sharic19 sharic19 - 2 months ago 16
Javascript Question

AngularJS push item to first or 0 index of $scope array

Please help me implement this function. I have an array of items in my

$scope
. Now, when I click on the Add Item button, I want to push a new item to the first index or 0 index of that array. Thanks in advance. :)

Here's a working jsFiddle to start with: http://jsfiddle.net/limeric29/7FH2e/

HTML:

<div ng-controller="Ctrl">
{{data}}<br/>
<input type="button" ng-click="addItem()" value="Add Item" />
</div>


JavaScript:

function Ctrl($scope) {
$scope.data = [
new String('Item 5'), new String('Item 4'), new String('Item 3'), new String('Item 2'), new String('Item 1')];

$scope.addItem = function () {
var c = $scope.data.length + 1;
var item = new String('Item ' + c)
$scope.data.push(item);
};
}

Answer

Solved my problem by using splice() instead of push() and assigning to what array index to insert.

HTML:

<div ng-controller="Ctrl">
    <pre>{{data}}</pre><br/>
    <input type="button" ng-click="addItem()" value="Add Item" />
</div>

Javascript:

function Ctrl($scope) {
    $scope.data = [
    new String('Item 4'), new String('Item 3'), new String('Item 2'), new String('Item 1')];

    $scope.addItem = function () {
        var c = $scope.data.length + 1;
        var item = new String('Item ' + c)
        $scope.data.splice(0, 0, item);
    };
}

Here's the updated fiddle for this. http://jsfiddle.net/limeric29/xvHNe/