Substring text with HTML tags in Javascript

Question

Do you have solution to substring text with HTML tags in Javascript?

For example:

var str = \'Lorem ipsum dolor sit         


        

Answer 1

Usage:

var str = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.';

var res1 = html_substr( str, 20 );
var res2 = html_substr( str, 30 );

alert( res1 ); // Lorem ipsum dolor si
alert( res2 ); // Lorem ipsum dolor sit amet, co

Example: http://jsfiddle.net/2ULbK/4/

---

Function:

function html_substr( str, count ) {

    var div = document.createElement('div');
    div.innerHTML = str;

    walk( div, track );

    function track( el ) {
        if( count > 0 ) {
            var len = el.data.length;
            count -= len;
            if( count <= 0 ) {
                el.data = el.substringData( 0, el.data.length + count );
            }
        } else {
            el.data = '';
        }
    }

    function walk( el, fn ) {
        var node = el.firstChild;
        do {
            if( node.nodeType === 3 ) {
                fn(node);
                    //          Added this >>------------------------------------<<
            } else if( node.nodeType === 1 && node.childNodes && node.childNodes[0] ) {
                walk( node, fn );
            }
        } while( node = node.nextSibling );
    }
    return div.innerHTML;
}