JavaScript登录表单document.getElementById未检测到值
[英]JavaScript Login form document.getElementById is not detecting value
问题描述
Can anybody tell me why document.getElementById is not detecting the entered password in the code below: 
谁能告诉我为什么document.getElementById没有在下面的代码中检测到输入的密码：
function myFunction() { let email = "name@email.com"; let password = "password"; if (document.getElementById("password") == password) { Console.console.log("success"); } else { console.log("Failure"); console.log(password); console.log(document.getElementById("password")); } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Login</title> </head> <body> <form action="#"> <label for="Email">Email</label> <input id="email" type="email"> <label for="password">Password</label> <input id="password" type="text"> <button onclick="myFunction()">Submit</button> </form> </body> </html>
When I try to log it's value in the console I just get input id="password" type="text"and I am not sure what this means other than for some reason it is not having the value I want assigned to it. 当我尝试在控制台中记录它的值时，我只是得到输入id =“ password” type =“ text”，除了由于某种原因它没有我想要分配的值之外，我不确定这意味着什么。
-Thanks -谢谢
3 个解决方案
解决方案1
2 已采纳 2018-09-01 17:24:00
The function document.getElementById returns a DOM Element Object. 函数document.getElementById返回DOM元素对象。 This object has various attributes like .style , but to get the text entered for an <input> element, you want the .value attribute. 该对象具有各种属性，例如.style ，但是要获取为<input>元素<input>的文本，您需要.value属性。
function myFunction() { let email = "name@email.com"; let password = "password"; if (document.getElementById("password").value == password){ console.log("success"); } else { console.log("Failure"); console.log(password); console.log(document.getElementById("password").value); } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Login</title> </head> <body> <form action="#"> <label for="Email">Email</label> <input id="email" type="email"> <label for="password">Password</label> <input id="password" type="text"> <button onclick="myFunction()">Submit</button> </form> </body> </html>
解决方案2
0 2018-09-01 17:39:06
Change these lines 更改这些行
if(document.getElementById("password") == password){
console.log(document.getElementById("password"));
to these lines 这些行
if(document.getElementById("password").value == password){
console.log(document.getElementById("password").value);
and Bob's your uncle. 而鲍勃是你的叔叔。
解决方案3
0 2018-09-01 17:40:17
your implementation is ok, but you did a slight mistake. 您的实现还可以，但是您犯了一个小错误。 document returns an object with multiple keys. 文档返回带有多个键的对象。 Among those keys 'value' key contains the value of your input field. 在这些键中，“值”键包含输入字段的值。
document.getElementById("password").value
will return your desired value. 将返回您想要的值。
Note: You can access all the attributes from this object. 注意：您可以从该对象访问所有属性。 For example 例如
document.getElementById("password").placeholder
will return the hint from the input field 将从输入字段返回提示
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