Trigger a function when the value of the file input field changes using ng-change

Question

Trigger a function when the value of the file input field changes using ng-change

I'm attempting to trigger my upload() function when the file input changes, but I'm having trouble getting it to work.

This is the HTML code:

<input type="file" ng-model="image" ng-change="uploadImage()">

And here's the corresponding JavaScript code:

$scope.uploadImage = function() {
    console.log('Changed');
}

Can anyone spot what mistake I might be making?

javascript angularjs

Answer 1

Answer №1

Give this a shot:- http://jsfiddle.net/adiioo7/fA969/

JavaScript Code:-

function myFunction($scope) {
    $scope.uploadFile = function () {
        console.log("Updated");
    }
}

HTML Markup:-

<div ng-app ng-controller="myFunction">
    <input type="file" ng-model="file" onchange="angular.element(this).scope().uploadFile()" />
</div>

Answer 2

Give this a shot:- http://jsfiddle.net/adiioo7/fA969/

JavaScript Code:-

function myFunction($scope) {
    $scope.uploadFile = function () {
        console.log("Updated");
    }
}

HTML Markup:-

<div ng-app ng-controller="myFunction">
    <input type="file" ng-model="file" onchange="angular.element(this).scope().uploadFile()" />
</div>

Answer 3

Answer №2

If you're looking for a solution that works in production mode, I've created a directive that can help with your file upload needs. Here's how you can use it:

<input ng-upload-change="fileChanged($event)" />

In your controller:

$scope.fileChanged = function($event){
    var files = $event.target.files;
}

Don't forget to include the directive in your code:

angular.module("YOUR_APP_NAME").directive("ngUploadChange",function(){
    return{
        scope:{
            ngUploadChange:"&"
        },
        link:function($scope, $element, $attrs){
            $element.on("change",function(event){
                $scope.$apply(function(){
                    $scope.ngUploadChange({$event: event})
                })
            })
            $scope.$on("$destroy",function(){
                $element.off();
            });
        }
    }
});

No need for attributions - this code is in the public domain.

Just keep in mind that if a user selects a file, closes the input, and then selects the same file again, the change function won't trigger. To address this issue, I've developed a more comprehensive directive that replaces the input each time it's used. You can find it on github here:

https://github.com/dtruel/angular-file-input/tree/master

Answer 4

If you're looking for a solution that works in production mode, I've created a directive that can help with your file upload needs. Here's how you can use it:

<input ng-upload-change="fileChanged($event)" />

In your controller:

$scope.fileChanged = function($event){
    var files = $event.target.files;
}

Don't forget to include the directive in your code:

angular.module("YOUR_APP_NAME").directive("ngUploadChange",function(){
    return{
        scope:{
            ngUploadChange:"&"
        },
        link:function($scope, $element, $attrs){
            $element.on("change",function(event){
                $scope.$apply(function(){
                    $scope.ngUploadChange({$event: event})
                })
            })
            $scope.$on("$destroy",function(){
                $element.off();
            });
        }
    }
});

No need for attributions - this code is in the public domain.

Just keep in mind that if a user selects a file, closes the input, and then selects the same file again, the change function won't trigger. To address this issue, I've developed a more comprehensive directive that replaces the input each time it's used. You can find it on github here:

https://github.com/dtruel/angular-file-input/tree/master

Answer 5

Answer №3

If you're looking for an alternative method to detect changes in file input, one interesting approach is to use a watch on the ng-model attribute of the input file.

Here's an example:

HTML ->

<input type="file" file-model="change.fnEvidence">

JS Code ->

$scope.$watch('change.fnEvidence', function() {
                    alert("has changed");
                });

I hope you find this useful.

Answer 6

If you're looking for an alternative method to detect changes in file input, one interesting approach is to use a watch on the ng-model attribute of the input file.

Here's an example:

HTML ->

<input type="file" file-model="change.fnEvidence">

JS Code ->

$scope.$watch('change.fnEvidence', function() {
                    alert("has changed");
                });

I hope you find this useful.

Answer 7

Answer №4

Make sure to utilize ng-file-select="upload($files)" for file selection.

'<input type="file" class="form-control" ng-model="alunos.file" accept="image/*" ng-file-select="upload($files)"/>'

To define the upload function, use:

$scope.upload = function(file){
    console.log(file);
};

Answer 8

Make sure to utilize ng-file-select="upload($files)" for file selection.

'<input type="file" class="form-control" ng-model="alunos.file" accept="image/*" ng-file-select="upload($files)"/>'

To define the upload function, use:

$scope.upload = function(file){
    console.log(file);
};

Trigger a function when the value of the file input field changes using ng-change

Answer №1

Give this a shot:- http://jsfiddle.net/adiioo7/fA969/

Answer №2

Answer №3

Answer №4

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