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

Question

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);
    };
}

Mit Mehta · Accepted Answer · 2015-02-17 00:20:56Z

31

You can use the unshift function.

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 item = new String('Item ' + c)
    $scope.data.unshift(item);
};
}

answered Feb 17, 2015 at 0:20

Mit Mehta

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1 Comment

João Martins Over a year ago

This is the best and simpler approach!

sharic19 · Accepted Answer · 2013-07-24 06:52:22Z

29

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/

answered Jul 24, 2013 at 6:52

sharic19

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1 Comment

Eduard Gamonal Over a year ago

you can also use unshift. it's a common way of preppending elements to an array.

WtFudgE · Accepted Answer · 2016-09-28 15:33:17Z

18

$scope.data.unshift(item);

One line, not sure why the others made it so difficult

answered Sep 28, 2016 at 15:33

WtFudgE

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Comments

Nongthonbam Tonthoi · Accepted Answer · 2016-10-13 17:55:25Z

0

Try this:

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.push(item);
    };
}

edited Oct 13, 2016 at 17:55

Nongthonbam Tonthoi

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answered Jul 7, 2015 at 4:39

pal

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Comments

Abdurrahim Akpınar · Accepted Answer · 2017-08-09 09:12:33Z

0

I think, not necessary this operation. You can solve it like this;

<div ng-controller="Ctrl">
    <!-- "$index" is short parameter, "true" statment is reverse parameter -->
    {{data | reverse:$index:true}}<br/>
    <input type="button" ng-click="addItem()" value="Add Item" />
</div>

answered Aug 9, 2017 at 9:12

Abdurrahim Akpınar

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