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How do I bind to list of checkbox values with AngularJS?

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天涯浪人
天涯浪人 2020-11-22 05:20

I have a few checkboxes:
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29条回答
  • 梦毁少年i
    2020-11-22 06:06

    Inspired from Yoshi's post above. Here is the plnkr.

    (function () {
   
   angular
      .module("APP", [])
      .controller("demoCtrl", ["$scope", function ($scope) {
         var dc = this
         
         dc.list = [
            "Selection1",
            "Selection2",
            "Selection3"
         ]

         dc.multipleSelections = []
         dc.individualSelections = []
         
         // Using splice and push methods to make use of 
         // the same "selections" object passed by reference to the 
         // addOrRemove function as using "selections = []" 
         // creates a new object within the scope of the 
         // function which doesn't help in two way binding.
         dc.addOrRemove = function (selectedItems, item, isMultiple) {
            var itemIndex = selectedItems.indexOf(item)
            var isPresent = (itemIndex > -1)
            if (isMultiple) {
               if (isPresent) {
                  selectedItems.splice(itemIndex, 1)
               } else {
                  selectedItems.push(item)
               }
            } else {
               if (isPresent) {
                  selectedItems.splice(0, 1)
               } else {
                  selectedItems.splice(0, 1, item)
               }
            }
         }
         
      }])
   
})()
    label {
  display: block;  
}
    <!DOCTYPE html>
<html>

   <head>
      <link rel="stylesheet" href="style.css" />
   </head>

   <body ng-app="APP" ng-controller="demoCtrl as dc">
      <h1>checkbox-select demo</h1>
      
      <h4>Multiple Selections</h4>
      <label ng-repeat="thing in dc.list">
         <input 
            type="checkbox" 
            ng-checked="dc.multipleSelections.indexOf(thing) > -1"
            ng-click="dc.addOrRemove(dc.multipleSelections, thing, true)"
         > {{thing}}
      </label>
      
      <p>
         dc.multipleSelections :- {{dc.multipleSelections}}
      </p>
      
      <hr>
      
      <h4>Individual Selections</h4>
      <label ng-repeat="thing in dc.list">
         <input 
            type="checkbox" 
            ng-checked="dc.individualSelections.indexOf(thing) > -1"
            ng-click="dc.addOrRemove(dc.individualSelections, thing, false)"
         > {{thing}}
      </label>
      
      <p>
         dc.invidualSelections :- {{dc.individualSelections}}
      </p>
      
      <script data-require="jquery@3.0.0" data-semver="3.0.0" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.js"></script>
      <script data-require="angular.js@1.5.6" data-semver="1.5.6" src="https://code.angularjs.org/1.5.6/angular.min.js"></script>
      <script src="script.js"></script>
   </body>

</html>

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  • 無奈伤痛
    2020-11-22 06:06

    A simple HTML only way of doing it:

    <input type="checkbox"
       ng-checked="fruits.indexOf('apple') > -1"
       ng-click="fruits.indexOf('apple') > -1 ? fruits.splice(fruits.indexOf('apple'), 1) : fruits.push('apple')">
<input type="checkbox"
       ng-checked="fruits.indexOf('orange') > -1"
       ng-click="fruits.indexOf('orange') > -1 ? fruits.splice(fruits.indexOf('orange'), 1) : fruits.push('orange')">
<input type="checkbox"
       ng-checked="fruits.indexOf('pear') > -1"
       ng-click="fruits.indexOf('pear') > -1 ? fruits.splice(fruits.indexOf('pear'), 1) : fruits.push('pear')">
<input type="checkbox"
       ng-checked="fruits.indexOf('naartjie') > -1"
       ng-click="fruits.indexOf('apple') > -1 ? fruits.splice(fruits.indexOf('apple'), 1) : fruits.push('naartjie')">

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  • 南笙
    2020-11-22 06:07

    You don't have to write all that code. AngularJS will keep the model and the checkboxes in sync simply by using ngTrueValue and ngFalseValue

    Codepen here: http://codepen.io/paulbhartzog/pen/kBhzn

    Code snippet:

    <p ng-repeat="item in list1" class="item" id="{{item.id}}">
  <strong>{{item.id}}</strong> <input name='obj1_data' type="checkbox" ng-model="list1[$index].data" ng-true-value="1" ng-false-value="0"> Click this to change data value below
</p>
<pre>{{list1 | json}}</pre>
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  • 深忆病人
    2020-11-22 06:07

    Take a look this: checklist-model.

    It works with JavaScript arrays, and objects and it can use static HTML checkboxes, without ng-repeat

    <label><input type="checkbox" checklist-model="roles" value="admin"> Administrator</label>
<label><input type="checkbox" checklist-model="roles" value="customer"> Customer</label>
<label><input type="checkbox" checklist-model="roles" value="guest"> Guest</label>
<label><input type="checkbox" checklist-model="roles" value="user"> User</label>

    And the JavaScript side:

    var app = angular.module("app", ["checklist-model"]);
app.controller('Ctrl4a', function($scope) {
    $scope.roles = [];
});
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  • 萌比男神i
    2020-11-22 06:08

    Using a string of $index can help to use a hashmap of selected values:

    <ul>
    <li ng-repeat="someItem in someArray">
        <input type="checkbox" ng-model="someObject[$index.toString()]" />
    </li>
</ul>

    This way the ng-model object gets updated with the key representing the index.

    $scope.someObject = {};

    After a while $scope.someObject should look something like:

    $scope.someObject = {
     0: true,
     4: false,
     1: true
};

    This method won't work for all situations, but it is easy to implement.

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  • 攒了一身酷
    2020-11-22 06:09

    Check out this directive that manages effectively lists of checkboxes. I hope it works for you. CheckList Model

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