AJAX ASP Example
AJAX is used to create more interactive applications.
AJAX ASP Example
The following example will demonstrate how a web page can communicate with a
web server while a user type characters in an input field:
Example
Start typing a name in the input field below:
Suggestions:
First name:
Example Explained
In the example above, when a user types a character in the input field, a function
called showHint() is executed.
The function is triggered by the onkeyup event.
Here is the code:
Example
<p>Start typing a name in the input field below:</p>
<p>Suggestions: <span id="txtHint"></span></p>
<form>
First name: <input type="text" onkeyup="showHint(this.value)"></form>
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
const xmlhttp = new XMLHttpRequest();
xmlhttp.onload = function() {
document.getElementById("txtHint").innerHTML = this.responseText;
}
xmlhttp.open("GET", "gethint.asp?q=" + str);
xmlhttp.send();
}
}
</script>
Try it Yourself »
Code explanation:
First, check if the input field is empty (str.length == 0). If it is, clear the
content of the txtHint placeholder and exit the function.
However, if the input field is not empty, do the following:
Create an XMLHttpRequest object
Create the function to be executed when the server response is ready
Send the request off to an ASP file (gethint.asp) on the server
Notice that q parameter is added gethint.asp?q="+str
The str variable holds the content of the input field
The ASP File - "gethint.asp"
The ASP file checks an array of names, and returns the corresponding name(s) to the
browser:
<%
response.expires=-1
dim a(30)
'Fill up array with names
a(1)="Anna"
a(2)="Brittany"
a(3)="Cinderella"
a(4)="Diana"
a(5)="Eva"
a(6)="Fiona"
a(7)="Gunda"
a(8)="Hege"
a(9)="Inga"
a(10)="Johanna"
a(11)="Kitty"
a(12)="Linda"
a(13)="Nina"
a(14)="Ophelia"
a(15)="Petunia"
a(16)="Amanda"
a(17)="Raquel"
a(18)="Cindy"
a(19)="Doris"
a(20)="Eve"
a(21)="Evita"
a(22)="Sunniva"
a(23)="Tove"
a(24)="Unni"
a(25)="Violet"
a(26)="Liza"
a(27)="Elizabeth"
a(28)="Ellen"
a(29)="Wenche"
a(30)="Vicky"
'get the q parameter from URL
q=ucase(request.querystring("q"))
'lookup all hints from array if length of q>0
if len(q)>0 then
hint=""
for i=1 to 30
if q=ucase(mid(a(i),1,len(q))) then
if hint="" then
hint=a(i)
else
hint=hint & " , " & a(i)
end if
end if
next
end if
'Output "no suggestion" if no hint were found
'or output the correct values
if hint="" then
response.write("no suggestion")
else
response.write(hint)
end if
%>
★
+1
Reference: https://www.w3schools.com/js/js_ajax_asp.asp
AJAX ASP Example
JavaScript is the world's most popular programming language.
JavaScript is the programming language of the Web.
JavaScript is easy to learn.
This tutorial will teach you JavaScript from basic to advanced.
JavaScript is the programming language of the Web.
JavaScript is easy to learn.
This tutorial will teach you JavaScript from basic to advanced.