REACT JS：映射在JSX中呈现的对象数组 [英] REACT JS: Map over an array of objects to render in JSX
问题描述
我是React JS的新手。问题是我需要在这段代码中显示数据库中的所有字段。我已经能够在浏览器控制台中获取所有数据作为对象，并且我能够在浏览器中查看数组中的最后一块数据但是无法查看它们。请原谅我代码中的错误格式，因为我是新手。请提前感谢.....
I am new to React JS The question is that I need to display all the fields from my database in this piece of code. I have been able to obtain all the data as objects in the browser console and I am able to view the last piece of data in the array in the browser but have not been able to view them. Please forgive me for the wrong format in the code as I am new to this.Thanks in advance.....
输出和代码
浏览器视图：
Land of Toys Inc.的名称131是ID
Browser View: Land of Toys Inc. is the name 131 is the ID
JSON数据：
{"posts":[
{"id":"103","name":"Atelier graphique"},
{"id":"112","name":"Signal Gift Stores"},
{"id":"114","name":"Australian Collectors, Co."},
{"id":"119","name":"La Rochelle Gifts"},
{"id":"121","name":"Baane Mini Imports"},
{"id":"124","name":"Mini Gifts Distributors Ltd."},
{"id":"125","name":"Havel & Zbyszek Co"},
{"id":"128","name":"Blauer See Auto, Co."},
{"id":"129","name":"Mini Wheels Co."},
{"id":"131","name":"Land of Toys Inc."}
]}
此数据是通过编写为插件的PHP代码获得的，该插件采用JS代码中给出的url形式
This data is obtained through a PHP code written as a plugin which is in the form of a url which is given in the JS code
http：//localhost/Akshay/REACT/testDataAPI.php？user = 2& num = 10& format = json
我的代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>React Tutorial</title>
<!-- Not present in the tutorial. Just for basic styling. -->
<link rel="stylesheet" href="css/base.css" />
<script src="https://npmcdn.com/react@15.3.0/dist/react.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.0/dist/react-dom.js"></script>
<script src="https://npmcdn.com/babel-core@5.8.38/browser.min.js"></script>
<script src="https://npmcdn.com/jquery@3.1.0/dist/jquery.min.js"></script>
<script src="https://npmcdn.com/remarkable@1.6.2/dist/remarkable.min.js"></script>
</head>
<body>
<div id="content"></div>
<script type="text/babel">
var UserGist = React.createClass({
getInitialState: function() {
return {
username:[],
companyID:[]
};
},
componentDidMount: function()
{
var rows = [];
this.serverRequest = $.get(this.props.source, function (result) {
for (var i=0; i < 10; i++)
{
var lastGist = result.posts[i];
//console.log(result.posts[i]);
this.setState({
username: lastGist.id,
companyID: lastGist.name
});
}
}.bind(this));
},
componentWillUnmount: function() {
this.serverRequest.abort();
},
render: function() {
return (
<li>{this.state.companyID} is the name {this.state.username} is the ID</li>
);
}
});
ReactDOM.render(
<UserGist source="http://localhost/Akshay/REACT/testDataAPI.php?user=2&num=10&format=json" />,
document.getElementById('content')
);
</script>
</body>
</html>
推荐答案
使用map来渲染数据。并将json存储为状态本身的javascript对象而不是两个单独的数组。
Use map to render your data. and store the json as a javascript object in the state itself instead of two seperate arrays.
<!-- Not present in the tutorial. Just for basic styling. -->
<link rel="stylesheet" href="css/base.css" />
<script src="https://npmcdn.com/react@15.3.0/dist/react.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.0/dist/react-dom.js"></script>
<script src="https://npmcdn.com/babel-core@5.8.38/browser.min.js"></script>
<script src="https://npmcdn.com/jquery@3.1.0/dist/jquery.min.js"></script>
<script src="https://npmcdn.com/remarkable@1.6.2/dist/remarkable.min.js"></script>
<div id="content"></div>
<script type="text/babel">
var UserGist = React.createClass({
getInitialState: function() {
return {
data: [{"id":"103","name":"Atelier graphique"},
{"id":"112","name":"Signal Gift Stores"},
{"id":"114","name":"Australian Collectors, Co."},
{"id":"119","name":"La Rochelle Gifts"},
{"id":"121","name":"Baane Mini Imports"},
{"id":"124","name":"Mini Gifts Distributors Ltd."},
{"id":"125","name":"Havel & Zbyszek Co"},
{"id":"128","name":"Blauer See Auto, Co."},
{"id":"129","name":"Mini Wheels Co."},
{"id":"131","name":"Land of Toys Inc."}]
};
},
componentDidMount: function()
{
},
componentWillUnmount: function() {
this.serverRequest.abort();
},
render: function() {
return (
<div>
{this.state.data.map(function(item, index){
return <li>{item.name} is the company name, {item.id} is the ID</li>
})}</div>
);
}
});
ReactDOM.render(
<UserGist source="http://localhost/Akshay/REACT/testDataAPI.php?user=2&num=10&format=json" />,
document.getElementById('content')
);
</script>
</html>
JSFIDDLE
对于小提琴示例，我删除了您的 $。get（） componentDidMount 中的代码。
For the fiddle example I have deleted your $.get() code in componentDidMount.
P.S。将状态数组数据创建为对象数组，如
小提琴示例中所示
P.S. Create the state array data as an array of object as shown in the fiddle example
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