jquery - Backbone model change event not firing after setting model -

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i took non kosher approach , used $.ajax() ajax file upload because @ moment can't figure out "backbone" way. picture has been uploaded , ajax request sends new backbone model in json, populated filename of new photo. model not firing change event can't populate profile picture. see success function below.

    getfile:function(e){         e.preventdefault();         = this;         var file = e.target.files[0];         name = file.name;         size = file.size;         type = file.type;         var formdata = new formdata($('#upload-child-pic-form')[0]);         console.log(this,'currentuploadu',this.currentupload);         formdata.append('child_id',this.currentupload);         $.ajax({             url: '/children/upload/',             type: 'post',             xhr: function() {              var myxhr = $.ajaxsettings.xhr();                 if(myxhr.upload){                      myxhr.upload.addeventlistener('progress',function(data){                         $("#upload-child-pic-progress").val(data.position / data.totalsize * 100);                     }, false);                  }                 return myxhr;             },             //ajax events             beforesend: function(data){                 $("#upload-child-pic-progress").removeclass('hide');             },             success: function(data){                 $("#upload-child-pic-progress").addclass('hide');                 $("#add-child-profile-pics-modal").modal('hide');                 var sentdata = $.parsejson(data);                 var thischild = that.children.get(sentdata.id);                 thischild.set("photo",sentdata.photo);                 thischild.trigger('change');             },             error: function(data){                 console.log('error',data);             },             // form data             data: formdata,             //options tell jquery not process data or worry content-type.             cache: false,             contenttype: false,             processdata: false         });     },

you missing var before variables , other variables...

having these variable global menace, can changed/overwritten outside of scope before success callback called. 

that = this; //should - 'var = this;'

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