can-define-backup

can-define.Map.backup is a plugin that provides a dirty bit for properties on an DefineMap, and lets you restore the original values of an DefineMap's properties after they are changed.

Overview

Here is an example showing how to use [can-define.Map.backup.prototype.backup backup] to save values, [can-define.Map.backup.prototype.restore restore] to restore them, and [can-define.Map.backup.prototype.isDirty isDirty]

to check if the Map has changed:

var recipe = new DefineMap({
  title: 'Pancake Mix',
  yields: '3 batches',
  ingredients: [{
    ingredient: 'flour',
    quantity: '6 cups'
  },{
    ingredient: 'baking soda',
    quantity: '1 1/2 teaspoons'
  },{
    ingredient: 'baking powder',
    quantity: '3 teaspoons'
  },{
    ingredient: 'salt',
    quantity: '1 tablespoon'
  },{
    ingredient: 'sugar',
    quantity: '2 tablespoons'
  }]
});
defineBackup(recipe);
recipe.backup();

recipe.title = 'Flapjack Mix';
recipe.title;     // 'Flapjack Mix'
recipe.isDirty(); // true

recipe.restore();
recipe.title;     // 'Pancake Mix'

Usage

ES6 use

With StealJS, you can import this module directly in a template that is autorendered:

import defineBackup from 'can-define-backup';

CommonJS use

Use require to load can-define-backup and everything else needed to create a template that uses can-define-backup:

var defineBackup = require("can-define-backup");

AMD use

Configure the can and jquery paths and the can-define-backup package:

<script src="require.js"></script>
<script>
	require.config({
	    paths: {
	        "jquery": "node_modules/jquery/dist/jquery",
	        "can": "node_modules/canjs/dist/amd/can"
	    },
	    packages: [{
		    	name: 'can-define-backup',
		    	location: 'node_modules/can-define-backup/dist/amd',
		    	main: 'lib/can-define-backup'
	    }]
	});
	require(["main-amd"], function(){});
</script>

Standalone use

Load the global version of the plugin:

<script src='./node_modules/can-define-backup/dist/global/can-define-backup.js'></script>

Contributing

Making a Build

To make a build of the distributables into dist/ in the cloned repository run

npm install
node build

Running the tests

Tests can run in the browser by opening a webserver and visiting the test.html page. Automated tests that run the tests from the command line in Firefox can be run with

npm test