提交功能不会触发onsubmit返回功能吗？

Question

I think I have a misunderstanding of the onsubmit attribute. I thought that every submission, like a <input type="submit" ...> , <button></button> or any javascript form.submit() trigger the onsubmit="return function();" after the submit. In other words, I will never see the "last triggered" log.

Example:

 function triggerFirst() { console.log("first triggered"); myForm.submit(); } function triggerLast() { console.log("last triggered"); return true; } 

 <form id="myForm" onsubmit="return triggerLast();"> <input type="button" onclick="triggerFirst();" value="trigger"> </form> 

This example will never trigger the onsubmit, why? I thought onsubmit means if someone submits? Is that false?

Answer 1

It works.

UPDATED: Place the 2nd function inside first.

 function triggerFirst() { alert('wow'); triggerLast() } function triggerLast() { alert('wowpsubmit'); return true; } 

 <form id="myForm" onsubmit='return triggerLast();'> <input type="button" onclick="triggerFirst();" value="trigger" > </form> 

Answer 2

An HTML form does not require javascript to work. Refer the code below:

<form action="action_page.php">
  First name:<br>
  <input type="text" name="firstname" value="Mickey"><br>
  Last name:<br>
  <input type="text" name="lastname" value="Mouse"><br><br>
  <input type="submit" value="Submit">
</form>

The <form action="action_page.php"> declaration is run once the form is submitted.

The <input type="submit" value="Submit"> is a built in type that triggers the form action to run.

See more here

Answer 3

In your triggerFirst function the inner function call to submit does nothing. That submit function is not defined. I think here you want to make the function submit so below I passed a reference to the form into the triggerFirst function. This should clarify things for you. Open the console to view the output.

 function triggerFirst(form) { console.log('triggerFirst') console.log(form); form.submit(); } function triggerLast() { console.log('triggerLast') return true; } 

 <form onsubmit="return triggerLast();"> <input type="button" onclick="triggerFirst(this.form);" value="trigger"> </form>