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**JohnKrutsch** · Jun 20, 2002, 02:23 PM

Do you have a url where we can see this in action?

**ku916** · Jun 20, 2002, 03:46 PM

I'm not sure if you can see much, because all the JSP are executed at server-side, I guess you can still get to the javascript and the HTML. Try this link ....

http://141.154.21.206:8080/test/cmp_...amp_tactic_tab

Try to enter some text in the first screen and the click the "Selection Criteria" button to the the next screen. In the "Selection Criteria", if you click browser "back" you will get back to List Request screen with all the previously entered data.
But if you click on the little calendar (pop-up) beside the "User Due Date" text field and click "back" all the data are lost ....

Let me know what you think?

**JohnKrutsch** · Jun 20, 2002, 04:06 PM

I don't think this is causing the problem but it is throwing up errors, so cahnge this:

<input type="image" name="selection criteria" src="selection_criteria_button.gif" onClick="return request_validate(this);">

to this:

<input type="image" name="selection criteria" src="selection_criteria_button.gif">

You are already doing the validation with the onsubmit of the form.

I ll keep looking fo rother stuff. Anyone else should feel free to jump in as well.

**JohnKrutsch** · Jun 20, 2002, 04:10 PM

Also try changing your link that calls the calendar to this:

<a href="#" onclick="show_calendar('document.job_form.user_due_date', document.job_form.user_due_date.value);return false;">
<img src="cal.gif" width="16" height="16" border="0"></a>

This way we don't use href to invoke the call to the function.

**ku916** · Jun 20, 2002, 08:57 PM

Tried both, didn't work.

However, I did created 2 pages (HTML) without any JSP code and they seems to work. So could it be possible that for JSP, the browser back button actually execute the JSP code again to create the HTML, instead of bring out the previous HTML from browser's cache?

wild guess here!

**whammy** · Jun 20, 2002, 09:22 PM

I definitely don't think that's the case... unless you send a request to the server specifically (which clicking the back button in your browser doesn't do), you're not going to execute ANY server-side code, no matter what the language.

I wish I had an explanation for it... I'm not familiar with JSP though, so I can't really help in that area :-/

**ku916** · Jun 25, 2002, 12:48 PM

I've changed my approach to the problem ...

Instead of letting users hit "back" button to go vack in history, I've disabled all browser back buttons and created a link that is pointing to the previous URI (using request.getHeader("Referer") in JSP).

However, I've got myself into a whole different problem. When someone submit the 1st page, there is a javascript to do data validations, if no errors submit the form to a hidden page (perform a single row database insert stmt). But it seems that 2 rows will get inserted into the database instead of 1.

Looking at the javascripts and the event handlers that call them, it seems that the form was being submitted twice

code below:
<html>
<head>
<script language="Javascript">
function request_validate(x){
valid_form = true;
if (x.job_name.value == "") {
valid_form=false;
alert('Job Name is empty');
}
if (valid_form) {
x.submit();
}
else
return false;
}

</script>
</head>

<body text="#000000" marginwidth=0 leftmargin=0 rightmargin=0 topmargin=10 bgcolor="#e5e5e5" link="#e5e5e5" vlink="#e5e5e5" alink="#e5e5e5"
>
<div align=center>

<FORM NAME="camp_info_form" ACTION="cmp_list_request_insert.jsp" METHOD="post" onSubmit="return request_validate(this);">
<a href ="cmp_job_search.jsp?state=new&source=list_copy"><img src=copy_job.gif></a>
<input type="image" name="selection criteria" src="selection_criteria_button.gif">
</TD>
</TR>
</TABLE>
</FORM>

</body>
</html>

so I've removed the onSubmit in <FORM> tag (thanks from John) and put the call in the image to look like this
<input type="image" name="selection criteria" src="selection_criteria_button.gif" onClick="return request_validate(this);">

now when I hit the submit, it will submit the form (only once ~ great), but it skips the data validations?

I'm so close .... just need little more pointers for javascript ....
thanks
Ku

**JohnKrutsch** · Jun 25, 2002, 01:30 PM

When using the input type of image, it functions as a submit button. When you have code in there like this:

<input type="image" name="selection criteria" src="selection_criteria_button.gif" onClick="return request_validate(this);">

you are asking it to validate the image as this is referening to the input tag you are in. Try having the form tag like this:

<FORM NAME="camp_info_form" ACTION="cmp_list_request_insert.jsp" METHOD="post" onSubmit="return request_validate(this);">

and your image submit button like this:

<input type="image" name="selection criteria" src="selection_criteria_button.gif">

Announcement

Form data disappear after browser back button click

Form data disappear after browser back button click

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