xpath - JavaScript on IE9. XMLDOM.selectSingleNode gives Unknown method -->concat - Stack Overflow

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Why is this code giving me the following error on IE: "Unknown Method. //author[@select = -->concat('tes'<--,'ts')]?

function a()
{
    try
    {
        var xml ='<?xml version="1.0"?><book><author select="tests">blah</author></book>';


        var doc = new ActiveXObject("Microsoft.XMLDOM");
        doc.loadXML(xml);

        node = doc.selectSingleNode("//author[@select = concat('tes','ts')]");
        if(node == null)
        {
            alert("Node is null");
        }
        else
        {
            alert("Node is NOT null");
        }
    } catch(e)
    {
        alert(e.message);
    }
}

Why is this code giving me the following error on IE: "Unknown Method. //author[@select = -->concat('tes'<--,'ts')]?

function a()
{
    try
    {
        var xml ='<?xml version="1.0"?><book><author select="tests">blah</author></book>';


        var doc = new ActiveXObject("Microsoft.XMLDOM");
        doc.loadXML(xml);

        node = doc.selectSingleNode("//author[@select = concat('tes','ts')]");
        if(node == null)
        {
            alert("Node is null");
        }
        else
        {
            alert("Node is NOT null");
        }
    } catch(e)
    {
        alert(e.message);
    }
}

• javascript
• xpath

Share Improve this question Follow asked May 9, 2012 at 18:46 AbdulAbdul 41977 silver badges1515 bronze badges 1

• Please fix your error message so that it's legible. Is concat a function? – Madbreaks Commented May 9, 2012 at 18:49

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 5

Well Microsoft.XMLDOM is an antiquated programming id and you end up with an old MSXML version that by default does not support XPath 1.0 but rather an old, never standardized draft version. These days MSXML 6 is part of any OS or OS with latest service pack that Microsoft supports so simply consider to use an MSXML 6 DOM document with e.g.

        var xml ='<?xml version="1.0"?><book><author select="tests">blah</author></book>';

  var doc = new ActiveXObject("Msxml2.DOMDocument.6.0");
  doc.loadXML(xml);

        node = doc.selectSingleNode("//author[@select = concat('tes','ts')]");
        if(node == null)
        {
            alert("Node is null");
        }
        else
        {
            alert("Node is NOT null");
        }

If you insist on using Microsoft.XMLDOM then call doc.setProperty("SelectionLanguage", "XPath") before any selectSingleNode or selectNodes calls trying to use XPath 1.0.

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