Flutter package that facilitates image upload and management by incorporating an image field into a form.

03 October 2023
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flutter image field

Flutter package enables users to upload and manage images by adding image field to a form, in addition to strong functionality to adapt images before uploading to the server and alter the widget before rendering it and a lot of other features.

Screenshot

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Features

Best structure supports the upload to a server
localizations, override all texts
Support multiple upload
You can specify the limited number of image uploads
Upload progress

Usage

1.Install Package With Dart:

$ dart pub add image_field

With Flutter:

$ flutter pub add image_field

This will add a line like this to you package’s pubspec.yaml (and run an implicit dart pub get):

dependencies:
  image_field: ^0.0.2

2.Implementation You can use ImageField() for upload to a server by following the example below:

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:image_field/image_field.dart';
import 'package:image_field/linear_progress_Indicator.dart';
import 'package:image_picker/image_picker.dart';

typedef Progress = Function(double percent);

class UploadRemoteImageForm extends StatefulWidget {
  const UploadRemoteImageForm({super.key, required this.title});
  final String title;
  @override
  State<UploadRemoteImageForm> createState() => _UploadRemoteImageFormState();
}

class _UploadRemoteImageFormState extends State<UploadRemoteImageForm> {
  // not a GlobalKey<MyCustomFormState>.
  final _formKey = GlobalKey<FormState>();

  dynamic remoteFiles;

 
  Future<dynamic> uploadToServer(XFile? file,
      {Progress? uploadProgress}) async {
    //implement your code using Rest API or other technology
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Form(
          key: _formKey,
          child:  Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
        
                //Remote Image upload
                ImageField(
                    texts: const {
                      'fieldFormText': 'Upload to server',
                      'titleText': 'Upload to server'
                    },
                    defaultFiles: remoteFiles != null
                        ? remoteFiles!.map((image) {
                            return ImageAndCaptionModel(
                                file: image, caption: image.alt.toString());
                          }).toList()
                        : [],
                    remoteImage: true,
                    onUpload: (dynamic pickedFile,
                        ControllerLinearProgressIndicator?
                            controllerLinearProgressIndicator) async {
                      dynamic fileUploaded = await uploadToServer(
                        pickedFile,
                        uploadProgress: (percent) {
                          var uploadProgressPercentage = percent / 100;
                          controllerLinearProgressIndicator!
                              .updateProgress(uploadProgressPercentage);
                        },
                      );
                      return fileUploaded;
                    },
                    onSave: (List<ImageAndCaptionModel>? imageAndCaptionList) {
                      remoteFiles = imageAndCaptionList;
                    }),
      
              ],
            ),
     
        ));
  }
}

Simple locally upload by adding ImageField() to a form like the following example:

import 'package:flutter/material.dart';
import 'package:image_field/image_field.dart';
import 'package:image_field/linear_progress_Indicator.dart';


class UploadLocalImageForm extends StatefulWidget {
  const UploadLocalImageForm({super.key, required this.title});

  final String title;

  @override
  State<UploadLocalImageForm> createState() => _UploadLocalImageFormState();
}

class _UploadLocalImageFormState extends State<UploadLocalImageForm> {
  final _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Form(
          key: _formKey,
          child:  Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                
                //...
                // textfield
                // checkbox
                // datefield
                // ....

              //Local image upload
                ImageField(onSave:(List<ImageAndCaptionModel>? imageAndCaptionList) {
                    //you can save imageAndCaptionList using local storage
                    //or in a simple variable
                },),
 
                 //....
                 //Submit button
                 //....
              ],
            ),
          ),
        );
  }
}

Main Parameters

ParameterTypeDescriptiondefaultFilesListUsed to add default images on loadremoteImageWidgetUsed for remote upload image, if True should implement onUpload() functiontextsMap<String, String>key/value variable used for localizations or to override the defaults texts used by the Imagefield.multipleUploadboolEnable user to pick multiple files.cardinalityintMaximum number of files that can be uploaded.

Main Functions

FunctionParameterDescriptiononUploaddynamic Function(dynamic, ControllerLinearProgressIndicator?)?This function has [dataSource] image that uploaded by a user to send them to the server and [controllerLinearProgressIndicator] used as a reference variable to indicate the uploading progress to the server and return the result to store it in the [fileList] that used in the field.onSavevoid Function(List?)?Used to update the form with the uploaded files, it called when back from the listviewalterFieldFormWidget Function(List?, Widget)?It’s a hook function used to alter the widget of the field(Thumbnail List) in the form before rendering it