Javascript – Removing scripts added by ClientScript.RegisterStartupScript


In my application's login control, I am showing a dialog window if the login failed. In this way:

protected void EMSLogin_Authenticate(object sender, AuthenticateEventArgs e) {
    log.Info("=============INSIDE EMSLogin_Authenticate======");
    RadTextBox UserName = EMSLogin.FindControl("UserName") as RadTextBox;
    RadTextBox Password = EMSLogin.FindControl("Password") as RadTextBox;

    if (Membership.ValidateUser(UserName.Text, Password.Text)) {
        FormsAuthentication.RedirectFromLoginPage(UserName.Text, false);
    } else {
        ClientScript.RegisterStartupScript(typeof(ScriptManager), "CallShowDialog", "showDialog();", true);         

The JavaScript is:

function showDialog() {
    $(document).ready(function () {

Now if the login failed the dialog is showing. But The problem is if I refresh the browser window, after one login failed, the dialog again opened, since the $(".jym").dialog("open") is written in the page. Then I have tried

protected void Page_Unload(object sender, EventArgs e) {        
    log.Info("=============INSIDE Page_Unload======");
    ClientScript.RegisterStartupScript(typeof(ScriptManager), "CallShowDialog", "", true);

But no luck.

Is there any way to solve this problem?

If I use ClientScript.RegisterClientScriptBlock() this not working, I mean the dialog is not opening on error.

Best Solution

Try calling the function:

ClientScript.RegisterStartupScript(typeof(ScriptManager), "CallShowDialog", "", true); the Page_Load event handler.

Page_Load occurs before the button click event handler. You can verify this by adding the following code and looking in the debug/output window:

protected void Page_Load(object sender, EventArgs e)

protected void Button1_Click(object sender, EventArgs e)

So erasing the script in the Page_Load event handler should clear any previous script that was loaded.

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