devdocs/assets/javascripts/views/pages/jquery.js

//= require views/pages/base

app.views.JqueryPage = class JqueryPage extends app.views.BasePage {
  static demoClassName = "_jquery-demo";

  afterRender() {
    // Prevent jQuery Mobile's demo iframes from scrolling the page
    for (var iframe of this.findAllByTag("iframe")) {
      iframe.style.display = "none";
      this.onIframeLoaded = this.onIframeLoaded.bind(this);
      $.on(iframe, "load", this.onIframeLoaded);
    }

    return this.runExamples();
  }

  onIframeLoaded(event) {
    event.target.style.display = "";
    $.off(event.target, "load", this.onIframeLoaded);
  }

  runExamples() {
    for (var el of this.findAllByClass("entry-example")) {
      try {
        this.runExample(el);
      } catch (error) {}
    }
  }

  runExample(el) {
    let iframe;
    const source = el.getElementsByClassName("syntaxhighlighter")[0];
    if (!source || source.innerHTML.indexOf("!doctype") === -1) {
      return;
    }

    if (!(iframe = el.getElementsByClassName(JqueryPage.demoClassName)[0])) {
      iframe = document.createElement("iframe");
      iframe.className = JqueryPage.demoClassName;
      iframe.width = "100%";
      iframe.height = 200;
      el.appendChild(iframe);
    }

    const doc = iframe.contentDocument;
    doc.write(this.fixIframeSource(source.textContent));
    doc.close();
  }

  fixIframeSource(source) {
    source = source.replace(
      '"/resources/',
      '"https://api.jquery.com/resources/',
    ); // attr(), keydown()
    source = source.replace(
      "</head>",
      `\
<style>
  html, body { border: 0; margin: 0; padding: 0; }
  body { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; }
</style>
<script>
  $.ajaxPrefilter(function(opt, opt2, xhr) {
    if (opt.url.indexOf('http') !== 0) {
      xhr.abort();
      document.body.innerHTML = "<p><strong>This demo cannot run inside DevDocs.</strong></p>";
    }
  });
</script>
</head>\
`,
    );
    return source.replace(/<script>/gi, '<script nonce="devdocs">');
  }
};