How can I make a checkbox checked in AngularJS?

Question

How can I make a checkbox checked in AngularJS?

Hello, I am currently working on a web application using AngularJS. Within this application, I have a form where I am populating values into a multi-select dropdown.

  <li ng-repeat="p in locations">
  <input type="checkbox" ng-checked="master" ng-model="isTrue" ng-change="getIndex(p.Location,isTrue )" ng-name="location" required/>
  <span>{{p.Location}}</span>
  </li>

The values are being bound from an array called 'locations', which looks like:

0:  id: 1  Location:"ABC"
1:  id: 2  Location:"DEF"
2:  id: 3  Location:"IJK"

My current goal is to pre-check specific values within the multi-select dropdown. For example, if I have a variable var locations="ABC,DEF", I want only those values to be checked initially. If you have any insights on how this can be achieved, your assistance would be greatly appreciated. Thank you!

javascript angularjs

Answer 1

Answer №1

Essentially, if we have a string input with the selected locations (e.g.) var destinations = 'ABC,DEF';, we can divide this string by the , character to create an array of locations to compare:

var app = angular.module('myApp', []);

app.controller("locationsController", ["$scope",
    function ($scope) {
        // variables
        var locations = 'ABC,DEF';
    
        // functions
        function initialize() {
            var localities = locations.split(',');
        
            angular.forEach($scope.locations, function (item) {
                if (locations.indexOf(item.Location) > -1) {
                    item.checked = true;
                }
            });
        }
    
        // $scope
        $scope.locations = [
            { id: 1, Location: "ABC" }, 
            { id: 1, Location: "DEF" }, 
            { id: 1, Location: "IJK" }
        ];
        
        // initialization
        initialize();
    }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
   <div ng-controller="locationsController">
      <li ng-repeat="p in locations">
         <input ng-checked="p.checked" type="checkbox" ng-model="p.checked" required/>
         <span>{{ p.Location }}</span>
      </li>
   </div>
</div>

Answer 2

Essentially, if we have a string input with the selected locations (e.g.) var destinations = 'ABC,DEF';, we can divide this string by the , character to create an array of locations to compare:

var app = angular.module('myApp', []);

app.controller("locationsController", ["$scope",
    function ($scope) {
        // variables
        var locations = 'ABC,DEF';
    
        // functions
        function initialize() {
            var localities = locations.split(',');
        
            angular.forEach($scope.locations, function (item) {
                if (locations.indexOf(item.Location) > -1) {
                    item.checked = true;
                }
            });
        }
    
        // $scope
        $scope.locations = [
            { id: 1, Location: "ABC" }, 
            { id: 1, Location: "DEF" }, 
            { id: 1, Location: "IJK" }
        ];
        
        // initialization
        initialize();
    }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
   <div ng-controller="locationsController">
      <li ng-repeat="p in locations">
         <input ng-checked="p.checked" type="checkbox" ng-model="p.checked" required/>
         <span>{{ p.Location }}</span>
      </li>
   </div>
</div>

Answer 3

Answer №2

Here is a suggestion to improve your code. Assign a separate model for each checkbox.

var app = angular.module('myApp', []);

app.controller("Controller", ["$scope",
  function($scope) {
    $scope.locations = [{
      "id": 1,
      Location: "ABC"
    }, {
      "id": 1,
      Location: "DEF"
    }, {
      "id": 1,
      Location: "IJK"
    }]

    var checked = ['ABC','DEF'];
    function init() {
      angular.forEach($scope.locations,function(location){
        if(checked.indexOf(location.Location) != -1){
          location.checked = true;
         }
      })
    }
    init();

  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="Controller">
    <li ng-repeat="p in locations">
      <input type="checkbox" ng-model="p.checked" name="location" required/>
      <span>{{p.Location}}</span>
    </li>
  </div>
</div>

Answer 4

Here is a suggestion to improve your code. Assign a separate model for each checkbox.

var app = angular.module('myApp', []);

app.controller("Controller", ["$scope",
  function($scope) {
    $scope.locations = [{
      "id": 1,
      Location: "ABC"
    }, {
      "id": 1,
      Location: "DEF"
    }, {
      "id": 1,
      Location: "IJK"
    }]

    var checked = ['ABC','DEF'];
    function init() {
      angular.forEach($scope.locations,function(location){
        if(checked.indexOf(location.Location) != -1){
          location.checked = true;
         }
      })
    }
    init();

  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="Controller">
    <li ng-repeat="p in locations">
      <input type="checkbox" ng-model="p.checked" name="location" required/>
      <span>{{p.Location}}</span>
    </li>
  </div>
</div>

Answer 5

Answer №3

Here is a sample code that should be functional:

var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope,$filter) {

  $scope.selectedValue = 'ABC,IJK';
  $scope.selectedValue = $scope.selectedValue.split(',');
 
  $scope.options = [{
    id: 0,
    name: 'ABC'
  }, {
    id: 1,
    name: 'DEF'
  }, {
    id: 2,
    name: 'IJK'
  }];
  $scope.selected = [];
  angular.forEach($scope.selectedValue,function(val,key){
  var r = $filter('filter')( $scope.options, {name: val})[0].id;  
  if(r != undefined){
   $scope.selected[r]=true;
  }else{
   $scope.selected[r]=false;
   }
  
 
  });
  

});

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

<body>

  <div ng-app="myApp" ng-controller="myCtrl">

    <li ng-repeat="p in options">
      <input type="checkbox" ng-model="selected[p.id]" ng-change="getIndex(p.Location,isTrue )" />
      <span>{{p.name}}</span>
    </li>
    Selected : {{selected}}
  </div>

Answer 6

Here is a sample code that should be functional:

var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope,$filter) {

  $scope.selectedValue = 'ABC,IJK';
  $scope.selectedValue = $scope.selectedValue.split(',');
 
  $scope.options = [{
    id: 0,
    name: 'ABC'
  }, {
    id: 1,
    name: 'DEF'
  }, {
    id: 2,
    name: 'IJK'
  }];
  $scope.selected = [];
  angular.forEach($scope.selectedValue,function(val,key){
  var r = $filter('filter')( $scope.options, {name: val})[0].id;  
  if(r != undefined){
   $scope.selected[r]=true;
  }else{
   $scope.selected[r]=false;
   }
  
 
  });
  

});

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

<body>

  <div ng-app="myApp" ng-controller="myCtrl">

    <li ng-repeat="p in options">
      <input type="checkbox" ng-model="selected[p.id]" ng-change="getIndex(p.Location,isTrue )" />
      <span>{{p.name}}</span>
    </li>
    Selected : {{selected}}
  </div>

Answer 7

Answer №4

Give this a try:

<ul ng-repeat="place in areas">
  <input type="checkbox" ng-checked="place.Area == 'XYZ' || place.Area == 'LMN'? true : false" ng-model="place.master" ng-change="findIndex(place.Area, checkStatus )" ng-name="area" required/>
  <span>{{place.Area}}</span>
</ul>

Answer 8

Give this a try:

<ul ng-repeat="place in areas">
  <input type="checkbox" ng-checked="place.Area == 'XYZ' || place.Area == 'LMN'? true : false" ng-model="place.master" ng-change="findIndex(place.Area, checkStatus )" ng-name="area" required/>
  <span>{{place.Area}}</span>
</ul>

Answer 9

Answer №5

Include an additional field checked:"true" in your locations array like so

var app = angular.module('myApp', []);

app.controller("Controller", ["$scope",
  function($scope) {
    $scope.locations = [{id:1,Location:"ABC",checked:"false"},{id:1,Location:"DEF",checked:"true"},{id:1,Location:"IJK",checked:"true"}]

  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="Controller">
    <li ng-repeat="p in locations">
      <input ng-checked="{{p.checked}}" type="checkbox" ng-model="p.id"  name="location" required/>
      <span>{{p.Location}}</span>
    </li>
  </div>
</div>

Answer 10

Include an additional field checked:"true" in your locations array like so

var app = angular.module('myApp', []);

app.controller("Controller", ["$scope",
  function($scope) {
    $scope.locations = [{id:1,Location:"ABC",checked:"false"},{id:1,Location:"DEF",checked:"true"},{id:1,Location:"IJK",checked:"true"}]

  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="Controller">
    <li ng-repeat="p in locations">
      <input ng-checked="{{p.checked}}" type="checkbox" ng-model="p.id"  name="location" required/>
      <span>{{p.Location}}</span>
    </li>
  </div>
</div>

Answer 11

Answer №6

Consider implementing this method to achieve the desired result. You will need to assign a unique ngModel for each checkbox by placing them inside the location object itself.

Sample HTML:

 <li ng-repeat="p in locations">
     <input type="checkbox" ng-checked="master" ng-model="p.isTrue" ng-change="getIndex(p.Location, p.isTrue)" ng-name="location" required/>
     <span>{{p.Location}}</span>
 </li>

In JavaScript:

$scope.locations = [
    {id: 1, Location:"ABC"},
    {id: 2, Location:"DEF"},
    {id: 3, Location:"GHI"}
];
var selectedLocations = "ABC,DEF";
selectedLocations = locations.split(",");
angular.forEach($scope.locations, function(loc){
    loc.isTrue = selectedLocations.indexOf(loc.Location) > -1;
});

Answer 12

Consider implementing this method to achieve the desired result. You will need to assign a unique ngModel for each checkbox by placing them inside the location object itself.

Sample HTML:

 <li ng-repeat="p in locations">
     <input type="checkbox" ng-checked="master" ng-model="p.isTrue" ng-change="getIndex(p.Location, p.isTrue)" ng-name="location" required/>
     <span>{{p.Location}}</span>
 </li>

In JavaScript:

$scope.locations = [
    {id: 1, Location:"ABC"},
    {id: 2, Location:"DEF"},
    {id: 3, Location:"GHI"}
];
var selectedLocations = "ABC,DEF";
selectedLocations = locations.split(",");
angular.forEach($scope.locations, function(loc){
    loc.isTrue = selectedLocations.indexOf(loc.Location) > -1;
});

Answer 13

Answer №7

Add a new element to your array and assign a boolean value of true or false to it.

0: id: 1 Location:"ABC" flag: true
1: id: 2 Location:"DEF" flag: false

<li ng-repeat="p in locations">
    <input type="checkbox" ng-checked="p.flag" ng-model="isTrue" ng-
    change="getIndex(p.Location, isTrue)" ng-name="location" required/>
    <span>{{p.Location}}</span>
</li>

Utilize that flag to toggle the state of your checkbox.

Answer 14

Add a new element to your array and assign a boolean value of true or false to it.

0: id: 1 Location:"ABC" flag: true
1: id: 2 Location:"DEF" flag: false

<li ng-repeat="p in locations">
    <input type="checkbox" ng-checked="p.flag" ng-model="isTrue" ng-
    change="getIndex(p.Location, isTrue)" ng-name="location" required/>
    <span>{{p.Location}}</span>
</li>

Utilize that flag to toggle the state of your checkbox.

How can I make a checkbox checked in AngularJS?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

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