Filling Dropdown using Javascript

[Mahesh J]

Hi, I am filling the dropdown using javascript. I have given the selected index also. But after any server event the filled values are gone. What could be the reason. Thanks.

[ToddHileHoffer]

The reason is that asp.net uses something called ViewState[^]. If you modify the html on the client via javascrit, that html is gone when the page posts back to the server.

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[r aa j]

newOpt = document.createElement("OPTION"); newOpt = new Option(nodval,nodval); libox.options.add(newOpt); try this..

Rajendran.AL

[Mahesh J]

Hi, Thanks for your reply. Please tell me the solution. Thanks.

[Mahesh J]

Hi, Thanks. I have used that option only. But still after the postback the filled items gone.

[r aa j]

send me your code

Rajendran.AL

[Mahesh J]

var ddlVendor = window.opener.document.getElementById(gId); //Clears the combo box contents. for (var count = ddlVendor.options.length-1; count >-1; count--) { ddlVendor.options[count] = null; } var vendorNodes = listNode.getElementsByTagName('Table1/Name'); var vendorIds = listNode.getElementsByTagName('Table1/Id'); var textValue; var idValue; var optionItem; //Add new vendors list to the vendors combo box. for (var count = 0; count < vendorNodes.length; count++) { textValue = GetInnerText(vendorNodes[count]); idValue = GetInnerText(vendorIds[count]); var newOption = window.opener.document.createElement('OPTION'); newOption.text = textValue; newOption.value = idValue; ddlVendor.options.add(newOption); } ddlVendor.selectedIndex = count-1;

[r aa j]

check the for loop....length and count condition..

Rajendran.AL

[ToddHileHoffer]

If you are using .net 2.0 or higher. I suggest using AJAX and writing server code to populate the drop down. Do you understand why it is that if you populate a dropdown with javascript you're going to have to re-populate that list after every postback?

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[Vasudevan Deepak Kumar]

Mahesh.J wrote:

any server event

The server event resurrects the values from a statebag called ViewState. You ought to rebind your JavaScript dropdown again.

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