How to determine which button is pressed on iOS devices using Javascript?

How to determine which button is pressed on iOS devices using Javascript? - javascript

I am intercepting form submissions so that I can reroute them in my single page app (I'm not using a framework, just plain Javascript). Some of my code has multiple buttons with the same name. The following code works on Chrome/Desktop, but does not work on iOS. Specifically, in the following sample code, using document.activeElement doesn't work on iOS. How can I determine which button was pressed on iOS so that I only pass the correct button name/value?
Ideally, the solution would not involve modifying the existing form (other than the 'submit' event listener).
<html>
<body>
<span id="app">
<form method="POST" action="/test">
<input type="hidden" name="id" value="123">
<input name="email" id="email" class="form-control" type="text">
<button name="action" value="one">One</button>
<button name="action" value="two">Two</button>
<button name="action" value="three">Three</button>
<button name="action" value="four">Four</button>
</form>
</span>
<script>
document.getElementById("app").addEventListener("submit", myfunc);
function myfunc(e) {
e.preventDefault()
let action = e.target.getAttribute("action");
console.log("action:", action);
let ae = document.activeElement;
console.log("ae:", ae);
// On iOS btnname and btnval are null. They should be the name
// and value of the button that did the form submittion.
let btnname = ae.getAttribute('name');
let btnval = ae.getAttribute('value');
console.log("btnname:", btnname);
console.log("btnval:", btnval);
let elements = e.target.elements;
for (i=0; i<elements.length; i++) {
let ele = elements[i];
if (ele.type == "submit") {
if (btnval == undefined) {
console.log("skipping:", ele.value)
continue;
}
if (ele.name == btnname) {
if (ele.value != btnval || btnval == undefined) {
console.log("skipping:", ele.value)
continue;
}
console.log("found pressed button: ", btnval)
}
}
console.log("submitting: ", ele.name)
console.log("submitting: ", ele.value)
}
}
</script>
</body>

The solution I came up with involves adding a click event handler. click handlers always fire before submit event handlers. With the click event handler, I record the name and value of the button that was clicked. Then, I can use those in the submit handler, ignoring all elements of type submit. Here is sample code, that also handles check boxes and radio buttons.
<!DOCTYPE html>
<html lang="en-US">
<body>
<span id="app">
<form method="POST" action="/test">
<input type="hidden" name="id" value="123">
<input name="email" id="email" class="form-control" type="text">
<button name="action" value="one">One</button>
<button name="action" value="two">Two</button>
<button name="action" value="three">Three</button>
<button name="action" value="four">Four</button>
<input type="checkbox" name="check1" value="checkvalue1">
<input type="checkbox" name="check2" value="checkvalue2" checked>
<input type="radio" name="radio" value="radio1">
<input type="radio" name="radio" value="radio2" checked>
<input type="radio" name="radio" value="radio3">
click me!
</form>
</span>
<script>
var submitName;
var submitValue;
// click events fire before submit events
document.getElementById("app").addEventListener("submit", myfunc);
document.getElementById("app").addEventListener("click", setSubmit);
function myfunc(e) {
e.preventDefault()
let action = e.target.getAttribute("action");
console.log("action:", action);
let elements = e.target.elements;
if (submitName != "") {
console.log("submitting: ", submitName)
console.log("submitting: ", submitValue)
}
for (i=0; i<elements.length; i++) {
let ele = elements[i];
if (ele.type == "submit") {
} else if (ele.type == "checkbox" || ele.type == "radio") {
if (ele.checked == false) {
continue
}
}
console.log("submitting: ", ele.name)
console.log("submitting: ", ele.value)
}
}
function setSubmit(e)
{
console.log("type:", e.target.type);
if (e.target.type != "submit") {
return;
}
// record the name/value of the button that was pressed
submitName = e.target.name;
submitValue = e.target.value;
}
</script>
</body>

Related

disable and enabling a html button

Users will only be able to click the submit button if users select a video file and the textbox is not empty. i can disable the submit button but i cant re-enable it
<form action="upload.php" method="post" enctype="multipart/form-data">
<label for="file"><span></span></label>
<input type="file" name="videofile" id="videofile" />
<br/>
Please enter video title:
<br/>
<input type"text" name="videoTitle" />
<br />
<input type="button" disabled id="Submit" value="Submit" onclick="submit()"/>
</form>
<script>
document.getElementById('submit').disabled = true;
var n=document.getElementById('videoTitle').value;
function submit();
if($('#videofile')[0].files.length != 0) && (n.length > 1)
{
document.getElementById('submit').disabled = false;
}
</script>

Your code had a lot of mistakes. This is your corrected code:
function check() {
if (document.querySelector('#videofile').files.length != 0 && (document.getElementById("videoTitle").value.length > 1)) {
document.getElementById('Submit').disabled = false;
} else {
document.getElementById('Submit').disabled = true;
}
}
Here is the JSFiddle demo
Missing ID added (u added only name attribute, and forgot the ID while still trying to use them)
Changed 'submit' in code to 'Submit'
Remove JQuery $ syntax
Validation on keypress rather than on submit click (which doesn't makes sense since u cant click the button while its disabled)
Else code added to re-disable the button if conditions are not valid

onclick event over submit button does not make sense here. You must listen change event of the file input and keyup event of the text input and apply conditions accordingly. You have not assigned id attribute as well(videoTitle)
Also note that click handler will not be invoked if the button is disabled
Try this:
var submitBtn = document.getElementById('Submit');
function enableDisable() {
var elem = document.getElementById('videofile');
var n = document.getElementById('videoTitle').value;
if (elem.files.length && n) {
submitBtn.disabled = false;
} else {
submitBtn.disabled = true;
}
}
<form action="upload.php" method="post" enctype="multipart/form-data">
<label for="file"><span></span></label>
<input type="file" name="videofile" id="videofile" onchange='enableDisable()' />
<br/> Please enter video title:
<br/>
<input type="text" name="videoTitle" id='videoTitle' onkeyup='enableDisable()' />
<br />
<input type="button" disabled id="Submit" value="Submit" />
</form>

Can you try to make your submit function do something?
function submit() {
if($('#videofile')[0].files.length != 0) && (n.length > 1) {
document.getElementById('submit').disabled = false;
}
};

you should use change event for text and videofile elements. So that whenever you modify something, change event is triggered and ur condition is checked inside it. Submit button is enable according to it.
Se the below code for reference!
<form action="upload.php" method="post" enctype="multipart/form-data">
<label for="file"><span></span></label>
<input type="file" name="videofile" id="videofile" />
<br/>
Please enter video title:
<br/>
<input type"text" name="videoTitle" id="videoText"/>
<br />
<input type="button" disabled id="Submit" value="Submit" onclick="submit()"/>
</form>
<script>
document.getElementById('submit').disabled = true;
var n=document.getElementById('videoTitle').value;
function submit();
$('#videofile').change(function() {
if($('#videofile')[0].files.length != 0) && (n.length > 1) {
document.getElementById('submit').disabled = false;
} else {
document.getElementById('submit').disabled = true;
}
});
$('#videoText').change(function() {
if($('#videofile')[0].files.length != 0) && (n.length > 1) {
document.getElementById('submit').disabled = false;
} else {
document.getElementById('submit').disabled = true;
}
});
</script>

I feel this is a bit simpler way to achieve this
<script>
document.getElementById("submit").style.pointerEvents = "none"; //Disable
var n=document.getElementById('videoTitle').value;
function submit();
if($('#videofile')[0].files.length != 0) && (n.length > 1)
{
document.getElementById("submit").style.pointerEvents = "all"; //Enable
}
</script>
Just replace your script with this one & try..
Hope this works for you..

Force user to fill all fields before enabling form submit

I have a form containing various fields.
See jsFiddle demo.
My aim is to enable the submit button only when the user has filled in all fields.
So far, I'm able to force the title field to have content before submit button is enabled. How do I make it so that all other fields need to be filled too before submit button is enabled.
jQuery("input[type='text']").on("keyup", function () {
if (jQuery(this).val() != "" ) {
if (jQuery("#titlenewtide").val() != '')
{
jQuery("#subnewtide").removeAttr("disabled");
}
} else {
jQuery("#subnewtide").attr("disabled", "disabled");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="#" method="post" id="new_tide">
Title: <input id="titlenewtide" type="text" name="title" required> <br>
Description: <textarea name="description" id="description"></textarea> <br>
Tag: <input id="newtag" type="text" name="newtag" required> <br>
Category: <input type="radio" name="category" value="19" required> Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>
Note that I am loading the JavaScripts in my footer.

Make the changes take effect after changing inputs values:
On each input change, test the values of other inputs and checked state of radio, if all inputs has been entered it will make the submit button enabled:
var validateInputs = function validateInputs(inputs) {
var validForm = true;
inputs.each(function(index) {
var input = $(this);
if (!input.val() || (input.type === "radio" && !input.is(':checked'))) {
$("#subnewtide").attr("disabled", "disabled");
validForm = false;
}
});
return validForm;
}
inputs.change(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
Demo:
var inputs = $("form#myForm input, form#myForm textarea");
var validateInputs = function validateInputs(inputs) {
var validForm = true;
inputs.each(function(index) {
var input = $(this);
if (!input.val() || (input.type === "radio" && !input.is(':checked'))) {
$("#subnewtide").attr("disabled", "disabled");
validForm = false;
}
});
return validForm;
}
inputs.change(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="#" method="post" id="myForm">
Title:
<input id="titlenewtide" type="text" name="title" required>
<br>Description:
<textarea name="description" id="description"></textarea>
<br>Tag:
<input id="newtag" type="text" name="newtag" required>
<br>Category:
<input type="radio" name="category" value="19" required>Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>
Also it uses the form id="myForm", so you can use it to validate only specific forms in your pages.
Note: This is tested and working on Chrome, Firefox and IE.
EDIT:
Make the changes take effect when we type in the inputs:
In the previous code we are using onchange event handler to call the function so it's only called when we click outside a given input (after change).
To perform the call automatically when the user enters a character in a field (the last one) we need to use the onkeyup event so we don't need to click outside of it.
This is the changed code you need :
var inputs = $("form#myForm input, form#myForm textarea");
var validateInputs = function validateInputs(inputs) {
var validForm = true;
inputs.each(function(index) {
var input = $(this);
if (!input.val() || (input.type === "radio" && !input.is(':checked'))) {
$("#subnewtide").attr("disabled", "disabled");
validForm = false;
}
});
return validForm;
}
inputs.each(function() {
var input = $(this);
if (input.type === "radio") {
input.change(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
} else {
input.keyup(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="#" method="post" id="myForm">
Title:
<input id="titlenewtide" type="text" name="title" required>
<br>Description:
<textarea name="description" id="description"></textarea>
<br>Tag:
<input id="newtag" type="text" name="newtag" required>
<br>Category:
<input type="radio" name="category" value="19" required>Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>

Use this code below. On each input, it will check all the form fields by using this function validate().
jQuery("input[type='text'], textarea").on("input", function () {
var isValid = validate();
if (isValid) {
jQuery("#subnewtide").removeAttr("disabled");
} else {
jQuery("#subnewtide").attr("disabled", "disabled");
}
});
function validate() {
var isValid = true;
$('input, textarea').each(function() {
if ($(this).val() === '')
isValid = false;
});
return isValid;
}
Fiddle
Update
To make it validate if the form has id="new_tide" and fix about the radio button.
$("input[type='text'], textarea").on("change input", function() {
validate($(this));
});
$("input:radio[name='category']").on("change", function() {
validate($(this));
});
function validate(self) {
if (self.parents("form:first").attr("id") == "new_tide") {
var isValid = true;
$('input[type="text"], textarea').each(function() {
if ($(this).val() === '')
isValid = false;
});
if (!$("input:radio[name='category']").is(':checked'))
isValid = false;
if (isValid) {
$("#subnewtide").removeAttr("disabled");
} else {
$("#subnewtide").attr("disabled", "disabled");
}
}
}
Fiddle

Here's how you can do it:
$(document).ready(function () {
var $inputs = $("#new_tide input:not([type=hidden]), #new_tide textarea");
$inputs.on("input change", function () {
valid = true;
$inputs.each(function () {
valid *= this.type == "radio" ? this.checked : this.value != "";
return valid;
});
$("#subnewtide").prop("disabled", !valid);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<form action="#" method="post" id="new_tide">
Title: <input id="titlenewtide" type="text" name="title" required> <br>
Description: <textarea name="description" id="description"></textarea> <br>
Tag: <input id="newtag" type="text" name="newtag" required> <br>
Category: <input type="radio" name="category" value="19" required> Animation
Hidden: <input type="hidden">
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>

Try utilizing .siblings() , .map() to compile values of form elements , Array.prototype.every() to return Boolean representation of input , textarea values , set disabled property of form input[type=submit] element
$("form *[required]").on("input change", function(e) {
$(this).siblings("[type=submit]").prop("disabled"
, !$(this).siblings(":not([type=submit])").add(this).map(function(_, el) {
return el.type === "radio" ? el.checked : el.value
}).get().every(Boolean)
);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<form action="#" method="post" id="new_tide">
Title: <input id="titlenewtide" type="text" name="title" required> <br>
Description: <textarea name="description" id="description" required></textarea> <br>
Tag: <input id="newtag" type="text" name="newtag" required> <br>
Category: <input type="radio" name="category" value="19" required> Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>

By far the easiest, would be to rely on the HTML5 validation you're already using.
You'd have to add required to all form controls if you want to require all of them, and that can easily be done by using jQuery's :input selector and setting the property, like so
$(':input:not(#subnewtide)').prop('required', true)
We'll exclude the submit button, as that doesn't have to be required, obviously, not that it would matter in this case.
Then we'll listen for the input event, which covers all sorts of inputs, like typing, pasting etc, and the change event as well to cover the radio button.
Using form.checkValidity() tells us if the form is valid, and returns a boolean, so we could use it directly to set the disabled property of the submit button.
All together it looks like this, and that's all you need, a few lines of really simple code
$(':input:not(#subnewtide)').prop('required', true).on('input change', function() {
$('#subnewtide').prop( 'disabled', !this.form.checkValidity() );
});
FIDDLE
If you have to support old browsers that don't have HTML5 validation, you can use the H5F polyfill

My solution is base on standard JavaScript.
HTML form
<form action="#" method="post" id="new_tide" name="form1">
Title: <input onkeyup="myBtnActivator(1)" id="titlenewtide" name="title" type="text" required> <br>
Description: <textarea onkeyup="myBtnActivator(2)" id="description" name="description"></textarea> <br>
Tag: <input id="newtag" onkeyup="myBtnActivator(3)" name="newtag" type="text" required> <br>
Category: <input name="category" onchange="myBtnActivator(4)" type="radio" value="19" required> Animation
<button id="subnewtide" name="subnewtide" type="submit" value="Submit">Submit</button>
</form>
JavaScript
<script>
document.getElementById("subnewtide").disabled = true;
var input1 = false;
var input2 = false;
var input3 = false;
var input4 = false;
function myBtnActivator(i) {
switch (i) {
case 1:
input1 = true;
if (document.form1.title.value == "")
input1 = false;
break;
case 2:
input2 = true;
if (document.form1.description.value == "")
input2 = false;
break;
case 3:
input3 = true;
if (document.form1.newtag.value == "")
input3 = false;
break;
case 4:
input4 = true;
if (document.form1.subnewtide.value == "")
input4 = false;
break;
}
trigger();
}
function trigger() {
if (input1 == true && input2 == true && input3 == true && input4 == true) {
document.getElementById("subnewtide").disabled = false;
} else {
document.getElementById("subnewtide").disabled = true;
}
}
</script>

Why don't you use jquery validate . It's a good plugin .
The logic works like, any change in the form it will check the form is valid or not. And also using the errorplacement function it will disable the default error message also.
$().ready(function() {
// validate signup form on keyup and submit
$("#contactForm").validate({
rules: {
title: "required",
description: {
required: true
},
newtag: {
required: true
},
category: {
required: true
}
},
errorPlacement: function(error, element) {
return true;
},
submitHandler: function() {
}
});
$('#contactForm').change(function() {
if ($("#contactForm").valid()) {
$("#subnewtide").removeAttr("disabled");
}
});
});
Fiddle

There's actually a pretty easy approach. I'm using native JavaScript, but I think it is applicable in jQuery as well:
var form = document.getElementById("new_tide");
form.onchange = function onChange() {
var enable = true;
var inputs = form.getElementsByTagName("input");
var textareas = form.getElementsByTagName("textarea");
for (var i in inputs) {
enable = enable && inputs[i].value != "";
}
for (var i in textareas) {
enable = enable && textareas[i].value != "";
}
enable = enable && textarea.value != "";
document.getElementById("subnewtide").disabled = !enable;
}
The change event on form is always called, when any input or textarea element was changed (click in element, type, click somewhere else or lose focus).
Edit:
Regarding hidden fields, you can exclude them by surrounding the enable calculation with an if-condition:
if (!inputs[i].hidden) {
enable = enable && inputs[i].value != "";
}
Note:
This will work in any browser (even Internet Explorer 5.5). Check on MDN:
for ..in Loop
element.getElementsByTagName()
document.getElementById()

Thought I might chip in. Assuming as little as possible.
jQuery("input, textarea").on("keyup click", function () { // going vanilla after easy-mode attach
var sub = document.getElementById('subnewtide');
if (require_all(find_form(this))) {
sub.removeAttribute('disabled');
sub.disabled = false;
} else {
sub.setAttribute('disabled', 'disabled');
sub.disabled = true;
}
});
function concat(a, b) { // concating Array-likes produces Array
var slice = [].slice; // not assuming Array.prototype access
return [].concat.call(
slice.call(a, 0),
slice.call(b, 0)
);
}
function find_form(e) { // shim input.form
if (e) do {
if (e.tagName === 'FORM') return e;
} while (e = e.parentNode);
return null;
}
function require_all(form, dontIgnoreHidden) { // looks at textareas & inputs (excluding buttons)
var inp = concat(form.getElementsByTagName('input'), form.getElementsByTagName('textarea')),
rad = {}, // not assuming Object.create
i, j,
has = {}.hasOwnProperty; // not assuming Object.prototype access
for (i = 0; i < inp.length; ++i) {
switch ((inp[i].type || '').toLowerCase()) {
default: // treat unknown like texts
case 'text':
if (!inp[i].value) return false; break;
case 'checkbox':
if (!inp[i].checked) return false; break;
case 'radio':
j = inp[i].getAttribute('name');
if (!rad[j]) rad[j] = inp[i].checked;
break;
case 'hidden':
if (dontIgnoreHidden && !inp[i].value) return false; break;
case 'button':
case 'submit':
break;
}
}
for (j in rad) if (!has || has.call(rad, j)) // not assuming hasOwnProperty
if (!rad[j]) return false;
return true;
}

Here is a quick way to accomplish that. It involves attaching a change event listener to :radio and :checkbox elements and an input event listener to other elements. These can both use a common predefined handler that will count the number of unfilled element each time each of these events fires on the appropriate element.
function checkForm() {
//define and initialize variables
var unfilled = 0,
form = $(this.form);
//disable submit button if enabled
$(':submit', form).prop('disabled', true);
//count number of unfilled elements
$(':input', form).each(function() {
if( $(this).is(':radio,:checkbox') ) {
$('input[name=' + this.name + ']:checked').length || unfilled++;
} else {
$('[name=' + this.name + ']').val() || unfilled++;
}
});
//enable submit button if no unfilled element is found
unfilled || $(':submit', form).prop('disabled', false);
}
//set up event listeners to fire above handler
$(':text,textarea,select').on('input', checkForm);
$(':radio,:checkbox').on('change', checkForm);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<form action="#" method="post" id="new_tide">
Title: <input id="titlenewtide" type="text" name="title" required> <br>
Description: <textarea name="description" id="description"></textarea> <br>
Tag: <input id="newtag" type="text" name="newtag" required> <br>
Category: <input type="radio" name="category" value="19" required> Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>

var inputs = $("form#myForm input, form#myForm textarea");
var validateInputs = function validateInputs(inputs) {
var validForm = true;
inputs.each(function(index) {
var input = $(this);
if (!input.val() || (input.type === "radio" && !input.is(':checked'))) {
$("#subnewtide").attr("disabled", "disabled");
validForm = false;
}
});
return validForm;
}
inputs.each(function() {
var input = $(this);
if (input.type === "radio") {
input.change(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
} else {
input.keyup(function() {
if (validateInputs(inputs)) {
$("#subnewtide").removeAttr("disabled");
}
});
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="#" method="post" id="myForm">
Title:
<input id="titlenewtide" type="text" name="title" required>
<br>Description:
<textarea name="description" id="description"></textarea>
<br>Tag:
<input id="newtag" type="text" name="newtag" required>
<br>Category:
<input type="radio" name="category" value="19" required>Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>

Use this html<br>
HTML:
<br>
<pre>
<form action="#" method="post" id="">
Title: ##<input id="titlenewtide" type="text" name="title" required>
Description: <textarea name="description" id="description"></textarea>
Tag: <input id="newtag" type="text" name="newtag" required>
Category: <input type="checkbox" onclick="validate()" name="category" id="cate"value="19" required > Animation
<button type="submit" value="Submit" name="subnewtide" id="subnewtide" disabled="disabled">Submit</button>
</form>
</pre>
validation code:<br>
//on each key up function intiate the function validate
<pre>
jQuery("input[type='text']").on("keyup", function () {
validate();
});
jQuery("#description").on("keyup", function () {
validate();
});
function validate(){
jQuery("input[type='text']").each(function(){
if (jQuery(this).val() != "" )
{
if((jQuery("#description").val() !="") && (jQuery("#cate").is(':checked')))
{
jQuery("#subnewtide").removeAttr("disabled");
}
else {
jQuery("#subnewtide").attr("disabled", "disabled");
}
}
});
}
</pre>
you can find the fiddle in : https://jsfiddle.net/s8uv2gkp/

Maytham Fahmi's relatively easy solution can be made even easier by passing this.name.
<form action="#" method="post" id="new_tide" name="form1">
<input onkeyup="myBtnActivator(this.name)" name="title" type="text" required> <br>
<textarea onkeyup="myBtnActivator(this.name)" name="description"></textarea> <br>
<input id="newtag" onkeyup="myBtnActivator(this.name)" name="newtag" type="text" required> <br>
<input name="category" onchange="myBtnActivator(this.name)" type="radio" value="19" required> Animation
<button id="subnewtide" name="subnewtide" type="submit" value="Submit">Submit</button>
</form>
this refers to the DOM object that called the function. So the switch can just directly take the name, or the value, or anything else you can pass with DOM.
myBtnActivator(n)
{
switch(n)
{
case "title":
break;
case "description":
break;
case "newtag":
break;
case "category":
break;
}
}

Pass jQuery array value on submit as hidden input

On button press the following code will display a message with values collected from all checkboxes. But I want to pass these values (returned by function) as hidden input on submit.
<form action="script.php" method="post">
<input type="checkbox" name="chb1" value="html" />HTML<br/>
<input type="checkbox" name="chb2" value="css" />CSS<br/>
<input type="checkbox" name="chb3" value="javascript" />JavaScript<br/>
<input type="checkbox" name="chb4" value="php" />php<br/>
<input type="checkbox" name="chb5" value="python" />Python<br/>
<input type="checkbox" name="chb6" value="net" />Net<br/>
<input type="button" value="Click" id="btntest" />
</form>
<script type="text/javascript"><!--
function getSelectedChbox(frm) {
var selchbox = [];
var inpfields = frm.getElementsByTagName('input');
var nr_inpfields = inpfields.length;
for(var i=0; i<nr_inpfields; i++) {
if(inpfields[i].type == 'checkbox' && inpfields[i].checked == true) selchbox.push(inpfields[i].value);
}
return selchbox;
}
document.getElementById('btntest').onclick = function(){
var selchb = getSelectedChbox(this.form);
alert(selchb);
}
//-->
</script>

I've seen guys like you trying to code my router interface, so I'll help out.
give your form an id cause you'll need it later
<form action="script.php" method="post" id="the_form">
add the hidden input in the form
<input type="hidden" name="values" id="values" value="" />
the button in the form matures to a real submit (amazing)
<input type="submit" ...
your "getSelectedChbox()" function is amazing; don't change anything there, just wanted to give you congratulations for it, it's a great function
now, where it says document.getElementById('btntest').onclick - get rid of all that and add this code instead; this code will do the rest.
document.getElementById('the_form').onsubmit = function(){
var selchb = getSelectedChbox(this);
var values = selchb.join(', ');
if(!values.length){
alert('There was an error. You have to select some checkboxes. ');
return false;
}
document.getElementById('values').value = values;
if(!confirm(" Are you interested in submitting this form now? If not, click accordingly. "))
return false;
}
Or simply copy-paste this whole thing in a file called script.php:
<?php echo var_dump(isset($_POST['values']) ? $_POST['values'] : 'Submit first.'); ?>
<form action="script.php" method="post" id="the_form">
<input type="checkbox" name="chb1" value="html" />HTML<br/>
<input type="checkbox" name="chb2" value="css" />CSS<br/>
<input type="checkbox" name="chb3" value="javascript" />JavaScript<br/>
<input type="checkbox" name="chb4" value="php" />php<br/>
<input type="checkbox" name="chb5" value="python" />Python<br/>
<input type="checkbox" name="chb6" value="net" />Net<br/>
<input type="hidden" name="values" id="values" value="" />
<input type="submit" value="Click" id="btntest" />
</form>
<script type="text/javascript"><!--
function getSelectedChbox(frm) {
var selchbox = [];
var inpfields = frm.getElementsByTagName('input');
var nr_inpfields = inpfields.length;
for(var i=0; i<nr_inpfields; i++) {
if(inpfields[i].type == 'checkbox' && inpfields[i].checked == true)
selchbox.push(inpfields[i].value);
}
return selchbox;
}
document.getElementById('the_form').onsubmit = function(){
var selchb = getSelectedChbox(this);
var values = selchb.join(', ');
if(!values.length){
alert('There was an error. You have to select some checkboxes. ');
return false;
}
document.getElementById('values').value = values;
if(!confirm(" Are you interested in submitting this form now? If not, click accordingly. "))
return false;
}
//-->
</script>
Have fun.

Collect multiple checkbox values without form tag using javascript

I am working on a plugin for MyBB, and there I have to collect values of all checked "checkboxes" every checkbox has diffrent name/ID & unfortunatly these checkboxes are not placed under any form tag so how can I do this ???
Look at code below this code works fine if I place form tag at first row but it doesn't return anything if I place form tag below all checkbox (actually this is exactly how I have to handle checkboxes in MyBB)
Thanks,
<input type="checkbox" name="chb1" value="html" />HTML<br/>
<input type="checkbox" name="chb2" value="css" />CSS<br/>
<input type="checkbox" name="chb3" value="javascript" />JavaScript<br/>
<input type="checkbox" name="chb4" value="php" />php<br/>
<input type="checkbox" name="chb5" value="python" />Python<br/>
<input type="checkbox" name="chb6" value="net" />Net<br/>
<form action="script.php" method="post">
<input type="button" value="Click" id="btntest" />
</form>
<script type="text/javascript"><!--
function getSelectedChbox(frm) {
var selchbox = [];
var inpfields = frm.getElementsByTagName('input');
var nr_inpfields = inpfields.length;
for(var i=0; i<nr_inpfields; i++) {
if(inpfields[i].type == 'checkbox' && inpfields[i].checked == true) selchbox.push(inpfields[i].value);
}
return selchbox;
}
document.getElementById('btntest').onclick = function(){
var selchb = getSelectedChbox(this.form);
alert(selchb);
}
//-->
</script>

>>>Test the Fiddle<<<
Well... with pure JavaScript:
function getCheckboxesValues(){
return [].slice.apply(document.querySelectorAll("input[type=checkbox]"))
.filter(function(c){ return c.checked; })
.map(function(c){ return c.value; });
}
document.getElementById("btntest").addEventListener("click", function(){
console.log(getCheckboxesValues());
});

Checking if all my Radio Buttons are filled

I need to figure out how to check that my radio buttons are all filled. This is what I have but it only checks one button
var btns = form.choice_1;
for (var i=0; el=btns[i]; i++) {
if (el.checked) return true;
}
alert('Please select a radio button');
return false;
This is the form that I am taking input from.
<form onsubmit="return checkRadios(this);" name = "form" action = "like.php" method ="post" >
<h1> Questions </h1>
<p> Question 1 </p>
<input type="radio" name="choice_1" value="1">Like <input type="radio" name="choice_1" value="2" > Dislike
<p> Question 2 </p>
<input type="radio" name="choice_2" value="1">Like <input type="radio" name="choice_2" value="2" > Dislike
<p> Question 3 </p>
<input type="radio" name="choice_3" value="1">Like <input type="radio" name="choice_3" value="2" > Dislike
<p> Question 4 </p>
<input type="radio" name="choice_4" value="1">Like <input type="radio" name="choice_4" value="2" > Dislike
<br> <br>
<input type="submit" value="Submit">
Any help is appreciated.

Try this:
var checkRadios = function () {
var btns = form.querySelectorAll('input[name^=choice_][type="radio"]');
for (var i = 0; i < btns.length; i = i + 2) {
var check = true;
if (!btns[i].checked && !btns[i + 1].checked) check = false;
}
if (!check) alert('Please select a radio button');
return check;
}
var form = document.querySelector('form[name="form"]');
form.onsubmit = checkRadios;
Fiddle

You should use jQuery for this. It makes it much easier.
You would do it like this:
var e = ('#[[[[id of your radio]]]]');
if($e.is(':checked'){
//do what you need to
};

Try this. You will need jQuery.
checkRadios = function() {
if $("input:radio :checked").length == 0 {
alert('Please select a radio button');
return false;
}
}

Develop Reference

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Pass jQuery array value on submit as hidden input

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