Render HTML string as real HTML in a React component

问题

Here\'s what I tried and how it goes wrong.

This works:

<div dangerouslySetInnerHTML={{ __html: \"<h1>Hi there!</h1>\" }} />

This doesn\'t:

<div dangerouslySetInnerHTML={{ __html: this.props.match.description }} />

---

The description property is just a normal string of HTML content. However it\'s rendered as a string, not as HTML for some reason.

Any suggestions?

回答1:

Check if the text you're trying to append to the node is no escaped like this:

var prop = {
    match: {
        description: '<h1>Hi there!</h1>'
    }
};

Instead of this:

var prop = {
    match: {
        description: '<h1>Hi there!</h1>'
    }
};

if is escaped you should convert it from your server-side.

The node is text because is escaped

The node is a dom node because isn't escaped

回答2:

Does this.props.match.description Is a string or an object? If it's a string, it should be converted to HTML just fine. Example:

class App extends React.Component {

constructor() {
    super();
    this.state = {
      description: '<h1 style="color:red;">something</h1>'
    }
  }

  render() {
    return (
      <div dangerouslySetInnerHTML={{ __html: this.state.description }} />
    );
  }
}

ReactDOM.render(<App />, document.getElementById('root'));

Result: http://codepen.io/ilanus/pen/QKgoLA?editors=1011

However if description: <h1 style="color:red;">something</h1> without the quotes '' you're going to get:

​Object {
$$typeof: [object Symbol] {},
  _owner: null,
  key: null,
  props: Object {
    children: "something",
    style: "color:red;"
  },
  ref: null,
  type: "h1"
}

If It's a string and you don't see any HTML markup the only problem i see is wrong markup..

UPDATE

If you are dealing with HTMLEntitles. You need to decode them before sending them to dangerouslySetInnerHTML that's why they called it dangerously :)

Working example:

class App extends React.Component {

  constructor() {
    super();
    this.state = {
      description: '<p><strong>Our Opportunity:</strong></p>'
    }
  }

   htmlDecode(input){
    var e = document.createElement('div');
    e.innerHTML = input;
    return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
  }

  render() {
    return (
      <div dangerouslySetInnerHTML={{ __html: this.htmlDecode(this.state.description) }} />
    );
  }
}

ReactDOM.render(<App />, document.getElementById('root'));

回答3:

I used 'react-html-parser'

yarn add react-html-parser

import ReactHtmlParser from 'react-html-parser'; 

<div> { ReactHtmlParser (html_string) } </div>

Source on npmjs.com

回答4:

If you have control over where the string containing html is coming from (ie. somewhere in your app), you can benefit from the new <Fragment> API, doing something like:

import React, {Fragment} from 'react'

const stringsSomeWithHtml = {
  testOne: (
    <Fragment>
      Some text <strong>wrapped with strong</strong>
    </Fragment>
  ),
  testTwo: `This is just a plain string, but it'll print fine too`,
}

...

render() {
  return <div>{stringsSomeWithHtml[prop.key]}</div>
}

回答5:

You just use dangerouslySetInnerHTML method of React

<div dangerouslySetInnerHTML={{ __html: htmlString }} />

Or you can implement more with this easy way: Render the HTML raw in React app

回答6:

dangerouslySetInnerHTML

dangerouslySetInnerHTML is React’s replacement for using innerHTML in the browser DOM. In general, setting HTML from code is risky because it’s easy to inadvertently expose your users to a cross-site scripting (XSS) attack. So, you can set HTML directly from React, but you have to type out dangerouslySetInnerHTML and pass an object with a __html key, to remind yourself that it’s dangerous. For example:

function createMarkup() {
  return {__html: 'First · Second'};
}

function MyComponent() {
  return <div dangerouslySetInnerHTML={createMarkup()} />;
}

回答7:

I could not get npm build to work with react-html-parser. However, in my case, I was able to successfully make use of https://reactjs.org/docs/fragments.html. I had a requirement to show few html unicode characters , but they should not be directly embedded in the JSX. Within the JSX, it had to be picked from the Component's state. Component code snippet is given below :

constructor() 
{
this.state = {
      rankMap : {"5" : <Fragment>&#9733; &#9733; &#9733; &#9733; &#9733;</Fragment> , 
                 "4" : <Fragment>&#9733; &#9733; &#9733; &#9733; &#9734;</Fragment>, 
                 "3" : <Fragment>&#9733; &#9733; &#9733; &#9734; &#9734;</Fragment> , 
                 "2" : <Fragment>&#9733; &#9733; &#9734; &#9734; &#9734;</Fragment>, 
                 "1" : <Fragment>&#9733; &#9734; &#9734; &#9734; &#9734;</Fragment>}
                };
}

render() 
{
       return (<div class="card-footer">
                    <small class="text-muted">{ this.state.rankMap["5"] }</small>
               </div>);
}

回答8:

If you have control to the {this.props.match.description} and if you are using JSX. I would recommend not to use "dangerouslySetInnerHTML".

// In JSX, you can define a html object rather than a string to contain raw HTML
let description = <h1>Hi there!</h1>;

// Here is how you print
return (
    {description}
);

来源：https://stackoverflow.com/questions/39758136/render-html-string-as-real-html-in-a-react-component