Question

I have dropdown list on my aspx page. I want to mannually set the selected value which in exist in the dropdown list. this value i am getting in var. i want to set this value as selected value when page get initialize. I want this in javascript. is there any property for dropdown as ddp.SelectedValue=’40’..? here I don’t know the index of 40 in the list.

Answer 1

selectedIndex is a property of HTMLSelectElement so you can do the following:

<select id="foo"><option>Zero<option>One<option>Two</select>
<script>
document.getElementById('foo').selectedIndex = 1;  // Selects option "One"
</script>

And given an OPTION element, you can get its index using the index property:

<select><option>Zero<option id="bar">One<option>Two</select>
<script>
alert(document.getElementById('bar').index);  // alerts "1"
</script>