Har*_*anu 5 data-binding web-component 2-way-object-databinding polymer polymer-1.0
在下面的示例中,如何
obj.name将<input>字段的变量绑定<test-element2>到<test-element>？
以下是我的代码.我有两种聚合物元素.test-element将数据绑定到obj.name.test-element2有一个输入字段,由函数观察objChanged.无论我在输入字段中更改了什么值,它都会更改并打印,test-element2但更改不会反映出来test-element.任何人都可以帮助将价值反映到test-element1？我有一个解决方案this.fire("object-change")用于文本更改时,但我正在寻找一个不使用事件监听器的解决方案.
还有一件事是我需要从脚本创建一个元素,它不能在HTML DOM中硬编码.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script src="../../bower_components/webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="../../bower_components/polymer/polymer.html"/>
</head>
<body>
<dom-module id="test-element">
<template>
<div>Hello <span>{{obj.name}}</span></div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
"obj": {
type: Object,
notify: true
}
},
observers: [
"objChanged(obj.name)"
],
"objChanged": function() {
var that = this;
console.log("First element in 1",that.obj);
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}"/>
</template>
<script>
Polymer({
is: "test-element2",
properties: {
"obj": {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
},
observers: [
"objChanged(obj.name)"
],
ready: function() {
var element = new TestElement();
element.set("obj", this.obj);
this.appendChild(element);
},
"objChanged": function() {
console.log("changed in test-element2:", this.obj);
}
});
</script>
</dom-module>
<test-element2></test-element2>
</body>
</html>
如果包含<test-element>在<template>of中test-element2，则可以避免使用事件侦听器或观察器。以这种方式处理和test-element2之间的数据绑定input<test-element>为您
下面是一个实时工作示例，它obj按照您在元素中设置的方式维护该属性。
<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents.min.js"></script>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="test-element">
<template>
<div>Hello <span>[[obj.name]]</span>
</div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
"obj": {
type: Object,
notify: true
}
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}" />
<test-element obj="[[obj]]"></test-element>
</template>
<script>
Polymer({
is: "test-element2",
properties: {
"obj": {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
}
});
</script>
</dom-module>
<test-element2></test-element2>目前，Polymer 1.0 之外的<template is="dom-bind">.
我建议像下面的示例一样设置观察者或调整您的要求以包含<test-element>在test-element2.
button {
display: block;
}<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents.min.js"></script>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="test-element">
<template>
<div>Hello <span>[[obj.name]]</span>
</div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
obj: {
type: Object,
notify: true
}
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}" />
</template>
<script>
Polymer({
is: "test-element2",
properties: {
obj: {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
},
observers: ["objNameChanged(obj.name)"],
objNameChanged: function(newValue) {
Polymer.dom(document).querySelectorAll("test-element").forEach(function(element) {
element.notifyPath("obj.name", newValue);
});
Polymer.dom(this.root).querySelectorAll("test-element").forEach(function(element) {
element.notifyPath("obj.name", newValue);
});
}
});
</script>
</dom-module>
<test-element2></test-element2>
<button>Add test-element to <em>test-element2</em>
</button>
<button>Add test-element to <em>body</em>
</button>
<script>
var testElement2 = document.querySelector("test-element2");
var createTestElement = function(insertPoint) {
var testElement = new TestElement();
testElement.notifyPath("obj.name", testElement2.obj.name);
insertPoint.appendChild(testElement);
};
document.querySelector("button:nth-of-type(2)").addEventListener("click", function() {
createTestElement(Polymer.dom(document).querySelector("body"));
});
document.querySelector("button").addEventListener("click", function() {
createTestElement(Polymer.dom(testElement2.root));
});
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