Adding Web Component for Ionic Modals

Adding Web Component for Ionic Modals

Posted: 9/11/2019

So for this Web Component we are going to code a Custom Element from scratch, not using Stencil, Polymer, or Angular.This just builds a simple search modal that allows for Algolia search searchResults:

I don’t know if I can add much more than what Eric Bidelman wrote for Custom Elements. 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.

	class extends HTMLElement {
		constructor() {
			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');
			const ionSearchbar = document.createElement('ion-searchbar');
			const searchContent = document.createElement('ion-content');
			ionSearchbar.addEventListener('ionChange', async (ev) => {
				try {
					const searchResults = await{ 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;
						const summary = document.createElement('p');
						summary.innerHTML = hit._highlightResult.summary.value;
					searchContent.innerHTML = ionList.innerHTML;
				} catch (err) {

Event Listener for click

This is utilizing Ionic’s 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.

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!