Access the NativeScript DropDown widget by triggering it with another user interface element

As someone who is just starting out with Nativescript, I have a question that may seem basic to some. I wanted my dropdown to have a more web browser-like feel, so I decided to use the NativeScript DropDown widget by PeterStaev. I customized it with a GridLayout and styled it to fit my needs.

Here is an image of the setup:

https://i.sstatic.net/REXqw.png

This is the XML code for the dropdown menu:

<GridLayout columns="*,auto" class="drop-down-menu" tap="{{ openDropDown }}">
   <dd:DropDown items="{{ items }}" selectedIndex="{{ selectedIndex }}" col="0" class="drop-down" />
   <Label text="&#xf078;" textWrap="false" col="1" class="font-awesome" />
</GridLayout>

Currently, my view-model file looks like this:

...
import { DropDown } from 'nativescript-drop-down';

export class RegisterViewModel extends Observable {
    ...
    public openDropDown() {
        console.log('I was tapped’); //this works
    }
}

And here is my code-behind TypeScript file (.ts):

...
import { RegisterViewModel } from '../../viewmodels/register/register-view-model';

export function pageLoaded(args: EventData) {
    let page = <Page>args.object;
    page.bindingContext = new RegisterViewModel;
}

I am looking for guidance on how to make the openDropDown function in the GridLayout trigger the dropdown widget. Essentially, I want the entire area of the GridLayout, including the font icon, to be able to open the dropdown menu. Any help or suggestions for a more elegant solution would be greatly appreciated.

Answer №1

Included in the nativescript-drop-down plugin is a convenient method for activating the drop-down feature. You can find detailed instructions on how to use this method in the README at: https://github.com/PeterStaev/NativeScript-Drop-Down#methods

To utilize this feature, you first need to obtain a reference to the dropdown within your designated method called openDropDown. By assigning an ID to the drop-down UI component and retrieving it using the method, you can then call upon .open() to trigger the opening of the drop-down interface.

For the code snippet below to function properly, it assumes that you have already instantiated the Page and stored it as a variable named page. While there are alternative approaches to accessing the component, this method has been proven effective.


public openDropDown(args: EventData) {
    console.log('The tap event occurred.'); //this demonstrates functionality
    let page = <Page>args.object;
    let dropdown = <DropDown>page.getViewById('yourDropDid');
    dropdown.open();
}

Answer №2

After some trial and error, I managed to make it work by incorporating the following HTML code:

<GridLayout class="dropdown_container" columns="auto, *" (tap)="openDropdown($event)">
   <DropDown id="ddoptions"
              [class]="cssClassOption"
              [items]="ddoptions"
              [(ngModel)]="selectedOptionIndex"
              [hint]="hintoption"
              (selectedIndexChanged)="onSelectionChange($event)"
              (opened)="onDropdownOpen()"
              (closed)="onDropdownClose()"
              row="0"
              col="0">
    </DropDown>
</GridLayout>

I made sure to include the id attribute instead of just using #ddoptions.

The openDropdown() function implementation is as follows:

let dropdown = <DropDown>this.page.getViewById('ddoptions');
dropdown.open();

The page value has been initialized within the constructor like this:

private page: Page

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