QString variable to Javascript: Difference between revisions
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[[Category: | {{LangSwitch}} | ||
[[Category: | [[Category:HowTo]] | ||
[[Category:Snippets::Misc]] | |||
[[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… | ||
This is a simple html to test with | This is a simple html to test with | ||
<code> | <code> | ||
<html | <html> | ||
<head | <head> | ||
<script type="text/javascript"> | <script type="text/javascript"> | ||
function displaymessage(str) | function displaymessage(str) | ||
{ | { | ||
alert(str); | |||
} | } | ||
function displayhello() | function displayhello() | ||
{ | { | ||
alert("Hello"); | |||
} | } | ||
</script | |||
</head | </script> | ||
</head> | |||
<body | <body> | ||
<form> | |||
<input type="button" value="Click me!"> | |||
</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(); | |||
// 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 | // 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! | QString param = QString("displaymessage('%1')").arg(data); // FIXME: Does not work if "data" contains a quote character! | ||
frame->evaluateJavaScript(param); | |||
</code> | </code> | ||
Latest revision as of 12:07, 28 November 2016
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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);