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    <h2>jQuery 1.6+</h2> <p>Use the new <a href="https://api.jquery.com/prop" rel="noreferrer"><code>.prop()</code></a> method:</p> <pre><code>$('.myCheckbox').prop('checked', true); $('.myCheckbox').prop('checked', false); </code></pre> <h2>jQuery 1.5.x and below</h2> <p>The <code>.prop()</code> method is not available, so you need to use <a href="https://api.jquery.com/attr" rel="noreferrer"><code>.attr()</code></a>.</p> <pre><code>$('.myCheckbox').attr('checked', true); $('.myCheckbox').attr('checked', false); </code></pre> <p>Note that this is <a href="https://github.com/jquery/jquery/blob/1.5.2/test/unit/attributes.js#L157" rel="noreferrer">the approach used by jQuery's unit tests prior to version 1.6</a> and is preferable to using</p> <pre><code>$('.myCheckbox').removeAttr('checked'); </code></pre> <p>since the latter will, if the box was initially checked, change the behaviour of a call to <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement.reset" rel="noreferrer"><code>.reset()</code></a> on any form that contains it - a subtle but probably unwelcome behaviour change.</p> <p>For more context, some incomplete discussion of the changes to the handling of the <code>checked</code> attribute/property in the transition from 1.5.x to 1.6 can be found in the <a href="https://blog.jquery.com/2011/05/03/jquery-16-released/" rel="noreferrer">version 1.6 release notes</a> and the <strong>Attributes vs. Properties</strong> section of the <a href="https://api.jquery.com/prop/" rel="noreferrer"><code>.prop()</code> documentation</a>.</p> <h2>Any version of jQuery</h2> <p>If you're working with just one element, you can always just modify the <a href="https://developer.mozilla.org/en/docs/Web/API/HTMLInputElement" rel="noreferrer"><code>HTMLInputElement</code></a>'s <code>.checked</code> property:</p> <pre><code>$('.myCheckbox')[0].checked = true; $('.myCheckbox')[0].checked = false; </code></pre> <p>The benefit to using the <code>.prop()</code> and <code>.attr()</code> methods instead of this is that they will operate on all matched elements.</p>
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    1. POSetting "checked" for a checkbox with jQuery?
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    1. COIs this getting the value or setting the value? How do I uncheck it?
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    2. COYes this is setting the attribute value, and uncheck by removing the attribute. I have updated my answer to show this.
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    3. CO@Xian removing the the checked attribute makes it impossible to reset the form
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