hyperjson

An abstract datatype compatible with the hyperscript API.

What's hyperscript?

Hyperscript is everything you need to know about a dom element to be able to recreate it. Instead of writing <h1>Hello!</h1> you write h('h1', 'Hello!').

Hyperscript works clientside and serverside, and there are now several other projects adhering to the same API.

What's hyperjson?

Hyperjson is an abstraction of the data component (the arguments passed to the h function) from the function itself. It is intended to be used clientside.

It provides two functions:

fromDOM(domElement[, predicate, filter])

Accepts any DOM element and returns JSON (HyperJSON) representing all the relevant attributes of that DOM element and its children.

fromDOM accepts two optional arguments, both of which are functions:

predicate(DOMElement)

If you provide this function, fromDOM will call it for every element which it will attempt to serialize. If the predicate returns a truthy value, it will proceed to serialize it and its children. If the predicate returns a falsey value, it will terminate.

var hj = Hyperjson.fromDOM(document.body, function (el) {
    // suppose you don't want to serialize h4 elements or their children
    return el.tagName !== 'H4';
});

filter(hyperjson)

After having serialized the tree, but before returning the results, fromDOM will run the contents through filter. At this point, you are free to modify the hyperjson in any way, adding/removing/modifying elements as necessary for your purposes.

Anything that you don't want serialized should be filtered here.

var hj = Hyperjson.fromDOM(document.body, null, function (h) {
    // suppose you want to serialize 'STRIKE' as 'S' elements
    if (h[0] === 'STRIKE') {
        // this will replace <STRIKE> recursively
        h[0] === 'S';
    }
    return h;
});

callOn(hyperJSON, callback)

Accepts valid hyperjson and a callback which adheres to the Hyperscript API:

function myCallback (tagType, attributes, children) {
    /* your code here */
};

The most prominent examples of callbacks are hyperscript and virtual-hyperscript, which produce DOM elements or virtual-DOM elements, respectively.

You can create custom plugins for filtering or modifying elements, or for producing alternative data structures that adhere to a similar structure.

License

This library is currently licensed as LGPL-2.1. Previous versions of this library (v1.4.0 and below) were licensed as AGPL-3.0.