Javascript Essentials Part 5

Auto Drop Down List – Select from drop down and list updates

<html>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
team = new Array(
new Array(
new Array("Saku Koivu", 39482304),
new Array("Martin Rucinsky", 34802389),
new Array("Jeff Hackett", 39823498),
new Array("Sheldon Sourray", 87587343),
new Array("Richard Zednik", 68798735),
new Array("Brian Savage", 98098509),
new Array("Stephane Robidas", 49490583),
new Array("Patrice Brisebois", 32898334),
new Array("Oleg Petrov", 92340934),
new Array("Chad Kilger", 34923409),
new Array("Benoit Brunet", 59384093),
new Array("Jan Bulis", 83948023),
new Array("Patrick Traverse", 41239812),
new Array("Jose Theodore", 98402398),
new Array("Craig Darby", 82393434),
new Array("Patric Poulin", 34290348),
new Array("Karl Dykhuis", 89092834)
),
new Array(
new Array("Mario Lemieux", 23840238),
new Array("Jaromir Jagr", 92390484),
new Array("Robert Lang", 29048203),
new Array("Alexei Kovalev", 94098230),
new Array("Jean-Sebastien Aubin", 39234923),
new Array("Kevin Stevens", 29345423)
),
null,
new Array(
new Array("Alexei Yashin", 20394802),
new Array("Daniel Alfredson", 34982039),
new Array("Marian Hossa", 92348902),
new Array("Patrick Lalime", 98203894),
new Array("Radek Bonk", 98234902)
)
);
function fillSelectFromArray(selectCtrl, itemArray, goodPrompt, badPrompt, defaultItem) {
var i, j;
var prompt;
// empty existing items
for (i = selectCtrl.options.length; i >= 0; i--) {
selectCtrl.options[i] = null; 
}
prompt = (itemArray != null) ? goodPrompt : badPrompt;
if (prompt == null) {
j = 0;
}
else {
selectCtrl.options[0] = new Option(prompt);
j = 1;
}
if (itemArray != null) {
// add new items
for (i = 0; i < itemArray.length; i++) {
selectCtrl.options[j] = new Option(itemArray[i][0]);
if (itemArray[i][1] != null) {
selectCtrl.options[j].value = itemArray[i][1]; 
}
j++;
}
// select first item (prompt) for sub list
selectCtrl.options[0].selected = true;
   }
}
//  End -->
</script>
</HEAD>
<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->
<BODY>
<FORM NAME="main">
<SELECT NAME="Make" onChange="fillSelectFromArray(this.form.Team, ((this.selectedIndex == -1) ? null : team[this.selectedIndex-1]));">
<OPTION VALUE="-1">Select Team
<OPTION VALUE=1>Montreal Canadiens
<OPTION VALUE=2>Pittsburg Penguins
<OPTION VALUE=3>Toronto Maple Leafs
<OPTION VALUE=4>Ottawa Senators
</SELECT>
<BR>
<SELECT NAME="Team" SIZE="5">
<OPTION></OPTION>
<OPTION></OPTION>
<OPTION></OPTION>
<OPTION></OPTION>
<OPTION></OPTION>
</SELECT>
</FORM>
</body>
</html>

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