How to pass client side javascript return value to ASP classic server side
11,470
If you want to send it to server during normal html page submit, put the return value in hidden field.
If you want to send the value before the form submit, use AJAX.
Hidden Field method
JavaScript
function test(abc) {
var ddlArray = new Array();
var ddl = document.getElementById('AdjusterList');
for (i = 0; i < ddl.options.length; i++) {
ddlArray[i] = ddl.options[i].value;
}
var indexsel = ddl.selectedIndex;
document.getElementById("returnValueField").value = indexsel;
return indexsel ;
}
HTML
<input type="hidden" id="returnValueField" name="returnValueField" />
In ASP access this hidden field like an other form field.
For AJAX use some library like jQuery to make things easier.
Using AJAX with jQuery
First you need to include the jQuery library in your page.
Then modify your function like this
function test(abc) {
var ddlArray = new Array();
var ddl = document.getElementById('AdjusterList');
for (i = 0; i < ddl.options.length; i++) {
ddlArray[i] = ddl.options[i].value;
}
var indexsel = ddl.selectedIndex;
// Ajax call starts
$.ajax({
url: "your_asp_page_to_handle_request.asp",
data: {"selected_index": indexsel },
success: function() {
alert("I am back after sending data sucessfully to server.");}
});
// Ajax call ends
return indexsel ;
}
Your ASP code in your_asp_page_to_handle_request.asp will be something like this
<%
dim selectedIndex
selectedIndex = Request.QueryString("selected_index")
%>
Please note that you can also use jQuery.get() instead of the Ajax function we used above.
Author by
user1093452
Updated on June 27, 2022Comments
-
user1093452 almost 2 years
javascript
function test(abc) { var ddlArray = new Array(); var ddl = document.getElementById('AdjusterList'); for (i = 0; i < ddl.options.length; i++) { ddlArray[i] = ddl.options[i].value; } var indexsel = ddl.selectedIndex; return indexsel ; }
ASP
strArrayCRN = osRecordSet.RecordCount strArrayCRN2 = osRecordSet2.RecordCount dim StrCount StrCount =strArrayCRN+strArrayCRN2
HTML +ASP
<select name="AdjusterList" id="AdjusterList" onchange='test("<%=StrCount%>")'><% %> <option value="0">Please choose an option from the list.</option> <% Do While (osRecordSet.EOF = False) %><option value="<%=osRecordSet.RowPosition%>"> <%=osRecordSet.Fields("NAME")%></option> <% osRecordSet.MoveNext Loop %><% Do While (osRecordSet2.EOF = False) %><option value="<%=osRecordSet2.RowPosition%>"> <%=osRecordSet2.Fields("NAME")%></option> <% osRecordSet2.MoveNext Loop %>
Here i want to pass the return value of function test() i.e value of the selected index to asp server side