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    <p>Set the <code>checked</code> attribute like so:</p> <pre><code>document.getElementById('radioId').checked = 'checked'; </code></pre> <p>Inversely, you can remove the attribute to <em>uncheck</em> it:</p> <pre><code>document.getElementById('radioId').removeAttribute('checked'); </code></pre> <p>Write example:</p> <pre><code>&lt;input id="maleRadioBox" type="radio" name="sex" value="male"&gt;Male&lt;br&gt; &lt;input id="femaleRadioBox" type="radio" name="sex" value="female" checked&gt;Female&lt;/input&gt; [...] if( values.maleChecked ) document.getElementById('maleRadioBox').checked = 'checked'; else document.getElementById('maleRadioBox').removeAttribute('checked'); if( values.femaleChecked ) document.getElementById('femaleRadioBox').checked = 'checked'; else document.getElementById('femaleRadioBox').removeAttribute('checked'); </code></pre> <p>Read example:</p> <pre><code>&lt;input id="maleRadioBox" type="radio" name="sex" value="male" checked&gt;Male&lt;br&gt; &lt;input id="femaleRadioBox" type="radio" name="sex" value="female"&gt;Female&lt;/input&gt; [...] if( document.getElementById('maleRadioBox').hasAttribute('checked') ) values.maleChecked = 'checked'; // or maybe values.maleChecked = document.getElementById('maleRadioBox').hasAttribute('checked'); if( document.getElementById('femaleRadioBox').hasAttribute('checked') ) values.femaleChecked = 'checked'; // or maybe values.femaleChecked = document.getElementById('femaleRadioBox').hasAttribute('checked'); </code></pre> <p>You could always make a function to simplify it:</p> <pre><code>function updateRadioInput( id, checked ) { if( checked ) document.getElementById( id ).checked = 'checked'; else document.getElementById( id ).removeAttribute('checked'); } updateRadioInput( 'maleChecked', values.isMaleChecked ); updateRadioInput( 'femaleChecked', values.isFemaleChecked ); // etc... </code></pre>
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    1. POInsert JSON data into radio input with javascript
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    1. COhmm .. where do i set the JSON value: item.value1 ?
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    2. COI thought the question was how to set the radio input as checked/not-checked based on your JSON data. To set the JOSN data based on the checked state, maybe something like this `item.value1 = docuemnt.getElementById('radioId').hasAttribute('checked') ? "checked" : null;` would work?
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    3. COyou are right, it is to set checked/not-checked based on my json data. so i have a div around the radio inputs with id = radioId, and then it should work?
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