Submit form only if at least one checkbox is checked

Submit form only if at least one checkbox is checked - javascript

i'm triyng to validate a form.
In this form you've to choose at least one element by checkboxes, and I can't be sure about their quantity (it depends by elements number).
I need to enable the submit input if one or more checkboxes are checked, and disable it if there aren't any checkbox checked, how can I do?
Here's my code:
<form id="booking">
<input type="checkbox" name="room1" class="roomselect"/>
<input type="checkbox" name="room2" class="roomselect"/>
<input type="checkbox" name="room3" class="roomselect"/>
<input type="submit" value="Request" id="subm" />
</form>

//dom ready handler
jQuery(function ($) {
//form submit handler
$('#booking').submit(function (e) {
//check atleat 1 checkbox is checked
if (!$('.roomselect').is(':checked')) {
//prevent the default form submit if it is not checked
e.preventDefault();
}
})
})

You can use :checked selector along with .length to find checked checkbox count:
var len = $(".roomselect:checked").length;
if(len>0){
//more than one checkbox is checked
}
Demo

The :checked selector will Match all elements that are checked or selected.
You could try this
$("#subm").click(function(e){
if($(".roomselect:checked").length == 0){
e.preventDefault();
}
});

i suggest you to use "button" instead of "submit".
please follow this
HTML->
<form id="booking" action="https://www.google.co.in/search">
<input type="checkbox" value="facebook" name="q"/>
<input type="checkbox" value="gmail" name="q"/>
<input type="checkbox" value="stackoverflow" name="q"/>
<input type="button" value="Request" id="submit" />
$(function(){
$("#submit").click(function(e){
var number_of_checked_checkbox= $("input[name=q]:checked").length;
if(number_of_checked_checkbox==0){
alert("select any one");
}else{
$("#booking").submit();
}
});
});

Vanilla JavaScript equivalent of the jQuery way, using document.querySelector
if (document.querySelector('.roomselect:checked')) {
// somethings checked
}
Demo

The easiest method would be with javascript, fortunately someone's already done all the work here (with jQuery). All you'd need to do to adapt that example is to change #form_check to #booking.
Essentially what that example is doing is forcing itself before the submit action when it sees one is being tried for the form then it's searching inside the form element for any checkbox elements with a checked state and if it can't find any is sending a preventdefault to stop whatever the client/browser's default response to a submit action request would be or otherwise just sending as normal.
Also regarding the other answers, using === is more secure and returning false gives you some redundancy. Here's some discussion on what the return false adds.
Additionally don't use click() for this as you potentially run into use cases where you're technically submitting the form but aren't actually clicking it, like say when you hit enter

try this
var checked = false;
$(function(){
$('#subm').click(function(e){
checkall();
if(!checked){
e.preventDefault();
}
});
$('.roomselect').change(function(e){
checkall();
});
checkall();
});
function checkall()
{
checked = $('.roomselect:checked').length > 0;
$('#subm').prop('disabled',!checked);
}

$("#form_id").submit(function(e) {
var totalChecked = $('#div_id:input[type="checkbox"]:checked').length;
if(totalChecked < 1)
{
alert('Please select at least one checkbox before submit');
return false;
}
});

Related

I have two checkboxes that need to be checked before the form may be submitted

<input type="checkbox" value="On" name="policy" id="policy"></font>
<b><font face="Verdana" color="#ff0000" size="1">*</font></b>By checking the box, you are verifying with your digital signature that you have read and agree to all terms and conditions of the FEG agent agreement.
</td>
</tr>
<tr class="gr">
<td class="rowdot_lno">Do you agree?:</td>
<td class="rowdot_lno">
<input type="checkbox" value="On" name="iagree" id="iagree">
<b><font face="Verdana" color="#ff0000" size="1">*</font></b>I understand that I will be charged $24.95.
</td>
</tr>
I have a <form method="post" action="enroller.dhtml" name="mainform" onSubmit="update_prices()"> and a button <input type="submit" value="Continue">
I've tried a few things but to no avail. The form can be submitted without the checkboxes being checked. Here's the latest bit of jQuery I've tried.
$('input[type=checkbox]').each(function () {
if($(this).is(':checked')) {
return true;
}
});
alert("Please select at least one to upgrade.");
return false;
});
Also I found this on fiddle but it's not really working.. I tried to customize it to my needs.
http://jsfiddle.net/shryme/D3Ldj/

If you have an onSubmit on your submit button or add it though jquery, call a function which would :
if ($('input[type=checkbox] :checked').length == 0) {
alert("Please select at least one to upgrade.");
return false;
} else { return true; }
I hope this is what you are looking for.

From this line:
Please select at least one to upgrade
It seems that you need at least one checkbox checked. If that is the case, you could do something like this:
$("form").submit(function(){
var length = $("input[type=checkbox]").not(":checked").length;
if (length > 1) {
alert("Please select at least one to upgrade.");
return false;
}
});
Which checks to see how many checkboxes are not checked, determines if that number is less than the required number, and if it is, triggers the error message.
You can also further simplify the length variable if you are comfortable with CSS selectors:
var length = $("input[type=checkbox]:not(:checked)").length;
Here's an example.

I would suggest to do it with some MVVM framework but here's some code to do it with jQuery. I made it so that the submit button is disabled unless both boxes are checked.
Fiddle with 2 checkboxes and a submit button
function areChecked(){
var is_1_checked = $('#check_1').is(':checked');
var is_2_checked = $('#check_2').is(':checked');
return is_1_checked == is_2_checked == true;
}
function enableButton(val){
$('#submit').attr('disabled', false);
}
$('#check_1').on('click', function(){
if (areChecked())
enableButton(false);
});
$('#check_2').on('click', function(){
if (areChecked())
enableButton(false);
});

Unchecking a checkbox unchecks another checkbox

I want my #pass_through_card checkbox to be unchecked if my #ranged_pricing checkbox is unchecked as you should not be able to check #pass_through_card without having checked #ranged_pricing. The #pass_through_card checkbox does not have to be checked if #ranged_pricing is checked though, which is why I just put "Do Nothing." What am I doing wrong?
HTML
<input type="checkbox" id="ranged_pricing"/>
<label for="ranged_pricing">
Ranged Pricing
</label>
<input type="checkbox" id="pass_through_card">
<label for="pass_through_card">
Pass Through Card Association Dues and Assessments
</label>
Javascript
$(document).ready(function() {
if($('#ranged_pricing').prop(':checked')) {
//Do Nothing
} else {
$('#pass_through_card').removeAttr('checked');
}
});

It's should be just "checked", not ":checked", when you call .prop().
if ($('#ranged_pricing').prop('checked')) {
The ":checked" notation is for use in selector syntax. When you include the ":" in the call to .prop(), the result will always be false.

Try,
if($("#ranged_pricing").prop('checked') === true){
//do nothing
} else {
$("#pass_through_card").prop('checked', false);
}
You may want to bind a checked event to the ranged_pricing as well, to disable the pass_through_card element when it is not checked.

JavaScript Radio button selection validates fields?

I need to use javascript so that when the one radio button is selected nothing happens but if the other one is (for example, other address) it will then validate the following fields;
street
suberb
postcode
Whilst I post this, it's probably a similar method, but when I have a checkbox and a textbox how could I make it so that the textbox must not be left empty only if the checkbox is checked...
Thanks everyone!!!! Ask for more details if needed, I'm terrible at explaining things!

/* To check radio validation in Employee Details page */
function editPage()
{
var select=document.frmEmployeeDetails.radSelect;
if (radioValidate(select,"Select an Employee"))
{
window.open("EditEmployee`enter code here`.html","_self");
}
return false;
}
Hope this example helps you friend.

Since they will be checking the radio button when they click on it, you can add an onClick event to one of the radio buttons and not the other.
<input type='radio' id='test' name='test-1' />
<input type='radio' id='test' name='test-2'onClick='Validate();'/>
For the checkbox, when a user checks the box you should set the focus to the text input field. That way if a user moves away from that field (onBlur) you can give them an error/alert to fill in the text.
<input type='checkbox' id='testChkbx' name='testChkbx' onClick=' /*Set the focus to the text box*/'/>
<input type='text' id='testText' name='testText' onBlur='/* Check to make sure the value of the checkbox is not empty. */'/>

I'll assume you might be using jQuery, since you didn't say. If not, then you can still take the concepts and port them to plain old javascript or whatever you're using.
Example markup
<form id="address-form">
<input type="radio" name="validate" id="validate_address" value="yes"> Validate<br>
<input type="radio" name="validate" value="no"> Don't Validate<br>
Street <input name="street"><br>
Suberb <input name="suberb"><br>
Postcode <input name="postcode"><br>
<input type="submit">
</form>
Conditional validation
Either somewhere on your page in a <script> tag or in a javascript file you include, create a submit event that will check the value of the radio input before doing the validation.
$('#address-form').submit(function(event) {
if ($('input[name=validate]:checked').val() === 'yes') {
if (!formValid()) {
event.preventDefault(); // Don't submit the form
}
}
});
// Perform validations
function formValid() {
if ($('input[name=street]').val().length == 0) {
// tell them ...
return false;
}
if ($('input[name=suberb]').val().length == 0) {
// tell them ...
return false;
}
if ($('input[name=postcode]').val().length == 0) {
// tell them ...
return false;
}
return true;
}
That should do the trick!
I created a jsfiddle you can mess with further if you want - http://jsfiddle.net/nilbus/JNnuX/2/
Using a checkbox instead
It's pretty similar to use a checkbox. Instead of this
if ($('input[name=validate]:checked').val() === 'yes') {
just check to see if your checkbox is checked.
if ($('input[name=validate]').attr('checked')) {
http://jsfiddle.net/nilbus/JNnuX/3/

Change/Get check state of CheckBox

I just want to get/change value of CheckBox with JavaScript. Not that I cannot use jQuery for this. I've tried something like this but it won't work.
JavaScript function
function checkAddress()
{
if (checkAddress.checked == true)
{
alert("a");
}
}
HTML
<input type="checkbox" name="checkAddress" onchange="checkAddress()" />

Using onclick instead will work. In theory it may not catch changes made via the keyboard but all browsers do seem to fire the event anyway when checking via keyboard.
You also need to pass the checkbox into the function:
function checkAddress(checkbox)
{
if (checkbox.checked)
{
alert("a");
}
}
HTML
<input type="checkbox" name="checkAddress" onclick="checkAddress(this)" />

You need to retrieve the checkbox before using it.
Give the checkbox an id attribute to retrieve it with document.getElementById(..) and then check its current state.
For example:
function checkAddress()
{
var chkBox = document.getElementById('checkAddress');
if (chkBox.checked)
{
// ..
}
}
And your HTML would then look like this:
<input type="checkbox" id="checkAddress" name="checkAddress" onclick="checkAddress()"/>
(Also changed the onchange to onclick. Doesn't work quite well in IE :).

I know this is a very late reply, but this code is a tad more flexible and should help latecomers like myself.
function copycheck(from,to) {
//retrives variables "from" (original checkbox/element) and "to" (target checkbox) you declare when you call the function on the HTML.
if(document.getElementById(from).checked==true)
//checks status of "from" element. change to whatever validation you prefer.
{
document.getElementById(to).checked=true;
//if validation returns true, checks target checkbox
}
else
{
document.getElementById(to).checked=false;
//if validation returns true, unchecks target checkbox
}
}
HTML being something like
<input type="radio" name="bob" onclick="copycheck('from','to');" />
where "from" and "to" are the respective ids of the elements "from" wich you wish to copy "to".
As is, it would work between checkboxes but you can enter any ID you wish and any condition you desire as long as "to" (being the checkbox to be manipulated) is correctly defined when sending the variables from the html event call.
Notice, as SpYk3HH said, target you want to use is an array by default. Using the "display element information" tool from the web developer toolbar will help you find the full id of the respective checkboxes.
Hope this helps.

You need this:
window.onload = function(){
var elCheckBox=document.getElementById("cbxTodos");
elCheckBox.onchange =function (){
alert("como ves");
}
};

Needs to be:
if (document.forms[0].elements["checkAddress"].checked == true)
Assuming you have one form, otherwise use the form name.
As a side note, don't call the element and the function in the same name it can cause weird conflicts.

<input type="checkbox" name="checkAddress" onclick="if(this.checked){ alert('a'); }" />

I know this is late info, but in jQuery, using .checked is possible and easy!
If your element is something like:
<td>
<input type="radio" name="bob" />
</td>
You can easily get/set checked state as such:
$("td").each(function()
{
$(this).click(function()
{
var thisInput = $(this).find("input[type=radio]");
var checked = thisInput.is(":checked");
thisInput[0].checked = (checked) ? false : true;
}
});
The secret is using the "[0]" array index identifier which is the ELEMENT of your jquery object!
ENJOY!

This is an example of how I use this kind of thing:
HTML :
<input type="checkbox" id="ThisIsTheId" value="X" onchange="ThisIsTheFunction(this.id,this.checked)">
JAVASCRIPT :
function ThisIsTheFunction(temp,temp2) {
if(temp2 == true) {
document.getElementById(temp).style.visibility = "visible";
} else {
document.getElementById(temp).style.visibility = "hidden";
}
}

var val = $("#checkboxId").is(":checked");

Here is a quick implementation with samples:
Checkbox to check all items:
<input id="btnSelectAll" type="checkbox">
Single item (for table row):
<input class="single-item" name="item[]" type="checkbox">
Js code for jQuery:
$(document).on('click', '#btnSelectAll', function(state) {
if ($('#btnSelectAll').is(':checked')) {
$('.single-item').prop('checked', true);
$('.batch-erase').addClass('d-block');
} else {
$('.single-item').prop('checked', false);
$('.batch-erase').removeClass('d-block');
}
});
Batch delete item:
<div class="batch-erase d-none">
<a href="/path/to/delete" class="btn btn-danger btn-sm">
<i class="fe-trash"></i> Delete All
</a>
</div>

This will be useful
$("input[type=checkbox]").change((e)=>{
console.log(e.target.checked);
});

How do I check whether a checkbox is checked in jQuery?

I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery.
For example, if the age checkbox is checked, then I need to show a textbox to enter age, else hide the textbox.
But the following code returns false by default:
if ($('#isAgeSelected').attr('checked')) {
$("#txtAge").show();
} else {
$("#txtAge").hide();
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">
Age is selected
</div>
How do I successfully query the checked property?

How do I successfully query the checked property?
The checked property of a checkbox DOM element will give you the checked state of the element.
Given your existing code, you could therefore do this:
if(document.getElementById('isAgeSelected').checked) {
$("#txtAge").show();
} else {
$("#txtAge").hide();
}
However, there's a much prettier way to do this, using toggle:
$('#isAgeSelected').click(function() {
$("#txtAge").toggle(this.checked);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>

Use jQuery's is() function:
if($("#isAgeSelected").is(':checked'))
$("#txtAge").show(); // checked
else
$("#txtAge").hide(); // unchecked

Using jQuery > 1.6
<input type="checkbox" value="1" name="checkMeOut" id="checkMeOut" checked="checked" />
// traditional attr
$('#checkMeOut').attr('checked'); // "checked"
// new property method
$('#checkMeOut').prop('checked'); // true
Using the new property method:
if($('#checkMeOut').prop('checked')) {
// something when checked
} else {
// something else when not
}

jQuery 1.6+
$('#isAgeSelected').prop('checked')
jQuery 1.5 and below
$('#isAgeSelected').attr('checked')
Any version of jQuery
// Assuming an event handler on a checkbox
if (this.checked)
All credit goes to Xian.

I am using this and this is working absolutely fine:
$("#checkkBoxId").attr("checked") ? alert("Checked") : alert("Unchecked");
Note: If the checkbox is checked it will return true otherwise undefined, so better check for the "TRUE" value.

Use:
<input type="checkbox" name="planned_checked" checked id="planned_checked"> Planned
$("#planned_checked").change(function() {
if($(this).prop('checked')) {
alert("Checked Box Selected");
} else {
alert("Checked Box deselect");
}
});
$("#planned_checked").change(function() {
if($(this).prop('checked')) {
alert("Checked Box Selected");
} else {
alert("Checked Box deselect");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="checkbox" name="planned_checked" checked id="planned_checked"> Planned

Since jQuery 1.6, the behavior of jQuery.attr() has changed and users are encouraged not to use it to retrieve an element's checked state. Instead, you should use jQuery.prop():
$("#txtAge").toggle(
$("#isAgeSelected").prop("checked") // For checked attribute it returns true/false;
// Return value changes with checkbox state
);
Two other possibilities are:
$("#txtAge").get(0).checked
$("#txtAge").is(":checked")

This worked for me:
$get("isAgeSelected ").checked == true
Where isAgeSelected is the id of the control.
Also, #karim79's answer works fine. I am not sure what I missed at the time I tested it.
Note, this is answer uses Microsoft Ajax, not jQuery

If you are using an updated version of jquery, you must go for .prop method to resolve your issue:
$('#isAgeSelected').prop('checked') will return true if checked and false if unchecked. I confirmed it and I came across this issue earlier. $('#isAgeSelected').attr('checked') and $('#isAgeSelected').is('checked') is returning undefined which is not a worthy answer for the situation. So do as given below.
if($('#isAgeSelected').prop('checked')) {
$("#txtAge").show();
} else {
$("#txtAge").hide();
}

Use:
<input type="checkbox" id="abc" value="UDB">UDB
<input type="checkbox" id="abc" value="Prasad">Prasad
$('input#abc').click(function(){
if($(this).is(':checked'))
{
var checkedOne=$(this).val()
alert(checkedOne);
// Do some other action
}
})
This can help if you want that the required action has to be done only when you check the box not at the time you remove the check.

You can try the change event of checkbox to track the :checked state change.
$("#isAgeSelected").on('change', function() {
if ($("#isAgeSelected").is(':checked'))
alert("checked");
else {
alert("unchecked");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected" />
<div id="txtAge" style="display:none">
Age is selected
</div>

Using the Click event handler for the checkbox property is unreliable, as the checked property can change during the execution of the event handler itself!
Ideally, you'd want to put your code into a change event handler such as it is fired every time the value of the check box is changed (independent of how it's done so).
$('#isAgeSelected').bind('change', function () {
if ($(this).is(':checked'))
$("#txtAge").show();
else
$("#txtAge").hide();
});

I ran in to the exact same issue. I have an ASP.NET checkbox
<asp:CheckBox ID="chkBox1" CssClass='cssChkBox1' runat="server" />
In the jQuery code I used the following selector to check if the checkbox was checked or not, and it seems to work like a charm.
if ($("'.cssChkBox1 input[type=checkbox]'").is(':checked'))
{ ... } else { ... }
I'm sure you can also use the ID instead of the CssClass,
if ($("'#cssChkBox1 input[type=checkbox]'").is(':checked'))
{ ... } else { ... }
I hope this helps you.

I believe you could do this:
if ($('#isAgeSelected :checked').size() > 0)
{
$("#txtAge").show();
} else {
$("#txtAge").hide();
}

I decided to post an answer on how to do that exact same thing without jQuery. Just because I'm a rebel.
var ageCheckbox = document.getElementById('isAgeSelected');
var ageInput = document.getElementById('txtAge');
// Just because of IE <333
ageCheckbox.onchange = function() {
// Check if the checkbox is checked, and show/hide the text field.
ageInput.hidden = this.checked ? false : true;
};
First you get both elements by their ID. Then you assign the checkboxe's onchange event a function that checks whether the checkbox got checked and sets the hidden property of the age text field appropriately. In that example using the ternary operator.
Here is a fiddle for you to test it.
Addendum
If cross-browser compatibility is an issue then I propose to set the CSS display property to none and inline.
elem.style.display = this.checked ? 'inline' : 'none';
Slower but cross-browser compatible.

This code will help you
$('#isAgeSelected').click(function(){
console.log(this.checked);
if(this.checked == true) {
$("#txtAge").show();
} else {
$("#txtAge").hide();
}
});

This works for me:
/* isAgeSelected being id for checkbox */
$("#isAgeSelected").click(function(){
$(this).is(':checked') ? $("#txtAge").show() : $("#txtAge").hide();
});

There are many ways to check if a checkbox is checked or not:
Way to check using jQuery
if (elem.checked)
if ($(elem).prop("checked"))
if ($(elem).is(":checked"))
if ($(elem).attr('checked'))
Check example or also document:
http://api.jquery.com/attr/
http://api.jquery.com/prop/

This is some different method to do the same thing:
$(document).ready(function (){
$('#isAgeSelected').click(function() {
// $("#txtAge").toggle(this.checked);
// Using a pure CSS selector
if ($(this.checked)) {
alert('on check 1');
};
// Using jQuery's is() method
if ($(this).is(':checked')) {
alert('on checked 2');
};
// // Using jQuery's filter() method
if ($(this).filter(':checked')) {
alert('on checked 3');
};
});
});
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>

Use this:
if ($('input[name="salary_in.Basic"]:checked').length > 0)
The length is greater than zero if the checkbox is checked.

My way of doing this is:
if ( $("#checkbox:checked").length ) {
alert("checkbox is checked");
} else {
alert("checkbox is not checked");
}

$(selector).attr('checked') !== undefined
This returns true if the input is checked and false if it is not.

You can use:
if(document.getElementById('isAgeSelected').checked)
$("#txtAge").show();
else
$("#txtAge").hide();
if($("#isAgeSelected").is(':checked'))
$("#txtAge").show();
else
$("#txtAge").hide();
Both of them should work.

$(document).ready(function() {
$('#agecheckbox').click(function() {
if($(this).is(":checked"))
{
$('#agetextbox').show();
} else {
$('#agetextbox').hide();
}
});
});

1) If your HTML markup is:
<input type="checkbox" />
attr used:
$(element).attr("checked"); // Will give you undefined as initial value of checkbox is not set
If prop is used:
$(element).prop("checked"); // Will give you false whether or not initial value is set
2) If your HTML markup is:
<input type="checkbox" checked="checked" />// May be like this also checked="true"
attr used:
$(element).attr("checked") // Will return checked whether it is checked="true"
Prop used:
$(element).prop("checked") // Will return true whether checked="checked"

This example is for button.
Try the following:
<input type="button" class="check" id="checkall" value="Check All" /> <input type="button" id="remove" value="Delete" /> <br/>
<input type="checkbox" class="cb-element" value="1" /> Checkbox 1 <br/>
<input type="checkbox" class="cb-element" value="2" /> Checkbox 2 <br/>
<input type="checkbox" class="cb-element" value="3" /> Checkbox 3 <br/>
$('#remove').attr('disabled', 'disabled');
$(document).ready(function() {
$('.cb-element').click(function() {
if($(this).prop('checked'))
{
$('#remove').attr('disabled', false);
}
else
{
$('#remove').attr('disabled', true);
}
});
$('.check:button').click(function()
{
var checked = !$(this).data('checked');
$('input:checkbox').prop('checked', checked);
$(this).data('checked', checked);
if(checked == true)
{
$(this).val('Uncheck All');
$('#remove').attr('disabled', false);
}
else if(checked == false)
{
$(this).val('Check All');
$('#remove').attr('disabled', true);
}
});
});

The top answer didn't do it for me. This did though:
<script type="text/javascript">
$(document).ready(function(){
$("#li_13").click(function(){
if($("#agree").attr('checked')){
$("#saveForm").fadeIn();
}
else
{
$("#saveForm").fadeOut();
}
});
});
</script>
Basically when the element #li_13 is clicked, it checks if the element # agree (which is the checkbox) is checked by using the .attr('checked') function. If it is then fadeIn the #saveForm element, and if not fadeOut the saveForm element.

To act on a checkbox being checked or unchecked on click.
$('#customCheck1').click(function() {
if (this.checked) {
console.log('checked');
} else {
console.log('un-checked');
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="checkbox" id="customCheck1">
EDIT: Not a nice programming expression if (boolean == true) though .checked property might return other type variables as well..
It is better to use .prop("checked") instead. It returns true and false only.

I am using this:
<input type="checkbox" id="isAgeSelected" value="1" /> <br/>
<input type="textbox" id="txtAge" />
$("#isAgeSelected").is(':checked') ? $("#txtAge").show() : $("#txtAge").hide();

Though you have proposed a JavaScript solution for your problem (displaying a textbox when a checkbox is checked), this problem could be solved just by css. With this approach, your form works for users who have disabled JavaScript.
Assuming that you have the following HTML:
<label for="show_textbox">Show Textbox</label>
<input id="show_textbox" type="checkbox" />
<input type="text" />
You can use the following CSS to achieve the desired functionality:
#show_textbox:not(:checked) + input[type=text] {display:none;}
For other scenarios, you may think of appropriate CSS selectors.
Here is a Fiddle to demonstrate this approach.

Develop Reference

JavaScript is the programming language of the Web.

Submit form only if at least one checkbox is checked - javascript

//dom ready handler jQuery(function ($) { //form submit handler $('#booking').submit(function (e) { //check atleat 1 checkbox is checked if (!$('.roomselect').is(':checked')) { //prevent the default form submit if it is not checked e.preventDefault(); } }) })

You can use :checked selector along with .length to find checked checkbox count: var len = $(".roomselect:checked").length; if(len>0){ //more than one checkbox is checked } Demo

The :checked selector will Match all elements that are checked or selected. You could try this $("#subm").click(function(e){ if($(".roomselect:checked").length == 0){ e.preventDefault(); } });

Vanilla JavaScript equivalent of the jQuery way, using document.querySelector if (document.querySelector('.roomselect:checked')) { // somethings checked } Demo

$("#form_id").submit(function(e) { var totalChecked = $('#div_id:input[type="checkbox"]:checked').length; if(totalChecked < 1) { alert('Please select at least one checkbox before submit'); return false; } });

Related

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How do I check whether a checkbox is checked in jQuery?

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