DevExtreme Angular - Show and Hide Using the API

NOTE
In this article, the Button widget is used to demonstrate how to show and hide the LoadIndicator. This choice is made for purely demonstrational purposes, and you can do the same operations using another widget following the same guidelines.

To specify whether the LoadIndicator is shown, change the visible option.

jQuery
HTML
JavaScript
<div id="loadIndicatorContainer"></div>
<div id="buttonContainer"></div>
$(function() {
    var loadIndicator =  $("#loadIndicatorContainer").dxLoadIndicator({
        visible: false      
    }).dxLoadIndicator("instance");

    $("#buttonContainer").dxButton({
        text: "Toggle the LoadIndicator", 
        onClick: function () {
            var isLoadIndicatorVisible = loadIndicator.option("visible");
            loadIndicator.option("visible", !isLoadIndicatorVisible);
        } 
    });
});
ASP.NET MVC Controls
Razor C#
Razor VB
@(Html.DevExtreme().LoadIndicator()
    .ID("loadIndicator")
    .Visible(false)
)

@(Html.DevExtreme().Button()
    .ID("button")
    .Text("Toggle the LoadIndicator")
    .OnClick(@<text>
        function () {
            var loadIndicator = $("#loadIndicator").dxLoadIndicator("instance");
            var isLoadIndicatorVisible = loadIndicator.option("visible");
            loadIndicator.option("visible", !isLoadIndicatorVisible);
        } 
    </text>)
)
@(Html.DevExtreme().LoadIndicator() _
    .ID("loadIndicator") _
    .Visible(False)
)

@(Html.DevExtreme().Button() _
    .ID("button") _
    .Text("Toggle the LoadIndicator") _
    .OnClick("button_click")
)

<script>
    function button_click() {
        var loadIndicator = $("#loadIndicator").dxLoadIndicator("instance");
        var isLoadIndicatorVisible = loadIndicator.option("visible");
        loadIndicator.option("visible", !isLoadIndicatorVisible);
    }
</script>

With Angular, AngularJS, or Knockout, bind the visible property of the LoadIndicator widget to a component property (in Angular), a scope property (in AngularJS), or an observable variable (in Knockout). After that, change this property/variable, and the LoadIndicator will appear or disappear.

Angular
HTML
TypeScript
<dx-load-indicator
    [(visible)]="isLoadIndicatorVisible">
</dx-load-indicator>
<dx-button
    text="Toggle the LoadIndicator"
    (onClick)="isLoadIndicatorVisible = !isLoadIndicatorVisible">
</dx-button>
import { DxLoadIndicatorModule, DxButtonModule } from "devextreme-angular";
// ...
export class AppComponent {
    isLoadIndicatorVisible: boolean = true;
}
@NgModule({
    imports: [
        // ...
        DxLoadIndicatorModule,
        DxButtonModule
    ],
    // ...
})
AngularJS
HTML
JavaScript
<div ng-controller="DemoController">
    <div dx-load-indicator="{
        bindingOptions: {
            visible: 'isLoadIndicatorVisible'
        }
    }"></div>
    <div dx-button="{
        text: 'Toggle the LoadIndicator',
        onClick: toggleLoadIndicator
    }"></div>
</div>
angular.module('DemoApp', ['dx'])
    .controller('DemoController', function DemoController($scope) {
        $scope.isLoadIndicatorVisible = false;
        $scope.toggleLoadIndicator = function () {
            var currentValue = $scope.isLoadIndicatorVisible;
            $scope.isLoadIndicatorVisible = !currentValue;
        }
    });
Knockout
HTML
JavaScript
<div data-bind="dxLoadIndicator: {
    visible: isLoadIndicatorVisible
}"></div>
<div data-bind="dxButton: {
    text: 'Toggle the LoadIndicator',
    onClick: function (e) {
        var currentValue = e.model.isLoadIndicatorVisible();
        e.model.isLoadIndicatorVisible(!currentValue);
    }
}"></div>
var viewModel = {
    isLoadIndicatorVisible: ko.observable(false)
};

ko.applyBindings(viewModel);
See Also