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我想作一個Twitter的引導我React.js項目navbar
一個Twitter的引導導航欄,但我目前收到以下錯誤, TypeError: this.props.brand is undefined
如何使在React.js項目
我發現this codepen昨晚,作者創建一個導航欄,我實現了下面的代碼,但我仍然得到上述錯誤。
的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>chrisrjones.com</title>
</head>
<body>
<div id="app"></div>
<div id="hello"></div>
<div id="navbar"></div>
<script src="/bundle.js" ></script>
</body>
</html>
main.js
import React from 'react';
import ReactDOM from 'react-dom';
var Hello = require('./components/hello');
var NavBar = require('./components/navbar');
ReactDOM.render(
<Hello/>,
document.getElementById('hello')
);
ReactDOM.render(
<NavBar/>,
document.getElementById('navbar')
);
navbar.js
var React = require('react');
// import React, { PropTypes } from 'react';
// create classes
var NavBar = React.createClass({
render: function(){
return(
<nav className="navbar navbar-inverse">
<div className="container-fluid">
<div className="navbar-header">
<button type="button" className="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-collapse" aria-expanded="false">
<span className="sr-only">Toggle navigation</span>
<span className="icon-bar"></span>
<span className="icon-bar"></span>
<span className="icon-bar"></span>
</button>
<NavBrand linkTo={this.props.brand.linkTo} text={this.props.brand.text} />
</div>
<div className="collapse navbar-collapse" id="navbar-collapse">
<NavMenu links={this.props.links} />
</div>
</div>
</nav>
);
}
});
var NavBrand = React.createClass({
render: function(){
return (
<a className="navbar-brand" href={this.props.linkTo}>{this.props.text}</a>
);
}
});
var NavMenu = React.createClass({
render: function(){
var links = this.props.links.map(function(link){
if(link.dropdown) {
return (
<NavLinkDropdown links={link.links} text={link.text} active={link.active} />
);
}
else {
return (
<NavLink linkTo={link.linkTo} text={link.text} active={link.active} />
);
}
});
return (
<ul className="nav navbar-nav">
{links}
</ul>
);
}
});
var NavLinkDropdown = React.createClass({
render: function(){
var active = false;
var links = this.props.links.map(function(link){
if(link.active){
active = true;
}
return (
<NavLink linkTo={link.linkTo} text={link.text} active={link.active} />
);
});
return (
<li className={"dropdown " + (active ? "active" : "")}>
<a href="#" className="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
{this.props.text}
<span className="caret"></span>
</a>
<ul className="dropdown-menu">
{links}
</ul>
</li>
);
}
});
var NavLink = React.createClass({
render: function(){
return(
<li className={(this.props.active ? "active" : "")}><a href={this.props.linkTo}>{this.props.text}</a></li>
);
}
});
// set data
var navbar = {};
navbar.brand =
{linkTo: "#", text: "React Bootstrap Navbar"};
navbar.links = [
{linkTo: "#", text: "Link 1"},
{linkTo: "#", text: "Link 2"},
{dropdown: true, text: "Dropdown", links: [
{linkTo: "#", text: "Dropdown Link 1"},
{linkTo: "#", text: "Dropdown Link 2", active: true}
]}
];
// render NavBar
// React.render(
// <NavBar {...navbar} />,
// document.getElementById("navbar")
//);
module.exports = NavBar
;
我有一個代碼塊,你在我的例子'是你有一部分navbar.js' – Chris
提,但你不能傳遞,在道具,像codepen例子是幹什麼的,我覺得你的新反應,道具是從外部傳遞的值,比如通過父路徑到子路徑,所以您需要在NavBar中傳遞此對象。 –
使用this.props.brand檢查NavBar的comp,但它沒有得到任何道具,所以拋出提到的錯誤。將數據放在Main.js中,並將這些值傳遞給道具,它將工作:) –