How to Dynamically Check or Uncheck Checkboxes with JavaScript?

Manipulating Checkbox States Dynamically with JavaScript

JavaScript provides various methods to control the checked state of a checkbox from a web page. Here's how to check or uncheck a checkbox:

Using the Checked Property

The checked property of a element can be directly set to true or false to check or uncheck it.

<br>// Check<br>document.getElementById("checkbox").checked = true;</p>
<p>// Uncheck<br>document.getElementById("checkbox").checked = false;<br>

Using jQuery (v1.6 )

jQuery provides prop(), a more flexible method for manipulating element properties, including the checked state:

<br>// Check<br>$("#checkbox").prop("checked", true);</p>
<p>// Uncheck<br>$("#checkbox").prop("checked", false);<br>

Using jQuery (v1.5-)

Prior to jQuery v1.6, the attr() method was used for property manipulation. While still functional, it's not the most reliable approach for checkboxes:

<br>// Check<br>$("#checkbox").attr("checked", true);</p>
<p>// Uncheck<br>$("#checkbox").attr("checked", false);<br>

By leveraging these methods, you can dynamically update checkbox states, enabling you to build interactive web interfaces and control form inputs programmatically.

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