javascript - Is there a way to pause or wait for a function to finish before onsubmit action in form -


i have simple example, found out onsubmit requires return value right away. have function pauses 5 seconds , wait till completes returns boolean value simulate other javascript processing action. however, page form submission still triggers before function manages return values. should do, using callback in js in case? 

<html> <body>  <form action="test.html" onsubmit="return testing();"> <button type="submit"> hello world </button> </form>  </body> <script> function testing() {     var newstate = -1;     settimeout(function() {     if (newstate == -1) {       alert('video has stopped');       output = "newtext";       console.log("after 5 sec: " + output);       return false;     }   }, 5000);     //return false; } </script> </html>

one option call testing() in button click itself. can manually call submit() within timeout function. sure return false after calling testing().

for example:

<form id="myform" action="test.html">     <button type="submit" onclick="testing(); return false;"> hello world </button> </form>   <script type="javascript"> function testing() {     var newstate = -1;      settimeout(function() {        if (newstate == -1) {           alert('video has stopped');           output = "newtext";           console.log("after 5 sec: " + output);           document.getelementbyid("myform").submit();           return false;        }    }, 5000);    //return false; } </script>

btw, there appears no need newstate variable.


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