var imghandler = function()

in themes/docsy/assets/js/drawio.js [23:72]
18 lines of code
2 McCabe index (conditional complexity)

  var imghandler = function (img, imgdata) {
    var url = {{ .drawio_server | default "https://embed.diagrams.net/" | jsonify }};
    url += '?embed=1&ui=atlas&spin=1&modified=unsavedChanges&proto=json&saveAndEdit=1&noSaveBtn=1';

    var wrapper = document.createElement('div');
    wrapper.classList.add('drawio');
    img.parentNode.insertBefore(wrapper, img);
    wrapper.appendChild(img);

    var btn = document.createElement('button');
    btn.classList.add('drawiobtn');
    btn.insertAdjacentHTML('beforeend', '<i class="fas fa-edit"></i>');
    wrapper.appendChild(btn);

    btn.addEventListener('click', function (evt) {
      if (iframe) return;
      insertFrame();
      var handler = function (evt) {
        var wind = iframe.contentWindow;
        if (evt.data.length > 0 && evt.source == wind) {
          var msg = JSON.parse(evt.data);

          if (msg.event == 'init') {
            wind.postMessage(JSON.stringify({action: 'load', xml: imgdata}), '*');

          } else if (msg.event == 'save') {
            var fmt = imgdata.indexOf('data:image/png') == 0 ? 'xmlpng' : 'xmlsvg';
            wind.postMessage(JSON.stringify({action: 'export', format: fmt}), '*');

          } else if (msg.event == 'export') {
            const fn = img.src.replace(/^.*?([^/]+)$/, '$1');
            const dl = document.createElement('a');
            dl.setAttribute('href', msg.data);
            dl.setAttribute('download', fn);
            document.body.appendChild(dl);
            dl.click();
            dl.parentNode.removeChild(dl);
          }

          if (msg.event == 'exit' || msg.event == 'export') {
            window.removeEventListener('message', handler);
            closeFrame();
          }
        }
      };

      window.addEventListener('message', handler);
      iframe.setAttribute('src', url);
    });
  };