Question

选中或取消选中我的切换后，我会有一个复选框，该元素将被添加到textarea。

所以如果不加以检查，我希望将其删除，有没有办法做到这一点？

exemple.html

<ion-toggle class="toggle-small" toggle-class="toggle-calm" 
            (ionChange)="addElement()" >  Airplane Mode
</ion-toggle>

exemple.ts

 addElement() {
const messageTextarea = (<HTMLInputElement>document.getElementById('msg'));
const selecStart = messageTextarea.selectionStart;
const selectEnd = messageTextarea.selectionEnd;
let newMessage = '' + this.msg;
newMessage = newMessage.substring(selecStart, 0) + 
             newMessage.substring(selectEnd, newMessage.length)+this.element;}

Answer 1

注意我声明了一个模板变量ioToggle并使用了checked属性

String query = "{find_by_id (id: 1){eventName}}";
ExecutionResult result = graphQL.execute(query);

你需要像这样更新addElemnt函数

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    try {
        boolean success = mMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(getContext(), R.raw.style_json));
        if (!success) {
            Log.e("MapsActivityRaw", "Style parsing failed.");
        }

    } catch (Resources.NotFoundException e) {
        Log.e("MapsActivityRaw", "Can't find style.", e);
    }

    final LatLng myLatlng = new LatLng(-33.999564, 18.516763);
    mMap.moveCamera(CameraUpdateFactory.newLatLng(myLatlng));
    mMap.animateCamera( CameraUpdateFactory.zoomTo( 11.0f ) );

    mMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
        public void onMapLoaded() {

            bar.setVisibility(View.GONE);
            drawCircle(myLatlng);

        }
    });

}

private void drawCircle(LatLng point){
    CircleOptions circleOptions = new CircleOptions();
    circleOptions.center(point);
    circleOptions.radius(500);
    circleOptions.strokeColor(Color.BLACK);
    circleOptions.fillColor(0x30ff0000);
    circleOptions.strokeWidth(2);
    mMap.addCircle(circleOptions);

}

如果选中复选框，如何添加元素，如果未选中则删除它？

1 个答案: