问题描述
我知道类似的问题已经被问过很多次，但我还没有找到适合我的解决方案.我的问题很简单.我要做的就是测试 popup.html 上的操作，因为在这里，我在弹出窗口上有一个单击按钮，当我单击它时，我想显示警报.但是什么也没发生.它没有找到元素.我不明白这里出了什么问题.
I know similar questions have been asked many times, but I didn't find a solution for mine yet. My question is really simple. All I want to do is to test actions on popup.html, for here, I have a click button on popup, when I click it, I want to show alert. But nothing happened. It's not finding the element. I don't understand what's going wrong here.
manefest.json
{
"name": "test",
"version": "1.0",
"description": "test",
"manifest_version":2,
"browser_action": {
"default_icon": "logo.png",
"default_popup":"popup.html"
},
"permissions": [
"tabs",
"http://*/*",
"notifications"
]
}
popup.html
<html>
<head>
<title>Test</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="popup.js"></script>
</head>
<body>
<button id='btn'>click</button>
</body>
</html>
popup.js
$('#btn').click(function (){
alert("test");
};
推荐答案
问题是你的代码在 <script> 标签被读取后立即执行，即在你的元素存在于 DOM 之前.
The problem is that your code executes as soon as <script> tag is read, i.e. before your element exists in DOM.
将它包装在 $(document).ready() 中就可以了:
Wrap it in $(document).ready() and you're good to go:
$(document).ready(function() {
/* your code */
});
对于非 jQuery 解决方案，将其包装在 DOMContentLoaded 监听器中:
For a non-jQuery solution, wrap it in DOMContentLoaded listener:
document.addEventListener("DOMContentLoaded", function() {
/* your code */
});
最后，您可以简单地将 <script> 标记移动到 <body> 的末尾，但这是一个不太可靠的解决方案.
Finally, you can simply move the <script> tag to the end of <body>, but it's a less robust solution.
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