grapesjs/src/dom_components/view/ComponentScriptView.js

define(['backbone', './ComponentImageView'],
  function (Backbone, ComponentView) {

  return ComponentView.extend({

    tagName: 'script',

    events: {},

    render: function() {
      var model = this.model;
      var src = model.get('src');
      var em = this.em;
      var scriptCount = em && em.get('scriptCount') ? em.get('scriptCount') : 0;
      var content = '';

      // If it's an external script
      if(src) {
        var onload = model.get('onload');
        var svar = 'script' + scriptCount;
        var svarNext = 'script' + (scriptCount + 1);
        content = "var "+svar+" = document.createElement('script');\n" +
          svar+".onload = function(){\n" +
            (onload ? onload + "();\n" : '') +
            "typeof "+svarNext+"Start == 'function' && "+svarNext+"Start();\n" +
          "};\n" +
          svar+".src = '" + src + "';\n"+
          "function "+svar+"Start() { document.body.appendChild("+svar+"); };\n" +
          (!scriptCount ? svar+"Start();" : '');
        if(em){
            em.set('scriptCount', scriptCount + 1);
        }
      } else {
        content = model.get('content');
      }

      this.el.innerHTML = content;
      return this;
    },

  });
});