To fully customize form elements, buildTheme export accepts three parameters in the order in which they appear below: Let`s imagine a real-time situation where we need to add more fields to our form because our existing input fields are not enough. To solve the problem, we can create a button called “Add More” that creates a new pair of input fields when clicked. First, let`s create the button. Below is an example of a fully customized theme builder Let`s create a simple form first. The syntax is simple: if we now click on Delete, this form field will be deleted. Here, inputFields is an React state. We can now use this state to map our form fields. To use this state, we need to import the useState hook from the library. In this article, we`ll explain how to create dynamic forms in React, including conditional control of displayed fields and page navigation. For this demo, the form is not sent anywhere, but we prevent the default action with preventDefault.
The component gets the formData as a prop, so it`s up to the parent component to figure out how to get the data and pass it away, for this demo we hardcoded it into the codebase, but for Amy`s situation, it was retrieved as part of the Gatsby rendering process and included in the output package. An object used to display the button at the end of the form. Maintains configuration when the button appears and when the button behaves. See below for an example: buttons, the form lacks buttons to do something, whether it`s to submit the data or navigate between steps, let`s add them now: We`ll start by defining the data structure we`ll use for this example, but remember that the structure is controlled by the backend system, in which the forms are designed. So you need to optimize accordingly. Now let`s map our form fields based on their inputFields state. Suppose we enter the input field with index 0. Therefore, we specify the index in the data and the property name with event.target.name. And in this data index, we store the values of the input fields with event.target.value. The component takes a mandatory prop shape. Other accessories are optional.
The following table explains in more detail. This function includes a recursive function called findNextPage that is called when you click the button to start the discovery process. In this function, we go to the next sequential page and if it does not contain any conditional information, we return the index. If it has a condition field, similar to the conditional field test, we unzip it and compare the required value to the user value, and if they don`t match, we move on to the next (or previous) page of the stack. We repeat the process until we find a page that satisfies the condition or an unconditional page. Use the component reference to get form responses at any time In this tutorial, we will go over the slope so that you understand how to do it easily. Let`s start by creating a simple form using React JS. This makes it easy to render a label and input, update the HTML to the structure required for your design (or render fields from a form library such as Formik). The two accessories that are probably the most interesting are the value and the Changed field. The prop value is the current value of the controlled component, which comes from the Form component itself (we haven`t implemented it yet), and fieldChanged is used to update this master state list. Finally, we will add the “Delete” function to our dynamic form.
This becomes a very useful feature when it comes to changing or deleting the value of a form`s input field. By clicking on the Delete button we can delete the value of a row if we accidentally enter the wrong entry. Let`s add the delete function to our form. React JS allows developers to create forms that change based on user input. This can be extremely useful for creating custom forms specific to a particular use case. Also, React JS helps make forms organized and easy to navigate. So this is the basic logic behind dynamic form fields. I hope you enjoyed it.
If you like my article, follow me. Thank you very much. This can be a common requirement that we sometimes need to dynamically add or remove input fields in our forms and each input field must be provided with the appropriate value. Recently, I implemented this. We can do this in different ways. So here is my implementation. It is not uncommon to have a form that requires different information from the user when setting an option. This is where conditional fields come in, and to support them, we`re updating our data structure a bit: Note: Make sure you add and configure native vector icons in your project before using this package. Tip: When you use Object.assign in this manner, the objects are merged in the order listed, which means that the object values take precedence on the far right.
Therefore, if you navigate backwards in the form, your previous values still exist. Now you know how to create dynamic forms in React. Congratulations! As you already know, the form created above is static. A static form is isolated and of little use. Our goal is to create a dynamic form. Let`s make the above form dynamic using React state management. To make the form dynamic, I create a Reaction report, and that report contains an object that contains the age and salary properties. Let`s go. And with that, the basics of our dynamic form are finished, the time from shipping to production! Recently, my friend Amy Kapernick contacted me because she had a problem with React. She worked on a project that used a headless CMS to create and control multi-page forms and the fields they contain, including conditional fields/pages that show/hide based on the value of other fields.
The headless CMS then generated a JSON payload that was dragged into a Gatsby site and had to be rendered as a React form that a user could iterate. During the creation and rendering of the form, her problem was working with different parts of state management and making sure the right things were updated at the right time, and she needed a different pair of eyes on the problem. This effect has two dependencies, page and formData, so if one of the two changes changes (although it is really just a page that changes), it will be executed. When it runs, it retrieves the next page from the page state value and sets it as the current page using setCurrentPageData. Once this is done, we initialize all new fields in the value state using a callback to the setValues update function, which uses a reduce method to iterate over the fields and create a new object containing the newly initialized fields. Finally, the newly initialized field values are merged with all existing values to create the state of the new values. Let`s create a “Submit” button and function to display our data when submitting the form. But the fact is that if we try to type something into the input fields, we won`t be able to.
Because we have not defined the states in the formFields state. So, let`s do it. Having built dynamic form builders in the past, built systems powered by generic form builders, and generally having a lot to do with dynamic forms, I knew what kind of pain she was experiencing, so I was happy to help her. First of all, you may be wondering what a shape is! Let me put it this way: a form is an empty entity that can contain different values. It can be any type of value such as name, age, address, email, number, etc. Here we create a simple, static form that displays two lines. Using React JS to create dynamic forms is a great way to improve the user experience on your website. This makes the form more responsive and user-friendly, which can lead to more submissions. So, if you`re looking for a way to improve your forms, consider using React JS. It still has the upper hand while creating a dynamic form with React JS. userColors – The object of the colors to apply to the form element. See the file for the exact format.
We can easily delete our form data by dividing it by its index number. For example, we have a table with four pairs of data and we want to delete the first pair and save it to the console log. github.com/toystars/react-native-dynamic-form#readme In this article, we looked at how we can use React to create a dynamic form, starting with the state we need to store as React hooks, how we can handle user input with controlled components, and finally implement conditional logic to display fields and navigate between steps. As you can see in the example above, I created two different input fields that take the values “Name” and “Salary” as inputs. However, the form is static. He can only accept values, but can do nothing with those values. The form you create looks like this. A global design object can be passed to the dynamic form component applied to most form elements. Theming is still a work in progress and far from perfect, but it provides a basic way to customize form elements. Theme instructions can be found below: The MIT (MIT) license.
For more information, see LICENSE. Next, we want to get another feature of a dynamic form, which is the “Submit” button. Let`s imagine a situation where we want to provide our information and send or pass it on to the data subject/company.