send information from server to Javascript (client)

Question

0.00/5 (No votes)

See more:

Hi
my javascript code gets some info from the server

javacode:

CallGenerateIDHandler();

function CallGenerateIDHandler() {
    $.ajax({
        url: "GenerateID.ashx",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: { 'Type': 'ID' },
        responseType: "json",
        success: OnComplete,
        error: OnFail
    });
    return false;
}
function OnComplete(result) {
    alert([result.Id]);
}
function OnFail(result) {
    alert('Request failed');

}

the

alert([result.Id]);

alert me the result I want but how can I return this value instead of

return false;

Posted 28-Aug-15 0:07am

Lalyka

Updated 28-Aug-15 3:31am

v3

Add a Solution

Comments

Sinisa Hajnal 28-Aug-15 6:19am

Google MVC (or .NET) json result.

Amit Jadli 28-Aug-15 7:58am

http://www.codeproject.com/Articles/203621/Call-HTTPhandler-from-jQuery-Pass-data-and-retriev

Lalyka 28-Aug-15 8:32am

Thanks the link is so helpfull. Just I want to return sth from handler, I do not want to pass any data from ajax.
can you guide me how to set the jason?

F-ES Sitecore 28-Aug-15 9:16am

I don't understand....if the alert works then you already have the value you want at the client, so what's the issue?

Lalyka 28-Aug-15 9:24am

I want to return the value, instead of return false

F-ES Sitecore 28-Aug-15 9:38am

You'll need to make the call synchronously (rather than asynchronously). Code will be something like below, but this is untested, you might need to mess around with it a bit. Also the fact that you are returning false is probably because you're stopping a click event from happening so you might need to use preventDefault to stop that if you find your page refreshing

function CallGenerateIDHandler() {
id = 0;

$.ajax({
async:false,
url: "GenerateID.ashx",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: { 'Type': 'ID' },
responseType: "json",
success: function(result){id = result.Id;},
error: OnFail
});
return id;
}
function OnFail(result) {
alert('Request failed');

}

xszaboj 28-Aug-15 9:41am

Yes this is going to work for you, but the problem with this approach is that it will block you UI thread so page will not respond until you get response back. That is very important thing to mention!

Lalyka 28-Aug-15 9:47am

thanks, but I need this information to continue. I think it would be a good choice, thanks alot for the help

Lalyka 28-Aug-15 9:46am

Thanks
Can you write it in a new solution so that I can approve it?
Thanks

xszaboj 28-Aug-15 9:59am

updated, but really think of a drawback here :) just saying.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

xszaboj · Accepted Answer · 2015-08-28T02:48:00

Ok now I see it :).

Your problem is that you are making ajax call which is asynchronous operation, that is why there is a callback(OnComplete/OnFail) function that is called after you get your response/error back.

So you can't return the values from CallGenerateIDHandler(); because this function runs synchronously.

What you can do is save value to to some element/localstorage in you OnComplete function. And then call process it.

What exactly are you trying to do?

Another solution is make synchronous call. same thing you have now but add
async:false,

Note:
This is going to work for you, but the problem with this approach is that it will block you UI thread so page will not respond until you get response back. That is very important thing to mention!