我想要做的是,当页面被加载时,它应该从parse.com数据库中提取所有数据并显示在页面上,并且我希望在完成查找请求之后呈现我的组件。
下面你可以看到我的代码
var Ap = React.createClass({
render: function(){
Parse.initialize("mSWrLtmIHQdh8CNGk14fLbnK4gaVDbgvjw1zTeCT", "qKDkELvVpvgkuDDZzGK2pdP5o69LBDjWaRI2XfUb");
var GameScore = Parse.Object.ext
我正在写一个react crud应用程序,我的crud工作得很好,但它有一个控制台错误,下面是:
Warning: A component is changing a controlled input of type text to be uncontrolled. Input elements should not switch from controlled to uncontrolled (or vice versa). Decide between using a controlled or uncontrolled input element for the lifetime of
尽管有许多问题的主题是相同的,但我无法回答我的问题。
问题
I have a select dropdown. On click of which, I call an Api which fetches some key values. I consider this set of key value input fields as a component. So each and every time onChange of my select drop-down, I have used lifecycle methods to handle API Calls. Also, I
我目前正在处理一个中等大小的reactJS应用程序,并在单击组件上的一个按钮后获得以下错误消息:
Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op.
如何更容易地调试?为什么reactJS不给出违反此规则的特定组件名称?
你会怎么做?
我在React组件中有一个属性name。我正在尝试使用setState来修改这个属性。但是,在setState中为该属性赋一个新值没有任何效果。请在下面找到我的示例代码。
export const Test = ({
name,
changeState = function (newName) {
this.setState({name: newName}, () => console.log('Name after setState # ' + name)); //prints old value
console.log(name); // Do
我知道,当为尚未挂载的组件设置状态时,会引发错误。这解释了使用setState函数进行显式和直接设置状态时所产生的错误。
import React, {Component} from 'react';
class SearchBar extends Component {
constructor(props) {
super(props);
this.state = {term: ''}; // -> seems to be the agreed means to set initial state
// this.setState({t