Simple and lightweight (< 2kB) HTML string to react element conversion library
$ yarn add htmr
# or
$ npm install htmr --saveUse the default export, and pass HTML string.
import React from 'react';
import htmr from 'htmr';
function HTMLComponent() {
return htmr('<p>No more dangerouslySetInnerHTML</p>');
}The API also accepts second argument options containing few optional fields. Below are their default values:
const options = {
transform: {},
preserveAttributes: [],
dangerouslySetChildren: ['style'],
};
htmr(html, options);transform accepts key value pairs, that will be used to transforms node (key) to custom component (value). You can use it to render specific tag name with custom component. For example: component with predefined styles like styled-components.
import React from 'react';
import htmr from 'htmr';
import styled from 'styled-components';
const Paragraph = styled.p`
font-family: Helvetica, Arial, sans-serif;
line-height: 1.5;
`;
const transform = {
p: Paragraph,
// you can also pass string for native DOM node
a: 'span',
};
function TransformedHTMLComponent() {
// will return <Paragraph><span>{'Custom component'}</span></Paragraph>
return htmr('<p><a>Custom component</a></p>', { transform });
}You can also provide default transform using underscore _ as property name.
This can be useful if you want to do string preprocessing (like removing all whitespace), or rendering HTML as native view in react-native:
import React from 'react';
import { Text, View } from 'react-native';
const transform = {
div: View,
_: (node, props, children) => {
// react-native can't render string without <Text> component
// we can test text node by checking component props, text node won't have them
if (typeof props === 'undefined') {
// use `key` because it's possible that <Text> is rendered
// inside array as sibling
return <Text key={node}>{node}</Text>;
}
// render unknown tag using <View>
// ideally you also filter valid props to <View />
return <View {...props}>{children}</View>;
},
};
function NativeHTMLRenderer(props) {
return htmr(props.html, { transform });
}By default htmr will convert HTML attributes to camelCase because that's what React uses. You can override this behavior by passing preserveAttributes options. Specify array of string / regular expression to test which attributes you want to preserve.
For example you want to make sure ng-if, v-if and v-for to be rendered as is
htmr(html, { preserveAttributes: ['ng-if', new RegExp('v-')] });By default htmr will only render children of style tag inside dangerouslySetInnerHTML due to security reason. You can override this behavior by passing array of HTML tags if you want the children of the tag to be rendered dangerously.
htmr(html, { dangerouslySetChildren: ['code', 'style'] });Note that if you still want style tag to be rendered using dangerouslySetInnerHTML, you still need to include it in the array.
You can also convert HTML string which contains multiple elements. This returns an array, so make sure to wrap the output inside other component such as div, or use React 16.
import React from 'react';
import htmr from 'htmr';
const html = `
<h1>This string</h1>
<p>Contains multiple html tags</p>
<p>as sibling</p>
`;
function ComponentWithSibling() {
// if using react 16, simply use the return value because
// v16 can render array
return htmr(html);
// if using react 15 and below, wrap in another component
return <div>{htmr(html)}</div>;
}This library was initially built to provides easy component mapping between HTML string and React component. It's mainly used to render custom component from HTML string returned from an API. This library prioritize file size and simple API over full HTML conversion coverage and other features like JSX parsing or flexible node traversal.
That's why I've decided to not implement some features (see Trade Off section below). If you feel like you need more features that's not possible using this library, you can check out some related projects below.
- Inline event attributes (
onclick=""etc) are not supported due to unnecessary complexity - htmr use native browser HTML parser when run in browser instead of using custom parser. Due to how browser HTML parser works, you can get weird result if you supply "invalid" html, for example
divinsidepelement like<p><div>text</div></p> - Script tag is not rendered using
dangerouslySetInnerHTMLby default due to security. You can opt in by usingdangerouslySetChildren - Style tag renders it children using
dangerouslySetInnerHTMLby default. You can also reverse this behavior using same method.
HTML to react element:
HTML (page) to react component (file/string):
MIT
![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
![greenkeeper[bot] avatar](https://avatars.githubusercontent.com/in/505?v=4 "greenkeeper[bot]")
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent