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    watch-oncepublic

    $watchOnce

    Bower version Code Climate Build Status

    NPM

    This module adds $watchOnce, $watchGroupOnce, and $watchCollectionOnce to angular scopes. Each of these have the same signature as their angular counterparts. The difference is the listener you provide is only called once, and only when the value is defined. Note that for $watchGroupOnce, it will only be called when every expression's value is defined. Also, $watchGroupOnce is only available in Angular >= 1.3. Once your listener has been called, the watcher stops itself from watching.

    To Get

    Get the code on GitHub: index.js | index.min.js

    Or by using bower or npm:

    bower|npm install watch-once

    To Use

    Include it on your page with a script tag (or require it in using commonjs or amd) and add it to your dependencies:

    // CommonJS
    angular.module('app', [require('watch-once')]);
     
    // AMD
    define(['path/to/watch-once/index.js'], function(watchOnce) {
      angular.module('app', [watchOnce]);
    });
     
    // global
    angular.module('app', ['watchOnce']);
     
     
     
    // Then you can do this:
     
    $scope.$watchOnce('expression', function(value) {
      console.log(value); // <-- will only print once and will never be undefined.
    });
     
    // it works in link functions as well (other solutions don't do this).
     
    // you can also use $watchGroupOnce and $watchCollectionOnce

    See the test-runner.js and the demo page (which runs the test runner).

    Angular compatibility

    This is compatible with Angular >= 1.0.0. Note, that older versions only had $watch so only $watchOnce is supported for the older versions.

    install

    npm i watch-once

    Downloadsweekly downloads

    162

    version

    2.0.0

    license

    MIT

    repository

    githubgithub

    last publish

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