<form name="sample1">
<select size="1" name="make" onchange="UpdateSample1()">
<option value="Ford" selected>Ford</option>
<option value="Toyota">Toyota</option>
</select>
<select size="1" name="model">
<option selected>Explorer</option>
<option>Mustang</option>
<option>Probe</option>
</select>
</form>function UpdateSample1()
{
var makeSelect = document.forms.sample1.make;
var modelSelect = document.forms.sample1.model; modelSelect.options.length = 0; // Clear the popup if (makeSelect.options[makeSelect.selectedIndex].value == "Ford")
{
modelSelect.options[0] = new Option("Explorer");
modelSelect.options[1] = new Option("Mustang");
modelSelect.options[2] = new Option("Probe");
}
else if (makeSelect.options[makeSelect.selectedIndex].value == "Toyota")
{
modelSelect.options[0] = new Option("Camry");
modelSelect.options[1] = new Option("Celica");
modelSelect.options[2] = new Option("MR2");
modelSelect.options[3] = new Option("4Runner");
}
}
<select size="1" name="make" onchange="UpdateSample1()">
<option value="Ford" selected>Ford</option>
<option value="Toyota">Toyota</option>
</select>
<select size="1" name="model">
<option selected>Explorer</option>
<option>Mustang</option>
<option>Probe</option>
</select>
</form>function UpdateSample1()
{
var makeSelect = document.forms.sample1.make;
var modelSelect = document.forms.sample1.model; modelSelect.options.length = 0; // Clear the popup if (makeSelect.options[makeSelect.selectedIndex].value == "Ford")
{
modelSelect.options[0] = new Option("Explorer");
modelSelect.options[1] = new Option("Mustang");
modelSelect.options[2] = new Option("Probe");
}
else if (makeSelect.options[makeSelect.selectedIndex].value == "Toyota")
{
modelSelect.options[0] = new Option("Camry");
modelSelect.options[1] = new Option("Celica");
modelSelect.options[2] = new Option("MR2");
modelSelect.options[3] = new Option("4Runner");
}
}
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