dynamically populating a select box depending upon selections in another select box

Dear sir,

I am trying to populate a select box depending on multiple selections in another select box.

I find the dependent select box does not populate at all.

while it does populate if the parent select box is a single election box and not multiple.

i want to use javascript so that for population i do not have to go to the server.

I am using onchange event to execute the function.

 Some one please help.


9/5/2008 2:57:27 PM
asp.net.web-forms 93655 articles. 6 followers. Follow

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Could you post your code?


"Never be so busy making a living that you forget to make a life."
9/5/2008 3:59:03 PM

Relevent code is given below please. Page is able to run. But the box2 is not getting populated.




function init()



var Gstore = new Array(); 

Gstore[0] = new Array('Select');
Gstore[1] = new Array('Select','Arts and Humanities','Communication','Economics','English','Film','Fine Arts','Hindi','History','Journalism','Maths','Pass Course','Political Science','PR/Advertising','Psychology','Sanskrit','Sociology','Statistics','Vocational Course','other');
Gstore[2] = new Array('Select','Architecture','other');
Gstore[3] = new Array('Select','Management','other'); 

function Gpopulate()


var box = document.forms[0].GCourseName;

 var box2 = document.forms[0].GSpecialization;

var number= 0;

var list=new Array();

 for (j=0;j<box.options.length;j+=1)
    if (!number) return;
    box2.options.length = 0;
       number= j;
       list = Gstore[number];
        box2.options[i] = new Option(list[i],list[i]);


<select id="GCourseName" onchange="Gpopulate()" multiple="multiple" runat="server" width="160px">
            <option value="0" selected="selected">Select</option>
            <option value="1">B.A</option>
            <option value="2">B.Arch</option>
  <select onselectstart="Gpopulate()" id="GSpecialization" onchange="SpecChange('GSpecialization')" multiple="multiple" runat="server" width="160">
            <option selected="selected">Select</option>


9/6/2008 4:36:08 AM

Hi pcg,

Please refer the following link to solve your problem, the link will show you how to do it step by step,


But you need to change the following code, just take the HTML parts,

			$$r->print("<form name='abe'>");
			$$r->print("<center><select name='abe1' onchange='dosel()' size='4'>");
			$$r->print("<option value='1'>Ball</option>");
			$$r->print("<option value='2'>Strike</option>");
			$$r->print("<option value='3'>Batted Foul</option>");
			$$r->print("<option value='4'>Batted Fair</option>");
			$$r->print("<select name='abe2' size='4' style='width:200;'>");


Hong-Gang Chen
Microsoft Online Community Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
9/10/2008 9:11:29 AM

Thanks ocean.

This has helped. I am now able to populate the select box2 depending upon the selection in Select box1.

My problem is when I submit the form for processing at server, the population of box2 is not available at all.

I find perhaps view state does not carry the items populated in box2 or their selection to server on submit. Thus the values of box 2 are not available to the function buttonsubmitclick at server to process. I am able to do it in a very round about way of creating some text boxes, filling those with the selected values of the box2 then processing these textboxes values in the buttonsubmitclick function.

Pl suggest the solution.

Thanks in advance.


9/17/2008 12:15:26 PM

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