refs

React array of refs

由 你离开我真会死。 提交于 2020-05-11 04:49:46
问题 i have read in a post on Stackoverflow question about refs that we can use something like the following code to assign an array of refs to different inputs like this: <Progressbar completed={25} id="Progress1" ref={(input) => {this.Progress[0] = input }}/> <Progressbar completed={50} id="Progress2" ref={(input) => {this.Progress[1] = input }}/> <Progressbar completed={75} id="Progress3" ref={(input) => {this.Progress[2] = input }}/> but when i try it, it returns this error: Uncaught TypeError

React array of refs

由 自古美人都是妖i 提交于 2020-05-11 04:47:17
问题 i have read in a post on Stackoverflow question about refs that we can use something like the following code to assign an array of refs to different inputs like this: <Progressbar completed={25} id="Progress1" ref={(input) => {this.Progress[0] = input }}/> <Progressbar completed={50} id="Progress2" ref={(input) => {this.Progress[1] = input }}/> <Progressbar completed={75} id="Progress3" ref={(input) => {this.Progress[2] = input }}/> but when i try it, it returns this error: Uncaught TypeError

How to access to actual Component when using ref and having ProxyComponent

由 南笙酒味 提交于 2020-01-04 05:19:29
问题 We have a ref to a react component and want to call a method of this component. When using the ref it is a "ProxyComponent" object. How can I use it as my actual component or what to do to be able to do this. I saw, that there is the attribute "renderedElement" and inside the attribute "type" which is the correct type of my actual component. But I didnt find a way to use it like this/to call my components methods. 来源： https://stackoverflow.com/questions/38077572/how-to-access-to-actual

what is the alternative for ReactDOM.findDOMNode() as it is deprecated now?

由 ☆樱花仙子☆ 提交于 2019-12-21 12:34:07
问题 I have an old code which is using findDOMNode(). here is my code, where someComponent1 and Expand is already imported Here I have some doubt the code I have written with findDOMNode() is working perfectly fine but as it is deprecated now I want to remove it. I have gone through many document and found to use portals or refs instead of this. I have a understanding that if I am using ref then the variable get bind to that also has an access to the DOM element, but I guess I am wrong as it is

In React do ref's reference the virtual DOM, or the actual DOM?

由 蹲街弑〆低调 提交于 2019-12-20 04:38:32
问题 I'm assuming the virtual DOM, and that React takes care of it with diff'ing. But I had a recruiter say that ref's affect the actual DOM, I can't see how this can be. I assume that they were just mistaken. 回答1: Refs should reference the actual DOM. One usage of Refs is integrating with third-party DOM libraries, so you can directly modify the DOM using Refs. If Refs reference the virtual DOM, I don't think the demand can be meet. You modify a virtual DOM, but you can't make sure the

Does ReFS handle small files and large deletes faster than NTFS?

由 血红的双手。 提交于 2019-12-14 02:49:10
问题 I work with developer tools like git and npm/yarn that often generate lots of small files. I know from NTFS performance and large volumes of files and directories (and from experience) that NTFS doesn't handle these as fast as most Unix filesystems. However I also know never versions of Windows support ReFS, a new Microsoft filesystem. My question is: does ReFS handle small files and large deletes faster than NTFS? 来源： https://stackoverflow.com/questions/50600934/does-refs-handle-small-files

Focus on next Input field on Enter in Redux Form

由 白昼怎懂夜的黑 提交于 2019-12-11 17:15:19
问题 I want to define a HOC(higher order Component) which will be responsible for handling the functionality. import React, { Component } from 'react'; const NextFieldOnEnter = WrappedContainer => class extends Component { componentDidMount() { console.log('hoc', this.refs); //move to next input field } render() { return <WrappedContainer {...this.props} />; } }; export default NextFieldOnEnter; It says this.refs is deprecated . So how can I achieve tab like behavior when enter key is pressed. My

Should multiple Clojure refs be read in a transaction for consistency?

由 感情迁移 提交于 2019-12-10 14:12:10
问题 This is a theoretical question motivated by my desire to understand Clojure's concurrency better. Let's say I'm writing boids. Assume each boid is a separate green thread mutating positions in a vector or refs representing a world grid. Think Hickey's ants colony. Now, documentation at Clojure.org states "All reads of Refs will see a consistent snapshot of the ‘Ref world’ as of the starting point of the transaction (its ‘read point’)." Does this mean I can only get a consistent snapshot of my

React - How do I access a function in another component?

由 蹲街弑〆低调 提交于 2019-12-08 12:45:49
问题 My structure is as such: <ParentComponent /> <Child 1 /> <Child 2 /> I have a function in <Child 1 /> . Since <Child 1 /> controls the grid-layout, and <Child 2 /> is a Navbar with buttons, I want to have a button in <Child 2 /> which will reset some parameters in <Child 1 /> . How do I achieve this? As far as I can see, refs will only be able to go one "step" up the tree, not down. There isn't any obvious way this function can be invoked from the parent component. Is there any way here? All

In React do ref's reference the virtual DOM, or the actual DOM?

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-02 06:58:17
I'm assuming the virtual DOM, and that React takes care of it with diff'ing. But I had a recruiter say that ref's affect the actual DOM, I can't see how this can be. I assume that they were just mistaken. Refs should reference the actual DOM. One usage of Refs is integrating with third-party DOM libraries, so you can directly modify the DOM using Refs. If Refs reference the virtual DOM, I don't think the demand can be meet. You modify a virtual DOM, but you can't make sure the modification would be synchronized to the actual DOM. Besides, if you want to modify actual DOM when using react, you
订阅 refs