Reputation: 4842
I am trying to implement a List view in React.
What I am trying to achieve is that to store the list headers informations and register the components and register the scroll event.
every time when user scroll the window, I'd like to take out the stored div and re-calculate the offsetTop
data.
The problem now is that, I found the console just print out the initial value (the value is fixed and never changed) offsetTop
data never change in onscroll
function.
Anyone suggest how to get latest offsetTop
from the _instances
object?
import React, { Component } from 'react';
import ListHeader from './lib/ListHeader';
import ListItems from './lib/ListItems';
const styles = {
'height': '400px',
'overflowY': 'auto',
'outline': '1px dashed red',
'width': '40%'
};
class HeaderPosInfo {
constructor(headerObj, originalPosition, originalHeight) {
this.headerObj = headerObj;
this.originalPosition = originalPosition;
this.originalHeight = originalHeight;
}
}
export default class ReactListView extends Component {
static defaultProps = {
events: ['scroll', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll', 'resize', 'touchmove', 'touchend'],
_instances:[],
_positionMap: new Set(),
_topPos:'',
_topWrapper:''
}
static propTypes = {
data: React.PropTypes.array.isRequired,
headerAttName: React.PropTypes.string.isRequired,
itemsAttName: React.PropTypes.string.isRequired,
events: React.PropTypes.array,
_instances: React.PropTypes.array,
_positionMap: React.PropTypes.object,
_topPos: React.PropTypes.string,
_topWrapper: React.PropTypes.object
};
state = {
events: this.props.events,
_instances: this.props._instances,
_positionMap: this.props._positionMap,
_topPos: this.props._topPos
}
componentDidMount() {
this.initStickyHeaders();
}
componentWillUnmount() {
}
componentDidUpdate() {
}
refsToArray(ctx, prefix){
let results = [];
for (let i=0;;i++){
let ref = ctx.refs[prefix + '-' + String(i)];
if (ref) results.push(ref);
else return results;
}
}
initHeaderPositions() {
// Retrieve all instance of headers and store position info
this.props._instances.forEach((k)=>{
this.props._positionMap.add(new HeaderPosInfo(
k,
k.refs.header.getDOMNode().offsetTop,
k.refs.header.getDOMNode().offsetHeight
));
});
let it = this.props._positionMap.values();
let first = it.next();
this.props._topPos = first.value.originalPosition;
this.props._topWrapper = first.value.headerObj;
}
initStickyHeaders () {
this.props._instances = this.refsToArray(this, 'ListHeader');
this.initHeaderPositions();
// Register events listeners with the listview div
this.props.events.forEach(type => {
if (window.addEventListener) {
React.findDOMNode(this.refs.listview).addEventListener(type, this.onScroll.bind(this), false);
} else {
React.findDOMNode(this.refs.listview).attachEvent('on' + type, this.onScroll.bind(this), false);
}
});
}
onScroll() {
// update current header positions and apply fixed positions to the top one
console.log(1);
let offsetTop = React.findDOMNode(this.props._instances[0].refs.header).offsetTop;
}
render() {
const { data, headerAttName, itemsAttName } = this.props;
let _refi = 0;
let makeRef = () => {
return 'ListHeader-' + (_refi++);
};
return (
<div ref="listview" style={styles}>
{
Object.keys(data).map(k => {
const header = data[k][headerAttName];
const items = data[k][itemsAttName];
return (
<ul key={k}>
<ListHeader ref={makeRef()} header={header} />
<ListItems items={items} />
</ul>
);
})
}
</div>
);
}
}
The whole source code is on Github, you can clone and compile it from here:
Upvotes: 100
Views: 272400
Reputation: 71
Checking if height Property Is Not Set on Parent:
Checking if a Parent Element Is a Flexbox
If sticky element's parent is a flexbox, there are two scenarios to check for:
The sticky element has align-self: auto set (which is the default); The sticky element has align-self: stretch set. If the Sticky Element Has align-self: auto Set: In this case the value of align-self would compute to the parent's align-items value. So,
if the parent has align-items: normal (which is the default) or align-items: stretch set, then it means the height of the sticky element would stretch to fill the entire available space. This would leave no room for the sticky element to scroll within the parent.
If the Sticky Element Has align-self: stretch Set:
In this case, the sticky element would stretch to the height of the parent, and would not have any area to scroll within.
How to Make Sticky Element Scrollable Within a Flexbox: You could simply set the value of the align-self property to align-self: flex-start. This would put the sticky element at the start and won't stretch it.enter link description here
Upvotes: 2
Reputation: 441
onScroll has a events whict contains all the native and child elements inside this div so u can use it like this shown below and get the targetted element offsetTop.
const getoffSet = e => {
console.log(e, e.natiiveEvent.target.childNodes[0].offsetTop)
}
return (
<div onScroll={(e) => getoffSet(e)} ref={listview} style={styles}>
</div>
)
Upvotes: 1
Reputation: 1838
I do realize that the author asks question in relation to a class-based component, however I think it's worth mentioning that as of React 16.8.0 (February 6, 2019) you can take advantage of hooks in function-based components.
Example code:
import { useRef } from 'react'
function Component() {
const inputRef = useRef()
return (
<input ref={inputRef} />
<div
onScroll={() => {
const { offsetTop } = inputRef.current
...
}}
>
)
}
Upvotes: 76
Reputation: 621
A quicker way if you are using React 16.3 and above is by creating a ref in the constructor, then attaching it to the component you wish to use with as shown below.
...
constructor(props){
...
//create a ref
this.someRefName = React.createRef();
}
onScroll(){
let offsetTop = this.someRefName.current.offsetTop;
}
render(){
...
<Component ref={this.someRefName} />
}
Upvotes: 17
Reputation: 1521
import ReactDOM from 'react-dom';
//...
componentDidMount() {
var n = ReactDOM.findDOMNode(this);
console.log(n.offsetTop);
}
You can just grab the offsetTop from the Node.
Upvotes: 11
Reputation: 1835
A better solution with ref to avoid findDOMNode that is discouraged.
...
onScroll() {
let offsetTop = this.instance.getBoundingClientRect().top;
}
...
render() {
...
<Component ref={(el) => this.instance = el } />
...
Upvotes: 11
Reputation: 1624
Eugene's answer uses the correct function to get the data, but for posterity I'd like to spell out exactly how to use it in React v0.14+ (according to this answer):
import ReactDOM from 'react-dom';
//...
componentDidMount() {
var rect = ReactDOM.findDOMNode(this)
.getBoundingClientRect()
}
Is working for me perfectly, and I'm using the data to scroll to the top of the new component that just mounted.
Upvotes: 32
Reputation: 4129
You may be encouraged to use the Element.getBoundingClientRect() method to get the top offset of your element. This method provides the full offset values (left, top, right, bottom, width, height) of your element in the viewport.
Check the John Resig's post describing how helpful this method is.
Upvotes: 121