Jquery UI autocomplete with Ajax: the novice stage

stage 2: novice
we will try to understand that thing a bit with our own server side.
add new item, choose Generic Handle, th filename will be Handler1.ashx.
paste this:
public void ProcessRequest(HttpContext context)
{
  context.Response.ContentType = "text/plain";
  JavaScriptSerializer jss = new JavaScriptSerializer();
  var x = new string[] { "ariel", "avraham", "aviel", "eliyahu", "eliezer" };
  context.Response.Write(jss.Serialize(x));
}

client side paste this
$(function () {
  $("#MyTextBox").autocomplete({ source: "Handler1.ashx" });
});

yep, the autocomplete source can get a pure handler. try it and see that we now have our own handler, now lets make it ajax with server side filter, start with asking for the same data but with the filter function
$("#MyTextBox").autocomplete({
  source: function (request, response) {
    $.ajax({
      url: "Handler1.ashx",
      success: function (data) {
        response($.map(data, function (item) {
          return { label: item }
        }))
      }
   })
  }
}); 

so how do we filter that? the request object have a thing call request.term, thats what the user put in the textbox, so we want to send it to our handler, so with using data{} on the ajax call we just send parameters to the QueryString on the server side so:

context.Response.ContentType = "application/json";
JavaScriptSerializer jss = new JavaScriptSerializer();
var filter = context.Request.QueryString["Filter"];
var x = new string[] { "ariel", "avraham", "aviel", "eliyahu", "eliezer" };
var response = jss.Serialize(x.Where(s => s.Contains(filter)));
context.Response.Write(response);

and client side

$.ajax({
  url: "Handler1.ashx",
  data: "Filter=" + request.term,
  success: function (data) {
    response($.map(data, function (item) {
      return { label: item }
    }))
  }
}) 

and BANG it does the magic! so here we learned how to make both server-side and cliend side simple autocomplete with ajax requests.

next some nice things we can do with all that except autocomplete
http://bresleveloper.blogspot.co.il/2013/04/jquery-ui-autocomplete-with-ajax_5.html
 

Comments

Post a Comment

Popular posts from this blog

OverTheWire[.com] Natas Walkthrough - JUST HINT, NO SPOILERS

game portal: http://overthewire.org/wargames/natas/ PASSWORDS for each level are stored in /etc/natas_webpass/natasX I made this walkthrough for people like me, i needed some help, but didnt want the spoiler, so here i will give you all the information needed to pass each level, yet not the solution. For levels needed custom web request i made a different post for powershell and javascript  with how-to's, since is a piece of learning for itself, and also for those of us that play at work and have only powershell at their hands. Although its not a complete spoiler there, its quite most of the solution so try yourself 1st. Natas The Natas game is from basic to advances web hacking. Every few levels is about whole new exploitation (with some harder ones doing comeback later), so a lot of learning. If you're new, you're the reason i am writing so much even for the 1st level, just please google EVERY topic you see, since in the following levels i assume you know the ...
Read more

Asp.Net Ending Response options, Response.End() vs CompleteRequest()

this blog is for any1 who get the ThreadAbortException when caling Response.End(), and then tried the other options such as HttpContext.Current.ApplicationInstance.CompleteRequest() and found out that there was no replacement. i'll start with the bottom line: if you want to stop right now your response and send it as is you dont have any other option other than Response.End(), period and it's the right thing to throw that EX in that case. the answer is its because there is the "HTTP pipeline" and the "Asp.Net pipeline", and CompleteRequest() cuts the HTTP pipeline but not the Asp.Net one so everything that is from handlers forwars (including all page events) continues but your part, the asp one, stays in your hands so that no information will be lost, so ur suppose to manage your code currectly, since information lost is really a bad thing, although in most cases we use Response.End() we know what we are losing and we want it. see this short article ab...
Read more

SOLVED The item could not be indexed successfully because the item failed in the indexing subsystem

if you got an error like this The item could not be indexed successfully because the item failed in the indexing subsystem. ( The item could not be indexed successfully because the item failed in the indexing subsystem.; Failed to recover content group; Aborting insert of item in Link Database because it was not inserted to the Search Index.; ; SearchID = 04081656-B51B-4DCD-96D4-6DB2D2CEEEE7 ) as well as these: The item could not be indexed successfully because the item failed in the indexing subsystem. ( The item could not be indexed successfully because the item failed in the indexing subsystem.; Caught exception when preparing generation GID[7]: (Previous generation (last=GID[6], curr=GID[7]) is still active. Cannot open GID[7]); Aborting insert of item in Link Database because it was not inserted to the Search Index.; ; SearchID = 92EB0180-C086-4853-BED8-F4878D9748AD ) the solution for me was to clear configuration cache (PS)  and then restart SP Search Services. THX ...
Read more