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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