Javascript 尝试访问chrome扩展中表单元素的值时出错
我正在做一个chrome扩展,当按下按钮时,我会得到当前url和输入字段中的值 但我得到了一个错误:Javascript 尝试访问chrome扩展中表单元素的值时出错,javascript,html,forms,google-chrome,Javascript,Html,Forms,Google Chrome,我正在做一个chrome扩展,当按下按钮时,我会得到当前url和输入字段中的值 但我得到了一个错误: Uncaught TypeError: Cannot read property 'value' of null at HTMLButtonElement.myAlert 行中: var ip = document.getElementById('ip_dns').value; 如何正确获取和存储该值 这是我的密码: popup.html <!doctype html> <
Uncaught TypeError: Cannot read property 'value' of null at HTMLButtonElement.myAlert
行中:
var ip = document.getElementById('ip_dns').value;
如何正确获取和存储该值
这是我的密码:
popup.html
<!doctype html>
<html>
<head>
<title>DNS Teste</title>
<script src="popup.js"></script>
</head>
<body>
<form>
IP DNS
<input type="text" ip="ip_dns">
<button id="btn">Teste</button>
</form>
</body>
</html>
manifest.json
{
"manifest_version": 2,
"name": "Getting started example",
"description": "This extension shows a Google Image search result for the current page",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"permissions": [
"activeTab",
"https://ajax.googleapis.com/",
"tabs"
]
}
它起作用了
函数myAlert(){
//chrome.tabs.getSelected(空,函数(选项卡){
//var url=tab.url;
//日志(“url:+url”);
// });
var ip=document.getElementById('ip_dns')。值;
控制台日志(“IP:+IP”);
}
document.addEventListener('DOMContentLoaded',函数(){
document.getElementById('btn')。addEventListener('click',myAlert');
});代码>
IP DNS
睾丸
这里有输入错误:,也许这就是问题所在?换成
{
"manifest_version": 2,
"name": "Getting started example",
"description": "This extension shows a Google Image search result for the current page",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"permissions": [
"activeTab",
"https://ajax.googleapis.com/",
"tabs"
]
}