Adding Web Component for Ionic Modals
Tags: podcast, webdev, javascript, beginners
Published: 2022-08-30 18:28:03


So for this Web Component we are going to code a [Custom Element](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements) from scratch, not using Stencil, Polymer, or Angular.This just builds a simple search modal that allows for Algolia search searchResults:

![](https://media.codingcat.dev/image/upload/v1657636768/main-codingcatdev-photo/a703bdcc-84a1-4e33-a4b0-31865abe91c6.png)

### Modal Code

I don't know if I can add much more than what Eric Bidelman wrote for [Custom Elements](https://developers.google.com/web/fundamentals/web-components/customelements). I would just say you can basically put anything in them, just make sure you have the `connectedCallback()` in place if you need to run code each iteration.

> 

	connectedCallback: Called every time the element is inserted into the DOM. Useful for running setup code, such as fetching resources or rendering. Generally, you should try to delay work until this time.

```javascript
customElements.define('modal-search', class extends HTMLElement {
    constructor() {
        super(); this.attachShadow({ mode: 'open' });
    }
    connectedCallback() {
        const ionHeader = document.createElement('ion-header');
        const ionToolbar = document.createElement('ion-toolbar');
        const ionTitle = document.createElement('ion-title');
        ionTitle.innerHTML = <ion-label color='primary'>Search Purr-fectly</ion-label>
        const ionButtons = document.createElement('ion-buttons');
        ionButtons.setAttribute('slot', 'primary');
        const ionButton = document.createElement('ion-button');
        ionButton.addEventListener('click', async () => {
            const modalController = document.querySelector('ion-modal-controller'); await modalController.dismiss({ 'dismissed': true });
        })
        const ionIconClose = document.createElement('ion-icon'); ionIconClose.setAttribute('slot', 'icon-only');
        ionIconClose.setAttribute('name', 'close'); ionButton.appendChild(ionIconClose);
        ionButtons.appendChild(ionButton); ionToolbar.appendChild(ionButtons);
        ionToolbar.appendChild(ionTitle); ionHeader.appendChild(ionToolbar);
        const ionSearchbar = document.createElement('ion-searchbar');
        const searchContent = document.createElement('ion-content');
        ionSearchbar.addEventListener('ionChange', async ev => {
            try { const searchResults = await index.search({ query: ev.detail.value });
                const ionList = document.createElement('ion-list'); searchResults.hits.forEach(hit => {
                const ionItem = document.createElement('ion-item'); ionItem.setAttribute('href', hit.url);
                const ionLabel = document.createElement('ion-label');
                const title = document.createElement('h2'); title.innerHTML = hit._highlightResult.title.value; ionLabel.appendChild(title);
                const summary = document.createElement('p'); summary.innerHTML = hit._highlightResult.summary.value; ionLabel.appendChild(summary);
                ionItem.appendChild(ionLabel); ionList.appendChild(ionItem); }); searchContent.innerHTML = ionList.innerHTML
            }
            catch (err) {
                console.log(err); console.log(err.debugData);
            }
        });
        this.shadowRoot.appendChild(ionHeader);
        this.shadowRoot.appendChild(ionSearchbar);
        this.shadowRoot.appendChild(searchContent);
    }
});

```

### Event Listener for click

This is utilizing [Ionic's Modal](https://ionicframework.com/docs/api/modal). Please also not you _MUST_ include the `<ion-modal-controller>` in your site or this will not work (trust me lost hours of my life on that one)! Notice in `modalController.create` we are passing a `component: 'modal-search'` property. This is the name of custom element that we created above.

```javascript
mainSearch.forEach(b => {
    b.addEventListener('click', async (event) => {
        // initialize controller
        const modalController = document.querySelector('ion-modal-controller');
        await modalController.componentOnReady();
        // present the modal const modalElement =
        await modalController.create({
            animated: true,
            component: 'modal-search',
            componentProps: {
                search: event.currentTarget.getAttribute('search')
            } });
        await modalElement.present();
    });
});

```

## The BEST Part

Now I could package this up and add it to NPM as a nice package. Better yet we could create it from a Stencil component next.Let me know what you think!