RegisterClientScriptBlock in PreRender

[Jon Paugh]

I noticed that if in my WebControl derived class I call
RegisterClientScriptBlock in my Render method I don't see
the javascript, but if I call it from PreRender, I do see
the javascript in my html page. I would love to know
why ?

 

[Teemu Keiski]

Because those scripts are rendered when Page passes to Render phase, so
calling RegisterXXX methods in Render is too late for them gettting to
outputted (because Page has already prepared them)