XML DOM replaceData() Method

Comment Object

Definition and Usage

replaceData() Method to replace data in a comment node.

Syntax

commentNode.replaceData(start,length,string)
Parameter Description
start Required. Specifies the position at which to start replacing characters. The starting position is zero.
length Required. Specifies the number of characters to be replaced.
string Required. Specifies the string to be inserted.

Example

The following code loads "books_comment.xml" into xmlDoc and replaces "Simple" with "Easy" in the comment node of the first <book> 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, 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) {
            x[i].replaceData(4, 6, "Easy");
            txt += x[i].data + "<br>";
        }
    }
    document.getElementById("demo").innerHTML = txt;
}

Try It Yourself

In the above example, we used loops and if test statements to ensure that we only handle comment nodes. The node type of comment nodes is 8.

Comment Object