Event example from Polymer 3 devguide “Listener on outside elements” throws an exception
1
I've created example for the snippets from the Polymer 3 dev guide. This example doesn't compile as _myLocationListener is not defined and it is used in the constructor. The listener is also not defined inside the dev guide snippet.
How this._myLocationListener property should be initialized.
import {html, PolymerElement} from '@polymer/polymer/polymer-element.js';
/**
* @customElement
* @polymer
*/
class XcustomElementEventHandlingApp extends PolymerElement {
static get template() {
return html`
<style>
:host {
display: block;
border: dotted;
background: aliceblue;
}
</style>
<h2>Hello [[prop1]]!</h2>
<button on-click="handleClick">Kick Me</button>
<div id="child-el-01">Please, check the logs in Console (dev tools).</div>
`;
}
static get properties() {
return {
prop1: {
type: String,
value: 'xcustom-element-event-handling-app'
}
};
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
ready() {
super.ready();
this.addEventListener('click', this._onClick);
const childElement = this.shadowRoot.getElementById('child-el-01');
childElement.addEventListener('click', this._onClick.bind(this));
childElement.addEventListener('mouseover', event => this._onHover(event));
console.log('(this, the) custom element added to DOM.');
}
handleClick() {
console.log('Ow!');
}
_onClick(event) {
this._makeCoffee();
}
_makeCoffee() {
console.log('in _makeCoffee()')
}
_onHover(event) {
console.log('_onHover(ev) called');
console.log(JSON.stringify(event));
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('hashchange', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('hashchange', this._boundListener);
}
}
window.customElements.define('xcustom-element-event-handling-app', XcustomElementEventHandlingApp);
package.json:
{
"name": "xcustom-element-event-handling",
"description": "event handling demo. From dev guide.",
"dependencies": {
"@polymer/polymer": "^3.0.0"
},
"devDependencies": {
"@webcomponents/webcomponentsjs": "^2.0.0",
"wct-browser-legacy": "^1.0.0"
}
}
Following exception is thrown:
Uncaught TypeError: this._myLocationListener.bind is not a function
at new XcustomElementEventHandlingApp (xcustom-element-event-handling-app.js:36)
javascript web-component polymer-3.x
asked Nov 16 '18 at 8:47
TihomirTihomir
748
add a comment |
1
I've created example for the snippets from the Polymer 3 dev guide. This example doesn't compile as _myLocationListener is not defined and it is used in the constructor. The listener is also not defined inside the dev guide snippet.
How this._myLocationListener property should be initialized.
import {html, PolymerElement} from '@polymer/polymer/polymer-element.js';
/**
* @customElement
* @polymer
*/
class XcustomElementEventHandlingApp extends PolymerElement {
static get template() {
return html`
<style>
:host {
display: block;
border: dotted;
background: aliceblue;
}
</style>
<h2>Hello [[prop1]]!</h2>
<button on-click="handleClick">Kick Me</button>
<div id="child-el-01">Please, check the logs in Console (dev tools).</div>
`;
}
static get properties() {
return {
prop1: {
type: String,
value: 'xcustom-element-event-handling-app'
}
};
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
ready() {
super.ready();
this.addEventListener('click', this._onClick);
const childElement = this.shadowRoot.getElementById('child-el-01');
childElement.addEventListener('click', this._onClick.bind(this));
childElement.addEventListener('mouseover', event => this._onHover(event));
console.log('(this, the) custom element added to DOM.');
}
handleClick() {
console.log('Ow!');
}
_onClick(event) {
this._makeCoffee();
}
_makeCoffee() {
console.log('in _makeCoffee()')
}
_onHover(event) {
console.log('_onHover(ev) called');
console.log(JSON.stringify(event));
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('hashchange', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('hashchange', this._boundListener);
}
}
window.customElements.define('xcustom-element-event-handling-app', XcustomElementEventHandlingApp);
package.json:
{
"name": "xcustom-element-event-handling",
"description": "event handling demo. From dev guide.",
"dependencies": {
"@polymer/polymer": "^3.0.0"
},
"devDependencies": {
"@webcomponents/webcomponentsjs": "^2.0.0",
"wct-browser-legacy": "^1.0.0"
}
}
Following exception is thrown:
Uncaught TypeError: this._myLocationListener.bind is not a function
at new XcustomElementEventHandlingApp (xcustom-element-event-handling-app.js:36)
javascript web-component polymer-3.x
asked Nov 16 '18 at 8:47
TihomirTihomir
748
stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34
add a comment |
1
1
1
I've created example for the snippets from the Polymer 3 dev guide. This example doesn't compile as _myLocationListener is not defined and it is used in the constructor. The listener is also not defined inside the dev guide snippet.
How this._myLocationListener property should be initialized.
import {html, PolymerElement} from '@polymer/polymer/polymer-element.js';
/**
* @customElement
* @polymer
*/
class XcustomElementEventHandlingApp extends PolymerElement {
static get template() {
return html`
<style>
:host {
display: block;
border: dotted;
background: aliceblue;
}
</style>
<h2>Hello [[prop1]]!</h2>
<button on-click="handleClick">Kick Me</button>
<div id="child-el-01">Please, check the logs in Console (dev tools).</div>
`;
}
static get properties() {
return {
prop1: {
type: String,
value: 'xcustom-element-event-handling-app'
}
};
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
ready() {
super.ready();
this.addEventListener('click', this._onClick);
const childElement = this.shadowRoot.getElementById('child-el-01');
childElement.addEventListener('click', this._onClick.bind(this));
childElement.addEventListener('mouseover', event => this._onHover(event));
console.log('(this, the) custom element added to DOM.');
}
handleClick() {
console.log('Ow!');
}
_onClick(event) {
this._makeCoffee();
}
_makeCoffee() {
console.log('in _makeCoffee()')
}
_onHover(event) {
console.log('_onHover(ev) called');
console.log(JSON.stringify(event));
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('hashchange', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('hashchange', this._boundListener);
}
}
window.customElements.define('xcustom-element-event-handling-app', XcustomElementEventHandlingApp);
package.json:
{
"name": "xcustom-element-event-handling",
"description": "event handling demo. From dev guide.",
"dependencies": {
"@polymer/polymer": "^3.0.0"
},
"devDependencies": {
"@webcomponents/webcomponentsjs": "^2.0.0",
"wct-browser-legacy": "^1.0.0"
}
}
Following exception is thrown:
Uncaught TypeError: this._myLocationListener.bind is not a function
at new XcustomElementEventHandlingApp (xcustom-element-event-handling-app.js:36)
javascript web-component polymer-3.x
asked Nov 16 '18 at 8:47
TihomirTihomir
748
I've created example for the snippets from the Polymer 3 dev guide. This example doesn't compile as _myLocationListener is not defined and it is used in the constructor. The listener is also not defined inside the dev guide snippet.
How this._myLocationListener property should be initialized.
import {html, PolymerElement} from '@polymer/polymer/polymer-element.js';
/**
* @customElement
* @polymer
*/
class XcustomElementEventHandlingApp extends PolymerElement {
static get template() {
return html`
<style>
:host {
display: block;
border: dotted;
background: aliceblue;
}
</style>
<h2>Hello [[prop1]]!</h2>
<button on-click="handleClick">Kick Me</button>
<div id="child-el-01">Please, check the logs in Console (dev tools).</div>
`;
}
static get properties() {
return {
prop1: {
type: String,
value: 'xcustom-element-event-handling-app'
}
};
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
ready() {
super.ready();
this.addEventListener('click', this._onClick);
const childElement = this.shadowRoot.getElementById('child-el-01');
childElement.addEventListener('click', this._onClick.bind(this));
childElement.addEventListener('mouseover', event => this._onHover(event));
console.log('(this, the) custom element added to DOM.');
}
handleClick() {
console.log('Ow!');
}
_onClick(event) {
this._makeCoffee();
}
_makeCoffee() {
console.log('in _makeCoffee()')
}
_onHover(event) {
console.log('_onHover(ev) called');
console.log(JSON.stringify(event));
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('hashchange', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('hashchange', this._boundListener);
}
}
window.customElements.define('xcustom-element-event-handling-app', XcustomElementEventHandlingApp);
package.json:
{
"name": "xcustom-element-event-handling",
"description": "event handling demo. From dev guide.",
"dependencies": {
"@polymer/polymer": "^3.0.0"
},
"devDependencies": {
"@webcomponents/webcomponentsjs": "^2.0.0",
"wct-browser-legacy": "^1.0.0"
}
}
Following exception is thrown:
Uncaught TypeError: this._myLocationListener.bind is not a function
at new XcustomElementEventHandlingApp (xcustom-element-event-handling-app.js:36)
javascript web-component polymer-3.x
javascript web-component polymer-3.x
asked Nov 16 '18 at 8:47
TihomirTihomir
748
asked Nov 16 '18 at 8:47
TihomirTihomir
748
edited Nov 16 '18 at 13:33
Tihomir
asked Nov 16 '18 at 8:47
TihomirTihomir
748
asked Nov 16 '18 at 8:47
TihomirTihomir
748
asked Nov 16 '18 at 8:47
TihomirTihomir
748
748
stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34
add a comment |
stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34
stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34
add a comment |
1 Answer
1
active
oldest
votes
1
At the above example, the main idea is if you like to listen an event from outside of this custom element. You may set up a listener inside connectedCallback and remove it with disconnectedCallback, then assign a function in the element after event occure.
Something like
index.html :
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script type="module" src="x-custom.js"></script>
</head>
<body>
<button>This button not in the element</button>
<x-custom></x-custom>
</body>
</html>
x-custom.js:
import { PolymerElement, html } from 'https://unpkg.com/@polymer/polymer@3.0.0-pre.12/polymer-element.js';
class XCustom extends PolymerElement {
static get template() {
return html`<h2>Hello </h2> `;
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('click', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('click', this._boundListener);
}
_myLocationListener(){
alert('This click comes from index.html - out of this element')
}
}
window.customElements.define('x-custom', XCustom);
DEMO
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
At the above example, the main idea is if you like to listen an event from outside of this custom element. You may set up a listener inside connectedCallback and remove it with disconnectedCallback, then assign a function in the element after event occure.
Something like
index.html :
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script type="module" src="x-custom.js"></script>
</head>
<body>
<button>This button not in the element</button>
<x-custom></x-custom>
</body>
</html>
x-custom.js:
import { PolymerElement, html } from 'https://unpkg.com/@polymer/polymer@3.0.0-pre.12/polymer-element.js';
class XCustom extends PolymerElement {
static get template() {
return html`<h2>Hello </h2> `;
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('click', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('click', this._boundListener);
}
_myLocationListener(){
alert('This click comes from index.html - out of this element')
}
}
window.customElements.define('x-custom', XCustom);
DEMO
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
add a comment |
1
At the above example, the main idea is if you like to listen an event from outside of this custom element. You may set up a listener inside connectedCallback and remove it with disconnectedCallback, then assign a function in the element after event occure.
Something like
index.html :
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script type="module" src="x-custom.js"></script>
</head>
<body>
<button>This button not in the element</button>
<x-custom></x-custom>
</body>
</html>
x-custom.js:
import { PolymerElement, html } from 'https://unpkg.com/@polymer/polymer@3.0.0-pre.12/polymer-element.js';
class XCustom extends PolymerElement {
static get template() {
return html`<h2>Hello </h2> `;
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('click', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('click', this._boundListener);
}
_myLocationListener(){
alert('This click comes from index.html - out of this element')
}
}
window.customElements.define('x-custom', XCustom);
DEMO
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
add a comment |
1
1
1
At the above example, the main idea is if you like to listen an event from outside of this custom element. You may set up a listener inside connectedCallback and remove it with disconnectedCallback, then assign a function in the element after event occure.
Something like
index.html :
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script type="module" src="x-custom.js"></script>
</head>
<body>
<button>This button not in the element</button>
<x-custom></x-custom>
</body>
</html>
x-custom.js:
import { PolymerElement, html } from 'https://unpkg.com/@polymer/polymer@3.0.0-pre.12/polymer-element.js';
class XCustom extends PolymerElement {
static get template() {
return html`<h2>Hello </h2> `;
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('click', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('click', this._boundListener);
}
_myLocationListener(){
alert('This click comes from index.html - out of this element')
}
}
window.customElements.define('x-custom', XCustom);
DEMO
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
At the above example, the main idea is if you like to listen an event from outside of this custom element. You may set up a listener inside connectedCallback and remove it with disconnectedCallback, then assign a function in the element after event occure.
Something like
index.html :
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script type="module" src="x-custom.js"></script>
</head>
<body>
<button>This button not in the element</button>
<x-custom></x-custom>
</body>
</html>
x-custom.js:
import { PolymerElement, html } from 'https://unpkg.com/@polymer/polymer@3.0.0-pre.12/polymer-element.js';
class XCustom extends PolymerElement {
static get template() {
return html`<h2>Hello </h2> `;
}
constructor() {
super();
this._boundListener = this._myLocationListener.bind(this);
}
connectedCallback() {
super.connectedCallback();
window.addEventListener('click', this._boundListener);
}
disconnectedCallback() {
super.disconnectedCallback();
window.removeEventListener('click', this._boundListener);
}
_myLocationListener(){
alert('This click comes from index.html - out of this element')
}
}
window.customElements.define('x-custom', XCustom);
DEMO
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
answered Nov 16 '18 at 18:20
HakanCHakanC
2,2693814
2,2693814
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
add a comment |
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
Thank you very much! Additionally we can add an id to button to listen only button clicks: window.document.getElementById('xyz1').addEventListener('click', this._boundListener);
– Tihomir
Nov 17 '18 at 6:34
add a comment |
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stackoverflow.com/help/how-to-ask
– Eugene Mihaylin
Nov 16 '18 at 9:01
Hope that latest edit did improve the question. I'm just started with Polymer 3 and am trying to run the dev. guide examples.
– Tihomir
Nov 16 '18 at 9:26
please add concrete code sample and error to the question body
– Eugene Mihaylin
Nov 16 '18 at 9:27
Thanks! Example code and link to snippet are added to question body.
– Tihomir
Nov 16 '18 at 14:34