我正在使用Polymer的一些演示 . 这个在这里:
https://www.polymer-project.org/components/core-ajax/demo.html
有效的代码如下所示:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Ajax this.</title>
<script src="../bower_components/platform/platform.js"></script>
<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../bower_components/core-ajax/core-ajax.html">
</head>
<body>
<core-ajax auto url="http://gdata.youtube.com/feeds/api/videos/"
params='{"alt":"json", "q":"chrome"}'
handleAs="json"></core-ajax>
<template repeat="{{response.feed.entry}}">
<div>{{title.$t}}</div>
</template>
<script>
document.addEventListener('polymer-ready', function() {
var ajax = document.querySelector("core-ajax");
ajax.addEventListener("core-response",
function(e) {
document.querySelector('template').model = {
response: e.detail.response
};
}
);
});
</script>
</body>
</html>
哪个工作得很好 . 但我想将这个演示封装在一个名为“test-element.html”的聚合物元素中,但它不起作用:
<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../bower_components/core-ajax/core-ajax.html">
<polymer-element name="test-element">
<template>
<core-ajax auto url="http://gdata.youtube.com/feeds/api/videos/"
params='{"alt":"json", "q":"chrome"}'
handleAs="json"></core-ajax>
<template repeat="{{response.feed.entry}}">
<div>{{title.$t}}</div>
</template>
<script>
document.addEventListener('polymer-ready', function() {
var ajax = document.querySelector("core-ajax");
ajax.addEventListener("core-response",
function(e) {
document.querySelector('template').model = {
response: e.detail.response
};
}
);
});
</script>
</template>
<script>
Polymer('test-element', {
});
</script>
</polymer-element>
当我在index.html中使用元素并导入时,没有显示任何内容:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Javascript Playground</title>
<script src="../bower_components/platform/platform.js"></script>
<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="test-element.html">
<link rel="import" href="ajax-feedback.html">
</head>
<body>
<style>
* {margin: 0; padding: 0;}
</style>
<h1>Hello World</h1>
<test-element></test-element>
<ajax-feedback></ajax-feedback>
</body>
</html>
请有人向我解释,为什么我不能只将demo的代码放在聚合物元素中,然后在我的index.html中重新导入它?
非常感谢你 .
乔治 .
1 回答
两件事:document.querySelector()赢了't work here: polymer elements use the shadow dom, which will hide the elements from CSS and querySelector(), and you'已经这么做了 . 你不应该在
<template>
中使用<script>
标签,而且你不会使用't need to hard code JS to carry the response to where it' .这是简单的方法:
然后使用它: