html-pdf-chrome/dist/CompletionTriggers/Element.js

HTML to PDF and image converter via Chrome/Chromium

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
exports.Element = void 0;
const CompletionTrigger_1 = require("./CompletionTrigger");
/**
 * Waits for a DOM element to appear.
 *
 * @export
 * @class Element
 * @extends {CompletionTrigger}
 */
class Element extends CompletionTrigger_1.CompletionTrigger {
    /**
     * Creates an instance of the Element CompletionTrigger.
     * @param {string} cssSelector the element to listen for.
     * @param {number} [timeout] ms to wait until timing out.
     * @memberof Element
     */
    constructor(cssSelector, timeout) {
        super(timeout);
        this.cssSelector = cssSelector;
    }
    async wait(client) {
        const { Runtime } = client;
        return Runtime.evaluate({
            awaitPromise: true,
            expression: `
        new Promise((resolve, reject) => {
          new MutationObserver((mutations, observer) => {
            mutations.forEach((mutation) => {
              if ([...mutation.addedNodes].find((node) => node.matches('${this.cssSelector}'))) {
                observer.disconnect();
                resolve();
              }
            });
          }).observe(document.body, { childList: true });
          setTimeout(() => reject('${this.timeoutMessage}'), ${this.timeout});
        })`,
        });
    }
}
exports.Element = Element;
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