Getting a single xml node with javascript

Question

This should be really simple but for some reason I can't seem to get it to work; So I have a XML file as follows:

<board>
     <version>1</version>
<r>
    <c>
        <tile>g</tile>
    </c>

    <c>
        <tile>B</tile>
    </c>
</r>

<r>
    <c>
        <tile>C</tile>
    </c>

    <c>
        <tile>D</tile>
    </c>
</r>
</board>

And some JavaScript like:

    function get_cversion(){
    if (window.XMLHttpRequest) { 
        xmlhttp = new XMLHttpRequest(); 
    } 
    else { 
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
    } 
    xmlhttp.open("GET", "board.XML", false); 
    xmlhttp.send(); 
    xmlDoc = xmlhttp.responseXML;
    var mytext = 0


    var x=xmlDoc.getElementsByTagName("version");
    mytext = (x[0].childNodes[0].nodeValue);
    mytext += "";
    document.frmOne.input1.value = ""+mytext;
}

and last, I have a form on the page like this:

<FORM NAME = frmOne>

    1val: <INPUT TYPE = Text NAME = input1 SIZE = 4 value ="">
    <p>
    <Input Type = Button NAME = b1 VALUE = "Save val" onClick = update_XX()>
    <p> 
    <Input Type = Button NAME = b2 VALUE = "WOOOOO" onClick = get_cversion()>
</FORM>

I'm still really new at this whole XML game. I know I must be missing something really obvious but I just cant see it, any help would be greatly appreciated.

Thanks.

This is enough - assuming that really was your code: document.frmOne.input1.value = (x[0].childNodes[0].nodeValue); — mplungjan
– mplungjan, Commented May 12, 2011 at 17:21

Aravindan R · Accepted Answer · 2011-05-12 15:32:37Z

3

You might want to check the status of the request before processing the XML. Your code should look something like this,

    function get_cversion(){
    if (window.XMLHttpRequest) { 
        xmlhttp = new XMLHttpRequest(); 
    } 
    else { 
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
    } 
    xmlhttp.open("GET", "board.XML", false); 
    xmlhttp.send();                   
         if(xmlhttp.status == 200) {
          var xmlDoc = xmlhttp.responseXML;
          var mytext = 0       
          var x=xmlDoc.getElementsByTagName("version");
          mytext = (x[0].childNodes[0].nodeValue);
          mytext += "";
          document.frmOne.input1.value = ""+mytext;            
      }
}

edited May 12, 2011 at 15:32

answered May 12, 2011 at 15:25

Aravindan R

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2 Comments

tomatosource Over a year ago

Right, so I've added the if and then an else document.frmOne.input1.value = "whoops"; and it is going to the whoops...any ideas why?

tomatosource Over a year ago

BECAUSE IM AN IDIOT: board.xml != board.XML . Sorted. Thanks for the help.

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