75 lines
2.6 KiB
TypeScript
75 lines
2.6 KiB
TypeScript
export class HtmlUtils {
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public static getElementByIdOrFail<T extends HTMLElement>(id: string): T {
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const elem = document.getElementById(id);
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if (HtmlUtils.isHtmlElement<T>(elem)) {
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return elem;
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}
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throw new Error("Cannot find HTML element with id '" + id + "'");
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}
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public static getElementById<T extends HTMLElement>(id: string): T | undefined {
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const elem = document.getElementById(id);
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return HtmlUtils.isHtmlElement<T>(elem) ? elem : undefined;
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}
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public static querySelectorOrFail<T extends HTMLElement>(selector: string): T {
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const elem = document.querySelector<T>(selector);
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if (HtmlUtils.isHtmlElement<T>(elem)) {
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return elem;
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}
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throw new Error("Cannot find HTML element with selector '" + selector + "'");
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}
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public static removeElementByIdOrFail<T extends HTMLElement>(id: string): T {
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const elem = document.getElementById(id);
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if (HtmlUtils.isHtmlElement<T>(elem)) {
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elem.remove();
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return elem;
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}
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throw new Error("Cannot find HTML element with id '" + id + "'");
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}
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public static escapeHtml(html: string): string {
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const text = document.createTextNode(html);
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const p = document.createElement("p");
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p.appendChild(text);
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return p.innerHTML;
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}
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public static urlify(text: string, style: string = ""): string {
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const urlRegex = /(https?:\/\/[^\s]+)/g;
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text = HtmlUtils.escapeHtml(text);
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return text.replace(urlRegex, (url: string) => {
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url = HtmlUtils.htmlDecode(url);
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const link = document.createElement("a");
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link.href = url;
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link.target = "_blank";
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const text = document.createTextNode(url);
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link.appendChild(text);
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link.setAttribute("style", style);
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return link.outerHTML;
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});
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}
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private static htmlDecode(input: string): string {
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const doc = new DOMParser().parseFromString(input, "text/html");
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const text = doc.documentElement.textContent;
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if (text === null) {
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throw new Error("Unexpected non parseable string");
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}
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return text;
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}
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public static isClickedInside(event: MouseEvent, target: HTMLElement): boolean {
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return !!event.composedPath().find((et) => et === target);
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}
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public static isClickedOutside(event: MouseEvent, target: HTMLElement): boolean {
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return !this.isClickedInside(event, target);
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}
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private static isHtmlElement<T extends HTMLElement>(elem: HTMLElement | null): elem is T {
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return elem !== null;
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}
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}
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