Not fire button event after attribut adding window open, how to trigger both?

button1.attributes.add("onclick", "window.open(....)")

button_cli开发者_开发技巧ck(object sender, eventargs e) not run

How to make button click trigger when opening a new window?

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call like this...dont call the window.open directly

button1.attributes.add("onclick", "openwindow()")

function openwindow() {
   window.open(....);
}