google.setOnLoadCallback 无法获取文档元素 [英] google.setOnLoadCallback not able to get the document elements
问题描述
我正在尝试使用 JQuery 通过 corechart 获取一些图形功能，但是一旦加载了可视化 API，我就无法获取任何文档元素.下面是我的示例:
I am trying to get some graph functionalities with corechart using JQuery but I am not able to get any document elements once the visualization APIs are loaded. Below is my sample example:
$(document).ready(function() {
if ($("#myId").length > 0) {
google.load("visualization", "1.1", {
packages: ["corechart"]
});
google.setOnLoadCallback(function() {
if ($("#myId").length > 0) {
alert("Found a match!!");
}else{
alert("Not found!!");
}
});
}
});<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
</head>
<body>
<h1>Hello Plunker!</h1>
<div id="myId">Hello from Div!!</div>
</body>
</html>我希望执行 if 块中的警报.我仅在检查 #myId 后才加载可视化包，但在回调中丢失了(而不是所有 html 元素).请指教
I want the alert in my if block to be executed. I am loading the visualization packages only after the check for #myId but its lost(rather all the html elements) in the call back. Please advice
推荐答案
我觉得可能跟setOnLoadCallback有关.
但是，您可以在 load 语句中添加对回调的引用.
I think it may have something to do with setOnLoadCallback.
However, you can add a reference to the callback in the load statement.
$(document).ready(function(){
if ($("#myId").length > 0) {
google.load('visualization', '1', {
'packages': ['corechart'],
'callback': function(){
if ($("#myId").length > 0) {
alert("Found a match!!");
}else{
alert("Not found!!");
}
}
});
}
});<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
</head>
<body>
<h1>Hello Plunker!</h1>
<div id="myId">Hello from Div!!</div>
</body>
</html>我认为 setOnLoadCallback 承担双重责任，不仅要等待 google.load...
还有document
由于 document 已经被加载，可能有些东西被搞砸了...
I think setOnLoadCallback pulls double duty and not only waits for google.load...
but also the document
since document has already been loaded, maybe something gets fouled up...
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