File Upload with Angular Material

Question

I\'m writing an web app with AngularJS and angular-material. The problem is that there\'s no built-in component for file input in angular-material. (I feel that file uploading d

Answer 1

You can change the style by wrapping the input inside a label and change the input display to none. Then, you can specify the text you want to be displayed inside a span element. Note: here I used bootstrap 4 button style (btn btn-outline-primary). You can use any style you want.

<label class="btn btn-outline-primary">
      <span>Select File</span>
      <input type="file">
</label>

input {
  display: none;
}

Answer 2

For Angular 6+:

HTML:

<input #csvInput hidden="true" type="file" onclick="this.value=null" (change)="csvInputChange($event)" accept=".csv"/>
<button mat-flat-button color="primary" (click)="csvInput.click()">Choose Spreadsheet File (CSV)</button>

Component method:

  csvInputChange(fileInputEvent: any) {
    console.log(fileInputEvent.target.files[0]);
  }

Note: This filters to just allow .csv files.

Answer 3

from jameswyse at https://github.com/angular/material/issues/3310

HTML

<input id="fileInput" name="file" type="file" class="ng-hide" multiple>
<md-button id="uploadButton" class="md-raised md-primary"> Choose Files </md-button>

CONTROLLER

    var link = function (scope, element, attrs) {
    const input = element.find('#fileInput');
    const button = element.find('#uploadButton');

    if (input.length && button.length) {
        button.click((e) => input.click());
    }
}

Worked for me.

Answer 4

File uploader with AngularJs Material and a mime type validation:

Directive:

function apsUploadFile() {
    var directive = {
        restrict: 'E',
        require:['ngModel', 'apsUploadFile'],
        transclude: true,
        scope: {
            label: '@',
            mimeType: '@',
        },
        templateUrl: '/build/html/aps-file-upload.html',
        controllerAs: 'ctrl',
        controller: function($scope) {
            var self = this;

            this.model = null;

            this.setModel = function(ngModel) {
                this.$error = ngModel.$error;

                ngModel.$render = function() {
                    self.model = ngModel.$viewValue;
                };

                $scope.$watch('ctrl.model', function(newval) {
                    ngModel.$setViewValue(newval);
                });
            };
        },
        link: apsUploadFileLink
    };
    return directive;
}

function apsUploadFileLink(scope, element, attrs, controllers) {

    var ngModelCtrl = controllers[0];
    var apsUploadFile = controllers[1];

    apsUploadFile.inputname = attrs.name;
    apsUploadFile.setModel(ngModelCtrl);

    var reg;
    attrs.$observe('mimeType', function(value) {
        var accept = value.replace(/,/g,'|');
        reg = new RegExp(accept, "i");
        ngModelCtrl.$validate();
    });

    ngModelCtrl.$validators.mimetype = function(modelValue, viewValue) {

        if(modelValue.data == null){
            return apsUploadFile.valid = true;
        }

        if(modelValue.type.match(reg)){
            return apsUploadFile.valid = true;
        }else{
            return apsUploadFile.valid = false;
        }

    };

    var input = $(element[0].querySelector('#fileInput'));
    var button = $(element[0].querySelector('#uploadButton'));
    var textInput = $(element[0].querySelector('#textInput'));

    if (input.length && button.length && textInput.length) {
        button.click(function(e) {
            input.click();
        });
        textInput.click(function(e) {
            input.click();
        });
    }

    input.on('change', function(e) {

        //scope.fileLoaded(e);
        var files = e.target.files;

        if (files[0]) {
            ngModelCtrl.$viewValue.filename = scope.filename = files[0].name;
            ngModelCtrl.$viewValue.type = files[0].type;
            ngModelCtrl.$viewValue.size = files[0].size;

            var fileReader = new FileReader();
            fileReader.onload = function () {
                ngModelCtrl.$viewValue.data = fileReader.result;
                ngModelCtrl.$validate();
            };
            fileReader.readAsDataURL(files[0]);

            ngModelCtrl.$render();
        } else {
            ngModelCtrl.$viewValue = null;
        }

        scope.$apply();
    });

}
app.directive('apsUploadFile', apsUploadFile);

html template:

<input id="fileInput" type="file" name="ctrl.inputname" class="ng-hide">
<md-input-container md-is-error="!ctrl.valid">
    <label>{@{label}@}</label>
    <input id="textInput" ng-model="ctrl.model.filename" type="text" ng-readonly="true">
    <div ng-messages="ctrl.$error" ng-transclude></div>
</md-input-container>
<md-button id="uploadButton" class="md-icon-button md-primary" aria-label="attach_file">
    <md-icon class="material-icons">cloud_upload</md-icon>
</md-button>

Exemple:

<div layout-gt-sm="row">
    <aps-upload-file name="strip" ng-model="cardDesign.strip" label="Strip" mime-type="image/png" class="md-block">
        <div ng-message="mimetype" class="md-input-message-animation ng-scope" style="opacity: 1; margin-top: 0px;">Your image must be PNG.</div>
    </aps-upload-file>
</div>

Answer 5

Based on this answer. It took some time for me to make this approach working, so I hope my answer will save someone's time.

DEMO on CodePen

Directive:

angular.module('app').directive('apsUploadFile', apsUploadFile);

function apsUploadFile() {
    var directive = {
        restrict: 'E',
        templateUrl: 'upload.file.template.html',
        link: apsUploadFileLink
    };
    return directive;
}

function apsUploadFileLink(scope, element, attrs) {
    var input = $(element[0].querySelector('#fileInput'));
    var button = $(element[0].querySelector('#uploadButton'));
    var textInput = $(element[0].querySelector('#textInput'));

    if (input.length && button.length && textInput.length) {
        button.click(function (e) {
            input.click();
        });
        textInput.click(function (e) {
            input.click();
        });
    }

    input.on('change', function (e) {
        var files = e.target.files;
        if (files[0]) {
            scope.fileName = files[0].name;
        } else {
            scope.fileName = null;
        }
        scope.$apply();
    });
}

upload.file.template.html

<input id="fileInput" type="file" class="ng-hide">
<md-button id="uploadButton"
           class="md-raised md-primary"
           aria-label="attach_file">
    Choose file
</md-button>
<md-input-container md-no-float>
    <input id="textInput" ng-model="fileName" type="text" placeholder="No file chosen" ng-readonly="true">
</md-input-container>

Answer 6

I find a way to avoid styling my own choose file button.

Because I'm using flowjs for resumable upload, I'm able to use the "flow-btn" directive from ng-flow, which gives a choose file button with material design style.

Note that wrapping the input element inside a md-button won't work.