Which XPath version is supported in PhantomJS?

Question

I'm using Selenium with PhantomJS. How can I find out which version of XPath is used in PhantomJS?

Answer 1

You can directly check whether specific functions are supported or not. For example, boolean() is provided by XPath 1.0, but abs() is only provided by XPath 2.0.

PhantomJS 1.x & 2.0 only supports XPath 1.0.

Full script:

var page = require('webpage').create();

console.log(JSON.stringify(page.evaluate(function(){
    var b = -1, body = -1, abs = -1;
    try{
        b = document.evaluate("boolean('a')", document, null, XPathResult.BOOLEAN_TYPE, null).booleanValue;
    }catch(e){}
    try{
        body = !!document.evaluate("//body", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
    }catch(e){}
    try{
        abs = document.evaluate("abs(-10.5)", document, null, XPathResult.NUMBER_TYPE, null).numberValue;
    }catch(e){}
    return {
        "boolean": b,
        "body": body,
        "abs(-10.5)": abs,
    };
}), undefined, 4));
phantom.exit();

Output:

{
    "abs(-10.5)": -1,
    "body": true,
    "boolean": true
}