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HTML

              
                <div class="container">
  <h1>Backbone forms</h1>
  <p>dynamic fields</p>
</div>
              
            
!

CSS

              
                /* custom rules */
ul{
  list-style-type: none;
}

[data-target="help"] .help-block {
   display: none;
   color: #c09853;
   padding: 8px 35px 8px 14px;
   text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
   background-color: #fcf8e3;
   border: 1px solid #fbeed5;
   -webkit-border-radius: 0;
   -moz-border-radius: 0;
   border-radius: 0;
   margin-top: 20px;  
}
              
            
!

JS

              
                console.clear();

$(function () {
    'use strict';
  
    var Field = function (form, editor) {
      this.form = form;
      this.editor = editor;
    };

    Field.prototype = {
      // actual callbacks
      toggleCheckbox: function () {
         return (_.isEqual(this.getValue(),this.getCondition())) ? this.showTarget() : this.hideTarget(); 
      },

      toggleRadio: function () {  
        console.log('%ccondition:', 'color: white; background: chocolate', this.getCondition());
        console.log('%cvalue:', 'color: white; background: LightCoral ', this.getValue());
               
        var passTest = _.some(this.getCondition(), function(item){
          return _.isEqual(item, this.getValue());
        }, this);
        
        return (passTest) ? this.showTarget() : this.hideTarget(); 
      },
      
      toggleHelp: function () {        
        return (_.isEqual(this.getValue(),this.getCondition()[0])) ? this.showHelp() : this.hideHelp(); 
      },
        
      getWaisteToHipRatio: function () {
            console.group('getWaisteToHipRatio');
            console.log('%cvalues to divide: %o', 'color: lime; background: #444', this.getTarget());
            console.groupEnd();
            var fields =  this.getTarget();
        
            this.form.on(this.getEvents(), function (form, editor) {
                var a = +form.fields[fields[0]].getValue();
                var b = +form.fields[fields[1]].getValue();                      
                var result = _.isNaN(this.divide(a, b)) ? '' : this.divide(a, b).toFixed(2);
                this.editor.setValue(result);
            }, this);
      },
      
      getSumOfSkinFolds: function () {
            console.group('getSumOfSkinFolds');
              console.log('%cvalues to sum: %o', 'color: lime; background: #444', this.getTarget());
            console.groupEnd();

            var fields = this.getTarget();

            //TODO do it better with _.values() + _.reduce() 
            this.form.on(this.getEvents(), function (form, editor) {
                var a = +form.fields[fields[0]].getValue();
                var b = +form.fields[fields[1]].getValue();
                var c = +form.fields[fields[2]].getValue();
                var d = +form.fields[fields[3]].getValue();
                var sum = _.reduce([a, b, c, d], function (memo, num) {
                    return memo + num;
                }, 0);

                var result = _.isNaN(sum) ? '' : sum.toFixed();
                this.editor.setValue(result);
            }, this);
        },
      
        getLeanBodyMass: function () {
            console.group('getLeanBodyMass');
              console.log('%cCalculation = Body Weight - (Body Weight x Body Fat%) %o', 'color: lime; background: #444', this.getTarget());
            console.groupEnd();

            var fields = this.getTarget();
          
            //TODO do it better with _.values() + _.reduce() 
            this.form.on(this.getEvents(), function (form, editor) {
                var a = +form.fields[fields[0]].getValue();
                var b = +form.fields[fields[1]].getValue();              
              
                //Calculation = Body Weight - (Body Weight x Body Fat%)    Body Fat = 0.0(5)
                var result =  this.subtract(a, this.multiply(a, this.divide(b, 100)).toFixed(2));
              this.editor.setValue( _.isNaN(result) ? '' : result);
            }, this);
        },
         
      // helper funcntions
      getTarget: function () {
        return this.editor.$el.data('target').split(',');
      },
      
      getEvents: function() {
        return _.map(this.getTarget(), function(field){
              return field + ':change';
        }).join(' ');
      },
      
      getCondition: function () {
        return this.editor.$el.data('condition').split(',');        
      },
      
      getValue: function () {
        return this.editor.getValue();
      },
      
      hideHelp: function () {
        this.editor.$el.find('.' + this.getTarget() + '-block').slideUp(200);
      },
      
      showHelp: function () {
         this.editor.$el.find('.' + this.getTarget() + '-block').slideDown(200); 
      },

      hideTarget: function () {
        var fieldType;
        
        _.each(this.getTarget(), function (fieldName) {
          
          //console.info('filed', fieldName);
          //console.log('Editor', this.form.fields[fieldName].editor);
          //console.log('Editor schema type', this.form.schema[fieldName].type);
          
          fieldType = this.form.schema[fieldName].type;
                 
          switch(fieldType) {
              case 'TextArea':
                  this.form.fields[fieldName].$el.find('textarea').val(''); 
                  break;
              case 'Radio':
                  this.form.fields[fieldName].$el.find('[name=' + fieldName +']').prop('checked', false);
                  break;
              default:
                  return;
          };
                    
          //this.form.commit();
          //console.log('commited', this.form);
          this.form.fields[fieldName].$el.hide();       
        },this);
      },

      showTarget: function () {
        _.each(this.getTarget(), function (field) {
          this.form.fields[field].$el.slideDown(200);
        }, this);
      },
      
      subtract: function (x, y) {
        return x - y;
      },

      multiply: function (x, y) {
        return x * y;
      },
      
      divide: function (a, b) {
        return (b === 0) ? a : (a / b);
      },

      bind: function (callback) {
        this.form.on(this.editor.key + ':change', function () {
          this[callback]();
        }, this);
      },

      init: function (callback) {     
        console.log('callback', callback);        
        if(_.isFunction(this[callback])) {
          this[callback]();
          this.bind(callback);
        }
      }
    };

    // let's assume this object we get from server
    var serverResponse = {
      // describe fields
      schema: {
        medical01: {
          type: "Radio",
          title: "Do you experience an irregular or racing heart rate during rest or exercise?",
          options: [
            {
              val: "yes",
              label: "Yes"
            },{
              val: "no",
              label: "No"
            }
          ],
          help: "we recommend that you see a doctor before your Equifit or before you begin an exercise program.",
          fieldAttrs: {
            "data-bind": "toggleHelp",
            "data-target": "help",
            "data-condition": "yes"
          }
        },
        
        'medical01-dynamic': {
          type: 'Checkboxes',
          title: 'Head or <b>Neck</b>',
          fieldAttrs: {
            'data-bind': 'toggleCheckbox',
            'data-target': 'medical01-dynamic-01,medical01-dynamic-02,medical01-dynamic-03',
            'data-condition': "medical13-1"
          },
          "options": [
            {
              "val": "medical13-1",
              "label": "Hip"
            }
          ]
        },

        'medical01-dynamic-01': {
          type: 'TextArea',
          title: 'Area (Left, Right / Upper, Mid, Lower)',
          editorAttrs: {maxlength: 100, title: 'Tooltip help'}
        },

        'medical01-dynamic-02': {
          type: 'TextArea',
          title: 'When it happened?'
        },
        
        'medical01-dynamic-03': {
          type: 'Radio',
          title: 'Do you drink?',
          options: [{
            val: 'yes',
            label: 'Yes'
          }, {
            val: 'no',
            label: 'No'
          }]
        },
        
        

        drink: {
          type: 'Radio',
          title: 'Do you drink?',
          options: [{
            val: 'yes',
            label: 'Yes'
          }, {
            val: 'no',
            label: 'No'
          }],
          fieldAttrs: {
            'data-bind': 'toggleRadio',
            'data-target': 'beer,milk',
            'data-condition': 'yes'
          }
        },

        beer: {
          type: 'Text',
          title: 'only beer',
          help: 'good choice'
        },

        milk: {
          type: 'Text',
          title: 'goat milk',
          help: 'you need help'
        },
        
        
        // three radios
        goal: {
          type: 'Radio',
          title: 'Have you ever achieved this goal in the past?',
          options: [{
            val: 'yes',
            label: 'Yes'
          }, {
            val: 'no',
            label: 'No'
          },{
            val: 'partialy',
            label: 'Partialy'
          }],
          fieldAttrs: {
            'data-bind': 'toggleRadio',
            'data-target': 'goalHow',
            'data-condition': 'yes'
          }
        },
  
        goalHow: {
            type: 'TextArea',
            title: 'if so, when and how?',
            editorAttrs: {maxlength: 50}
        },
        
        // toggle 5 radio buttons, show extra only for 1,2,3,4 options
        goals14: {
          type: "Radio",
          title: "On a scale of 1 - 5, how committed are you to each goal?",
          fieldClass: "bbf-radiobuttons",
          fieldAttrs: {
            "data-bind": "toggleRadio",
            "data-target": "goals14-dynamic1",
            "data-condition": "goals14-1,goals14-2,goals14-3,goals14-4"
          },
          options: [
            {
              "val": "goals14-1",
              "label": "1"
            },
            {
              "val": "goals14-2",
              "label": "2"
            },
            {
              "val": "goals14-3",
              "label": "3"
            },
            {
              "val": "goals14-4",
              "label": "4"
            },
            {
              "val": "goals14-5",
              "label": "5"
            }
          ]
        },
        
        "goals14-dynamic1": {
          "type": "TextArea",
          "title": "If you are not a 5 out 5 committed, what would make you a 5?",
          "editorAttrs": {"maxlength": 100}
        },

        waist: {
          type: 'Text',
          title: 'Waist Circumference',
          editorClass: 'input-small',
          help: 'inches'
        },
        
        hip: {
          type: 'Text',
          title: 'Hip Circumference',
          editorClass: 'input-small',
          help: 'inches'
        },
        
        waistHipRatio: {
          type: 'Text',
          title: 'Waist to Hip Ratio',
          editorClass: 'input-small',
          editorAttrs: {
            readonly: true
          },
          fieldAttrs: {
            'data-bind': 'getWaisteToHipRatio',
            'data-target': 'waist,hip'
          }  
        },
        
        tricep: {
          type: "Text",
          title: "tricep",
          editorClass: 'input-small',
          help: 'mm'
        },
        abdomen: {
          type: "Text",
          title: "abdomen",
          editorClass: 'input-small',
          help: 'mm'
        },
        suprailiac: {
          type: "Text",
          title: "suprailiac",
          editorClass: 'input-small',
          help: 'mm'
        },
        midThigh: {
          type: "Text",
          title: "midThigh",
          editorClass: 'input-small',
          help: 'mm'
        },
        sumOfSkinFolds: {
          type: "Text",
          title: "Sum of skin folds",
          editorClass: 'input-small',
          editorAttrs: {
            readonly: true
          },
          fieldAttrs: {
            'data-bind': 'getSumOfSkinFolds',
            'data-target': 'tricep,abdomen,suprailiac,midThigh'
          }
        },
        
        bodyWeight: {
          type: "Text",
          title: "Weight",
          editorClass: 'input-small',
          help: 'lbs'
          
        },
        
        bodyFat: {
          type: "Text",
          title: "Body Fat Percentage",
          editorClass: 'input-small',
          help: '%'
        },
        
        leanBodyMass: {
          type: "Text",
          title: "Lean Body Mass",
          editorClass: 'input-small',
          editorAttrs: {
            readonly: true
          },
          help: 'lbs',
          fieldAttrs: {
            'data-bind': 'getLeanBodyMass',
            'data-target': 'bodyWeight,bodyFat'
          }
        }
        
      },

      fieldsets: [{
          legend: 'Toggle Help',
          fields: [ 'medical01']
        },
        {
          legend: 'Toggle checkbox',
          fields: ['medical01-dynamic','medical01-dynamic-01','medical01-dynamic-02', 'medical01-dynamic-03']
        },
        {
          legend: 'Toggle radio Yes/No',
          fields: ['drink','milk','beer']
        },
        {
          legend: 'Toggle radio Yes/No/Partialy',
          fields: ['goal', 'goalHow']
        },
                  
        {
          legend: 'Toggle radio 1,2,3,4 and 5',
          fields: ['goals14', 'goals14-dynamic1']
        },
        {
          legend: 'Body measurements',
          fields: ['waist', 'hip', 'waistHipRatio']
        },
        {
          legend: 'Skinfold Measurement',
          fields: [
            'tricep',
            'abdomen',
            'suprailiac',
            'midThigh',
            'sumOfSkinFolds']
        }, 
        {
          legend: 'Lean Body Mass(lbs)',
          fields: [
            'bodyWeight',
            'bodyFat',
            'leanBodyMass']
        }
      ],

      // data will be populte these fields
      data: {
        
        tricep: 'some text'
      }
    };


// these all Front End stuff.
    var User = Backbone.Model.extend({
        schema: serverResponse.schema,
    });

// you can load data in model instance or as a defaults
    var user = new User(serverResponse.data);

    var form = new Backbone.Form({
        model: user,
        fieldsets: serverResponse.fieldsets
    }).render();

    _.each(form.fields, function (editor) {
        //console.log('editor', editor);
        if (editor.$el.data('bind')) {
            var callback = editor.$el.data('bind'),
                field = new Field(form, editor);
            field.init(callback);
        }
    }, this);

    $('.container').append(form.el);
});

              
            
!
999px

Console