A classic example here:
http://www.webtricks.com/s
A more dynamic way here:
http://www.mattkruse.com/j
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Question
populate dropdown of one selection for another dropdown listing
i want to be able to select from a drop down lets say drop down 1 this then in return picks from a listing and allows for the next drop down to be populated.
ie
first selection in drop down has
Apples
Oranges
Pears
next drop down now has if user picks Apples from first drop down
Apple 1
Apple 2
Apple 3
if a user had picked Orange then it would be
Orange 1
Orange 2
Orange 3
what im looking to do really is populate the halls of a college from a picked drop down of colleges
thank you for any help or code you may provide
im using php as well but i figured java would be better suited for this solution
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Answers
Here's an example of how to do this using AJAX:
http://www.DecodeTheCode.c
Have any questions about it ask me... I wrote it.
this was the type of thing i was looking for
<HTML>
<HEAD>
<TITLE>Dynamic SELECTs</title>
<SCRIPT language='JavaScript'>
<!-- //
// create js arrays to hold the data for selCity
var aryCityData = new Array();
aryCityData[0] = new Array();
aryCityData[0][0] = new Option('Select a State','0');
aryCityData[1] = new Array();
aryCityData[1][0] = new Option('Los Angeles','301');
aryCityData[1][1] = new Option('Oakland','304');
aryCityData[1][2] = new Option('Rio Linde','305');
aryCityData[1][3] = new Option('San Diego','302');
aryCityData[1][4] = new Option('San Fransisco','303');
aryCityData[2] = new Array();
aryCityData[2][0] = new Option('Miami','101');
aryCityData[2][1] = new Option('Orlando','102');
aryCityData[2][2] = new Option('Tampa','103');
aryCityData[3] = new Array();
aryCityData[3][0] = new Option('Abilene','201');
aryCityData[3][1] = new Option('Austin','202');
aryCityData[3][2] = new Option('Dallas','203');
aryCityData[3][3] = new Option('Houston','204');
function reloadCities(curStateIndex
{
if ( curStateIndex < 0 ) return; // no state selected, so do nothing
var aryCityOpts = document.myform.selCity.op
aryCityOpts.length=0; // first, clear the current City options ...
// then re-load the City options with values for the current State
for ( var i=0,n=aryCityData[curState
{
//// the line below no longer works in IE5 (it works in IE4 and NS4+).
// aryCityOpts[aryCityOpts.le
//// therefore, it now takes three lines to do the same thing:
aryCityOpts.length++; // add a new Option, then put data in it (below)
aryCityOpts[aryCityOpts.le
aryCityOpts[aryCityOpts.le
}
}
// -->
</script>
</head>
<BODY onLoad='document.myform.se
<FORM name='myform' method='post' action='whatever.asp' onSubmit='return(false);'>
State:
<SELECT name='selState' size='1' onChange='reloadCities(thi
<OPTION value='0'></option>
<OPTION value='30'>California</opt
<OPTION value='10'>Florida</option
<OPTION value='20'>Texas</option>
</select><P>
City:
<SELECT name='selCity' size='1' onChange='alert(this.optio
<OPTION value=''>Select a State</option>
<OPTION></option>
<OPTION></option>
<OPTION></option>
</select><P>
</form>
</body>
</html>
the above example works for me. i only have 3 coledges and they have about 15 halls in each so it worked really well for me
thanks for all your help. alto i found the answer myself.
have you thought about what happens if the user does not have Javascript available?
just something to keep in mind. check out this solution that would work with JS off as well:
http://www.wait-till-i.com
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by: ZvonkoPosted on 2007-05-21 at 13:38:02ID: 19129605
JavaScript is usable for that purpose as long as the Complette list of all Colleges combinations and therir option does not go above lets say hundred options.
When you have twenty colleges and every colleg does ahve twenty options, then you have a grand total of four handred options to load with EVERY page. That is vaste of bandwidth.
Better do it then on PHP side by posting the form on select change.