Hi everybody

I use a javascript to select and deselect items in a listbox depending on checkbox selection

The problem now i have is, i am calling the javascript from server side

What happens is as the listbox 1 get populated, and selected with checkbox selection in my application,
i have a button which refreshes the page thereby populating listbox2, with reference to the items selected in listbox1

So what is happening is,
- the user selects checkall-- all items get selected
- the user hits the refresh button -- all the items deselected and also checkbox is marked unchecked

Hope you can understand my issue
Please help me to fix this dilemma
Thanks to all

9 Years
Discussion Span
Last Post by Sarah Lee

The application that your working on.. is it a web application? and i really can't understand what the error is.. May be you can post some code and explain it with a screen shot.


Thanks for your response
it is a web application
The code i am using is

function onChange(checkBoxRef,listboxId)

var listboxRef = document.getElementById(listboxId)


for (var i=0;i<listboxRef.options.length;i++)


listboxRef.options[i].selected = true;


for (var i=0; i<listboxRef.options.length; i++)


listboxRef.options[i].selected = false;


function removeCheck(checkboxId)
document.getElementById(checkboxId).checked = false;

And in code behind i am using

lstAccounts.Attributes.Add("onChange", "Javascript:removeCheck('" + chkAll.ClientID + "');")
chkAll.Attributes.Add("onClick", "javascript:onChange(this, '" + lstAccounts.ClientID + "');")

When the page is refreshed by a button click, all the items are deselcted and the checkbox mark is also gone
Any ideas, what is wrong with my code?

Thank you very much

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