A simple example of AJAX combined with PHP code to achieve login effect code

PHP script login. php: A simple example of AJAX combined with PHP code to achieve the login effect code

HTML section:
 

XML/HTML code

4. Function postRequest (strURL ){
5. Var xmlHttp;
6. If (window. XMLHttpRequest) {// For Mozilla, Safari ,...
7. Var xmlHttp = new XMLHttpRequest ();
8. }
9. Else if (window. ActiveXObject) {// For Internet Explorer
10. Var xmlHttp = new ActiveXObject ("Microsoft. XMLHTTP ");
11. }
12. XmlHttp. open ('post', strURL, true );
13. XmlHttp. setRequestHeader ('content-type', 'application/x-www-form-urlencoded ');
14. XmlHttp. onreadystatechange = function (){
15. If (xmlHttp. readyState = 4 ){
16. Updatepage (xmlHttp. responseText );
17. }
18. }
19. XmlHttp. send (strURL );
20. }
21. Function updatepage (str ){
22. If (str = "yes "){
23. Alert ("Welcome User ");
24. } Else {
25. Alert ("Invalid Login! Please try again! ");
26. }
27. }
28. Function call_login (){
29. Var username = parameter doc ument. f1.username. value;
30. Var password = parameter doc ument. f1.password. value;
31. Var url = "login. php? Username = "+ username +" password = "+ password;
32. PostRequest (url );
33. }

PHP script login. php:
 

PHP code

2. $ Username = $ _ GET ["username"];
3. $ Password = $ _ GET ["password"];
4. If ($ username = "admin" & $ password = "admin "){
5. Echo "yes ";
6. } Else {
7. Echo "No ";
8. }
9. ?>