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Print - Smarter Dynamic Select Options - JavaScriptBank.com

Full version: jsB@nk » Form » Dropdown » Smarter Dynamic Select Options
URL: http://www.javascriptbank.com/smarter-dynamic-select-options.html

Smarter Dynamic Select Options © JavaScriptBank.comLet use this multiple select script if you want to create select boxes that relate to anothers, by onchange event. Choose a value in the first select options and the script will precess and display the available select values in the second box to match your selection automatically. Easy to use, with full comments in source code.You can also see more for multiple select, dynamic dropdown,...

Full version: jsB@nk » Form » Dropdown » Smarter Dynamic Select Options
URL: http://www.javascriptbank.com/smarter-dynamic-select-options.html



JavaScript
<script type="text/javascript">// Created by: Bobby van der Sluis | http://www.bobbyvandersluis.com/// Details can be found at:// http://www.bobbyvandersluis.com/articles/unobtrusivedynamicselect.phpfunction dynamicSelect(id1, id2) { // Feature test to see if there is enough W3C DOM support if (document.getElementById && document.getElementsByTagName) {  // Obtain references to both select boxes  var sel1 = document.getElementById(id1);  var sel2 = document.getElementById(id2);  // Clone the dynamic select box  var clone = sel2.cloneNode(true);  // Obtain references to all cloned options  var clonedOptions = clone.getElementsByTagName("option");  // Onload init: call a generic function to display the related options in the dynamic select box  refreshDynamicSelectOptions(sel1, sel2, clonedOptions);  // Onchange of the main select box: call a generic function to display the related options in the dynamic select box  sel1.onchange = function() {   refreshDynamicSelectOptions(sel1, sel2, clonedOptions);  }; }}function refreshDynamicSelectOptions(sel1, sel2, clonedOptions) { // Delete all options of the dynamic select box while (sel2.options.length) {  sel2.remove(0); } // Create regular expression objects for "select" and the value of the selected option of the main select box as class names var pattern1 = /( |^)(select)( |$)/; var pattern2 = new RegExp("( |^)(" + sel1.options[sel1.selectedIndex].value + ")( |$)"); // Iterate through all cloned options for (var i = 0; i < clonedOptions.length; i++) {  // If the classname of a cloned option either equals "select" or equals the value of the selected option of the main select box  if (clonedOptions[i].className.match(pattern1) || clonedOptions[i].className.match(pattern2)) {   // Clone the option from the hidden option pool and append it to the dynamic select box   sel2.appendChild(clonedOptions[i].cloneNode(true));  } }}// Multiple onload function created by: Simon Willison// http://simon.incutio.com/archive/2004/05/26/addLoadEventfunction addLoadEvent(func) {  var oldonload = window.onload;  if (typeof window.onload != 'function') {    window.onload = func;  } else {    window.onload = function() {      if (oldonload) {        oldonload();      }      func();    }  }}// addLoadEvent(nameOfSomeFunctionToRunOnPageLoad);addLoadEvent(function() {dynamicSelect("pda-brand", "pda-type");});</script>


HTML
<form><div><select id="pda-brand"> <option value="select">Select PDA brand...</option> <option value="dell">Dell</option> <option value="hp">HP</option> <option value="palmone">PalmOne</option></select><select id="pda-type"> <option class="select" value="select">Select PDA type...</option> <option class="dell" value="aximx30">Axim X30</option> <option class="dell" value="aximx50">Axim X50</option> <option class="hp" value="ipaqhx2750">iPAQ hx2750</option> <option class="hp" value="ipaqrx3715">iPAQ rx3715</option> <option class="hp" value="ipaqrz1710">iPAQ rz1710</option> <option class="palmone" value="tungstene2">Tungsten E2</option> <option class="palmone" value="tungstent5">Tungsten T5</option> <option class="palmone" value="zire72">Zire 72</option></select></div></form>