See pub.dev example tab or github code for more details Specific uses # Building your own custom field Print(val) // Print the text value write into TextField No specific setup required: only install the dependency and use :) Basic use # final _formKey = GlobalKey() The rest of the attributes will be determined by the type of Widget being used. transform TextField value for numeric field from String to num This event function will fire immediately the the field value changesįunction that transforms field value before saving to form value. This will form the key in the form value Mapĭetermines whether the field widget will accept user input.ĭefines the border, labels, icons, and styles used to decorate the field.Ī FormFieldValidator that will check the validity of value in the FormField In order to create an input field in the form, along with the label, and any applicable validation, there are several attributes that are supported by all types of inputs namely: Attribute FormBuilderTextField - A Material Design text field input.FormBuilderSwitch - On/Off switch field.FormBuilderSlider - For selection of a numerical value on a slider.FormBuilderRangeSlider - Used to select a range from a range of values.FormBuilderRadioGroup - Used to select one value from a list of Radio Widgets.FormBuilderFilterChip - Creates a chip that acts like a checkbox.FormBuilderDropdown - Used to select one value from a list as a Dropdown.FormBuilderDateTimePicker - For Date, Time and DateTime input.FormBuilderDateRangePicker - For selection of a range of dates.FormBuilderChoiceChip - Creates a chip that acts like a radio button.FormBuilderCheckboxGroup - List of checkboxes for multiple selection.FormBuilderCheckbox - Single checkbox field.React to form fields changes and validations.Create a form with several type of inputs.Implement reset, clear or other button into field.This gives you a convenient way of adding common ready-made input fields instead of creating your own FormBuilderField from scratch. ++pre class=" language-dart">++code class="prism language-dart" style="display: block padding: 1rem word-wrap: normal max-height: 400px " spellcheck="false" contenteditable="">// main.This package helps in creation of data collection forms in Flutter by removing the boilerplate needed to build a form, validate fields, react to changes and collect final user input.Īlso included are common ready-made form input fields for FormBuilder. Let's start with an initial implementation of this form composed only of a TextFormField to retrieve the user's name. Here is what the final result looks like: Together we will build a sign up form for a fake dating app. I will now share with you how my team implemented its own FormField library. But if the doc is quite clear concerning the implementation of basic forms with TextFormField (check the official documentation or this good article from Coding With Joe), there isn't a lot of information about custom FormFields. This includes validation and submission both at form and field level or decoupling style with an InputDecorator. The Flutter framework provides a pretty good template to manage form in your project. In a recent Flutter project I had to implement some complex forms with custom input fields such as toggles or dates. You will learn one way to implement your own FormField library in Flutter, including multiple user input types such as Switch, ToggleButtons, Multiselection and Date. Let's see together how to use it on purpose. Google's Flutter framework provides an elegant way to deal with forms. Especially when it comes to including several types of user input. Nevertheless they can sometimes be tedious to manage. Dealing with forms is a recurring topic in web and mobile application development.
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