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XML DOM substringData() Method

❮ Comment Object

Example

The following code fragment loads "books_comment.xml" into xmlDoc and gets the "(Hardcover)" string form the first comment element:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
       myFunction(this);
   }
};
xhttp.open("GET", "books_comment.xml", true);
xhttp.send();

function myFunction(xml) {
    var x, i, y, txt, xmlDoc;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.getElementsByTagName("book")[0].childNodes;
    for (i = 0; i < x.length; i++) {
    // Process only comment nodes
        if (x[i].nodeType == 8) {
            y = x[i].substringData(33, 11);
            txt += y + "<br>";
        }
    }
    document.getElementById("demo").innerHTML = txt;
}

Output:

(Hardcover)
Try it Yourself »

In the example above we use a loop and an if-test to make sure we only process comment nodes. A comment node has a node type of 8.

Definition and Usage

The substringData() method gets a string from the comment node.

Syntax

substringData(start,length)

Parameter Description
start Required. Specifies where to begin extracting characters. Start value starts at zero
length Required. Specifies how many characters to extract
❮ Comment Object