Here's the HTML
<select style="height: 50px;" multiple="" name="categories[]" id="categories">
<option value="7">Mozambique</option>
<option value="11">Namibia</option>
<option value="6">South Africa</option>
<option value="9">Zambia</option>
<option value="10">Zimbabwe</option>
</select>
Here's the javascript:
<script type="text/javascript">
var noCategorySelected = true;
var categoryElem = document.getElementById('categories');
for (var i = 0;i < categoryElem.options.length-1;i++) {
if(categoryElem.options){
if (categoryElem.options.selected) {
noCategorySelected = false;
}
}
}
if(noCategorySelected){
alert('\n * You need to select at least on category');
}
</script>
By PHPin24 @ 2009-10-18 23:30:45
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