QString variable to Javascript: Difference between revisions

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{{Cleanup | reason=Auto-imported from ExpressionEngine.}}
{{LangSwitch}}
 
[[Category:snippets]]
[[Category:snippets]]
[[Category:Developing_with_Qt::QtWebKit]]
[[Category:Developing_with_Qt::QtWebKit]]
Small snippet showing how to call two javascript functions, one without any param, and one with a QString param…
Small snippet showing how to call two javascript functions, one without any param, and one with a QString param…


Line 11: Line 9:
  <head>
  <head>
  <script type="text/javascript">
  <script type="text/javascript">
  function displaymessage(str)
  function displaymessage(str)
  {
  {
alert(str);
  alert(str);
  }
  }


function displayhello()
function displayhello()
  {
  {
alert("Hello");
  alert("Hello");
  }
  }
  </script>
  </script>
  </head>
  </head>


<body>
<body>
<form>
  <form>
<input type="button" value="Click me!">
    <input type="button" value="Click me!">
</form>
  </form>
  </body>
  </body>
</html>
</html>
</code>
</code>


Now using the Designer, load this page to a QWebView in your mainwindow. And in the mainwindow.cpp
Now using the Designer, load this page to a {{DocLink|QWebView}} in your mainwindow. And in the mainwindow.cpp


<code>
<code>
QWebFrame *frame = ui->webView->page()->mainFrame();
QWebFrame* frame = ui->webView->page()->mainFrame();


// the below line will call the javascript function that does not have any param
// the below line will call the javascript function that does not have any param
frame->evaluateJavaScript("displayhello()");
frame->evaluateJavaScript("displayhello()");


// now this is how to call the javascript function which takes a QString param
// now this is how to call the javascript function which takes a QString param
QString data("Qt is the Best!"); // can be some large data, say from a file
QString data("Qt is the Best!"); // can be some large data, say from a file


QString param = QString("displaymessage('%1')").arg(data); // FIXME: Does not work if "data" contains a quote character!
QString param = QString("displaymessage('%1')").arg(data); // FIXME: Does not work if "data" contains a quote character!
frame->evaluateJavaScript(param);
frame->evaluateJavaScript(param);
</code>
</code>

Revision as of 22:21, 28 June 2015

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Small snippet showing how to call two javascript functions, one without any param, and one with a QString param…

This is a simple html to test with

<html>
 <head>
 <script type="text/javascript">
 
 function displaymessage(str)
 {
   alert(str);
 }

 function displayhello()
 {
   alert("Hello");
 }
 
 </script>
 </head>

 <body>
   <form>
     <input type="button" value="Click me!">
   </form>
 </body>
</html>

Now using the Designer, load this page to a QWebView in your mainwindow. And in the mainwindow.cpp

QWebFrame* frame = ui->webView->page()->mainFrame();

// the below line will call the javascript function that does not have any param
frame->evaluateJavaScript("displayhello()");

// now this is how to call the javascript function which takes a QString param
QString data("Qt is the Best!"); // can be some large data, say from a file

QString param = QString("displaymessage('%1')").arg(data); // FIXME: Does not work if "data" contains a quote character!
frame->evaluateJavaScript(param);