Hackernoon logoOffline web pages by persisting DOM to IndexedDB/WebSQL. by@unbug

Offline web pages by persisting DOM to IndexedDB/WebSQL.

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@unbugunbug

Senior Software Engineer

DOMSnap

Offline web pages by persisting DOM to IndexedDB/WebSQL. Please try the demo.

How it works

HTML5 provides LocalStorage, IndexedDB, and window.caches to build offline web apps. But all of these technologies, we can’t miss local database. DOMSnap takes full advantage of offline technologies. Storing HTML to local IndexedDB/WebSQL and resumeing when you’re offline. With DOMSnap, web pages can resume to their last state with less request to the server and less template render. Think offline is a long way out, why not just give DOMSnap a try?

Usage

1.Include dist/DOMSnap.min.js file in your HTML

<script src="DOMSnap.min.js"></script>

2.Or insttall the package

npm install --save domsnap

and require it in your files

var DOMSnap = require('domsnap');

Examples

//init DOMSnap
var DS = DOMSnap({
onReady: function(){
console.log('DOMSnap is ready');
}
});
//capture snapshot html of #main
DS.capture('#main');
//capture with specified capture id
DS.capture('#main', {id: 'my_id'});
//set the html of #main by it's captured snapshot html
DS.resume('#main');
//set by specified capture id
DS.resume('#main',{id: 'my_id'});

APIs

DOMSnap(config)

Initialize DOMSnap

Parameters

  • config object [optional]
  • config.onReady function will be called when DOMSnap is ready
  • config.version number Version control, Nonzero. Update is required if web app has been updated. Default is 1
  • config.scope string "host|path|or any string value". "host": location.host; "path": location.host+location.pathname; default is "path"
  • config.storeType string Data store to use. "IndexedDB" or "WebSQL", if not defined, use "WebSQL" for iOS and "IndexedDB" for others.
  • config.expires number Milliseconds of how long every snapshot will expires, default is 1 week. Note, new snapshots will never expires until the page reload.

Returns object {{capture: capture, resume: resume, get: get, getAll: getAll, remove: remove, clear: clear}|*}

.capture(selector, options)

capture snapshot html of the element matches the selector and store the result with a capture id

Parameters

  • selector string selector of the element
  • options object [optional]
  • options.id string or function capture id, if html is not null set id to null to store html as the default snapshot
  • options.html string or function snapshot html, set id to null to store html as the default snapshot
  • options.expires number Milliseconds of how long the snapshot will expires. Same value as initialize DOMSnap if it's not specified.

Returns DOMSnap

.resume(selector, options)

set the html of the element matches the selector [and capture id] by it’s captured snapshot html

Parameters

  • selector string selector of the element
  • options object [optional]
  • options.id string or function capture id, if html is not null set id to null to store html as the default snapshot
  • options.fallback function a callback function, will be called if no snapshot matched

Returns DOMSnap

.watch(selector, options)

watch and auto capture the element matches the selector

Parameters

  • selector string or array selector[s] of the element[s]
  • options object [optional]
  • options.id string or function capture id
  • options.html string or function snapshot html

Examples

//e.g.1
DS.watch('#main');
//e.g.2
DS.watch('#main',{
id: 'my_capture_id',//capture id
html: 'my_snapshot_html'//snapshot html
});
//e.g.3
DS.watch('#main',{
id: function(selector){ return 'generated_capture_id_for_'+selector;}, //return capture id
html: function(selector){ return 'generated_snapshot_html_for_'+selector;} //return snapshot html
});
//e.g.4
DS.watch(['#main', '#another']);//watch multi elements

Returns DOMSnap

.get(selector, id)

retrun the captured snapshot html of the element matches the selector and capture id

Parameters

  • selector string selector of the element
  • id string [optional]capture id, the result be the default snapshot if it's not specified

Returns string html

.getAll(selector)

retrun all the captured snapshots html of the element matches the selector

Parameters

  • selector string selector of the element

Returns object all snapshots as object — e.g. {DEFAULT_CAPTURE_ID: ‘html of DEFAULT_CAPTURE’, my_id: ‘html of my_id’}

.remove(selector, id)

remove the captured snapshot html of the element matches the selector [and capture id]

Parameters

  • selector string selector of the element
  • id string [optional]capture id, will empty all snapshots if it's not specified

Returns DOMSnap

.clear(version)

clear all captured snapshots

Parameters

  • version number [optional]Same value as initialize DOMSnap if it's not specified.

Returns DOMSnap

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