Created
November 22, 2019 01:58
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hien thi error message su dung visibility
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset='utf-8'> | |
| <meta http-equiv='X-UA-Compatible' content='IE=edge'> | |
| <title>Page Title</title> | |
| <meta name='viewport' content='width=device-width, initial-scale=1'> | |
| </head> | |
| <body> | |
| <div> | |
| User name <input type="text" id="name"> <span id="invalidName" style="color: red; visibility: hidden;">Username is required.</span> | |
| </div> | |
| <div> | |
| Password <input type="password" id="password"> <span id="invalidPw" style="color: red; visibility: hidden;">Password is required.</span> | |
| </div> | |
| <button onclick="login()">Login</button> | |
| <script> | |
| function login() { | |
| var flag = true; | |
| var name = document.getElementById("name").value; | |
| var password = document.getElementById("password").value; | |
| document.getElementById("invalidName").style.visibility = "hidden"; | |
| document.getElementById("invalidPw").style.visibility = "hidden"; | |
| if (name == '') { | |
| document.getElementById("invalidName").style.visibility = "visible"; | |
| flag = false; | |
| } | |
| if (password == '') { | |
| document.getElementById("invalidPw").style.visibility = "visible"; | |
| flag = false; | |
| } | |
| if(flag != false) | |
| { | |
| if (name == 'admin' && password == 'admin') { | |
| alert("Dang nhap thanh cong"); | |
| } else { | |
| alert("Dang nhap that bai"); | |
| } | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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