how do i check if a jquery checkbox is checked?

If you're developing a web app with jQuery and need to check the state of a checkbox, then you'll want to know how to check if a jquery checkbox is checked. Fortunately, this process is fairly simple and can be accomplished using just a few lines of code.

The easiest way to detect if a jQuery checkbox is checked is by using the .is() method. This method allows us to determine whether or not an element matches certain criteria. In this case, we can use it to determine if a checkbox is checked by passing in ":checked" as the parameter. For example, here's how to detect if any checkboxes are checked on the page:

$('input[type="checkbox"]').each(function(){

if ($(this).is(":checked")) {

// do something

}

});

In this example, we are looping through all of the input elements on the page with a type of "checkbox" and calling our .is() method on each iteration. If the current item in our loop is detected as being "checked", then we do something with it (such as display an alert, hide part of the page, etc.). We could also use this technique to find out how many checkboxes were checked by incrementing a counter every time we detect one that has been ticked:

var numChecked = 0;

$('input[type="checkbox"]').each(function(){

if ($(this).is(":checked")) {

numChecked++;

} }); console.log('Number of checkboxes checked: ' + numChecked);

If you only need to detect whether or not an individual element is checked then you can do so without having to loop through all inputs by calling the .prop() method. The following example would alert true/false depending on whether or not "chkRemindMe" was ticked:

var chk = $('#chkRemindMe').prop("checked"); alert(chk);