如何使用 Javascript 在我的 HTML 页面中获取输出
[英]How can i get output in my HTML page using Javascript
问题描述
I'm try to create a form with two input (Username and password) and one button(submit).
我尝试创建一个带有两个输入（用户名和密码）和一个按钮（提交）的表单。 my index.html code我的 index.html 代码
<!DOCTYPE html>
<html>
<head>
<title>login</title>
</head>
<body>
<form>
<p>username</p>
<input type="text" id="username" />
<p>Password</p>
<input type="text" id="Password" /><br>
<button type="button" onclick="getinfo()">submit</button>
</form>
<script src="main.js"></script>
</body>
</html>
then adding some javascript code for just getting a username and password which enter in username and password field in html form.然后添加一些 javascript 代码来获取用户名和密码，这些用户名和密码以 html 形式输入用户名和密码字段。 my main.js code我的 main.js 代码
function getinfo(){
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
alert("Name = " + username + "password = " + password);
}
But i don't getting any alert.但我没有收到任何警报。 i'm try to find out but i can't understand why my code is not working.when i search internet i find some related post but unfortunately it did not help,it's maybe for my little understanding in javascript , but i need help about this.我试图找出但我不明白为什么我的代码不起作用。当我搜索互联网时，我找到了一些相关的帖子，但不幸的是它没有帮助，这可能是我对 javascript 的一点理解，但我需要帮助这个。
1 个解决方案
解决方案1
8 已采纳 2018-01-28 21:21:48
The id in <input type="text" id="Password" /> has an upper case P , while in javascript you are calling it with a lower case p .该id在<input type="text" id="Password" />具有上壳体P，而在JavaScript您正在以较低的字母p调用它。
Note:注意：
Problems in your javascript code are usually easy to find using the browser console to check for errors.使用浏览器控制台检查错误通常很容易找到 JavaScript 代码中的问题。 The error thrown here was:这里抛出的错误是：
Uncaught TypeError: Cannot read property 'value' of null
so it was immediately obvious that one of the elements doesn't exist on the page.所以很明显页面上不存在其中一个元素。
Here is the corrected code:这是更正后的代码：
function getinfo() { var username = document.getElementById("username").value; var password = document.getElementById("password").value; alert("Name = " + username + " password = " + password); }
<!DOCTYPE html> <html> <head> <title>login</title> </head> <body> <form> <p>username</p> <input type="text" id="username" value="" /> <p>Password</p> <input type="text" id="password" value="" /><br> <button type="button" onclick="getinfo()">submit</button> </form> <script src="main.js"></script> </body> </html>
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.