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Lists & Combos

Posted on 2000-05-08
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Last Modified: 2013-12-25
Is there a way to filter a combo list based on the selection of another combo list without revisting the server and that works in both IE 4+ and Netscape 4+?



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Question by:mshire
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by:
xabi earned 100 total points
ID: 2795707
Here goes an example:

--------- 8< --------- 8< ----------
<html>
<head>
<title>Example</title>
<script language="javascript">
<!--
var aOptions = new Array()
aOptions["1_"]     = "Fruit"
aOptions["1_1_"]   = "Fruit Orange"
aOptions["1_2_"]   = "Fruit Apple"
aOptions["1_1_1_"] = "Fruit Orange Good"
aOptions["1_1_2_"] = "Fruit Orange Bad"
aOptions["1_2_1_"] = "Fruit Apple Green"
aOptions["1_2_2_"] = "Fruit Apple Red"
aOptions["1_2_3_"] = "Fruit Apple Yellow"

aOptions["2_"]     = "Color"
aOptions["2_1_"]   = "Color Red"
aOptions["2_2_"]   = "Color Blue"
aOptions["3_3_"]   = "Color Green"
aOptions["2_1_1_"] = "Color Red Dark"
aOptions["2_1_2_"] = "Color Red Light"
aOptions["2_2_1_"] = "Color Blue Dark"
aOptions["2_2_2_"] = "Color Blue Light"
aOptions["2_3_1_"] = "Color Green Dark"
aOptions["2_3_2_"] = "Color Green Light"

aOptions["3_"]     = "Number"
aOptions["3_1_"]   = "Number Big"
aOptions["3_2_"]   = "Number Small"
aOptions["3_1_1_"] = "Number Big 1000"
aOptions["3_1_2_"] = "Number Big 2000"
aOptions["3_1_3_"] = "Number Big 3000"
aOptions["3_2_1_"] = "Number Small 2"
aOptions["3_2_2_"] = "Number Small 5"
aOptions["3_2_3_"] = "Number Small 9"

function level(sTmp) {
 iTmp = 0
 for (i=0; i<sTmp.length; i++) {
  if (sTmp.charAt(i) == "_") iTmp++
 }
 return iTmp
}

function redo_level3() {
 idselect = document.myform.myselect3
 idselect.length = 0
 if (document.myform.myselect2.selectedIndex != -1) {
  sTmp = document.myform.myselect2.options[document.myform.myselect2.selectedIndex].value
 } else {
  if (document.myform.myselect1.selectedIndex != -1) {
   sTmp = document.myform.myselect1.options[document.myform.myselect1.selectedIndex].value
  } else {
   sTmp = ""
  }
 }
 for (sName in aOptions) {
  if ((level(sName) == 3) && (sName.substr(0,sTmp.length) == sTmp)) {
   idselect.length++
   idselect.options[idselect.length-1].value = sName
   idselect.options[idselect.length-1].text  = aOptions[sName]
  }
 }
}

function redo_level2() {
 idselect = document.myform.myselect2
 idselect.length = 0
 if (document.myform.myselect1.selectedIndex != -1) {
  sTmp = document.myform.myselect1.options[document.myform.myselect1.selectedIndex].value
 } else {
  sTmp = ""
 }
 for (sName in aOptions) {
  if ((level(sName) == 2) && (sName.substr(0,sTmp.length) == sTmp)) {
   idselect.length++
   idselect.options[idselect.length-1].value = sName
   idselect.options[idselect.length-1].text  = aOptions[sName]
  }
 }
 redo_level3()
}

function redo_level1() {
 idselect = document.myform.myselect1
 idselect.length = 0
 for (sName in aOptions) {
  if (level(sName) == 1) {
   idselect.length++
   idselect.options[idselect.length-1].value = sName
   idselect.options[idselect.length-1].text  = aOptions[sName]
  }
 }
 redo_level2()
}

//-->
</script>
</head>
<body onload="redo_level1()">
 <form name="myform">
  <select name="myselect1" size="4" onchange="redo_level2()">
  <option>--------------------------------------------------------------</option>
  </select>
  <br><br>
  <select name="myselect2" size="4" onchange="redo_level3()">
  <option>--------------------------------------------------------------</option>
  </select>
  <br><br>
  <select name="myselect3" size="4">
  <option>--------------------------------------------------------------</option>
  </select>
 </form>
</body>
</html>
---------- 8< ----------- 8< ---------

If you need more info just ask.

xabi
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Author Comment

by:mshire
ID: 2799736
With a little alteration, I managed to get it to work the way I wanted... I've just got to try it out on Netscape. Thanks.
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