I need to define a radio input with Name='status' and Value='X' in a form with id='A'. Just like setting selected, in a Value='X' in a form with id='B'.
document.querySelector("form[id='A'] input[name='status'][value=1]").checked = true;
document.querySelector("form[id='B'] select[id='cars'][value=volvo]").selected = true;
document.querySelector("form[id='C'] input[name='status'][value=2]").checked = true;<form id='A'>
FROM A - Radio Test checked: <br>
Value 1 <input type='radio' name='status' value='1' /> <br>
Value 2 <input type='radio' name='status' value='2' /> <br>
Value 3 <input type='radio' name='status' value='3' />
</form>
<hr>
<form id='B'>
FROM B - Select Test selected: <br>
<select id="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="vw">VW</option>
<option value="audi" selected>Audi</option>
</select>
</form>
<hr>
<form id='C'>
FROM C - Radio Test checked: <br>
Value 1 <input type='radio' name='status' value='1' /> <br>
Value 2 <input type='radio' name='status' value='2' /> <br>
Value 3 <input type='radio' name='status' value='3' />
</form>Try this
document.querySelector("form[id='A'] input[name='status'][value='1']").checked = true;
instead of this
document.querySelector("form[id='A'] input[name='status'][value=1]").checked = true;
you have to quote the value