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Can javascript change the variable value via the byref like au3?

Letraindusoir

By Letraindusoir
in JavaScript

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Letraindusoir Polymath

Letraindusoir

Posted
Posted (edited)

Reference website:

https://www.quanzhanketang.com/ajax/tryajax_header.html?filename=tryajax_header

Reference Code: 

<!DOCTYPE html>
<html>
<body>

<p>The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p>

<button onclick="loadDoc()">Get header information</button>

<p id="demo"></p>

<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      document.getElementById("demo").innerHTML = xhttp.getAllResponseHeaders();
    }
  };
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}
</script>

</body>
</html>

I modify it as follows: 

<!DOCTYPE html>
<html>
<body>

<p>The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p>

<button onclick="loadDoc()">Get header information</button>

<p id="demo"></p>

<script>
var arh="";
function requery() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
       arh = xhttp.getAllResponseHeaders();
    }
  };
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}
function loadDoc(){
  requery();
  document.getElementById("demo").innerHTML = arh;}
</script>

</body>
</html>

Results can be obtained, but need click twice, not sure why.....

Modify it once again as follows: 

<!DOCTYPE html>
<html>
<body>

<p>The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p>

<button onclick="loadDoc()">Get header information</button>

<p id="demo"></p>

<script>
arh="";
function requery(header) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function(header) {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      header=xhttp.getAllResponseHeaders();
    }
  };
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}
function loadDoc(){
  requery(arh);
  document.getElementById("demo").innerHTML = arh;}
</script>

</body>
</html>

but no result.

if Au3, 

function requery(byRef header) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function(header) {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      header=xhttp.getAllResponseHeaders();
    }
  };
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}

it can use the function 'requery' to change the value of the-address-parameter 'header', but do not know how with js

Please share  experiences with me,

more thanks in advance!

Edited by Letraindusoir
bogQ Universalist

bogQ

Posted
Posted (edited)

You can change global variable data or object and set new data or even better make a return if that is available.  Note that your question is on wrong place, this is autoit help and support part of forum, not a javascript support :) .

https://stackoverflow.com/a/7744623/1775164

Note that your calling  

innerHTML = arh;

probably before data is fetched, 

so delite that line and put 

document.getElementById("demo").innerHTML = header;

right after 

header=xhttp.getAllResponseHeaders();

or use https://javascript.info/async-await

Edited by bogQ

TCP server and client - Learning about TCP servers and clients connection
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Au3impact - Another 3D DLL game engine for autoit. (3impact 3Drad related)



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Letraindusoir Polymath

Letraindusoir

Posted
  • Author
Posted
15 hours ago, bogQ said:

 Note that your question is on wrong place, this is autoit help and support part of forum, not a javascript support :) .

The two are not contradictory.
some au3-udf related to web page operations such as IE.au3,selenium, sometimes need to introduce JS with execScript or eval.
Learn from each other and Perfect it together...:)
Letraindusoir Polymath

Letraindusoir

Posted
  • Author
Posted
16 hours ago, bogQ said:

You can change global variable data or object and set new data or even better make a return if that is available.  Note that your question is on wrong place, this is autoit help and support part of forum, not a javascript support :) .

https://stackoverflow.com/a/7744623/1775164

Note that your calling  


innerHTML = arh;

probably before data is fetched, 

so delite that line and put 


document.getElementById("demo").innerHTML = header;

right after 


header=xhttp.getAllResponseHeaders();

or use https://javascript.info/async-await

Search from web, some say that it can work if change the asynchronous submission to synchronous submission.

more thanks!

  • Moderators
JLogan3o13 Universalist

JLogan3o13

Posted
  • Moderators
Posted
13 hours ago, Letraindusoir said:
Learn from each other and Perfect it together...:)

Much like asking a Toyota group about why your Ford won't start. Just because they are both car groups doesn't mean you're asking the question in the right place.

"Profanity is the last vestige of the feeble mind. For the man who cannot express himself forcibly through intellect must do so through shock and awe" - Spencer W. Kimball

How to get your question answered on this forum!

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