How Do I Correctly Check a Checkbox's Checked Property in jQuery?

Checking the Checkbox's Checked Property with jQuery

Problem:

In jQuery, you are trying to check the checked property of a checkbox to perform an action based on its status. However, the code isn't working correctly, and it's returning false as the default value.

Solution:

To successfully query the checked property of a checkbox in jQuery, follow these steps:

1. Use the jQuery Attribute Selector:

   Instead of using the attr() method, use the attribute selector syntax to retrieve the checked property directly. The attribute selector can be applied to the checkbox's ID or name attribute.

2. Check the Checked Value:

   Once you have the checked property, compare its value to true to determine if the checkbox is checked. The following code example shows how to do this:

   if (jQuery('#isAgeSelected').prop('checked')) {
     // Checkbox is checked
     // Show the textbox
   } else {
     // Checkbox is unchecked
     // Hide the textbox
   }

3. Toggle the Element's Visibility:

   To hide or show the element based on the checkbox's checked status, use jQuery's toggle() method. This method takes a boolean value and toggles the visibility of the element accordingly.

4. Event-Based Approach:

   Alternatively, you can use an event-driven approach to update the element's visibility when the checkbox state changes. Attach a change event handler to the checkbox and use the toggle() method to update the element's visibility within the handler.

Example Code:

// Check the checked property on page load
if ($('#isAgeSelected').prop('checked')) {
  $("#txtAge").show();
} else {
  $("#txtAge").hide();
}

// Event-driven approach
$('#isAgeSelected').change(function() {
  $("#txtAge").toggle(this.checked);
});

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