How to pass an argument to evaluateJavaScript function?

[TheIndependentAquarius]

for (int i = 0; i < centerPointsList.size (); i++)
    {
        QVariant         holdInformation = map->page ()->mainFrame ()->evaluateJavaScript (QString ("constructFileName (%1).arg (centerPointsList[0].toFloat())"));
        QList <QVariant> allListObj      = holdInformation.toList ();
        QList <QVariant> fileNamesList   = allListObj[0].toList ();
 
        std :: cout << fileNamesList[0].toFloat() << "================= \n";
 
    }

for (int i = 0; i < centerPointsList.size (); i++)
    {
        QVariant         holdInformation = map->page ()->mainFrame ()->evaluateJavaScript (QString ("constructFileName (%1).arg (centerPointsList[0].toFloat())"));
        QList <QVariant> allListObj      = holdInformation.toList ();
        QList <QVariant> fileNamesList   = allListObj[0].toList ();

        std :: cout << fileNamesList[0].toFloat() << "================= \n";

    }

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This results in:

"SyntaxError: Parse error on line:1 Source:undefined"
Segmentation fault

I am guessing that the error is in the way I am passing the list item to the function evaluateJavaScript.

[Santosh Reddy]

See if this works

QString ("constructFileName (%1).arg (centerPointsList[0].toFloat())"); //Change this as below
QString ("constructFileName (%1)").arg(centerPointsList[0].toFloat());

QString ("constructFileName (%1).arg (centerPointsList[0].toFloat())"); //Change this as below
QString ("constructFileName (%1)").arg(centerPointsList[0].toFloat());

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[TheIndependentAquarius]

I tried your way like this:

for (int i = 0; i < centerPointsList.size (); i++)
{
     QVariant holdInformation = map->page ()->mainFrame ()->evaluateJavaScript (QString ("constructFileName (%1)").arg (centerPointsList [0].toFloat ()));

for (int i = 0; i < centerPointsList.size (); i++)
{
     QVariant holdInformation = map->page ()->mainFrame ()->evaluateJavaScript (QString ("constructFileName (%1)").arg (centerPointsList [0].toFloat ()));

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which resulted in:

"TypeError: Result of expression 'centerPointFileName.split' [undefined] is not a function. on line:65 Source:file:///..../index.html"

The function constructFileName (in Javascript) is as follows:

function constructFileName (centerPointFileName)
{
   var removeSpaces              = centerPointFileName.split (" ");
   var fileNameWithoutSpaces = "", i;
   for (i = 0; i < removeSpaces.length; i++)
 	fileNameWithoutSpaces = fileNameWithoutSpaces + removeSpaces [i];

function constructFileName (centerPointFileName)
{
   var removeSpaces              = centerPointFileName.split (" ");
   var fileNameWithoutSpaces = "", i;
   for (i = 0; i < removeSpaces.length; i++)
 	fileNameWithoutSpaces = fileNameWithoutSpaces + removeSpaces [i];

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[Santosh Reddy]

If I am not mistaken the error is inside Java script, not in Qt Code.

Further the error says "TypeError", you are passing a float as argument to JS, where as it expects centerPointFileName (whatever type it is), a spilt on it is called, not sure what will a spilt on float do. (that too split with space).

I guess JS is expecting a multi word string.

[wysota]

Float does not have a "split" method, only String does.

[TheIndependentAquarius]

I cross posted this on stackoverflow and the solution presented in the below link solved my error.
http://stackoverflow.com/a/14170076/462608