global variables

[Soha]

I'm a beginner in using javascript and i need a reply so urgent;
i have a problem in using javascript with asp the problem is that i
want to define a global variable and then change the value of it after
clicking on a link which activate a function that changes the global
variable. this variable i use as the value of a hidden field in a form.
my problem is that the global variable dosen't change.
this is the code i used to do this:

//the function which shows a layer and changes the variable
<script>
var month_na=0;//global variable
function show_layer(month_no)
{
month_na=month_no;
document.getElementById("layern").style.visibility="visible";
return month_na;
}
</script>

//the link code <%=rs_trans_mo(0)%> is asp code and is evaluated to 3
<a onclick="show_layer(<%=rs_trans_mo(0)%>);" style="color:
#0000FF;cursor:hand;">+</a>

//the form that uses the global variable
<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>
<script language=javascript>
//the hidden field used to send the global variable to the
insert_trans.asp page
if (month_na!=0)
{document.write ('<input type="hidden" name="month_no"
value="'+month_na+'">');}
</script>
<input type="hidden" name="year_no" value="<%=year_no%>">
</form>
</td>

logically this code must work but i don't know why it dosen't. plz try
to reply ass soon as possible coz i need this very urgently.
thank u all

 

[Randy Webb]

I'm a beginner in using javascript and i need a reply so urgent;
i have a problem in using javascript with asp the problem is that i
want to define a global variable and then change the value of it after
clicking on a link which activate a function that changes the global
variable. this variable i use as the value of a hidden field in a form.
my problem is that the global variable dosen't change.
this is the code i used to do this:

//the function which shows a layer and changes the variable
<script>
var month_na=0;//global variable
function show_layer(month_no)
{
month_na=month_no;
document.getElementById("layern").style.visibility="visible";
return month_na;
}
</script>

//the link code <%=rs_trans_mo(0)%> is asp code and is evaluated to 3
<a onclick="show_layer(<%=rs_trans_mo(0)%>);" style="color:
#0000FF;cursor:hand;">+</a>

//the form that uses the global variable
<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>
<script language=javascript>
//the hidden field used to send the global variable to the
insert_trans.asp page
if (month_na!=0)
{document.write ('<input type="hidden" name="month_no"
value="'+month_na+'">');}
</script>
<input type="hidden" name="year_no" value="<%=year_no%>">
</form>
</td>

If you make month_no a visible field, you will see that it is never
changed because nothing in your code changes it. What you need instead
of a global variable is to simply update the hidden field.

In the future, please do not post your ASP code, its irrelevant. When
posting code, post the code that is transmitted to the browser.

logically this code must work but i don't know why it dosen't.

It works, it just doesn't do what you want it to do.

 

[Soha]

It works, it just doesn't do what you want it to do.
I know that it dosen't do what i want that's why i post this code.
I just want to know what u mean with update the hidden field?

and sorry for posting the asp code and here is the code that is
transmited to the browser:

//the function which shows a layer and changes the variable
<script>
var month_na=0;
function show_layer(month_no)
{
month_na=month_no;
document.getElementById("layern").style.visibility="visible";
return month_na;
}
</script>
//the link code
<a onclick="show_layer(3);" style="color: #0000FF;cursor:hand;">+</a>
//the form that uses the global variable and it is shown only when the
user click on the link
<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>
//the hidden field used to send the global variable to the
insert_trans.asp page
<script language=javascript>
if (month_na!=0){
document.write ('<input type="hidden" name="month_no"
value="'+month_na+'">');}</script>
<input type="hidden" name="year_no" value="2000">
</form>
</td>

 

[Soha]

It works, it just doesn't do what you want it to do.
I know that it doesn't do what i want it to do that's why i post this
problem
Sorry for the asp code and here is the code again without the asp code

//the function which shows a layer and changes the variable
<script>
var month_na=0;//global variable
function show_layer(month_no)
{
month_na=month_no;
document.getElementById("layern").style.visibility="visible"­;
return month_na;
}
</script>


//the link code
<a onclick="show_layer(3);" style="color: #0000FF;cursor:hand;">+</a>


//the form that uses the global variable
<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>
<script language=javascript>
//the hidden field used to send the global variable to the
insert_trans.asp page
if (month_na!=0)
{document.write ('<input type="hidden" name="month_no"
value="'+month_na+'">');}
</script>
<input type="hidden" name="year_no" value="2000">
</form>
</td>

i just want to know what you mean with :

update the hidden field

And thank you

 

[Randy Webb]

I know that it doesn't do what i want it to do that's why i post this
problem
Sorry for the asp code and here is the code again without the asp code

//the function which shows a layer and changes the variable
<script>
var month_na=0;//global variable
function show_layer(month_no)
{
month_na=month_no;
document.getElementById("layern").style.visibility="visible"­;
return month_na;
}
</script>


//the link code
<a onclick="show_layer(3);" style="color: #0000FF;cursor:hand;">+</a>


//the form that uses the global variable
<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>
<script language=javascript>
//the hidden field used to send the global variable to the
insert_trans.asp page
if (month_na!=0)
{document.write ('<input type="hidden" name="month_no"
value="'+month_na+'">');}
</script>
<input type="hidden" name="year_no" value="2000">
</form>
</td>

i just want to know what you mean with :



And thank you

<script type="text/javascript">
function show_layer(month_no)
{
document.getElementById("layern").style.visibility="visible"­;
//updates the hidden field:
document.forms['myForm'].elements['month_no'].value = month_no;
}
</script>


//the link code
<a onclick="show_layer(3);" style="color: #0000FF;cursor:hand;">+</a>


[note]A link that goes nowhere (not even an href attribute) is invalid
[note]HTML but it also makes your pages inaccessible to non-JS people.

<td id="layern" style="visibility:hidden;" nowrap>
<form method="POST" action="insert_trans.asp" name="myForm">
day: <input type="text" name="day_no" size="20">
<p>main rate:<input type="text" name="main_rate" size="20"></p>
<p>paid rate:<input type="text" name="paid_rate" size="20"></p>
<p><input type="submit" value="Submit" name="B1"></p>

[note]No need to dynamically insert the hidden field, just hard code it.

<input type="hidden" name="month_no" value="1">

<input type="hidden" name="year_no" value="2000">
</form>
</td>

 

[Richard Cornford]

I know that it doesn't do what i want it to do that's
why i post this problem

<snip>

The point is that when what code does doesn't correspond with what it is
intended to do the intention cannot be deduced form the code. You have
to actually say what it is that would qualify as "working", because the
computer is going to do exactly what you programmed it to do regardless
of intentions and so code, as such, always "works".

Richard.

 

[Soha]

Thank u so much for your help. now the code works the same way i wanted