react-jsonschema-form¶
A simple React component capable of building HTML forms out of a JSON schema and using Bootstrap semantics by default.
A live playground is hosted on gh-pages.
Testing powered by BrowserStack
Philosophy¶
react-jsonschema-form is meant to automatically generate a React form based on a JSON Schema. It is a major component in the kinto-admin project. If you want to generate a form for any data, sight unseen, simply given a JSON schema, react-jsonschema-form may be for you. If you have a priori knowledge of your data and want a toolkit for generating forms for it, you might look elsewhere.
react-jsonschema-form validates that the data conforms to the given schema, but doesn't prevent the user from inputing data that doesn't fit (for example, stripping non-numbers from a number field, or adding values to an array that is already "full").
Installation¶
Requires React 15.0.0+.
Note: The
master
branch of the repository reflects ongoing development. Releases are published as tags. You should never blindly install frommaster
, but rather check what the available stable releases are.
As a npm-based project dependency¶
$ npm install react-jsonschema-form --save
Note: While the library renders Bootstrap HTML semantics, you have to build and load the Bootstrap styles on your own.
As a script served from a CDN¶
<script src="https://unpkg.com/react-jsonschema-form/dist/react-jsonschema-form.js"></script>
Source maps are available at this url.
Note: The CDN version does not embed
react
orreact-dom
.
You'll also need to alias the default export property to use the Form component:
const Form = JSONSchemaForm.default;
// or
const {default: Form} = JSONSchemaForm;
Usage¶
import React, { Component } from "react";
import { render } from "react-dom";
import Form from "react-jsonschema-form";
const schema = {
title: "Todo",
type: "object",
required: ["title"],
properties: {
title: {type: "string", title: "Title", default: "A new task"},
done: {type: "boolean", title: "Done?", default: false}
}
};
const log = (type) => console.log.bind(console, type);
render((
<Form schema={schema}
onChange={log("changed")}
onSubmit={log("submitted")}
onError={log("errors")} />
), document.getElementById("app"));
This will generate a form like this (assuming you loaded the standard Bootstrap stylesheet):
Form initialization¶
Often you'll want to prefill a form with existing data; this is done by passing a formData
prop object matching the schema:
const formData = {
title: "First task",
done: true
};
render((
<Form schema={schema}
formData={formData} />
), document.getElementById("app"));
Note: If your form has a single field, pass a single value to
formData
. ex:formData='Charlie'
WARNING: If you have situations where your parent component can re-render, make sure you listen to the
onChange
event and update the data you pass to theformData
attribute.
Form event handlers¶
Form submission¶
You can pass a function as the onSubmit
prop of your Form
component to listen to when the form is submitted and its data are valid. It will be passed a result object having a formData
attribute, which is the valid form data you're usually after. The original event will also be passed as a second parameter:
const onSubmit = ({formData}, e) => console.log("Data submitted: ", formData);
render((
<Form schema={schema}
onSubmit={onSubmit} />
), document.getElementById("app"));
Note: If there are fields in the
formData
that are not represented in the schema, they will be retained by default. If you would like to remove those extra values on form submission, then set theomitExtraData
prop totrue
. Set theliveOmit
prop to true in order to remove extra data upon form data change.
Form error event handler¶
To react when submitted form data are invalid, pass an onError
handler. It will be passed the list of encountered errors:
const onError = (errors) => console.log("I have", errors.length, "errors to fix");
render((
<Form schema={schema}
onError={onError} />
), document.getElementById("app"));
Form data changes¶
If you plan on being notified every time the form data are updated, you can pass an onChange
handler, which will receive the same args as onSubmit
any time a value is updated in the form.
Note: If
omitExtraData
andliveOmit
are both set to true, then extra form data values that are not in any form field will be removed wheneveronChange
is called.
Form field blur events¶
Sometimes you may want to trigger events or modify external state when a field has been touched, so you can pass an onBlur
handler, which will receive the id of the input that was blurred and the field value.
Form field focus events¶
Sometimes you may want to trigger events or modify external state when a field has been focused, so you can pass an onFocus
handler, which will receive the id of the input that is focused and the field value.
Submit form programmatically¶
You can use the reference to get your Form
component and call the submit
method to submit the form programmatically without a submit button.
This method will dispatch the submit
event of the form, and the function, that is passed to onSubmit
props, will be called.
const onSubmit = ({formData}) => console.log("Data submitted: ", formData);
let yourForm;
render((
<Form schema={schema}
onSubmit={onSubmit} ref={(form) => {yourForm = form;}}/>
), document.getElementById("app"));
yourForm.submit();
Styling your forms¶
This library renders form fields and widgets leveraging the Bootstrap semantics. That means your forms will be beautiful by default if you're loading its stylesheet in your page.
You're not necessarily forced to use Bootstrap; while it uses its semantics, it also provides a bunch of other class names so you can bring new styles or override default ones quite easily in your own personalized stylesheet. That's just HTML after allĀ :)
If you're okay with using styles from the Bootstrap ecosystem though, then the good news is that you have access to many themes for it, which are compatible with our generated forms!
Here are some examples from the playground, using some of the Bootswatch free themes:
Last, if you really really want to override the semantics generated by the lib, you can always create and use your own custom widget, field and/or schema field components.
JSON Schema supporting status¶
This component follows JSON Schema specs. Due to the limitation of form widgets, there are some exceptions as follows:
-
additionalItems
keyword for arraysThis keyword works when
items
is an array.additionalItems: true
is not supported because there's no widget to represent an item of any type. In this case it will be treated as no additional items allowed.additionalItems
being a valid schema is supported. -
anyOf
,allOf
, andoneOf
, or multipletypes
(i.e."type": ["string", "array"]
)The
anyOf
andoneOf
keywords are supported, however, properties declared inside theanyOf/oneOf
should not overlap with properties "outside" of theanyOf/oneOf
.You can also use
oneOf
with schema dependencies to dynamically add schema properties based on input data. -
"additionalProperties":false
produces incorrect schemas when used with schema dependencies. This library does not remove extra properties, which causes validation to fail. It is recommended to avoid setting"additionalProperties":false
when you use schema dependencies. See #848 #902 #992
Tips and tricks¶
- Custom field template: https://jsfiddle.net/hdp1kgn6/1/
- Multi-step wizard: https://jsfiddle.net/sn4bnw9h/1/
- Using classNames with uiSchema: https://jsfiddle.net/gfwp25we/1/
- Conditional fields: https://jsfiddle.net/69z2wepo/88541/
- Advanced conditional fields: https://jsfiddle.net/cowbellerina/zbfh96b1/
- Use radio list for enums: https://jsfiddle.net/f2y3fq7L/2/
- Reading file input data: https://jsfiddle.net/f9vcb6pL/1/
- Custom errors messages with transformErrors: https://jsfiddle.net/revolunet/5r3swnr4/
- 2 columns form with CSS and FieldTemplate: https://jsfiddle.net/n1k0/bw0ffnz4/1/
- Validate and submit form from external control: https://jsfiddle.net/spacebaboon/g5a1re63/
- Custom component for Help text with
ui:help
: https://codesandbox.io/s/14pqx97xl7/ - Collapsing / Showing and Hiding individual fields: https://codesandbox.io/s/examplereactjsonschemaformcollapsefieldtemplate-t41dn
Contributing¶
Coding style¶
All the JavaScript code in this project conforms to the prettier coding style. A command is provided to ensure your code is always formatted accordingly:
$ npm run cs-format
The cs-check
command ensures all files conform to that style:
$ npm run cs-check
Development server¶
$ npm start
A live development server showcasing components with hot reload enabled is available at localhost:8080.
If you want the development server to listen on another host or port, you can use the RJSF_DEV_SERVER env variable:
$ RJSF_DEV_SERVER=0.0.0.0:8000 npm start
Build documentation¶
We use mkdocs to build our documentation. To run documentation locally, run:
$ pip install mkdocs==1.0.4
$ mkdocs serve
Documentation will be served by localhost:8000.
Tests¶
$ npm test
TDD¶
$ npm run tdd
Code coverage¶
Code coverage reports are generated using nyc each time the npm test-coverage
script is run.
The full report can be seen by opening ./coverage/lcov-report/index.html
.
Releasing¶
$ edit package.json # update version number
$ git commit -m "Bump version $VERSION"
$ git tag v$VERSION
$ npm run dist
$ npm publish
$ git push --tags origin master
FAQ¶
Q: Does rjsf support oneOf
, anyOf
, multiple types in an array, etc.?¶
A: The anyOf
and oneOf
keywords are supported, however, properties declared inside the anyOf/oneOf
should not overlap with properties "outside" of the anyOf/oneOf
.
There is also special cased where you can use oneOf
in schema dependencies, If you'd like to help improve support for these keywords, see the following issues for inspiration #329 or #417. See also: #52, #151, #171, #200, #282, #302, #330, #430, #522, #538, #551, #552, or #648.
In addition, "nullable" types are supported in a narrow sense: If a property declares a type of ["<some-type>", "null"]
, then "some-type"
will be passed through as the type used to determine which widget to use for rendering the field. However, the actual rendering and handling of the field is unchanged; you are free to handle this using an approach ('ui:emptyValue': null
, for example) best-suited to your use case.
Q: Will react-jsonschema-form support Material, Ant-Design, Foundation, or [some other specific widget library or frontend style]?¶
A: Probably not. We use Bootstrap v3 and it works fine for our needs. We would like for react-jsonschema-form to support other frameworks, we just don't want to support them ourselves. Ideally, these frontend styles could be added to react-jsonschema-form with a third-party library. If there is a technical limitation preventing this, please consider opening a PR. See also: #91, #99, #125, #237, #287, #299, #440, #461, #546, #555, #626, and #623.
Q: Is there a way to "collapse" fields, for instance to show/hide individual fields?¶
A: There's no specific built-in way to do this, but you can write your own FieldTemplate that supports hiding/showing fields according to user input. See the "tips and tricks" section above for one example implementation. See also: #268, #304, #598, #920.
License¶
Apache 2