I recently found an interesting forum post which detailed how to generate GUIDs using JavaScript on the fly. Its very simple and looks as follows:
function S4() {
return (((1+Math.random())*0×10000)|0).toString(16).substring(1);
}
return (((1+Math.random())*0×10000)|0).toString(16).substring(1);
}
function generateGuid(){
return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4()).toUpperCase();
}
Originally posted by Dr John Stockton on thescripts.com.
3 Comments Received
The term 0×10000 in function s4() seems to be the source of error in my use of the proposed javascript GUID creator. Here is my proposed solution:
Untitled Document
function S4() {
// replace 0×10000 with this format: *parseInt(’10000′,16); RDF
return ((1+Math.random())*parseInt(’10000′,16)).toString(16).substring(1);
}
function generateGuid(){
return (S4()+S4()+”-”+S4()+”-”+S4()+”-”+S4()+”-”+S4()+S4()+S4()).toUpperCase();
}
// test the GUID generator
alert(generateGuid());
Oops, I have two more fixes to make the GUID a little more usable and a little more random…
Untitled Document
function S4() {
// add a seed to randome number generator, RDF
now = new Date();
seed = now.getSeconds();
// replace 0×10000 with this format: *parseInt(’10000′,16); RDF
// replace substring(1) with a 4 digit hex string like this: substring(1,5); RDF
return ((1+Math.random(seed))*parseInt(’10000′,16)).toString(16).substring(1,5);
}
function generateGuid(){
return (S4()+S4()+”-”+S4()+”-”+S4()+”-”+S4()+”-”+S4()+S4()+S4()).toUpperCase();
}
// test the GUID generator
document.writeln(generateGuid());
I made a few more fixes…
Untitled Document
function S4() {
// add a seed to randome number generator, RDF
now = new Date();
seed = now.getSeconds();
// replace 0×10000 with this format: *parseInt(’10000′,16); RDF
// replace substring(1) with a 4 digit hex string like this: substring(1,5); RDF
return ((1+Math.random(seed))*parseInt(’10000′,16)).toString(16).substring(1,5);
}
function generateGuid(){
return (S4()+S4()+”-”+S4()+”-”+S4()+”-”+S4()+”-”+S4()+S4()+S4()).toUpperCase();
}
// test the GUID generator
document.writeln(generateGuid());
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