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copied!<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><input id="maleRadioBox" type="radio" name="sex" value="male">Male<br> <input id="femaleRadioBox" type="radio" name="sex" value="female" checked>Female</input> [...] 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><input id="maleRadioBox" type="radio" name="sex" value="male" checked>Male<br> <input id="femaleRadioBox" type="radio" name="sex" value="female">Female</input> [...] 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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