Truly Random String in Javascript Asynchronously

Question

I am using a javascript function to generate a random string:

function S4() {
   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}

function guid() {

    /*$.ajax({
        type: "GET",
        url: "uuid.php",
        cache: false,
        success: function(html){
            return html;
        }
    });*/

   return (S4()+S4()+S4()+S4());
}

And I want to make it utilize a php uuid library that I've found, the problem is I need it to run in javascript. I use the guid() function a lot and I've been trying to think of an elegant way of grabbing the uuid, that I request using the ajax object (commented out above). The uuid page that just prints random uuids each time is sitting locally next to this page. I would not like to make the request synchronous because, like I said, I use it quite a bit and would prefer to not have everything halt every time this thing makes a request. Or perhaps there's a method I could use of jQuery that be as fast and not hinder performance?

I'm not adverse to changing things up a bit, like would the best practice here to acquire a uuid on load? But the number of UUIDs I generate is completely dynamic, and dependent upon the user.

Thank you!

What do you mean by "sitting locally next to this page"? The "next to" relationship doesn't make sense when applied to pages. Also, what are you using the GUID for? What PHP library are you using? Depending on the use, the technique of generating the GUID may not be suitable. — outis
– outis, Commented Aug 29, 2011 at 22:02
possible duplicate of How to create a GUID / UUID in Javascript? — Jacob Eggers
– Jacob Eggers, Commented Aug 29, 2011 at 22:29

powtac · Accepted Answer · 2011-08-29 21:55:18Z

2

Check the uniqid() function from phpjs.org.

answered Aug 29, 2011 at 21:55

powtac

41.1k28 gold badges120 silver badges173 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Tuan · Accepted Answer · 2011-08-29 22:07:12Z

1

How about adding a callback argument to the guid() function, wherein you can assign a value to something:

function guid(callback) {
    $.ajax({
        type: "GET",
        url: "uuid.php",
        cache: false,
        success: function(html){
            callback(html);
        }
    });
}

var value;

guid(function (result) {
    value = result;
});

answered Aug 29, 2011 at 22:07

Tuan

5,4221 gold badge24 silver badges17 bronze badges

Collectives™ on Stack Overflow

Truly Random String in Javascript Asynchronously

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related