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


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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
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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

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Posted (edited)

What does this thread have to do with AutoIt3 at all, so why post the quest here?

Jos

 

moved

Edited by Jos

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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...:)
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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!

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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.

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