ASP/Javascript - Send ASP value to Javascript Function

Question

Is it possible to call a JS function, with a value from an ASP script?

I thought it was possible, so I tried the following method but I can't seem to get it to run. As you can see, I have an ASP variable "totalPages" in the JS call.

Response.Write "<form name=""pageSkip"" onsubmit=""return validatePageSkip("&totalPages&")"">"

I then have the JS function, which is:

function validatePageSkip(totalPages)
{
     if (document.pageSkip.pn.value.length > totalPages)
     {
         alert("Please enter a page number within range!");
         document.pageSkip.pn.focus();
         return(false);
     }
     document.pageSkip.submit();
}

Is this possible?
If yes, what am I doing wrong?

UPDATE

It won't even work just using this, when I submit with an empty text box:

Response.Write "<form name=""pageSkip"" id=""pageSkip"" onsubmit=""return validatePageSkip()"" method=""post"" action=""?cpr="&pageRange&"#main"">"
Response.Write "<input type=""text"" name=""cpn"" id=""cpn"" spellcheck=""false"" autocomplete=""off"" size=""3"" class=""pageSkipBox"" value="""&currentPage&""">"
Response.Write "</form>"

With this simple JS function:

function validatePageSkip()
{
if (document.pageSkip.cpn.value.length < 1)
{
alert("Test!");
document.pageSkip.cpn.focus();
return(false);
}
document.pageSkip.submit();
}

I really don't know what is wrong. The form submits perfectly but it just won't call the function.

Can you spot anything?

Where is validatePageSkip written? How? Maybe you don't have it in the proper place. Anyway, add more alert commands into that function, one in the very beginning (before the if) — user447356
– user447356, Commented Sep 21, 2011 at 8:34

John Hartsock · Accepted Answer · 2011-09-20 23:58:47Z

3

Yes it is possible. but you need to make sure you escape your quotes correctly

Response.Write "<form name=""pageSkip"" onsubmit=""return validatePageSkip("&totalPages&")"">"

Personally I would prefer doing something like this in the head

<head>
   <script type="text\javascript">
     var totalpages = <%=totalPages%>;
   </script>
</head>

Then

Response.Write "<form name=""pageSkip"" onsubmit=""return validatePageSkip(totalpages)"">"

edited Sep 20, 2011 at 23:58

answered Sep 20, 2011 at 23:53

John Hartsock

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9 Comments

Thom Smith Over a year ago

In ASP Classic, you escape quote by doubling, i.e. "<form name=""pageSkip"" onsubmit=""return validatePageSkip(" & totalPages & ")"">".

John Hartsock Over a year ago

@Thom Smith Yes...I have become accustom to .Net

TheCarver Over a year ago

My double quotes were in-fact in place from the start, I wrote the form tag off the top of my head and ended up sticking Response.Write at the start in a last minute thing... This still isn't happening for me. I haven't got a submit button, is it possible that is causing it not to work? It's part of my recordset paging, first, prev, textbox, next, last, so there is no button

John Hartsock Over a year ago

@Martin G If you do not have a submit button then how are you submitting the form and triggering the submit event in javascript?

TheCarver Over a year ago

The form depends on the user clicking return to submit it. The actually functionality of the form works perfectly, apart from validating the input against the ASP value

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