51 lines
1.8 KiB
TypeScript
51 lines
1.8 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 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.replace(/(\r\n|\r|\n)/g, "<br/>"));
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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): 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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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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return link.outerHTML;
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});
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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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