Showing a notification message in AngularJS when an object is empty within a repeating element

Question

Showing a notification message in AngularJS when an object is empty within a repeating element

Currently, I am utilizing AngularJS along with a repeater to cycle through some search results while also implementing a filter for searching purposes.

There are two specific scenarios that I need to address effectively and I am eagerly seeking the most "angular" approach to handle them.

The initial scenario is when there are no search results to display at the start.

The second scenario occurs when the filter is applied, but no search results are returned.

Upon browsing through this resource, I came across a potential solution that could work by creating separate directives for each scenario. However, I am curious to know if there is a way to manage these conditions using native angular directives without requiring additional coding in the controller.

Thank you!

javascript angularjs

Answer 1

Answer №1

To dynamically display different HTML based on the length of a filtered array, you can utilize the ngSwitch directive in AngularJS.

For a live example, check out this jsFiddle.

Here's the HTML code:

<div ng-app ng-controller="Ctrl">
Search: <input ng-model="searchText">
<div ng-init="filtered = (friends | filter:searchText)">
    <div>{{(friends | filter:searchText).length}}</div>
    <div ng-switch="(friends | filter:searchText).length">
        <span ng-switch-when="0">Nothing was found</span>
        <table id="searchTextResults" ng-switch-default>
            <tr>
                <th>Name</th>
                <th>Phone</th>
            </tr>
            <tr ng-repeat="friend in filtered | filter:searchText">
                <td>{{friend.name}}</td>
                <td>{{friend.phone}}</td>
            </tr>
        </table>
    </div>
</div>

And here's the corresponding JavaScript code:

function Ctrl($scope) {
$scope.searchText = "";
$scope.friends = [{
    name: 'John',
    phone: '555-1276'
}, {
    name: 'Mary',
    phone: '800-BIG-MARY'
}, {
    name: 'Mike',
    phone: '555-4321'
}, {
    name: 'Adam',
    phone: '555-5678'
}, {
    name: 'Julie',
    phone: '555-8765'
}];
}

Alternatively, you can also apply the $filter("filter") function directly on the friends array in the controller to simplify the HTML markup.

Answer 2

To dynamically display different HTML based on the length of a filtered array, you can utilize the ngSwitch directive in AngularJS.

For a live example, check out this jsFiddle.

Here's the HTML code:

<div ng-app ng-controller="Ctrl">
Search: <input ng-model="searchText">
<div ng-init="filtered = (friends | filter:searchText)">
    <div>{{(friends | filter:searchText).length}}</div>
    <div ng-switch="(friends | filter:searchText).length">
        <span ng-switch-when="0">Nothing was found</span>
        <table id="searchTextResults" ng-switch-default>
            <tr>
                <th>Name</th>
                <th>Phone</th>
            </tr>
            <tr ng-repeat="friend in filtered | filter:searchText">
                <td>{{friend.name}}</td>
                <td>{{friend.phone}}</td>
            </tr>
        </table>
    </div>
</div>

And here's the corresponding JavaScript code:

function Ctrl($scope) {
$scope.searchText = "";
$scope.friends = [{
    name: 'John',
    phone: '555-1276'
}, {
    name: 'Mary',
    phone: '800-BIG-MARY'
}, {
    name: 'Mike',
    phone: '555-4321'
}, {
    name: 'Adam',
    phone: '555-5678'
}, {
    name: 'Julie',
    phone: '555-8765'
}];
}

Alternatively, you can also apply the $filter("filter") function directly on the friends array in the controller to simplify the HTML markup.

Answer 3

Answer №2

Here is a convenient syntax to display a message when no data is found:

<p ng-show="(friends | filter:searchText).length==0">Oops! No results found</p>`

Make sure to replace 'friends' with the appropriate JSON object.

Answer 4

Here is a convenient syntax to display a message when no data is found:

<p ng-show="(friends | filter:searchText).length==0">Oops! No results found</p>`

Make sure to replace 'friends' with the appropriate JSON object.

Answer 5

Answer №3

Using ngRepeat provides the ability to assign a name to the items that remain after applying all the filters. This assigned name can then be used to display the desired content.

<p ng-repeat="friend in friends | filter:searchText as displayedFriends">
    {{friend.name}}
</p>
<p ng-if="!displayedFriends.length">
    No results found
</p>

Answer 6

Using ngRepeat provides the ability to assign a name to the items that remain after applying all the filters. This assigned name can then be used to display the desired content.

<p ng-repeat="friend in friends | filter:searchText as displayedFriends">
    {{friend.name}}
</p>
<p ng-if="!displayedFriends.length">
    No results found
</p>

Showing a notification message in AngularJS when an object is empty within a repeating element

Answer №1

Answer №2

Answer №3

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