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Subject:
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Page.ClientScript.RegisterStartupScript & Threads
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Posted By:
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VerbatimBOT
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Post Date:
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7/23/2008 5:39:06 AM
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Hi all,
I would like to ask you about an issue I'm experiencing.
I have made a user control which represents a multiple dropdown list with some suboptions (http://img337.imageshack.us/img337/8284/56692765xe3.jpg).
Now, in order to save the state of these three instances on my page, I am using a hidden field for each of them, which stores all the selected IDs and when PostBack happens, I simply fire a JavaScript function which automatically selects all the checkboxes which were selected by the user previously. I hope I made this part clear enough.
Here is the code:
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
string[] selectedValues = this.SelectedValues;
// the state is being cleared, because it will be set again by the JavaScript function
ClearSelectedValues();
System.Threading.Thread.Sleep(20);
// set the state back to the selected one
if (selectedValues.Length > 0)
{
string arrayOfValues = GenerateId();
string script = "var " + arrayOfValues + " = new Array(" + selectedValues.Length + "); ";
for (int i = 0; i < selectedValues.Length; i++)
{
script += arrayOfValues + "[" + i + "] = " + selectedValues[i] + "; ";
}
script += " setCheckedState('chk_" + this.ID + "', " + arrayOfValues + "); ";
Page.ClientScript.RegisterStartupScript(this.GetType(), arrayOfValues,
script, true);
}
}
}
Somehow it only works for the first user control - the first one only manages to save its state. The solution I found is to put the current Thread to sleep for 20 miliseconds.
Does anyone have an explanation why is this working only with Thread.Sleep()?
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Added:
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I would just like add that it works fine without Thread.Sleep() method when I debug code line by line, which is the strangest thing.
Thanks in advance,
Aleksandar Dragosavac
Belgrade, Serbia
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