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precedence of execution

precedence of execution

Valerie Meunier

4yAsked Aug 7, 2022, 2:18 PM931ASP.NET

This code below gives at the end label1 = "via jv". I was expecting label1 = "via code".

So why is it "via jv"? I thought the order of execution was:

1) aspx file with javascript => "via jv"

2) code-behind.=> "via code"

Thanks

protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = "via code";
}

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Sachin Singh4y ago
Accepted answer
here the JS is simply ignored, because you placed it above the element.
Meaning when Browser will parse it, it will be undefined as there will be no DOM object with ID Label1.
Valerie Meunier4y ago
Thanks.
to summarize:
1) aspx is loaded
2) code-behind is executed
3) jv is executed (if object referenced exists). The place is possibbly important (must be after the referenced object).
Valerie Meunier4y ago
Thanks.
Now i tried this and i got "via code". Is the reason that the reference from javascript to the label happens before the label exists? Is there a rule to place the javascript code in the aspx. page?

protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = "via code";
}
Sachin Singh4y ago
Precedence is Code-->Render Html (any JS).
Server just send an html page to browser when browser creates DOM and if it finds any JS code then it executes it.