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Create a custom input element

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11

3

I'm trying to create a custom component that extends the HTMLInputElement component, but nothing renders.

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

What am I missing here?

javascript html custom-element

share|improve this question

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

add a comment | 

11

3

I'm trying to create a custom component that extends the HTMLInputElement component, but nothing renders.

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

What am I missing here?

javascript html custom-element

share|improve this question

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

add a comment | 

I'm trying to create a custom component that extends the HTMLInputElement component, but nothing renders.

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

What am I missing here?

javascript html custom-element

share|improve this question

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

class myInput extends HTMLInputElement ;

customElements.define('my-input', myInput, 
 extends: 'input'
);

<my-input type="text"></my-input>

share|improve this question

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

share|improve this question

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

edited May 7 at 9:05

Kévin Bibollet

2,4561725

edited May 7 at 9:05

Kévin Bibollet

2,4561725

asked May 6 at 8:45

dutzidutzi

1,0921714

asked May 6 at 8:45

dutzidutzi

1,0921714

1 Answer
1

active

oldest

votes

23

What you are expecting is not happening because that's not the correct way to extend an already built-in element.

As MDN documentation states, you need to keep the built-in tag in your DOM and affect it a is attribute.

Look at the snippet below by focusing on the spot input.

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

But I am guessing that you want to be allowed to use a <spot-input> tag. You can do that by attaching a shadow DOM, creating an autonomous element and append it a <input>.

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

Then, if you check the DOM tree, you should have:

<input type="number">

<spot-input type="number">
 #shadow-root (open)
 <input type="number">
</spot-input>

share|improve this answer

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

add a comment | 

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23

What you are expecting is not happening because that's not the correct way to extend an already built-in element.

As MDN documentation states, you need to keep the built-in tag in your DOM and affect it a is attribute.

Look at the snippet below by focusing on the spot input.

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

But I am guessing that you want to be allowed to use a <spot-input> tag. You can do that by attaching a shadow DOM, creating an autonomous element and append it a <input>.

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

Then, if you check the DOM tree, you should have:

<input type="number">

<spot-input type="number">
 #shadow-root (open)
 <input type="number">
</spot-input>

share|improve this answer

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

add a comment | 

23

What you are expecting is not happening because that's not the correct way to extend an already built-in element.

As MDN documentation states, you need to keep the built-in tag in your DOM and affect it a is attribute.

Look at the snippet below by focusing on the spot input.

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

But I am guessing that you want to be allowed to use a <spot-input> tag. You can do that by attaching a shadow DOM, creating an autonomous element and append it a <input>.

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

Then, if you check the DOM tree, you should have:

<input type="number">

<spot-input type="number">
 #shadow-root (open)
 <input type="number">
</spot-input>

share|improve this answer

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

add a comment | 

What you are expecting is not happening because that's not the correct way to extend an already built-in element.

As MDN documentation states, you need to keep the built-in tag in your DOM and affect it a is attribute.

Look at the snippet below by focusing on the spot input.

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

But I am guessing that you want to be allowed to use a <spot-input> tag. You can do that by attaching a shadow DOM, creating an autonomous element and append it a <input>.

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

Then, if you check the DOM tree, you should have:

<input type="number">

<spot-input type="number">
 #shadow-root (open)
 <input type="number">
</spot-input>

share|improve this answer

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

<input type="number">

<spot-input type="number">
 #shadow-root (open)
 <input type="number">
</spot-input>

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

class spotInput extends HTMLInputElement 
 constructor(...args) 
 super(...args);
 
 this.addEventListener('focus', () => 
 console.log('Focus on spotinput');
 );
 
;

customElements.define('spot-input', spotInput, 
 extends: 'input',
);

<input type="text" placeholder="simple input">
<input is="spot-input" type="text" placeholder="spot input">

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

class spotInput extends HTMLElement 
 constructor(...args) 
 super(...args);
 
 // Attaches a shadow root to your custom element.
 const shadowRoot = this.attachShadow(mode: 'open');
 
 // Defines the "real" input element.
 let inputElement = document.createElement('input');
 inputElement.setAttribute('type', this.getAttribute('type'));
 
 inputElement.addEventListener('focus', () => 
 console.log('focus on spot input');
 );
 
 // Appends the input into the shadow root.
 shadowRoot.appendChild(inputElement);
 
;

customElements.define('spot-input', spotInput);

<input type="number">
<spot-input type="number"></spot-input>

share|improve this answer

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

edited May 6 at 21:02

dwirony

4,77231434

edited May 6 at 21:02

dwirony

4,77231434

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725

answered May 6 at 9:17

Kévin BibolletKévin Bibollet

2,4561725