CODEWITHSUNDEEP
htmlc++qthtml-escape-charactersqtxml
Donald Duck
Donald Duck

Reputation: 8882

How do I not escape HTML special characters in QDomText?

I'm trying to create an HTML document containing Javascript using Qt XML. Here is the relevant part of my Qt code:

QDomDocument document;
//Create head, body, etc
QDomElement script = document.createElement("script");
script.setAttribute("type", "text/javascript");
body.appendChild(script);    //body is the QDomElement representing the <body> tag
QDomText scriptText = document.createTextNode("if(x < 0){\n/*do something*/\n}");
script.appendChild(scriptText);

QFile file("C:\\foo.html");
file.open(QIODevice::WriteOnly);
QTextStream stream(&file);
stream << document.toString();

The problem is that in the Javascript code, it's escaping the < character replacing it with &lt;, giving the following output which isn't valid Javascript:

<script type="text/javascript">
    if(x &lt; 0){
        /*do something*/
    }
</script>

I've searched the Qt documentation for a solution, but haven't found anything.

A workaround could be to replace &lt; with < when writing in the file by doing stream << document.toString().replace("&lt;", "<"), but there might also be occurrences of &lt; outside of the Javascript code that I want to leave alone.

I can also think of a few Javascript tricks to check if a number is negative without using any special HTML characters, like for example if(String(x).indexOf('-') != -1), but I would like to know if there is a better way of doing it.

My question is how do I create a QDomText object with text containing special HTML characters like <, >, &, etc without them being escaped in QDomDocument::toString()?

Upvotes: 0

Views: 644

Answers (1)

p-a-o-l-o
p-a-o-l-o

Reputation: 10047

You can put the javascript code in a CDATA section:

  QDomElement script = document.createElement("script");
  script.setAttribute("type", "text/javascript");
  body.appendChild(script);

  QString js = "if(x < 0){\n/*do something*/\n}";
  QDomCDATASection data = document.createCDATASection(js);
  script.appendChild(data);

then remove the unwanted text right after:

  QString text = document.toString();
  text.replace("<![CDATA[", "\n");
  text.replace("]]>", "\n");

Upvotes: 1

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