Thomas Owens Thomas Owens - 2 years ago 100
Javascript Question

Is there a JavaScript solution to generating a "table of contents" for a page?

I have headers in

tags. Is there a way that I can use JavaScript to generate a table of contents for the contents that serves as anchor tags as well?

I would like the output to be something like:

<li>Header 1</li>
<li>Header 1</li>
<li>Header 2</li>
<li>Header 3</li>

I am not currently using a JavaScript framework, but I don't see why I couldn't use one.

I am also looking for something done, since I'm guessing this is a common problem, but if not, a starting point to roll my own would be good.

Answer Source

I couldn't resist putting together a quick implementation.

Add the following script anywhere on your page:

window.onload = function () {
    var toc = "";
    var level = 0;

    document.getElementById("contents").innerHTML =
            function (str, openLevel, titleText, closeLevel) {
                if (openLevel != closeLevel) {
                    return str;

                if (openLevel > level) {
                    toc += (new Array(openLevel - level + 1)).join("<ul>");
                } else if (openLevel < level) {
                    toc += (new Array(level - openLevel + 1)).join("</ul>");

                level = parseInt(openLevel);

                var anchor = titleText.replace(/ /g, "_");
                toc += "<li><a href=\"#" + anchor + "\">" + titleText
                    + "</a></li>";

                return "<h" + openLevel + "><a name=\"" + anchor + "\">"
                    + titleText + "</a></h" + closeLevel + ">";

    if (level) {
        toc += (new Array(level + 1)).join("</ul>");

    document.getElementById("toc").innerHTML += toc;

Your page should be structured something like this:

    <div id="toc">
        <h3>Table of Contents</h3>
    <div id="contents">
        <h2>Red Fruits</h2>
        <h2>Orange Fruits</h2>
        <h2>Vegetables Which Are Actually Fruits</h2>

You can see it in action at (Works in IE, FF, Safari, Opera)

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