Problems refreshing page with AJAX
Hello,
I have never used AJAX but today I decided to try it to improve my current implementation of a "processing" page that I use to display a waiting message and to check every 5 seconds if a response is available. If it is, the user is redirected to a "processing done" page.
My previous implementation used the refresh tag provided by HTML in the "processing" page:
<meta HTTP-EQUIV="Refresh" CONTENT="5; URL=<%=request.getContextPath()%>/main/CheckForResponse.do"/>
Every 5 seconds a struts action is executed and the action itself will forward to the "processing done" page when a response is available.
This solution works, however I don't like the refresh page effect, so I was trying to use AJAX instead. Now I put in the "processing" page the following script:
function checkForResponse()
var xmlHttp;
try
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
catch (e)
// Internet Explorer
try
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
catch (e)
try
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
catch (e)
alert("Your browser does not support AJAX!");
return false;
xmlHttp.open("GET","<%=request.getContextPath()%>/main/CheckForResponse.do",true);
xmlHttp.send(null);
}and I have the following html body tag.
<body onLoad="setInterval('checkForResponse()',5000);">
The function executes correctly and the struts action is also executed. However the problem is that for some reason the action doesn't forward to the "processing done" page. It does actually, if I debug, but nothing happens, the "waiting" page keeps being displayed.
Does anyone have an idea about what I could be doing wrong? any suggestion?
Thanks a lot!!
Did you define the call back function correctly? like===
xmlhttp.onreadystatechange = handleHttpEvent;
function handleHttpEvent(){
if (xmlhttp.readyState == 4) {
if (xmlhttp.status == 200) {
// GO TO PROCESSING END PAGE
} else {
window.alert("ERROR");
}Also, you might want to check the progress bar application
in bpcatalog -> http://bpcatalog.dev.java.net
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Unmark *‘Fire on page load’* and *‘Stop execution on error’*
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Include the following True Actions AFTER the Execute PL/SQL Code true Action.
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Unmark ‘Fire on page load’
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http://www.w3schools.com/HTML/html_links.asp
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Parent Page I call this function from a report link column to display a modal window. Sets the hidden SAVE_STATUS field in destination page to ‘N’
function modalWin(pshow)
var url;
url='f?p=&APP_ID.:'+pshow+':&SESSION.::::SAVE_STATUS:N';
if (window.showModalDialog) {
window.showModalDialog(url,"name","dialogWidth:650px;dialogHeight:700px"); }
else {
window.open(url,"name","height=700,width=650,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no ,modal=yes");
Destination page (modal window)
HTML Header.
The function closeWindow should refresh the parent page and close the modal window.
<base target=_self>
<script language="JavaScript" type="text/javascript">
<!--
htmldb_delete_message='"DELETE_CONFIRM_MSG"';
function closeWindow() {
if ( document.getElementById("SAVE_STATUS").value == 'Y' )
window.opener.location.href=window.opener.location.href;
window.close();
//-->
</script>
Html Body attribute.
onLoad="closeWindow();"
P_UPDATE_DATE process called from the Apply changes button. Sets the SAVE_STATUS flag to ‘Y’ for the onload in the html body.
UPDATE event
SET event_date = :P5001_EVENT_DATE
WHERE contract_reference = :P330_EVD_CONTRACT
AND event_number = :P330_EVD_EVENT_NUMBER;
:SAVE_STATUS := 'Y';
Thanks in advance, I will have a look when back in the office on Monday.
Cheers PeteHi Chris,
Thanks for your help. I think I've sorted it using your first suggestion doing a refresh in the parent page, I just didn't know how at the time.
What I've got in the parent window after the call to the modal window is the reload window.location.reload(); and in the modal window I close it using window.close(); The down side being the refresh happens if I use my 'Apply changes' or 'Cancel' button but I can live with that for now.
It seems to work in IE and firefox but as I say most of what I'm doing is cobbling together using other peoples code without really understanding exactly what it does. Anyway thanks for your help, sound like I should look into JQUERY when I have time.
Thanks Pete
Parent window call to modal
function modalWin(pshow)
var url;
url='f?p=&APP_ID.:'+pshow+':&SESSION.::::SAVE_STATUS:N';
if (window.showModalDialog) { window.showModalDialog(url,"name","dialogWidth:650px;dialogHeight:700px"); }
else {
window.open(url,"name","height=700,width=650,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no ,modal=yes");
window.location.reload();
Modal Window Close.
window.close();
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