Simple Ajax application.

<MCE: script language = "JavaScript"> <! -- <Br/> var request = false; </P> <p> var flag = true; </P> <p> // create an instance of the xmlhttprequst object <br/> function createrequest () <br/>{< br/> If (window. XMLHttpRequest) <br/>{< br/> request = new XMLHttpRequest (); <br/>}< br/> else if (window. activexobject) <br/>{< br/> request = new activexobject ("msxml2.xmlhttp"); <br/>}< br/> If (! Request) {<br/> alert ("error initializing XMLHttpRequest! "); <Br/>}</P> <p> function getisnotrepeat () {<br/> createrequest (); <br/> var exportdate = document. frmexico portsubjectbalance. strexportsubjectbalancedate. value; <br/>/* modify here */<br/> var url = "<% = strcontext %>/findexistsubjectbalance. JSP? Exportdate = "+ exportdate; <br/> request. open ("get", URL, false); <br/> request. onreadystatechange = updatepage; <br/> request. send (null); <br/>}</P> <p> function updatepage () {<br/> If (request. readystate = 4) {<br/> If (request. status = 200) {<br/> var resptext = request. responsetext; <br/>/* You need to modify it here */<br/>/* 1 is returned, and the account balance already exists */<br/> If (resptext = 1) {<br/> If (confirm ('account balance already exists, are you sure you want to import it again? ') {<Br/> flag = true; <br/>} else {<br/> flag = false; <br/>}< br/> // --> </MCE: SCRIPT>

The control page has the following code:

Printwriter = response. getwriter (); <br/>/* database operation result */<br/> printwriter. println (isexist); <br/> printwriter. flush (); <br/> printwriter. close ();