AngularJs: How to check for changes in file input fields?

AngularJs: How to check for changes in file input fields? 📂

Are you new to Angular and struggling to read the uploaded file path from an HTML 'file' field whenever a 'change' happens? Don't worry, we've got you covered! 🤗

The Problem: `ng-change` not working for file input fields 😕

In the given code snippet, the $scope.fileNameChaged() function is not being called when using ng-change with the file input field. This can be quite frustrating, especially for someone who is just starting out with Angular.

<div ng-controller="form-cntlr">
    <form>
        <button ng-click="selectFile()">Upload Your File</button>
        <input type="file" style="display:none" id="file" name='file' ng-Change="fileNameChaged()"/>
    </form>  
</div>

The Solution: Utilizing `ng-file-select` directive 🎉

To overcome this issue, we can use the ng-file-select directive from the ng-file-upload library. This directive acts as a bridge between Angular and the file input field, allowing us to detect file changes easily.

First, you need to install the ng-file-upload library by adding the following CDN link to your HTML file:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ng-file-upload/12.2.13/ng-file-upload.min.js"></script>

Next, let's modify the code to use the ng-file-select directive:

<script>
    var DemoModule = angular.module("Demo", ['ngFileUpload']);
    DemoModule.controller("form-cntlr", function($scope, Upload) {
        $scope.selectFile = function() {
            $("#file").click();
        }
        $scope.fileNameChanged = function(files) {
            if (files && files[0]) {
                var file = files[0];
                alert(file.name);
            }
        }
    });
</script>

<div ng-controller="form-cntlr">
    <form>
        <button ng-click="selectFile()">Upload Your File</button>
        <input type="file" style="display:none" id="file" name='file' ng-file-select="fileNameChanged($files)"/>
    </form>
</div>

Now, whenever a file is selected from the file input field, the fileNameChanged() function will be called with the selected file as a parameter. In the example above, we are simply displaying an alert with the file name, but you can perform any desired actions using this file object.

Engage with us! 🌟

We hope this guide helped you solve the issue of checking for changes in file input fields using AngularJS. If you have any questions or face any difficulties, feel free to ask in the comments section below. We love helping fellow developers!

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AngularJs: How to check for changes in file input fields?