Button1 "ClientID". HTML-, document.getElementById("<%= Button1.ClientID %>"), , .
:
document.getElementById("<%= Button1.ClientID %>").click();
, .click() . JavaScript ( ):
// Where 'button' is the value of the document.getElementById() function:
if (button.dispatchEvent) {
var e = document.createEvent("MouseEvents");
e.initEvent("click", true, true);
button.dispatchEvent(e);
}
else {
button.click();
}