javascript - how to splice selected element from FileList - Stack Overflow

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selected files preview with fileReader in javascript

if i remove from previewed image. it must delete from selected files!

$scope.getFile = function () {
    $scope.progress = 0;
    $scope.variant.images = [];
    var files = $scope.file;
    for ( var i = 0; i < files.length; i++) {
        var file = files[i];
        fileReader.readAsDataUrl(file, $scope).then(function(result) {
            $scope.variant.images.push({path: result})


        });
    }
};

i try like this but it does not works

angular.forEach($scope.file, function (value, key) {
        if(key === id){
            delete value;
        }
    })

selected files preview with fileReader in javascript

if i remove from previewed image. it must delete from selected files!

$scope.getFile = function () {
    $scope.progress = 0;
    $scope.variant.images = [];
    var files = $scope.file;
    for ( var i = 0; i < files.length; i++) {
        var file = files[i];
        fileReader.readAsDataUrl(file, $scope).then(function(result) {
            $scope.variant.images.push({path: result})


        });
    }
};

i try like this but it does not works

angular.forEach($scope.file, function (value, key) {
        if(key === id){
            delete value;
        }
    })

• javascript
• angularjs
• file-upload

Share Improve this question Follow asked Jan 18, 2014 at 15:50 BilegsaikhanBilegsaikhan 13433 silver badges1111 bronze badges 2

• Can we see the controller and html code? What unique indentifier are you using to identify the object you'd like to delete? – dcodesmith Commented Jan 18, 2014 at 16:06
• Any luck with the answer below? – dcodesmith Commented Jan 22, 2014 at 20:44

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 3

You cannot splice a FileList. It is readonly! It only has the length and item but no array logic like splice', 'split., etc. So you will have to make a copy from it in an array:

// **A**
$scope.fileArray = [];
angular.forEach($scope.file, function(file) {
    $scope.fileArray.push(file)
});

And then you can splice from this array with something like:

$scope.deleteImage = function(index) {
   $scope.fileArray.splice(index, 1);
})

As you mention 'preview' I guess you are displaying a thumbnail of the selected images. You will have to change any display logic also to use the fileArray instead of the current file. So it automatically updates when the user removes one element.

<div ng-repeat="image in fileArray"... >

So best to set up an angular watch to recalculate $scope.fileArray as given above. However I'm afraid you cannot do a $watch on a file list. Not certain, but I recently found out that Angular does NOT support ng-model on a <input type="file". I found a solution for this in this article.

So if a simple $scope.$watch('file', function.. doesn't work, you'd best import use the fileModel directive in that into your system and enhance the file-input in your view with it:

<input type="file" name="files" file-model="filesArray" multiple accept="image"/>

You should then be able to watch that filesArray you assign to it:

$scope.$watch('fileArray', function() {
    // Code from **A**
    ....
});

You can use native JS Array#forEach function as it gives you access the index of the object in the array.

I used id assuming you are actually passing an id in to the function to identify the object that needs to be deleted from the array. Looking at your code above, name seems more ideal, if that's unique property in the object of course

$scope.file.forEach(function(file, index){

    if (file.id === id){ // Where id is your identifier, could be file.name === name.
        this.splice(index, 1);
    }

});

selected files preview with fileReader in javascript

if i remove from previewed image. it must delete from selected files!

$scope.getFile = function () {
    $scope.progress = 0;
    $scope.variant.images = [];
    var files = $scope.file;
    for ( var i = 0; i < files.length; i++) {
        var file = files[i];
        fileReader.readAsDataUrl(file, $scope).then(function(result) {
            $scope.variant.images.push({path: result})


        });
    }
};

i try like this but it does not works

angular.forEach($scope.file, function (value, key) {
        if(key === id){
            delete value;
        }
    })

selected files preview with fileReader in javascript

if i remove from previewed image. it must delete from selected files!

$scope.getFile = function () {
    $scope.progress = 0;
    $scope.variant.images = [];
    var files = $scope.file;
    for ( var i = 0; i < files.length; i++) {
        var file = files[i];
        fileReader.readAsDataUrl(file, $scope).then(function(result) {
            $scope.variant.images.push({path: result})


        });
    }
};

i try like this but it does not works

angular.forEach($scope.file, function (value, key) {
        if(key === id){
            delete value;
        }
    })

• javascript
• angularjs
• file-upload

Share Improve this question Follow asked Jan 18, 2014 at 15:50 BilegsaikhanBilegsaikhan 13433 silver badges1111 bronze badges 2

• Can we see the controller and html code? What unique indentifier are you using to identify the object you'd like to delete? – dcodesmith Commented Jan 18, 2014 at 16:06
• Any luck with the answer below? – dcodesmith Commented Jan 22, 2014 at 20:44

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 3

You cannot splice a FileList. It is readonly! It only has the length and item but no array logic like splice', 'split., etc. So you will have to make a copy from it in an array:

// **A**
$scope.fileArray = [];
angular.forEach($scope.file, function(file) {
    $scope.fileArray.push(file)
});

And then you can splice from this array with something like:

$scope.deleteImage = function(index) {
   $scope.fileArray.splice(index, 1);
})

As you mention 'preview' I guess you are displaying a thumbnail of the selected images. You will have to change any display logic also to use the fileArray instead of the current file. So it automatically updates when the user removes one element.

<div ng-repeat="image in fileArray"... >

So best to set up an angular watch to recalculate $scope.fileArray as given above. However I'm afraid you cannot do a $watch on a file list. Not certain, but I recently found out that Angular does NOT support ng-model on a <input type="file". I found a solution for this in this article.

So if a simple $scope.$watch('file', function.. doesn't work, you'd best import use the fileModel directive in that into your system and enhance the file-input in your view with it:

<input type="file" name="files" file-model="filesArray" multiple accept="image"/>

You should then be able to watch that filesArray you assign to it:

$scope.$watch('fileArray', function() {
    // Code from **A**
    ....
});

You can use native JS Array#forEach function as it gives you access the index of the object in the array.

I used id assuming you are actually passing an id in to the function to identify the object that needs to be deleted from the array. Looking at your code above, name seems more ideal, if that's unique property in the object of course

$scope.file.forEach(function(file, index){

    if (file.id === id){ // Where id is your identifier, could be file.name === name.
        this.splice(index, 1);
    }

});

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