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htmldiff-js

v1.0.5

Published

JavaScript port of HtmlDiff.Net which is itself a C# port of HtmlDiff

Downloads

95,977

Readme

JavaScript port of HtmlDiff.NET which is itself a C# port of the Ruby implementation, HtmlDiff.

Project Description

Diffs two HTML blocks, and returns a meshing of the two that includes <ins> and <del> elements. The classes of these elements are ins.diffins for new code, del.diffdel for removed code, and del.diffmod and ins.diffmod for sections of code that have been changed.

For "special tags" (primarily style tags such as <em> and <strong>), ins.mod elements are inserted with the new styles.

Further description can be found at this blog post written by Rohland, the author of HtmlDiff.NET.

Note: The diffing algorithm isn't perfect. One example is that if a new <p> ends in the same string as the previous <p> tag did, two <ins> tags will be created: one starting at the beginning of the common string in the first <p> and one in the second <p> containing all the content up to the point the trailing common string begins. It's a little frustrating, but I didn't write the algorithm (and honestly don't really understand it); I only ported it.

Usage

Html

<html>
<body>
    <div id="oldHtml">
        <p>Some <em>old</em> html here</p>
    </div>

    <div id="newHtml">
        <p>Some <b>new</b> html goes here</p>
    </div>

    <div id="htmlDiff">
    </div>
</body>
</html>

JavaScript

import HtmlDiff from 'htmldiff-js';


let oldHtml = document.getById('oldHtml');
let newHtml = document.getById('newHtml');
let diffHtml = document.getById('diffHtml');

diffHtml.innerHTML = HtmlDiff.execute(oldHtml.innerHTML, newHtml.innerHTML);

Demo

I didn't port the demo, but it should output markup the same way the htmldiff.net demo does with a slight exception in what appeared to me to be a bug, which I 'fixed'. I can no longer remember what that bug was, as I only ported this project quickly in order to use it in another project.