Qt way of getting/parsing style attributes from html tags? local file batch

**numbat** · 10th June 2010, 18:11

This will get you everything. That may not be what you want. I'm not sure of a way of getting only author specified styles.

Qt Code:

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#include <QtWebKit>
#include <QApplication>
#include <QtCore>
int main(int argc, char * argv[])
{
    QApplication a(argc, argv);
 
    QWebPage page;
    QWebFrame * frame = page.mainFrame();
    frame->setHtml("<html><head><style>div { color:blue; }</style><body><div style=\"font-size:120%;\">Hello World!</div></body></html>");
    QWebElement document = frame->documentElement();
    QWebElementCollection elements = document.findAll("div");
    foreach (QWebElement element, elements)
    {
        QString style = element.evaluateJavaScript("getComputedStyle(this).cssText").toString();
        QStringList styles = style.split(';');
        foreach(QString pair, styles)
        {
            QStringList keyvalue = pair.split(':');
 
            if (keyvalue.length() == 2)
                qDebug() << keyvalue.at(0).trimmed() << " = " << keyvalue.at(1).trimmed();
        }
    }
}

#include <QtWebKit>
#include <QApplication>
#include <QtCore>
int main(int argc, char * argv[])
{
    QApplication a(argc, argv);

    QWebPage page;
    QWebFrame * frame = page.mainFrame();
    frame->setHtml("<html><head><style>div { color:blue; }</style><body><div style=\"font-size:120%;\">Hello World!</div></body></html>");
    QWebElement document = frame->documentElement();
    QWebElementCollection elements = document.findAll("div");
    foreach (QWebElement element, elements)
    {
        QString style = element.evaluateJavaScript("getComputedStyle(this).cssText").toString();
        QStringList styles = style.split(';');
        foreach(QString pair, styles)
        {
            QStringList keyvalue = pair.split(':');

            if (keyvalue.length() == 2)
                qDebug() << keyvalue.at(0).trimmed() << " = " << keyvalue.at(1).trimmed();
        }
    }
}

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**toglia3d** · 10th June 2010, 19:08

Thanks numbat. I will check it out when I get home. Seems like your doing everything I need.

Another thing, is there a more elegant way of putting the file into a QString than the following?

Qt Code:

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QFile file("local.html");
QTextStream in(&file);
QString completeHtml;
while (!in.atEnd()) {
	completeHtml.append(in.readLine());
}

QFile file("local.html");
QTextStream in(&file);
QString completeHtml;
while (!in.atEnd()) {
	completeHtml.append(in.readLine());
}

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**numbat** · 10th June 2010, 19:15

You can use readAll. Here's a way to just get the rules in the style sheets:

Qt Code:

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#include <QtWebKit>
#include <QApplication>
#include <QtCore>
int main(int argc, char * argv[])
{
    QApplication a(argc, argv);
 
    QWebPage page;
    QWebFrame * frame = page.mainFrame();
    frame->setHtml("<html><head><style>div { color:blue; } span {font-weight: bold;}</style><body><div style=\"font-size:120%;\">Hello World!</div></body></html>");
        QVariant vt = frame->evaluateJavaScript(
                                                 "out = []; "
                                                 "for (j = 0; j < document.styleSheets.length; j++) { "
                                                "for (i = 0; i < document.styleSheets[j].cssRules.length; i++) { "
                                                 "out[i] = document.styleSheets[j].cssRules[i].style.cssText; } } "
                                                "out = out;");
        foreach (QVariant v, vt.toList())
        {
             qDebug() << v.toString();
        }
}

#include <QtWebKit>
#include <QApplication>
#include <QtCore>
int main(int argc, char * argv[])
{
    QApplication a(argc, argv);

    QWebPage page;
    QWebFrame * frame = page.mainFrame();
    frame->setHtml("<html><head><style>div { color:blue; } span {font-weight: bold;}</style><body><div style=\"font-size:120%;\">Hello World!</div></body></html>");
        QVariant vt = frame->evaluateJavaScript(
                                                 "out = []; "
                                                 "for (j = 0; j < document.styleSheets.length; j++) { "
                                                "for (i = 0; i < document.styleSheets[j].cssRules.length; i++) { "
                                                 "out[i] = document.styleSheets[j].cssRules[i].style.cssText; } } "
                                                "out = out;");
        foreach (QVariant v, vt.toList())
        {
             qDebug() << v.toString();
        }
}

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**toglia3d** · 10th June 2010, 19:44

Thanks again.

Seriously, Qt has all the nutrients and vitamins a young programmer needs to grow healthy.

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