94 lines
3 KiB
TypeScript
94 lines
3 KiB
TypeScript
import {UIElement} from "../UIElement";
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import {InputElement} from "./InputElement";
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import Translations from "../i18n/Translations";
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import {UIEventSource} from "../../Logic/UIEventSource";
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export class DropDown<T> extends InputElement<T> {
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private readonly _label: UIElement;
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private readonly _values: { value: T; shown: UIElement }[];
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private readonly _value: UIEventSource<T>;
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public IsSelected: UIEventSource<boolean> = new UIEventSource<boolean>(false);
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private readonly _label_class: string;
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private readonly _select_class: string;
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constructor(label: string | UIElement,
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values: { value: T, shown: string | UIElement }[],
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value: UIEventSource<T> = undefined,
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label_class: string = "",
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select_class: string = "") {
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super(undefined);
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this._value = value ?? new UIEventSource<T>(undefined);
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this._label = Translations.W(label);
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this._label_class = label_class || '';
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this._select_class = select_class || '';
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this._values = values.map(v => {
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return {
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value: v.value,
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shown: Translations.W(v.shown)
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}
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}
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);
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for (const v of this._values) {
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this.ListenTo(v.shown._source);
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}
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this.ListenTo(this._value);
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this.onClick(() => {}) // by registering a click, the click event is consumed and doesn't bubble furter to other elements, e.g. checkboxes
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}
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GetValue(): UIEventSource<T> {
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return this._value;
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}
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IsValid(t: T): boolean {
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for (const value of this._values) {
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if (value.value === t) {
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return true;
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}
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}
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return false
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}
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InnerRender(): string {
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if(this._values.length <=1){
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return "";
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}
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let options = "";
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for (let i = 0; i < this._values.length; i++) {
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options += "<option value='" + i + "'>" + this._values[i].shown.InnerRender() + "</option>"
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}
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return `<form>` +
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`<label class='${this._label_class}' for='dropdown-${this.id}'>${this._label.Render()}</label>` +
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`<select class='${this._select_class}' name='dropdown-${this.id}' id='dropdown-${this.id}'>` +
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options +
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`</select>` +
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`</form>`;
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}
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protected InnerUpdate(element) {
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var e = document.getElementById("dropdown-" + this.id);
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if(e === null){
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return;
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}
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const self = this;
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e.onchange = (() => {
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// @ts-ignore
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var index = parseInt(e.selectedIndex);
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self._value.setData(self._values[index].value);
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});
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var t = this._value.data;
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for (let i = 0; i < this._values.length ; i++) {
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const value = this._values[i].value;
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if (value === t) {
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// @ts-ignore
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e.selectedIndex = i;
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}
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}
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}
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} |