46 lines
1.6 KiB
TypeScript
46 lines
1.6 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 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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private 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): 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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return '<a href="' + url + '" target="_blank" style=":visited {color: white}">' + url + '</a>';
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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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