Testing if a checkbox is checked with jQuery

Question

If the checkbox is checked, then I only need to get the value as 1; otherwise, I need to get it as 0. How do I do this using jQuery?

$("#ans").val() will always give me one right in this case:

<input type="checkbox" id="ans" value="1" />

Answer 1

<input type="checkbox" id="ans" value="1" />

Jquery : var test= $("#ans").is(':checked') and it return true or false.

In your function:

$test =($request->get ( 'test' )== "true")? '1' : '0';

Answer 2

Stefan Brinkmann's answer is excellent, but incomplete for beginners (omits the variable assignment). Just to clarify:

// this structure is called a ternary operator
var cbAns = ( $("#ans").is(':checked') ) ? 1 : 0;

It works like this:

 var myVar = ( if test goes here ) ? 'ans if yes' : 'ans if no' ;

Example:

var myMath = ( 1 > 2 ) ? 'yes' : 'no' ;
alert( myMath );

Alerts 'no'

If this is helpful, please upvote Stefan Brinkmann's answer.

Answer 3

Just use $(selector).is(':checked')

It returns a boolean value.

Answer 4

// use ternary operators
$("#ans").is(':checked') ? 1 : 0;

Answer 5

$('input:checkbox:checked').val();        // get the value from a checked checkbox

Answer 6

I've came through a case recently where I've needed check value of checkbox when user clicked on button. The only proper way to do so is to use prop() attribute.

var ansValue = $("#ans").prop('checked') ? $("#ans").val() : 0;

this worked in my case maybe someone will need it.

When I've tried .attr(':checked') it returned checked but I wanted boolean value and .val() returned value of attribute value.