An example of the difference between JQuery and JS submit of

ASP.NET server control postback is using this section of JS code:

 
var theForm = document.forms['form1']; 
if (!theForm) { 
theForm = document.form1; 
} 
function __doPostBack(eventTarget, eventArgument) { 
if (!theForm.onsubmit || (theForm.onsubmit() != false)) { 
theForm.__EVENTTARGET.value = eventTarget; 
theForm.__EVENTARGUMENT.value = eventArgument; 
theForm.submit(); 
} 
} 

The problem today is that you want to assign a value to one of the hidden fields to pass a value to the server before the server-side control posts back.

So I added an event using JQuery's submit([[data],fn]) method, but it didn't work.

I tried it out with $("form:first"). Submit () and found that it triggers the event function.

What's going on? Checking the data, we found that js's native function void submit() does not trigger a submit event. That's why it's in the code above, right

 
if (<span style="color:#006600">!theForm.onsubmit || (theForm.onsubmit() != false</span>)) { 
... 
} 

This sentence.

So let's write the add event

 
$("form:first")<span style="color:#006600">.get(0)</span>.onsubmit = function () { 
... 
}; 

That's it.

In addition, the events added with JQuery's submit([[data],fn]) can be triggered with $().submit().