• property value

For the combo list

• property selectedItem
• collection options of option objects
• property value of option object
• event onchange (you can also use onclick, ideal if there is no pre-selected option in the list). Onchange will only trigger when the current selectedIndex changes. If you did not explicity pre-select an option (by including the attibute "selected" in the <option> tag), by default selectedIndex = 0. If the user cliks in the 1st element then, the text box won't be updated with an onchange, it will with a onclick. But if the user doesn't use the mouse click to select (he uses the cursor keys), onclick will be unuseful, thus your best bet will be to program both events with the same code. Briefly: if you have a pre-selected item in the list, use onchange, if not program onchange and onclick.

<p>Select an option  <select size="1" name="cmbSource" onchange="txtTarget.value=cmbSource.options(cmbSource.selectedIndex).value;"> <option value=1>Option 1 </option> <option value=2>Option 2 </option> <option value=3>Option 3 </option> </select><br> Option selected   <input type="text" name="txtTarget" size="20" id="txtTarget"><br> </p>

• JS is case sensitive in variables names and in reserved words (selectedIndex <> SelectedIndex)
• If you have a pre-selected value in the list, you have to load in code that value in the associated text box at the beginning