How to check an element with ng-if is visible on DOM ?

Last Updated : 23 Sep, 2021

ng-if directive: The ng-if directive in AngularJS is used to remove or recreate a portion of the HTML element based on an expression. If the expression inside it is false then the element is removed and if it is true then the element is added to the DOM.

Syntax:

<element ng-if="expression"> Contents... </element>

Approach:

Consider a checkoff list made containing three items.
Once all the items are bought then we display a message — “Everything is bought!”.
At starting NG-IF removes this message from a portion of the DOM tree and based on the expression when it gets evaluated as true as it is recreated in DOM.
To observe these changes we are going to inspect the code on Web Browser. Different ways to approach enable Inspect in Google Chrome:
- Menu bar -> More tools -> Developer tools.
- Right Click in the browser -> Inspect
- Ctrl + Shift + I (Windows)
- Cmd + Opt + I (Mac OS)

Note: For more information go to chrome-inspect-element-tool-shortcut.

Code Implementation:

HTML

<!DOCTYPE html>
<html>
 
<head>
    <meta name="viewport" content=
        "width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://www.w3schools.com/w3css/4/w3.css">
    <script type="text/javascript" src=
"https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.0/angular.min.js">
    </script>
</head>
 
<body ng-app="myApp">
    <div ng-controller="myCtrl"
        class="w3-container">
        <h1 align="center" class="w3-text-green">
            GeeksforGeeks
        </h1>
        <h4 align="center" class="w3-text-green">
            A computer science portal for geeks
        </h4>
        <ul>
            <li ng-repeat="item in items">
                Buy {{item.name}} {{item.quantity}}
                <button ng-click=Bought($index) 
                    class="w3-button w3-round w3-border 
                        w3-margin-bottom">
                    Bought
                </button>
            </li>
        </ul>
        <p class="w3-text-red" align="center"
            ng-if="items.length == 0">
            Everything is Bought!
        </p>
 
 
    </div>
    <script type="text/javascript">
        (function () {
            angular.module("myApp", []).controller(
                "myCtrl", function ($scope) {
                $scope.items = [
                    { name: "Milk", quantity: "2 Packet" },
                    { name: "Biscuit", quantity: "10 Packet" },
                    { name: "Bread", quantity: "5 Packet" }
                ];
                $scope.Bought = function (index) {
                    $scope.items.splice(index, 1);
                };
            });
        })();
    </script>
</body>
 
</html>