Need to Default select an Angular JS Radio Button

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I am new to Angular JS and I am trying to create a set of radio buttons. Creating the buttons was the easy part, but I am having problems figuring out how to default select

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北荒

2021-01-19 01:35
General suggestion, avoid using '{{}}' use ng-bind (This will not related to question, its just good practice )

Use
```
ng-value="true"
```
If you want to control from controller.js then use
```
ng-checked="default_option"
```
and control it in controller.js
```
$scope.default_option = true
```
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心在旅途

2021-01-19 01:39

HTML

<body ng-app="demoApp">
    <!-- ng-init functionality belongs in controller -->
    <div ng-controller="DemoController">
        <!-- move ng-repeat to container div instead of label -->
        <div ng-repeat="price_option in price_options">
            <label>
                <!-- the model is the scope variable holding the selected value -->
                <!-- the value is the value of this particular option -->
                <input type="radio" ng-model="$parent.selected_price_option" ng-value="price_option" name="quantity" />{{price_option.qty_description}}</label>
            <ul>
                <li ng-bind="price_option.price"></li>
                <li ng-bind="price_option.discount"></li>
                <li ng-bind="price_option.deal_value"></li>
            </ul>
        </div>
    </div>
</body>

angular.module('demoApp', []).
controller('DemoController', function ($scope) {
    //moved init logic to controler
    $scope.price_options = [{
        qty: 1,
        price: 10,
        qty_description: 'descrip 1',
        discount: '1%',
        deal_value: 200
    }, {
        qty: 2,
        price: 7,
        qty_description: 'descrip 2',
        discount: '5%',
        deal_value: 100
    }];
    $scope.selected_price_option = $scope.price_options[1];
});

Forked fiddle: http://jsfiddle.net/W8KH7/2/

Or you can use the object strategy to avoid having to reference $parent: http://jsfiddle.net/W8KH7/3/

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爱一瞬间的悲伤

2021-01-19 01:58

Try this approach:

angular.module('demoApp', []).controller('DemoController', function ($scope) {
    $scope.priceOptions = [
        {qty: 1, price: 10, qty_description: 'Descrip 1', discount: '1%', deal_value: 200}, 
        {qty: 2, price: 7, qty_description: 'Descrip 2', discount: '5%', deal_value: 100}
    ];
    $scope.selected = {priceOption: $scope.priceOptions[0]};
});

HTML

<label ng-repeat="priceOption in priceOptions">
    <input type="radio" ng-model="selected.priceOption" ng-value="priceOption" name="quantity" />
    {{ priceOption.qty_description }}
</label>
<ul>
    <li>{{ selected.priceOption.price }}</li>
    <li>{{ selected.priceOption.discount }}</li>
    <li>{{ selected.priceOption.deal_value }}</li>
</ul>

Demo: http://jsfiddle.net/qWzTb/313/

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