How can I use a function from an external/custom .js file with QWebEngineView?

Slyzer

Hello guys,

I am sure this is something simple, but I just can't figure out how to use the "w3IncludeHTML()" function from the "w3data.js" file. It works in a normal browser page though.

EDIT: this is my NEW index.html, to match with my "marked as solved" post

//<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <link rel="stylesheet" type="text/css" href="styles.css">
    <!--
    <script type="text/javascript" src="qrc:/scripts/script/w3data.js"></script>
    -->
    <script src="qrc:///qtwebchannel/qwebchannel.js"></script>
  </head>
  <body>
    <div class="page">
      <div id="first_page">

      </div>

    </div>

    <div class="page">
      <div id="last_page">

      </div>
      <div class="text" id="attrid">
      </div>
    </div>


    <script type="text/javascript">
      var updateattribute=function(text)
      {
        var string = document.getElementById("attrid").innerHTML;
        string = string + text;
        document.getElementById("attrid").innerHTML = string;
        //$("#attrid").val(text);
      }
      new QWebChannel(qt.webChannelTransport, function(channel){
        var webobj = channel.objects.webobj;
        window.webobj = webobj;
        webobj.sendText.connect(updateattribute);
      });
    </script>
  </body>
</html>

In the w3data.js is the function:

function w3IncludeHTML(cb) {
  var z, i, elmnt, file, xhttp;
  z = document.getElementsByTagName("*");
  for (i = 0; i < z.length; i++) {
    elmnt = z[i];
    file = elmnt.getAttribute("w3-include-html");
    if (file) {
      xhttp = new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
          elmnt.innerHTML = this.responseText;
          elmnt.removeAttribute("w3-include-html");
          w3IncludeHTML(cb);
        }
      }
      xhttp.open("GET", file, true);
      xhttp.send();
      return;
    }
  }
  if (cb) cb();

If I use an incorrect path, QT complains about "Uncaught ReferenceError: w3IncludeHTML is not defined". So it does find the definition of "w3IncludeHTML()" with the right path but does not execute it.

I tried:

QFile script_file(":/scripts/script/w3data.js");
script_file.open(QIODevice::ReadOnly);
QString script = QString::fromLatin1(script_file.readAll());
script_file.close();
view->page()->runJavaScript(script);       // QWebEngineView *view is in my header file;
view->page()->runJavaScript("w3IncludeHTML();");

I also tried to figure out this tutorial: https://doc.qt.io/qt-5/qtwebengine-webenginewidgets-contentmanipulation-example.html

But I don't understand the relationship between their jQuery file and functions like:

QString code = QStringLiteral("qt.jQuery('a').each( function () { qt.jQuery(this).css('background-color', 'yellow') } )");
view->page()->runJavaScript(code);

I think it definitely has something to do with the append here:

 QFile file;
 file.setFileName(":/jquery.min.js");
 file.open(QIODevice::ReadOnly);
 jQuery = file.readAll();
 jQuery.append("\nvar qt = { 'jQuery': jQuery.noConflict(true) };");   // what does this mean?
 file.close();

But I cannot figure out what this does, unfortunately the jQuery file itself is very unreadable.

Thank you for your time :)

Slyzer

Ok so I managed to import the html by modeling my code similar to the example with:

QString code = QStringLiteral("qt.jQuery('#first_page').load('html/first_page.html');");

//you can even nest it with:
QString code = QStringLiteral(
                "qt.jQuery('#first_page').load('html/first_page.html', ()=>{"
                    "qt.jQuery('#border_content').load('html/border_content.html', ()=>{"   //some other html
                        "qt.jQuery('#last_page').load('html/last_page.html');"
                        "});"
                    "});"
                );

unfortunately I now cannot use the qwebchannel.js script anymore and my css gets screwed :(
even loading it with:

QFile script_file(":/qtwebchannel/qwebchannel.js");
if(!script_file.open(QIODevice::ReadOnly))
     qDebug()<<"Couldn't load Qt's QWebChannel API!";
QString qt_script = QString::fromLatin1(script_file.readAll());
script_file.close();
view->page()->runJavaScript(qt_script);

did not help. Since it is a small project and I am on a short deadline right now I will put everything in one html file and mark this question als solved.

RonaldViscarraL

Hi,

jQuery.append("\nvar qt = { 'jQuery': jQuery.noConflict(true) };");

it says that jQuery will use jQuery instead of $ for refrence it to jquery framework stuff,
this line it appends at the end of the file content readed

for have a jquery readeable you can download the jquery.js not the jquery.min.js

Slyzer

Hey,

thanks for the reply ;)

Ok I will look into the jQuery API and JavaScript tutorials to understand the "WebEngine Content Manipulation Example" better.

Slyzer

Ok so I managed to import the html by modeling my code similar to the example with:

QString code = QStringLiteral("qt.jQuery('#first_page').load('html/first_page.html');");

//you can even nest it with:
QString code = QStringLiteral(
                "qt.jQuery('#first_page').load('html/first_page.html', ()=>{"
                    "qt.jQuery('#border_content').load('html/border_content.html', ()=>{"   //some other html
                        "qt.jQuery('#last_page').load('html/last_page.html');"
                        "});"
                    "});"
                );

unfortunately I now cannot use the qwebchannel.js script anymore and my css gets screwed :(
even loading it with:

QFile script_file(":/qtwebchannel/qwebchannel.js");
if(!script_file.open(QIODevice::ReadOnly))
     qDebug()<<"Couldn't load Qt's QWebChannel API!";
QString qt_script = QString::fromLatin1(script_file.readAll());
script_file.close();
view->page()->runJavaScript(qt_script);

did not help. Since it is a small project and I am on a short deadline right now I will put everything in one html file and mark this question als solved.

Solved How can I use a function from an external/custom .js file with QWebEngineView?