1）如何将此值作为prop1传递给Child1组件 2）如果我只是将状态值传递给Child1组件，我没有得到Child1中的更新值 -
关注不同的文章 - 关于在兄弟姐妹之间传递道具但没有任何作用.. 父：
export default class Parent extends Component {
constructor(props) {
super(props);
this.state = {
toggledata: '',
};
}
handleToggle(value) { //getting the updated value to 'value'
this.setState({ toggledata: value });
}
render() {
return (
<div>
<Child1 ToggleStatus={this.state.toggledata} />
<Child2 callbackFromParent={this.handleToggle.bind(this)} />
</div>
);
}
}
Parent.propTypes = {
params: PropTypes.object,
};
CHILD2：
class Child1 extends Component {
constructor(props) {
super(props);
this.state = {
text: '',
};
}
handleClick(event) {
this.setState({ text: 'green' }, () => {
this.props.callbackFromParent(this.state.text);
});
}
render(){
return (
<a onClick={() => { this.handleClick(event) }} href="">
Click me
</a>
);
}
}
export default Child1;
答案 0 :(得分：0)
您没有将 body {margin:0;
background-image: url("Road.png");
background-repeat: no-repeat;
background-position: center;
background-size: cover;
}
p {
font-family: Verdana; font-size: x-large; text-align: center; margin-top: 300px;
}
h1 {
text-align: center; font-family: Verdana; font-size: x-large; font-style: italic;
}
a {
text-decoration: none;
color: white;
}
.Coming Soon {
color: white;
}
.Logo {
width: 130px; height: 80px; margin-right: 100px;
}
.socialmedia {
position:fixed;
right:150px;
top:35px;
transform:translate(0,-50%);
display: flex; /* add this */
align-items: center; /* add this */
}
.preorder button {
background-color: white;
border: 0;
height: 35px;
width: 110px;
margin-left: 35px;
}
.footer {
display: flex;
align-items: center;
width: 100%;
height: 90px;
margin-top: 319px;
}绑定到回调。
你的父母没有调用<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>WEBSITE TITLE HERE</title>
<!-- Bootstrap Core CSS -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- Custom CSS: You can use this stylesheet to override any Bootstrap styles and/or apply your own styles -->
<link href="css/custom.css" rel="stylesheet">
<script src="https://use.fontawesome.com/a0aac8df13.js"></script>
<meta name="Description" content="ADD DESCRIPTION.">
<meta name="Keywords" content="ADD KEYWORDS">
<link rel="icon" href="Logo.png" type="img/SVG" style="width: 100%; height: 100%">
</head>
<body>
<div class="container">
<div class="Coming Soon">
<h1>Some Header</h1>
<div class="socialmedia">
<img src="Logo.png" style=" width: 130px; height: 80px; margin-right: 100px">
<a class="Facebook">
<a href="https://www.facebook.com/" target="_blank"><img src="https://images.seeklogo.net/2016/09/facebook-icon-preview-1.png" width="50px" height="50px"></a>
</a>
<a class="Instagram">
<a href="https://www.instagram.com/" target="_blank"><img src="https://images.seeklogo.net/2016/06/Instagram-logo.png" width="50px" height="50px"></a>
</a>
<a class="Youtube">
<a href="https://www.youtube.com/channel" target="_blank"><img src="https://images.seeklogo.net/2016/06/YouTube-icon.png" width="50px" height="50px"></a>
</a>
</div>
<p>Some Paragraph</p>
<div class="footer">
<p style="font-family: Verdana; font-size: small; padding-left: 55%;">2017 Some Company LLC | City State Company Website All Right Reserved.</p>
</div></div></div>
</body>
</html>，而是在this内调用它。 this.setState中Child2的上下文来自Child2，如果不绑定它，则不是Parent。
this