Resolve the event issue

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Resolve the event issue

Jonathan 65

Hi,

As event was deprecated, how to correct it below?

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Answer 1

Jack Dang (WICLOUD CORPORATION) 16,040 Microsoft External Staff Moderator

Hi @Jonathan ,

Thanks for clarifying.

You can simplify your function like this:

function testKeyCode(e) {
    e = e || window.event;       // fallback for old browsers
    var keycode = e.keyCode;     // numeric key value

    if (keycode === 37 && e.altKey) {
        CallButtonClick2();
        window.history.back();
    }
}

document.onkeydown = testKeyCode;

Jack Dang (WICLOUD CORPORATION) 16,040 Reputation points Microsoft External Staff Moderator

2026-02-05T11:08:01.48+00:00

Hi @Jonathan ,

Thanks for your response.

I have enabled it. Feel free to interact with the system accordingly.

Answer 2

Jack Dang (WICLOUD CORPORATION) 16,040 Microsoft External Staff Moderator

Hi @Jonathan ,

Thanks for reaching out.

Instead of your current line:

if (window.event) keycode = window.event.keyCode;

You can use a modern approach like this:

document.addEventListener('keydown', function(event) {
    let keyPressed = event.key; // gives the key like "a", "Enter", etc.
    console.log("Key pressed:", keyPressed);
});

Here, event is automatically provided, and event.key is more readable than keyCode. If you’re using this on an ASP.NET page, this works seamlessly with your existing <asp:TextBox> or other elements.

Hope this helps! If my answer was helpful - kindly follow the instructions here so others with the same problem can benefit as well.

Jonathan 65 Reputation points

2026-02-04T08:19:37.3233333+00:00

Sorry, how about the way to replace the following?

Jack Dang (WICLOUD CORPORATION) 16,040 Microsoft External Staff Moderator

Hi @Jonathan ,

Thanks for your prompt response.

Here’s an example of how you can handle key presses in a modern way, instead of using the old window.event or e.which logic:

<!-- Example script showing how to detect keys -->
<script type="text/javascript">
    // Suppose you have a textbox with ID 'TextBox1'
    var textbox = document.getElementById('<%= TextBox1.ClientID %>');

    textbox.addEventListener('keydown', function(event) {
        // Modern way to get the key pressed
        var keyPressed = event.key;       // readable name like "a" or "Enter"
        var keycode = event.keyCode;      // numeric value if you still need it

        console.log("Key pressed:", keyPressed, keycode);

        // Optional: do something when Enter is pressed
        if (keyPressed === "Enter") {
            alert("Enter key pressed!");
        }
    });
</script>

Notes:

Replace 'TextBox1' with your actual textbox ID.
keyPressed is the modern, readable key name.
keycode replaces your old var keycode = window.event.keyCode || e.which; logic.
Add this <script> at the bottom of your ASP.NET page.

Jonathan 65 Reputation points

2026-02-04T09:20:44.3166667+00:00

Sorry, can it not involve the other textbox as I need to handle it below?
Jonathan 65 Reputation points

2026-02-04T14:44:21.27+00:00

Many thanks. Can you enable your current reply that I can choose it as the answer?

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Resolve the event issue

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