How to add JavaScript from Code Behind C#?

Question

How do I run this javascript from code behind C# during page load? Thanks a lot and many thanks in advance.

<script type="text/javascript">
document.onkeydown = function (event)
{
     event = (event || window.event);
     if (event.keyCode == 20)
     {
          alert('Caps not allow');
     }
}
</script>

Isn't that javascript will already lood on page load? I think we are missing what you are trying to achieve. Can you give more details? — tontonsevilla
– tontonsevilla, Commented Aug 21, 2020 at 15:23
I am so sorry. What I am trying to achieve is that instead of putting the JavaScript in the HTML page. I would like to load the JavaScript from asp.net webforms code behind using c# during page load. Thanks — Nat
– Nat, Commented Aug 21, 2020 at 17:16

Jeff Mergler · Accepted Answer · 2020-08-21 18:06:24Z

1

Try using the RegisterStartupScript method.

Example in c#:

private void Page_Load1(object sender, System.EventArgs e)
{
    string js = "document.onkeydown = function (event) { event = (event || window.event); if (event.keyCode == 20) { alert('Caps not allow'); } }";

    ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "capscheck", js, true);
}

answered Aug 21, 2020 at 18:06

Jeff Mergler

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