How to call javascript in for loop code behind?

Question

protected void Button1_Click(object sender, EventArgs e)
{
    for (int i = 0; i < 100; i++)
    {
        Page.ClientScript.RegisterClientScriptBlock(GetType(), "myScript", "<script>alert('hello world');</script>");
    }
}

The alert only execute once, is that possible to execute the alert everytime in the iteration?

I think the script can only be registered once, but anyhow it will always run after the page is sent to the client (the button click event is already finished being on the server side) — mslliviu
– mslliviu, Commented Sep 5, 2011 at 7:00

Waqas · Accepted Answer · 2011-09-05 06:59:35Z

7

yes by changing it to, note the "myScript" + i, it changes the key om every iteration:

for (int i = 0; i < 100; i++)
        {
            Page.ClientScript.RegisterClientScriptBlock(GetType(), "myScript" + i, "<script>alert('hello world');</script>");
        }

answered Sep 5, 2011 at 6:59

Waqas

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8 Comments

DEN Over a year ago

@Wagas, what about doing it in update panel?it is not working in update panel

James Khoury Over a year ago

@DEN i beleive its the same except you .RegisterStartupScript( msdn.microsoft.com/en-us/library/…

Waqas Over a year ago

for update panel you can use ScriptManager.RegisterStartupScript(..)

DEN Over a year ago

@james Khoury, i found out it only start calling the javascript function after the iteration. Is that possible to call it while it is looping through?

Waqas Over a year ago

@DEN nope you can't achieve what you are looking for because the looping is done in code behind and it first compiled by the asp.net process which in turn generated the appropriate html and javascript and send output back to browser

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Parth Patel · Accepted Answer · 2011-09-05 06:59:29Z

2

I have got the solution and for that you have to change key at every loop like:

Page.ClientScript.RegisterClientScriptBlock(GetType(), "myScript", "<script>alert('hello world');</script>");
        Page.ClientScript.RegisterClientScriptBlock(GetType(), "myScript1", "<script>alert('hello world');</script>");

answered Sep 5, 2011 at 6:59

Parth Patel

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