View source for Add Options to a Combo Box Using JavaScript

You can use a JavaScript function to modify the options available in a pull-down box on the page.

The following example adds a new blank selection at the top of the ''starthour'' field at '''Level 2''':

<pre>
try{
 document.forms[0].starthour.add(new Option("", "", true, true), document.forms[0].starthour.options[0]) 
}
catch(e){ //in IE, try the below version instead of add()
 document.forms[0].starthour.add(new Option("", "", true, true), 0)
}
</pre>

The options available are:
:''document.forms[0].starthour.add(new Option('''''Display text, Store value, defaultSelected, selected'''''), document.forms[0].starthour.options[0]) ''


[[Category:JavaScript]]