AngularJS How would it be possible to update all radio button values to false when one is selected as true?
Question
I'm pulling in from database separate true/false string values. The example that I'm giving is only to illustrate what I'm getting from database in reality that is a string value of either true or false I can't change this.
What I would like to do is have a single radio button display their value as selected if true and not selected if false.
This bit works fine in my answer below, however when a user selects a different button I would like to make that value 'true' and set all the others as 'false'.
I have tried all sorts of ways including ng-checked but that doesn't work with ng-model. I find radio buttons very confusing in angularJS, please could anybody help me to understand what it is that I'm supposed to be doing? Thankyou
<!doctype html>
<html ng-app="sample" >
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Test</title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="app/bootstrap/css/bootstrap.css">
<link rel="stylesheet" href="app/css/style.css">
<script src="node_modules/jquery/dist/jquery.min.js"></script>
<script src="app/bootstrap/js/bootstrap.min.js"></script>
<script src="node_modules/angular/angular.js"></script>
<script>
var MyApp = angular.module('sample', []);
MyApp.controller('MainCtrl', function($scope) {
$scope.red = 'true';
$scope.yellow = 'false';
$scope.blue = 'false';
$scope.green = 'false';
$scope.orange = 'false';
$scope.purple = 'false';
$scope.black = 'false';
$scope.pink = 'false';
$scope.white = 'false';
});
</script>
</head>
<body ng-controller="MainCtrl">
<div class="container" ><!-- ng-repeat="x in alien.colours" -->
<h3>What colour alien are you?</h3>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="red" />
<label>Red</label> Value is {{red}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="yellow" />
<label>Yellow</label> Value is {{yellow}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="blue" />
<label>Blue</label> Value is {{blue}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="green" />
<label>Green</label> Value is {{green}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="orange" />
<label>Orange</label> Value is {{orange}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="purple" />
<label>Purple</label> Value is {{purple}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="black" />
<label>Black</label> Value is {{black}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="pink" />
<label>Pink</label> Value is {{pink}}<br>
<input type="radio" name="AliCol" ng-value="'true'" ng-model="white" />
<label>White</label> Value is {{white}}<br>
</div>
</body>
</html>
Below is whats happening when you select a different button the values are updated to 'true' button but cant be set to 'false'
2 answers
solution1
2 2018-06-03 20:23:51
One way of doing this (a very basic one, that could be improved a lot!) is using an array of objects to do the job for you.
Fiddle: https://jsfiddle.net/t3t6kueL/
In your Javascript, you could do this:
var MyApp = angular.module('sample', []);
MyApp.controller('MainCtrl', function($scope) {
$scope.colors = [{
name: 'Red', // name => For presentation
value: 'false' // value => For toggling the group's values
},
{
name: 'Yellow',
value: 'false'
},
{
name: 'Blue',
value: 'false'
},
{
name: 'Green',
value: 'false'
},
{
name: 'Orange',
value: 'false'
},
{
name: 'Purple',
value: 'false'
},
{
name: 'Black',
value: 'false'
},
{
name: 'Pink',
value: 'false'
},
{
name: 'White',
value: 'false'
},
]
// Expose a method to change the group's values
$scope.selectColor = function(selectedColorName) {
// Loop through all of the colors
$scope.colors.forEach(function(color) {
// If this is what's being set, then set this to true
// Note: If there are two different objects, with the same name, you will end up with 2 true values here...
if (color.name === selectedColorName) {
color.value = 'true';
// For all the others, set it to false
} else {
color.value = 'false';
}
});
}
});
This would allow you to move the logic and handling what to present to the application's code, making your HTML a bit leaner, as in:
<div class="container">
<h3>What colour alien are you?</h3>
<div ng-repeat="color in colors">
<input type="radio" name="AliCol" ng-click="selectColor(color.name)" />
<label>{{color.name}}</label> Value is {{color.value}}<br>
</div>
</div>
solution2
1 2018-06-03 20:15:08
Use a single value to represent the user's selection. See the snippet below for a working example, and see the docs for more info.
var MyApp = angular.module("sample", []) MyApp.controller("MainCtrl", function($scope) { $scope.alienColor = "blue" // set the initial value here })
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.0/angular.min.js"></script> <div ng-app="sample" ng-controller="MainCtrl"> <div class="container"> <!-- ng-repeat="x in alien.colours" --> <h3>What colour alien are you?</h3> <input type="radio" name="AliCol" value="red" ng-model="alienColor" /> <label>Red</label> Value is {{red}} <br> <input type="radio" name="AliCol" value="yellow" ng-model="alienColor" /> <label>Yellow</label> Value is {{yellow}} <br> <input type="radio" name="AliCol" value="blue" ng-model="alienColor" /> <label>Blue</label> Value is {{blue}} <br> <input type="radio" name="AliCol" value="green" ng-model="alienColor" /> <label>Green</label> Value is {{green}} <br> <input type="radio" name="AliCol" value="orange" ng-model="alienColor" /> <label>Orange</label> Value is {{orange}} <br> <input type="radio" name="AliCol" value="purple" ng-model="alienColor" /> <label>Purple</label> Value is {{purple}} <br> <input type="radio" name="AliCol" value="black" ng-model="alienColor" /> <label>Black</label> Value is {{black}} <br> <input type="radio" name="AliCol" value="pink" ng-model="alienColor" /> <label>Pink</label> Value is {{pink}} <br> <input type="radio" name="AliCol" value="white" ng-model="alienColor" /> <label>White</label> Value is {{white}} <br> </div> {{ alienColor }} </div>
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