Question

Im making firefox extension. One function stores value in every tab, to use it later by other function.

function setValue(value) {

   var attr = gBrowser.document.createAttribute("value");

   attr.value = value;

   gBrowser.document.attributes.setNamedItem(attr);

};



function getValue() {

  var attr = gBrowser.document.attributes.getNamedItem("value");

  if (attr != undefined && attr != null)

    return attr.value;

  else

    return null;

};

For some reason, this doesn’t work. Can you spot an error in my code?
Function getValue() should get value of active tab.

Answer 1

There are more errors than code here:

• There’s no gBrowser.document – you probably meant gBrowser.ownerDocument or just document (equivalent but simpler).
• Neither is gBrowser.document.attributes, you meant gBrowser.attributes.
• Using attributes seems very weird, an equivalent to the fixed up version of your code would be gBrowser.setAttribute("value", value) and gBrowser.getAttribute("value")
• The fixed up code still isn’t what you probably need and you didn’t specify what exactly do you need (gBrowser.mCurrentTab.setAttribute?)