Button

A Button component provides an easy-to-use way for interacting through the application and invoking custom logic in response to that. Once the user taps it, the button performs any actions attached to it.

Usage

A Button component can execute custom logic via its tap event. Handling the event is as easy as using (tap) in HTML, and implementing a tap handler in your component.

<Button text="Tap me!" tap="onTap"></Button>

function onTap(args) {
    const button = args.object;
    alert(`Tapped ${count} times!`);
}
exports.onTap = onTap;

export function onTap(args: EventData) {
    const button = <Button>args.object;
    alert("Tapped " + count + " times!");
}

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Demo Source

Styling

The Button component can be styled using CSS or corresponding properties.

<StackLayout>
    <!-- No styles applied -->
    <Button text="Button"></Button>
    <!-- Using local CSS class -->
    <Button text=".my-button" class="my-button"></Button>
    <!-- Using nativescript-theme-core CSS classes -->
    <Button text="Button.-primary" class="-primary"></Button>
    <Button class="-primary">
        <FormattedString>
            <Span text="&#xf099;" class="fab"></Span>
            <Span text=" Button.-primary with icon"></Span>
        </FormattedString>
    </Button>
    <Button text="Button.-outline" class="-outline"></Button>
    <Button text="Button.-primary.-rounded-sm" class="-primary -rounded-sm"></Button>
    <Button text="Button.-primary.-rounded-lg" class="-primary -rounded-lg"></Button>
    <Button text="Button.-outline.-rounded-sm" class="-outline -rounded-sm"></Button>
    <Button text="Button.-outline.-rounded-lg" class="-outline -rounded-lg"></Button>
    <Button text="Button.-outline[isEnabled=false]" isEnabled="false" class="-outline"></Button>
    <Button text="Button.-primary[isEnabled=false]" isEnabled="false" class="-primary"></Button>
</StackLayout>

.my-button {
    android-elevation: 4;
    background-color: lightseagreen;
    border-color: darkolivegreen;
    border-radius: 20;
    border-width: 1;
    color: whitesmoke;
    font-size: 18;
    font-weight: bold;
}

.my-button:active {
    android-elevation: 8;
    background-color: whitesmoke;
    border-color: darkolivegreen;
    border-radius: 20;
    border-width: 1;
    color: lightseagreen;
    font-size: 18;
    font-weight: bold;
}

Specific Styling Properties

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Demo Source

Tips And Tricks

Creating Button via Code-Behind

Creating a Button programmatically with text value and a tap callback.

<StackLayout id="container" verticalAlignment="middle"/>

const myButton = new Button();
myButton.text = "Tap me!";
myButton.className = "btn btn-primary btn-active";
myButton.on("tap", (data) => {
    // args is of type EventData
    alert("Button Tapped!");
});

const myButton = new Button();
myButton.text = "Tap me!";
myButton.className = "btn btn-primary btn-active";
myButton.on(Button.tapEvent, (data: GestureEventData) => {
    // data is of type GestureEventData
    alert("Button Tapped!");
});

Properties

Events

API References

Native Component