How to get contents of the HEAD element in a DOM

There are two ways to solve the problem.

Use HTMLObject API

First, find the HEAD element with Navigator.Find.

var head = Navigator.Find("//head");

Then use HTMLObject.DoDOMChildrenCount and HTMLObject.DoDOMChildAt to iterate through the child elements.

var cc = head._DoDOMChildrenCount();
for(var i = 0; i < cc; i++)
{
    var c = head._DoDOMChildAt(i);
    // check the child element
    // ...
}
	

HTMLObject properties and HTMLObject.DoDOMGetAttribute help to filter elements  and get href of style sheets.

var tag = c.GetTag();
if (tag.toLowerCase() == "link")
{
    var rel = c._DoDOMGetAttribute("rel");
    if (rel && rel.toLowerCase() == "stylesheet")
    {
        var href = c._DoDOMGetAttribute("href");
        if (href)
        {
            // remember the link
            // ...
        }
    }
}

Note: we use underscore before Do<...> calls to switch off command interval delay.

Here is the complete function that builds an array of CSS references:

function GetCssLinks()
{
    var cssLinks = [];
    var head = Navigator.Find("//head");
    var cc = head._DoDOMChildrenCount();
    for(var i = 0; i < cc; i++)
    {
        var c = head._DoDOMChildAt(i);
        var tag = c.GetTag();
        if (tag.toLowerCase() == "link")
        {
            var rel = c._DoDOMGetAttribute("rel");
            if (rel && rel.toLowerCase() == "stylesheet")
            {
                var href = c._DoDOMGetAttribute("href");
                if (href)
                {
                    cssLinks.push(href);
                }
            }
        }
    }
    return cssLinks;
}

It can be used in JavaScript

var links = GetCssLinks();
for(var i = 0; i < links.length; i++)
{
    Tester.Message(links[i]);
}

and in RVL

Use Navigator.ExecJS

With Navigator.ExecJS it is possible to get the innerHTML of the HEAD element in one line of code

var headHTML =  Navigator.ExecJS('return el.innerHTML;', Navigator.Find("//head"));

Wrap this call into a function

function GetHeadInnerHTML()
{
    var headHTML =  Navigator.ExecJS('return el.innerHTML;', Navigator.Find("//head"));
    return headHTML;
}

and use in JavaScript

var headHTML = GetHeadInnerHTML();
Tester.Message(headHTML);

or RVL

Result of the GetHeadInnerHTML call is HTML contents of the HEAD element

<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<title>
	Inflectra | Library Information System
</title>
<link rel="icon" type="image/x-icon" href="FavIco.ico">
<link rel="shortcut icon" type="image/x-icon" href="FavIco.ico">
<link href="App_Themes/DefaultTheme/DefaultTheme.css" type="text/css" rel="stylesheet">

Then you may process the text to find the links.

var headHTML = GetHeadInnerHTML();
var re = new RegExp("href=\\\"[^\\\"]+\\\"", "gi");
var m = headHTML.match(re);
for(var i = 0; i < m.length; i++)
{
    var link = m[i];
    Tester.Message(m[i]);
}