Extracting data from XPath results reveals information beyond just the elements themselves

Having trouble using the getElementsByXPath function in CasperJS to return a specific string from an xpath I determined. Despite my efforts, it seems like the function is only returning data for the entire webpage instead of the desired string.

var casper = require('casper').create({
verbose: false,
logLevel: 'debug'
});
casper.userAgent("Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)     Chrome/28.0.1500.72 Safari/537.36");
casper.start();
casper.thenOpen('http://www.uky.edu', function(){
    content = casper.evaluate(function () {
       return __utils__.getElementsByXPath('//div[@id=\'container\']/section[@id=\'content\']/aside[@class=\'socialTab clearfix\']/div[@id=\'usual2\']/div[@id=\'tabs1\']/figure[@class=\'youTube\']/h4/a');
   });
});

casper.run(function() {
    this.echo(JSON.stringify(content)); 
    this.echo('completed').exit();
});

I even tested this on a simple webpage with just one div and encountered the same issue when using the xpath //div -- resulting in a lengthy output that did not match what I was looking for.

[{"align":"","attributes":{"length":0},"baseURI":"http://download2012.ad.uky.edu/caspertest.php","childElementCount":0,"childNodes":{"0":null,"length":1},"child
ren":{"length":0},"classList":{"length":0},"className":"","clientHeight":20,"cli
entLeft":0,"clientTop":0,"clientWidth":384,"contentEditable":"inherit","dataset"
:{},"dir":"","draggable":false,"firstChild":null,"firstElementChild":"","hidden"
:false,"id":"","innerHTML":"Test2","innerText":"Test2","isContentEditable":false
,"lang":"","lastChild":{"attributes":"","baseURI":"http://download2012.ad.uky.ed
u/caspertest.php","childNodes":{"length":0},"data":"Test2","firstChild":"","last
Child":"","length":5,"localName":"","namespaceURI":"","nextSibling":"","nodeName
":"#text","nodeType":3,"nodeValue":"Test2","ownerDocument":null,"parentElement":
null,"parentNode":null,"prefix":"","previousSibling":"","textContent":"Test2","w
holeText":"Test2"},"lastElementChild":"","localName":"div","namespaceURI":"http:
//www.w3.org/1999/xhtml","nextElementSibling":"","nextSibling":null,"nodeName":"
DIV","nodeType":1,"nodeValue":"","offsetHeight":20,"offsetLeft":8,"offsetParent"
:{"aLink":"","attributes":{"length":0},"background":"","baseURI":"http://downloa
d2012.ad.uky.edu/caspertest.php","bgColor":"","childElementCount":1,"childNodes"
:{"0":null,"1":null,"2":null,"length":3},"children":{"0":null,"length":1},"class
List":{"length":0},"className":"","clientHeight":300,"clientLeft":0,"clientTop":
0,"clientWidth":400,"contentEditable":"inherit","dataset":{},"dir":"","draggable
":false,"firstChild":{"attributes":"","baseURI":"http://download2012.ad.uky.edu/
caspertest.php","childNodes":{"length":0},"data":"Test\n","firstChild":"","lastC
hild":"","length":5,"localName":"","namespaceURI":"","nextSibling":null,"nodeNam
e":

The issue persists, causing frustration as the expected string remains elusive in the returned data.

Answer №1

In CasperJS, it is not possible to return DOM elements from the page context directly. If you use document.querySelectorAll instead of __utils__.getElementsByXPath with a modified CSS selector, the result will be an array of undefined values. This behavior does not occur when using __utils__.getElementsByXPath. The snapshots of DOM elements returned are partially serializable but contain circular references to the document and may lead to continuous growth.

The official documentation states:

Please note: The arguments and return value for the evaluate function must be simple primitive objects. As a rule of thumb, if it can be serialized via JSON, then it's acceptable.

Closures, functions, DOM nodes, etc. will not work!

To achieve what you need within the page context, consider treating the element as a string:

content = casper.evaluate(function () {
   return __utils__.getElementByXPath(someSelector).outerHTML;
});

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