问题
- The typical solution to the problem doesn't work in in React due to its dynamically generated component structure and event model, as opposed to traditional static HTML:
script:
<script>
function resizeIframe(obj) {
obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
}
</script>
html:
<iframe src="..." frameborder="0" scrolling="no" onload="resizeIframe(this)" />
There is a npm package
react-iframe, but it looks unfinished (accepts only propsurl,width,height):https://www.npmjs.com/package/react-iframe
The likely part of the solution is to listen to the
loadevent of theiframe, but in a way that is compatible with React.
Is there a way in React to set the height of an iframe to the height of its scrollable contents?
my code:
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import Iframe from 'react-iframe'
export default class FullheightIframe extends Component {
componentDidMount() {
console.log("IFRAME DID MOUNT");
}
renderReactFrame() {
return (
<Iframe url="http://www.example.com" width="100%" height="100%" onLoad={()=>{console.log("IFRAME ON LOAD")}}></Iframe>
);
}
renderHTMLFrame() {
return (
<iframe
onLoad={(loadEvent)=>{
// NOT WORKING var frameBody = ReactDOM.findDOMNode(this).contentDocument.body; // contentDocument undefined
// NOT WORKING obj.nativeEvent.contentWindow.document.body.scrollHeight // contentWindow undefined
}}
ref="iframe"
src="http://www.example.com"
width="100%"
height="100%"
scrolling="no"
frameBorder="0"
/>
);
}
render() {
return (
<div style={{maxWidth:640, width:'100%', height:'100%', overflow:'auto'}}>
{this.renderHTMLFrame()}
</div>
);
}
}
回答1:
What you want to do is in your componentDidMount, run the script to set the height. [If you are loading external content, you might want to add event listener on the IFrame to wait until the external content is loaded.]
componentDidMount() {
const obj = ReactDOM.findDOMNode(this);
obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
}
There is another, more "reacty" way of doing this - where you would store the height in state.
componentDidMount() {
const obj = ReactDOM.findDOMNode(this);
this.setState({iFrameHeight: obj.contentWindow.document.body.scrollHeight + 'px'});
}
and then in your render:
render() {
return (
<div style={{maxWidth:640, width:'100%', height:this.state.iFrameHeight, overflow:'auto'}}>
{this.renderHTMLFrame()}
</div>
);
}
回答2:
Here is the answer, but first two important things.
- Iframe has to be the root component in the
render()method - The height has to be captured from the
onLoadevent (once the iframe if fully loaded)
Here is the full code:
import React, { Component, PropTypes } from 'react'
import ReactDOM from 'react-dom'
export default class FullheightIframe extends Component {
constructor() {
super();
this.state = {
iFrameHeight: '0px'
}
}
render() {
return (
<iframe
style={{maxWidth:640, width:'100%', height:this.state.iFrameHeight, overflow:'visible'}}
onLoad={() => {
const obj = ReactDOM.findDOMNode(this);
this.setState({
"iFrameHeight": obj.contentWindow.document.body.scrollHeight + 'px'
});
}}
ref="iframe"
src="http://www.example.com"
width="100%"
height={this.state.iFrameHeight}
scrolling="no"
frameBorder="0"
/>
);
}
}
回答3:
A couple of things to note here:
- You can use refs to get a reference to the iframe instead of having to search for it
- Use the onLoad() handler from the iframe to ensure that the content has loaded before you try to resize it - if you try to use React's lifecycle methods like
componentDidMount()you run the risk of the content not being present yet. - You will likely also want a resize handler to ensure the iframe gets resized as needed - just be sure to clean it up when the component unmounts.
- You have to be careful of how different browsers report the height. Go for the largest you can find.
- You may have issues if the iframe content is in a different domain than your code. There are solutions out there such as react-iframe-resizer-super that try to solve this problem in a cross-domain compatible way.
class WrappedFrame extends React.Component {
state = { contentHeight: 100 };
handleResize = () => {
const { body, documentElement } = this.container.contentWindow.document;
const contentHeight = Math.max(
body.clientHeight,
body.offsetHeight,
body.scrollHeight,
documentElement.clientHeight,
documentElement.offsetHeight,
documentElement.scrollHeight
);
if (contentHeight !== this.state.contentHeight) this.setState({ contentHeight });
};
onLoad = () => {
this.container.contentWindow.addEventListener('resize', this.handleResize);
this.handleResize();
}
componentWillUnmount() {
this.container.contentWindow.removeEventListener('resize', this.handleResize);
}
render() {
const { contentHeight } = this.state;
return (
<iframe
frameBorder="0"
onLoad={this.onLoad}
ref={(container) => { this.container = container; }}
scrolling="no"
src="your.source"
style={{ width: '100%', height: `${contentHeight}px` }}
title="Some Content"
/>
);
}
}In this example we're storing the determined content height in the component's state and using that state to set the height of the rendered iframe. Also, by putting the onLoad() handler definition in the component, you save a tiny bit of performance in render() by not creating a new handler function on every re-render.
回答4:
None of the answers proposed so far worked for me. The hackish approach of doing a short setTimeout from within onLoad kind-of seems to do the job, at least in my case.
class SmartIFrame extends React.Component {
render() {
return <iframe srcDoc={this.props.srcDoc}
scrolling="no"
frameBorder={0}
width="100%"
onLoad = {e => setTimeout(() => {
const obj = ReactDOM.findDOMNode(this);
obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
}, 50)}/>
}
}
回答5:
This npm package will do what you what, it offers a range of different ways to calculate the height of the content in the iframe
https://www.npmjs.com/package/iframe-resizer-react
With this use case it can be configured as follows
<IframeResizer
heightCalculationMethod="bodyScroll"
src="http://anotherdomain.com/iframe.html"
/>
来源：https://stackoverflow.com/questions/42042901/setting-iframe-height-to-scrollheight-in-reactjs