Hi all,
I am new to ASP, i am making a page on which i have a list box and a textbox.
I have dynamically populated the list box from data on the server, what i want it that , when i select a option on the list box the corresponding value should come on the text box on its own, without having to press any other button..
eg : i have a table on the database with fields
'course name'
'course cost'
so when i select the course name from the listbox, the textbox should show the cost of the course.
What i figured out after googling for it was that i will have to reload the page on the "on change event " of the list box and get the value and fill the text box.didn't really understand that well.
Can somebody please tell me, how is that suppose to be done ??
I know Vbscript yet..
Thank's.......
3  7510  
Hi there aashishn86!
Sounds like you are going to need some client side scripting. In other words, unless you are using a .NET postback, you will need to have assign the listbox an onchange event that will call a j/s function to populate your text box.
The j/s for this wouldn't be too tough. Assuming the following(just for demonstration purposes): -
<%
-
-
myDynamicallyPopulatedValue = "Test"
-
-
Response.write "<select name='mySelect' id='mySelect' onchange='updateUI(this.value);' value=''>"
-
Response.write "<option value='" & myDynamicallyPopulatedValue & "' >" & myDynamicallyPopulatedValue & "</option>"
-
Response.write "</select>"
-
Response.write "<input type='text' name='myTargetBox' id='myTargetBox' value='' />"
-
-
%>
-
Now for the j/s to make it work: -
<script type="text/javascript">
-
function updateUI(userValue)
-
{
-
var userSelection = userValue;
-
var targetBox = document.getElementById("myTargetBox");
-
targetBox.value = userSelection;
-
}
-
</script>
-
Something like that should work. Not sure you have a lot of options for performing a client-side browser update without refreshing the document.window(probably not good) or using client-side controls.
Best Regards,
Jenkins
-
<%@ LANGUAGE="VBScript" %>
-
<html>
-
<body>
-
-
<script type="text/javascript">
-
function updateUI(userValue)
-
{
-
var userSelection = userValue;
-
var targetBox = document.getElementById("myTargetBox");
-
TargetBox.value = userSelection;
-
}
-
</script>
-
-
-
-
<%
-
strcon = "provider=sqloledb;data source=1.234.5.678,1234;initial catalog = abcde; User Id=abcdef ;password=abcde"
-
Set objcon = Server.CreateObject("ADODB.Connection")
-
objcon.ConnectionString = strcon
-
objcon.Open
-
-
strsql = "select cname from test3"
-
-
Set objrset = Server.CreateObject("ADODB.Recordset")
-
objrset.Open strsql,strcon,2,3,1 %>
-
-
-
<select name = "select one" onchange= 'updateUI(this.value)' >
-
<% while not objrset.eof %>
-
<option value = "<%=objrset("cname")%>"><%=objrset("cname")%></option>
-
<%objrset.movenext
-
wend %>
-
</select>
-
-
-
<input type = "text" size="20" name="mytargetbox">
-
-
</body>
-
</html>
-
this is what i am writing..
it doesn't seem to work .
the error i get is .
"targetbox is undefined"
line 10 column 1
i am using classic asp...
Ok, just so you are aware, javascript is case sensitive. Change your function to this: -
<script type="text/javascript">
-
function updateUI(userValue)
-
{
-
//Remove the alert line once you have confirmed you are getting the correct value.
-
alert (userValue);
-
var userSelection = userValue;
-
var targetBox = document.getElementById("mytargetbox");
-
targetBox.value = userSelection;
-
}
-
</script>
-
The undefined error was a result of the DOM not being to locate the element b/c of differences in the case. It is a literal string comparison.
Let me know if you require additional assistance.
Best Regards,
Jenkins
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