与此问题类似,Init polymer attributes before ready(),但不完全相同。
在该子元素的ready事件触发之前,是否可以在Polymer中强制设置子元素的属性?
https://plnkr.co/edit/fM7lAflOLWOFuIiE7e9q?p=preview
的index.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="https://polygit.org/components/webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="https://polygit.org/components/polymer/polymer.html" rel="import">
<link href="user-profile.html" rel="import">
</head>
<body>
<user-profile></user-profile>
</body>
</html>
用户profile.html:
<link href="https://polygit.org/components/polymer/polymer.html" rel="import">
<link href="address-card.html" rel="import">
<dom-module id="user-profile">
<template>
<address-card address$="{{address}}"></address-card>
</template>
<script>
Polymer({
is: "user-profile",
properties: {
address: {
type: String,
value: "Pass the value to the child"
}
}
});
</script>
</dom-module>
地址card.html:
<link href="https://polygit.org/components/polymer/polymer.html" rel="import">
<dom-module id="address-card">
<template>
{{content}}
</template>
<script>
Polymer({
is: "address-card",
properties: {
address: String
},
ready: function () {
alert(this.address);
}
});
</script>
</dom-module>
答案 0 :(得分:1)
元素<user-profile>
,将值{{primaryAddress}}
传递给他的子元素<address-card>
。元素<user-profile>
是一个“中介者”,可以控制/分配给孩子的价值。
<dom-module id="user-profile">
<template>
…
<address-card address="{{address}}"></address-card>
</template>
…
properties: {
address: {
type: String,
value: "Pass the value to the child"
}
}
</dom-module>
答案 1 :(得分:0)
在这种情况下,我使用数据绑定系统将值从父级传递给子级。