grapesjs/src/code_manager/model/JsGenerator.js

define(['backbone'], function (Backbone) {

    return Backbone.Model.extend({

      mapModel: function (model) {
        var code = '';
        var script  = model.get('script');
        var type  = model.get('type');
        var comps  = model.get('components');
        var id = model.cid;

        if (script) {
          // If the component has scripts we need to expose his ID
          var attr = model.get('attributes');
          attr = _.extend({}, attr, {id: id});
          model.set('attributes', attr);

          var scrStr = 'function(){' + script + '}';
          scrStr = typeof script == 'function' ? script.toString() : scrStr;

          // If the script was updated, I'll put its code in a separate container
          if (model.get('scriptUpdated')) {
              this.mapJs[type+'-'+id] = {ids: [id], code: scrStr};
          } else {
            var mapType = this.mapJs[type];

            if(mapType) {
              mapType.ids.push(id);
            } else {
              this.mapJs[type] = {ids: [id], code: scrStr};
            }
          }
        }

        comps.each(function(model) {
          code += this.mapModel(model);
        }, this);

        return code;
      },

      build: function(model) {
        this.mapJs = {};
        this.mapModel(model);

        var code = '';

        for(var type in this.mapJs) {
          var mapType = this.mapJs[type];
          var ids = '#' + mapType.ids.join(', #');
          code += 'var items = document.querySelectorAll("'+ids+'");' +
            'for (var i = 0, len = items.length; i < len; i++) {'+
              '(' + mapType.code + '.bind(items[i]))();' +
            '}';
        }


        return code;
      },

    });
});