gaurav gupta gaurav gupta - 5 months ago 67
Node.js Question

nodejs + multer + angularjs for uploading without redirecting

I am using Nodejs + Multer +angularjs for uploading files on the server.


i have a simple HTML file:

<form action="/multer" method="post" enctype="multipart/form-data">
<input type="file" id="photo" name="photo"/>
<button id="Button1">Upload</button>
</form>


Nodejs part:

var multer = require('multer');

var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, './uploads/')
},
filename: function (req, file, cb) {
cb(null, file.originalname)
}
})

app.post('/multer', upload.single('photo'), function (req, res) {
res.end("File uploaded.");
});


this works perfectly and the file is successfully uploaded.


but this redirect me to "/multer" after uploading the file (because of the form element).

How do i stay on the same page??..possibly using angularjs

so i tried this:



making a HTML angular file:

<section data-ng-controller="myCtrl">
<input type="file" id="photo" name="photo"/>
<button id="Button1" ng-click="f()">Upload</button>
</section>


and a Angularjs controller:

angular.module('users').controller('myCtrl',[$scope,function($scope){
$scope.f=function(){
var photo = document.getElementById('photo');
var file = photo.files[0];
if (file) {

//code to make a post request with a file object for uploading?????

//something like..
//$http.post('/multer', file).success(function(response) {
//console.log("success");
//});
}
}
}]);




CAN SOMEONE HELP ME WITH THE CODE FOR MAKING A POST REQUEST WITH A FILE OBJECT FOR UPLOADING USING MULTER FROM ANGULARJS CONTROLLER ?




thanks

Answer

Angularjs directive:

angular.module('users').directive('fileModel', ['$parse', function ($parse) {
return {
    restrict: 'A',
    link: function(scope, element, attrs) {
        var model = $parse(attrs.fileModel);
        var modelSetter = model.assign;

        element.bind('change', function(){
            scope.$apply(function(){
                modelSetter(scope, element[0].files[0]);
            });
        });
    }
};
}]);

Angular html file:

<input type="file" file-model="myFile"/><br><br>
<button ng-click="uploadFile()">Upload</button>

Angularjs Controller:

$scope.uploadFile = function(){

        var file = $scope.myFile;
        var uploadUrl = "/multer";
        var fd = new FormData();
        fd.append('file', file);

        $http.post(uploadUrl,fd, {
            transformRequest: angular.identity,
            headers: {'Content-Type': undefined}
        })
        .success(function(){
          console.log("success!!");
        })
        .error(function(){
          console.log("error!!");
        });
    };

Nodejs server route file:

var multer  = require('multer');
var storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, './uploads/')
    },
    filename: function (req, file, cb) {
        cb(null, file.originalname+ '-' + Date.now()+'.jpg')
    }
});
var upload = multer({ storage: storage });

app.post('/multer', upload.single('file'));

Enjoy!

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