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Custom Input using Decorator Pattern.
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| import { LitElement, html } from '../../node_modules/@polymer/lit-element/lit-element.js'; | |
| import {ifDefined} from '../../node_modules/lit-html/directives/if-defined.js'; | |
| import {classMap} from '../../node_modules/lit-html/directives/class-map.js'; | |
| import {render} from '../../node_modules/lit-html/lib/shady-render.js'; | |
| let inputCounter = 0; | |
| class CustomInput extends LitElement { | |
| static get properties() { | |
| return { | |
| label: {type: String}, | |
| disabled: {type: Boolean}, | |
| invalid: {type: Boolean, reflect: true}, | |
| title: {type: String}, | |
| type: {type: String}, | |
| pattern: {type: String}, | |
| placeholder: {type: String}, | |
| autocomplete: {type: String}, | |
| autofocus: {type: Boolean}, | |
| form: {type: String}, | |
| list: {type: String}, | |
| name: {type: String}, | |
| readonly: {type: Boolean}, | |
| required: {type: Boolean}, | |
| value: {type: String}, | |
| max: {type: Number}, | |
| min: {type: Number}, | |
| step: {type: Number}, | |
| message:{type: String}, | |
| _placeholder: {type: String}, | |
| validator: {type: Function} | |
| }; | |
| } | |
| constructor() { | |
| super(); | |
| this.label = ''; | |
| this.name = ''; | |
| this.type='text'; | |
| this.disabled = false; | |
| this.autofocus = false; | |
| this.readonly = false; | |
| this.required = false; | |
| this.value = ''; | |
| this.invalid = false; | |
| this.message = ''; | |
| this._placeholder = this.label; //only for now | |
| this.inputid = 'custom-input-id-' + inputCounter++; | |
| this._inputChanged = this._inputChanged.bind(this); | |
| } | |
| connectedCallback() { | |
| super.connectedCallback(); | |
| if (this.input === undefined) { | |
| this.renderInput(); | |
| this.input = this.querySelector('#' + this.id); | |
| } | |
| } | |
| update(changed) { | |
| if (changed.has('placeholder') || changed.has('label')) { | |
| this._placeholder = this.placeholder || this.label; | |
| } | |
| if (changed.has('value') && changed.get('value') !== undefined) { | |
| this.dispatchEvent(new CustomEvent('value-changed')); | |
| } | |
| super.update(); | |
| } | |
| render() { | |
| this.renderInput(); | |
| return html` | |
| <style> | |
| :host { | |
| display: block; | |
| } | |
| ::slotted(input) { | |
| border-left: none; | |
| border-right: none; | |
| border-top: none; | |
| border-bottom: 1px solid grey; | |
| position: relative; | |
| font-family: Roboto, sans-serif; | |
| padding: 2px 0; | |
| margin-bottom: 10px; | |
| } | |
| ::slotted(input:focus) { | |
| border-bottom-color: var(--pas-input-focus-colour, blue); | |
| outline: none; | |
| } | |
| ::slotted(input.error), ::slotted(input:focus.error) { | |
| border-bottom-color: red; | |
| } | |
| .error { | |
| color: red; | |
| } | |
| div.errorcontainer { | |
| position: relative | |
| } | |
| div.error { | |
| position: absolute; | |
| left: 2px; | |
| top: -10px; | |
| font-size: 8pt; | |
| } | |
| label { | |
| display:block; | |
| transform: translate(5px, 20px); | |
| transition: 0.5s ease-in-out; | |
| font-size: 8pt; | |
| } | |
| label.inplace { | |
| transform: translate(0,0); | |
| font-size: 10pt; | |
| } | |
| </style> | |
| <label id="label" for=${this.inputid} class=${classMap({ | |
| inplace: this.placeholder !== undefined || this.value.length > 0, | |
| error: this.invalid | |
| })}>${this.label}</label> | |
| <slot name=${this.inputid}></slot> | |
| <div class="errorcontainer"> | |
| ${this.invalid ? html`<div class="error">${this.message}</div>` : ''} | |
| </div> | |
| `; | |
| } | |
| renderInput() { | |
| render(this.inputTemplate(), this, this.localName); | |
| } | |
| inputTemplate() { | |
| return html` | |
| <input | |
| id="${this.inputid}" | |
| slot=${this.inputid} | |
| class="${classMap({error: this.invalid})}" | |
| type=${this.type} | |
| aria-labelledby="label" | |
| ?disabled=${this.disabled} | |
| title=${ifDefined(this.title)} | |
| pattern=${ifDefined(this.pattern)} | |
| placeholder=${this._placeholder} | |
| autocomplete=${ifDefined(this.autocomplete)} | |
| ?autofocus=${this.autofocus} | |
| form=${ifDefined(this.form)} | |
| list=${ifDefined(this.list)} | |
| name=${this.name} | |
| ?readonly=${this.readonly} | |
| ?required=${this.required} | |
| value=${this.value} | |
| max=${ifDefined(this.max)} | |
| min=${ifDefined(this.min)} | |
| step=${ifDefined(this.step)} | |
| @input=${this._inputChanged} | |
| /> | |
| `; | |
| } | |
| validate() { | |
| if (typeof this.validator === 'function' ) { | |
| return this.validator(this.value); | |
| } | |
| return !this.invalid; | |
| } | |
| _inputChanged(e) { | |
| e.stopPropagation(); | |
| if (this.value !== e.target.value) { | |
| this.invalid = false; | |
| this.value = e.target.value; | |
| } | |
| } | |
| } | |
| customElements.define('custom-input', CustomInput); |
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