What could be causing my ASP.net function to run only once?

In my file named file.aspx.cs, I have the following function:

private void DisplayMessage(string text)
{
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), 
        "displayingMessage", $"alert('{text}')", true);
}

However, there seems to be an issue when I call this function multiple times consecutively. Only the first alert message appears on the screen. For example:

protected void ButtonClick(object sender, EventArgs e)
{
    // click event for button
    DisplayMessage("First message"); // visible on screen
    DisplayMessage("Second message"); // not visible
}

I am curious as to why this behavior occurs. Any insights?

javascriptc#asp.net

Answer №1

To ensure uniqueness, it is advised to assign different keys to script blocks, such as alertMessage1 and alertMessage2. According to documentation from Microsoft:

Each client script requires a unique key and type for identification purposes. Scripts sharing the same key and type will be considered duplicates. Only one script with a specific type and key combination can be registered on the page. Attempting to register an already existing script does not result in duplicate entries.

In my opinion, this coding approach may not be the best practice. I suggest utilizing API endpoints and leveraging JavaScript to control the UI instead of relying heavily on server-side C# code. The current method is quite inefficient, triggering full-page reloads and server-side processing on each button press. Additionally, inserting script blocks into HTML impedes caching mechanisms.

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