="text" id="Address" name="Address" class="form-control" />
<label class="control-label text-danger">City</label>
<input type="text" id="City" name="City" class="form-control" />
<label class="control-label">Pin</label>
<input type="text" id="Pin" name="Pin" class="form-control" />
<input type="submit" value="send" class="btn btn-success" />
</fieldset>
</div>
</div>
</form>

take look at this snippet from my project
$("input[type="submit"]", "#letter-form").on("click",
function(e) {
e.preventDefault();
$.post($("#letter-form").attr('action'), $("#letter-form").serialize(),
function(response) {// your response from form submit
if (response.result === 'Redirect') {
window.location = response.url;
} else {
Message(response.saveChangesResult, response.operation, response.data);
}
});
$(this).attr('disabled', 'disabled'); //this is what you want
so just disabled the button after your operation executed
$(this).attr('disabled', 'disabled');

Al types of solution are supplied. So I want to try for a different solution. Simply it will be more easy if you add a id attribute in your input fields.
<input type="text" name="textField" id="textField"/>
<input type="submit" value="send" id="submitYesNo"/>
Now here is your jQuery
$("#textField").change(function(){
if($("#textField").val()=="")
$("#submitYesNo").prop('disabled', true)
else
$("#submitYesNo").prop('disabled', false)
});

Try
let check = inp=> inp.nextElementSibling.disabled = !inp.value;
<input type="text" name="textField" oninput="check(this)"/>
<input type="submit" value="send" disabled />

I Hope below code will help someone ..!!! :)
jQuery(document).ready(function(){
jQuery("input[type=submit]").prop('disabled', true);
jQuery("input[name=textField]").focusin(function(){
jQuery("input[type=submit]").prop('disabled', false);
});
jQuery("input[name=textField]").focusout(function(){
var checkvalue = jQuery(this).val();
if(checkvalue!=""){
jQuery("input[type=submit]").prop('disabled', false);
}
else{
jQuery("input[type=submit]").prop('disabled', true);
}
});
}); /*DOC END*/

Multiple form validation with same function

I am using form twice on same page.
HTML Code
<form action="post.php" method="POST" onsubmit="return checkwebform();">
<input id="codetext" maxlength="5" name="codetext" type="text" value="" placeholder="Enter here" />
<input class="button" type="submit" value="SUMBIT" />
</form>
It's working fine with one form but when i add same form again then it stop working. The second form start showing error popup alert but even i enter text in form field.
JS Code
function checkwebform()
{
var codecheck = jQuery('#codetext').val();
if(codecheck.length != 5)
{
alert('Invalid Entry');
} else {
showhidediv('div-info');
}
return false;
}
How can i make it to validate other forms on page using same function?

As I commented, you can't have more than one element with the same id. It's against HTML specification and jQuery id selector only returns the first one (even if you have multiple).
As if you're using jQuery, I might suggest another approach to accomplish your goal.
First of all, get rid of the codetext id. Then, instead of using inline events (they are considered bad practice, as pointed in the MDN documentation), like you did, you can specify an event handler with jQuery using the .on() method.
Then, in the callback function, you can reference the form itself with $(this) and use the method find() to locate a child with the name codetext.
And, if you call e.preventDefault(), you cancel the form submission.
My suggestion:
HTML form (can repeat as long as you want):
<form action="post.php" method="POST">
<input maxlength="5" name="codetext" type="text" value="" placeholder="Enter here" />
<input class="button" type="submit" value="SUMBIT" />
</form>
JS:
$(document).ready(function() {
//this way, you can create your forms dynamically (don't know if it's the case)
$(document).on("submit", "form", function(e) {
//find the input element of this form with name 'codetext'
var inputCodeText = $(this).find("input[name='codetext']");
if(inputCodeText.val().length != 5) {
alert('Invalid Entry');
e.preventDefault(); //cancel the default behavior (form submit)
return; //exit the function
}
//when reaches here, that's because all validation is fine
showhidediv('div-info');
//the form will be submited here, but if you don't want this never, just move e.preventDefault() from outside that condition to here; return false will do the trick, too
});
});
Working demo: https://jsfiddle.net/mrlew/8kb9rzvv/

Problem, that you will have multiple id codetext.
You need to change your code like that:
<form action="post.php" method="POST">
<input maxlength="5" name="codetext" type="text" value="" placeholder="Enter here" />
<input class="button" type="submit" value="SUMBIT" />
</form>
<form action="post.php" method="POST">
<input maxlength="5" name="codetext" type="text" value="" placeholder="Enter here" />
<input class="button" type="submit" value="SUMBIT" />
</form>
And your JS:
$(document).ready(function(){
$('form').submit(function(){
var codecheck = $(this).find('input[name=codetext]').val();
if(codecheck.length != 5)
{
alert('Invalid Entry');
} else {
showhidediv('div-info');
}
return false;
})
})

How to disable submit button until all text fields are full and file is selected

I'm new to javascript / jquery so I may be missing something obvious, but I've found solutions that disable the submit button until all text fields are filled, and I've found solutions that disable it until a file is chosen. However, my form consists of a file input and 3 text fields and I cannot find a way of it being disabled until all text fields AND a file is chosen.
The distilled version of the code I'm working with is here:
HTML
<div>
<input type="file" /><br />
<input type="text" /><br />
<input type="text" /><br />
<input type="text" /><br />
<input type="submit" value="Upload" class="submit" id="submit" disabled="disabled" />
</div>
JS
$('.submit').click(function() {
var empty = $(this).parent().find("input").filter(function() {
return this.value === "";
});
if(empty.length) {
$('.submit').prop('disabled', false);
}
});
})()
Thanks for your help
https://jsfiddle.net/xG2KS/482/

Try capture the event on those field and checking the empty values by using another function, see below code :
$(':input').on('change keyup', function () {
// call the function after
// both change and keyup event trigger
var k = checking();
// if value inc not 0
if (k) $('.submit').prop('disabled', true);
// if value inc is 0
else $('.submit').prop('disabled', false);
});
// this function check for empty values
function checking() {
var inc = 0;
// capture all input except submit button
$(':input:not(:submit)').each(function () {
if ($(this).val() == "") inc++;
});
return inc;
}
This is just an example, but the logic somehow like that.
Update :
Event Delegation. You might need read this
// document -> can be replaced with nearest parent/container
// which is already exist on the page,
// something that hold dynamic data(in your case form input)
$(document).on('change keyup',':input', function (){..});
DEMO

Please see this fiddle https://jsfiddle.net/xG2KS/482/
$('input').on('change',function(){
var empty = $('div').find("input").filter(function() {
return this.value === "";
});
if(empty.length>0) {
$('.submit').prop('disabled', true);
}
else{
$('.submit').prop('disabled', false);
}
});
[1]:

The trick is
don’t disable the submit button; otherwise the user can’t click on it and testing won’t work
only when processing, only return true if all tests are satisfied
Here is a modified version of the HTML:
<form id="test" method="post" enctype="multipart/form-data" action="">
<input type="file" name="file"><br>
<input type="text" name="name"><br>
<input type="text" name="email"><br>
<button name="submit" type="submit">Upload</button>
</form>
and some pure JavaScript:
window.onload=init;
function init() {
var form=document.getElementById('test');
form.onsubmit=testSubmit;
function testSubmit() {
if(!form['file'].value) return false;
if(!form['name'].value) return false;
if(!form['email'].value) return false;
}
}
Note that I have removed all traces of XHTML in the HTML. That’s not necessary, of course, but HTML5 does allow a simpler version of the above, without JavaScript. Simply use the required attribute:
<form id="test" method="post" enctype="multipart/form-data" action="">
<input type="file" name="file" required><br>
<input type="text" name="name" required><br>
<input type="text" name="email" required><br>
<button name="submit" type="submit">Upload</button>
</form>
This prevents form submission if a required field is empty and works for all modern (not IE8) browsers.

Listen for the input event on file and text input elements, count number of unfilled inputs and, set the submit button's disabled property based on that number. Check out the demo below.
$(':text,:file').on('input', function() {
//find number of unfilled inputs
var n = $(':text,:file').filter(function() {
return this.value.trim().length == 0;
}).length;
//set disabled property of submit based on number
$('#submit').prop('disabled', n != 0);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div>
<input type="file" /><br />
<input type="text" /><br />
<input type="text" /><br />
<input type="text" /><br />
<input type="submit" value="Upload" class="submit" id="submit" disabled="disabled" />
</div>

For my approach, I'd rather use array to store if all the conditions are true. Then use every to make sure that all is true
$(function(){
function validateSubmit()
{
var result = [];
$('input[type=file], input[type=text]').each(function(){
if ($(this).val() == "")
result.push(false);
else
result.push(true);
});
return result;
}
$('input[type=file], input[type=text]').bind('change keyup', function(){
var res = validateSubmit().every(function(elem){
return elem == true;
});
if (res)
$('input[type=submit]').attr('disabled', false);
else
$('input[type=submit]').attr('disabled', true);
});
});
Fiddle

Leaving page javascript/jquery

My question is a continuation of this post https://stackoverflow.com/questions/22438863/javascript-jquery-for-before-leaving-the-page?noredirect=1#comment34138272_22438863, it's a new function.
Am looking for below function:
In stackoverflow, if you type some answers and if you try to close that tab it will ask for confirmation message..
Below is my Html part:
<form id="demo">
<input type="text" id="name" name=""/>
<input type="email" id="emails" name=""/>
<input type="number" id="ph" name=""/>
<select name="" id="sample">
<option>Select</option>
<option value="1">Chennai</option>
<option value="2">Hyderabad</option>
</select>
</form>
If user enters something and he clicks on logo to navigate away it asks for confirm message..its natural right???Even stackoerflow has this function..I tried this code but didn't worked
var changesMade = false;
function onDataChanged() {
changesMade = true;
}
$('input:text, textarea, select').change(onDataChanged);
$('input:checkbox, input:radio').click(onDataChanged);
$("#homeicon").click(function() {
if (changesMade) {
return 'Changes have been made. Are you sure you want to leave the page?';
location.href = "home.html";
} else {
return null;
}
});

You are looking for onbeforeunload or beforeunload in jQuery.
check here as well as googling for other places with that term.

jQuery disable/enable submit button

I have this HTML:
<input type="text" name="textField" />
<input type="submit" value="send" />
How can I do something like this:
When the text field is empty the submit should be disabled (disabled="disabled").
When something is typed in the text field to remove the disabled attribute.
If the text field becomes empty again(the text is deleted) the submit button should be disabled again.
I tried something like this:
$(document).ready(function(){
$('input[type="submit"]').attr('disabled','disabled');
$('input[type="text"]').change(function(){
if($(this).val != ''){
$('input[type="submit"]').removeAttr('disabled');
}
});
});
…but it doesn't work. Any ideas?

The problem is that the change event fires only when focus is moved away from the input (e.g. someone clicks off the input or tabs out of it). Try using keyup instead:
$(document).ready(function() {
$(':input[type="submit"]').prop('disabled', true);
$('input[type="text"]').keyup(function() {
if($(this).val() != '') {
$(':input[type="submit"]').prop('disabled', false);
}
});
});

$(function() {
$(":text").keypress(check_submit).each(function() {
check_submit();
});
});
function check_submit() {
if ($(this).val().length == 0) {
$(":submit").attr("disabled", true);
} else {
$(":submit").removeAttr("disabled");
}
}

This question is 2 years old but it's still a good question and it was the first Google result, but all of the existing answers recommend setting and removing the HTML attribute (removeAttr("disabled")) "disabled", which is not the right approach. There is a lot of confusion regarding attribute vs. property.
HTML
The "disabled" in <input type="button" disabled> in the markup is called a boolean attribute by the W3C.
HTML vs. DOM
Quote:
A property is in the DOM; an attribute is in the HTML that is parsed into the DOM.
https://stackoverflow.com/a/7572855/664132
jQuery
Related:
Nevertheless, the most important concept to remember about the checked attribute is that it does not correspond to the checked property. The attribute actually corresponds to the defaultChecked property and should be used only to set the initial value of the checkbox. The checked attribute value does not change with the state of the checkbox, while the checked property does. Therefore, the cross-browser-compatible way to determine if a checkbox is checked is to use the property.
Relevant:
Properties generally affect the dynamic state of a DOM element without changing the serialized HTML attribute. Examples include the value property of input elements, the disabled property of inputs and buttons, or the checked property of a checkbox. The .prop() method should be used to set disabled and checked instead of the .attr() method.
$( "input" ).prop( "disabled", false );
Summary
To [...] change DOM properties such as the [...] disabled state of form elements, use the .prop() method.
(http://api.jquery.com/attr/)
As for the disable on change part of the question: There is an event called "input", but browser support is limited and it's not a jQuery event, so jQuery won't make it work. The change event works reliably, but is fired when the element loses focus. So one might combine the two (some people also listen for keyup and paste).
Here's an untested piece of code to show what I mean:
$(document).ready(function() {
var $submit = $('input[type="submit"]');
$submit.prop('disabled', true);
$('input[type="text"]').on('input change', function() { //'input change keyup paste'
$submit.prop('disabled', !$(this).val().length);
});
});

To remove disabled attribute use,
$("#elementID").removeAttr('disabled');
and to add disabled attribute use,
$("#elementID").prop("disabled", true);
Enjoy :)

or for us that dont like to use jQ for every little thing:
document.getElementById("submitButtonId").disabled = true;

eric, your code did not seem to work for me when the user enters text then deletes all the text. i created another version if anyone experienced the same problem. here ya go folks:
$('input[type="submit"]').attr('disabled','disabled');
$('input[type="text"]').keyup(function(){
if($('input[type="text"]').val() == ""){
$('input[type="submit"]').attr('disabled','disabled');
}
else{
$('input[type="submit"]').removeAttr('disabled');
}
})

It will work like this:
$('input[type="email"]').keyup(function() {
if ($(this).val() != '') {
$(':button[type="submit"]').prop('disabled', false);
} else {
$(':button[type="submit"]').prop('disabled', true);
}
});
Make sure there is an 'disabled' attribute in your HTML

We can simply have if & else .if suppose your input is empty we can have
if($(#name).val() != '') {
$('input[type="submit"]').attr('disabled' , false);
}
else we can change false into true

you can also use something like this :
$(document).ready(function() {
$('input[type="submit"]').attr('disabled', true);
$('input[type="text"]').on('keyup',function() {
if($(this).val() != '') {
$('input[type="submit"]').attr('disabled' , false);
}else{
$('input[type="submit"]').attr('disabled' , true);
}
});
});
here is Live example

For form login:
<form method="post" action="/login">
<input type="text" id="email" name="email" size="35" maxlength="40" placeholder="Email" />
<input type="password" id="password" name="password" size="15" maxlength="20" placeholder="Password"/>
<input type="submit" id="send" value="Send">
</form>
Javascript:
$(document).ready(function() {
$('#send').prop('disabled', true);
$('#email, #password').keyup(function(){
if ($('#password').val() != '' && $('#email').val() != '')
{
$('#send').prop('disabled', false);
}
else
{
$('#send').prop('disabled', true);
}
});
});

Here's the solution for file input field.
To disable a submit button for file field when a file is not chosen, then enable after the user chooses a file to upload:
$(document).ready(function(){
$("#submitButtonId").attr("disabled", "disabled");
$("#fileFieldId").change(function(){
$("#submitButtonId").removeAttr("disabled");
});
});
Html:
<%= form_tag your_method_path, :multipart => true do %><%= file_field_tag :file, :accept => "text/csv", :id => "fileFieldId" %><%= submit_tag "Upload", :id => "submitButtonId" %><% end %>

If the button is itself a jQuery styled button (with .button()) you will need to refresh the state of the button so that the correct classes are added / removed once you have removed/added the disabled attribute.
$( ".selector" ).button( "refresh" );

The answers above don't address also checking for menu based cut/paste events. Below's the code that I use to do both. Note the action actually happens with a timeout because the cut and past events actually fire before the change happened, so timeout gives a little time for that to happen.
$( ".your-input-item" ).bind('keyup cut paste',function() {
var ctl = $(this);
setTimeout(function() {
$('.your-submit-button').prop( 'disabled', $(ctl).val() == '');
}, 100);
});

Disable: $('input[type="submit"]').prop('disabled', true);
Enable: $('input[type="submit"]').removeAttr('disabled');
The above enable code is more accurate than:
$('input[type="submit"]').removeAttr('disabled');
You can use both methods.

Vanilla JS Solution. It works for a whole form not only one input.
In question selected JavaScript tag.
HTML Form:
var form = document.querySelector('form')
var inputs = form.querySelectorAll('input')
var required_inputs = form.querySelectorAll('input[required]')
var register = document.querySelector('input[type="submit"]')
form.addEventListener('keyup', function(e) {
var disabled = false
inputs.forEach(function(input, index) {
if (input.value === '' || !input.value.replace(/\s/g, '').length) {
disabled = true
}
})
if (disabled) {
register.setAttribute('disabled', 'disabled')
} else {
register.removeAttribute('disabled')
}
})
<form action="/signup">
<div>
<label for="username">User Name</label>
<input type="text" name="username" required/>
</div>
<div>
<label for="password">Password</label>
<input type="password" name="password" />
</div>
<div>
<label for="r_password">Retype Password</label>
<input type="password" name="r_password" />
</div>
<div>
<label for="email">Email</label>
<input type="text" name="email" />
</div>
<input type="submit" value="Signup" disabled="disabled" />
</form>
Some explanation:
In this code we add keyup event on html form and on every keypress check all input fields. If at least one input field we have are empty or contains only space characters then we assign the true value to disabled variable and disable submit button.
If you need to disable submit button until all required input fields are filled in - replace:
inputs.forEach(function(input, index) {
with:
required_inputs.forEach(function(input, index) {
where required_inputs is already declared array containing only required input fields.

I had to work a bit to make this fit my use case.
I have a form where all fields must have a value before submitting.
Here's what I did:
$(document).ready(function() {
$('#form_id button[type="submit"]').prop('disabled', true);
$('#form_id input, #form_id select').keyup(function() {
var disable = false;
$('#form_id input, #form_id select').each(function() {
if($(this).val() == '') { disable = true };
});
$('#form_id button[type="submit"]').prop('disabled', disable);
});
});
Thanks to everyone for their answers here.

Please see the below code to enable or disable Submit button
If Name and City fields has value then only Submit button will be enabled.
<script>
$(document).ready(function() {
$(':input[type="submit"]').prop('disabled', true);
$('#Name').keyup(function() {
ToggleButton();
});
$('#City').keyup(function() {
ToggleButton();
});
});
function ToggleButton() {
if (($('#Name').val() != '') && ($('#City').val() != '')) {
$(':input[type="submit"]').prop('disabled', false);
return true;
} else {
$(':input[type="submit"]').prop('disabled', true);
return false;
}
} </script>
<form method="post">
<div class="row">
<div class="col-md-4">
<h2>Getting started</h2>
<fieldset>
<label class="control-label text-danger">Name</label>
<input type="text" id="Name" name="Name" class="form-control" />
<label class="control-label">Address</label>
<input type="text" id="Address" name="Address" class="form-control" />
<label class="control-label text-danger">City</label>
<input type="text" id="City" name="City" class="form-control" />
<label class="control-label">Pin</label>
<input type="text" id="Pin" name="Pin" class="form-control" />
<input type="submit" value="send" class="btn btn-success" />
</fieldset>
</div>
</div>
</form>

take look at this snippet from my project
$("input[type="submit"]", "#letter-form").on("click",
function(e) {
e.preventDefault();
$.post($("#letter-form").attr('action'), $("#letter-form").serialize(),
function(response) {// your response from form submit
if (response.result === 'Redirect') {
window.location = response.url;
} else {
Message(response.saveChangesResult, response.operation, response.data);
}
});
$(this).attr('disabled', 'disabled'); //this is what you want
so just disabled the button after your operation executed
$(this).attr('disabled', 'disabled');

Al types of solution are supplied. So I want to try for a different solution. Simply it will be more easy if you add a id attribute in your input fields.
<input type="text" name="textField" id="textField"/>
<input type="submit" value="send" id="submitYesNo"/>
Now here is your jQuery
$("#textField").change(function(){
if($("#textField").val()=="")
$("#submitYesNo").prop('disabled', true)
else
$("#submitYesNo").prop('disabled', false)
});

Try
let check = inp=> inp.nextElementSibling.disabled = !inp.value;
<input type="text" name="textField" oninput="check(this)"/>
<input type="submit" value="send" disabled />

I Hope below code will help someone ..!!! :)
jQuery(document).ready(function(){
jQuery("input[type=submit]").prop('disabled', true);
jQuery("input[name=textField]").focusin(function(){
jQuery("input[type=submit]").prop('disabled', false);
});
jQuery("input[name=textField]").focusout(function(){
var checkvalue = jQuery(this).val();
if(checkvalue!=""){
jQuery("input[type=submit]").prop('disabled', false);
}
else{
jQuery("input[type=submit]").prop('disabled', true);
}
});
}); /*DOC END*/

Categories

Resources