Menu
Javascript represents all numbers as double-precision floating-point. This means it loses precision when dealing with numbers at the very highest end of the 64 bit Java Long datatype -- anything after 17 digits. For example, the number:
714341252076979033
... becomes:
714341252076979100
My database uses long IDs and some happen to be in the danger zone. I could change the offending values in the database, but that'd be difficult in my application. Instead, right now I rather laboriously ensure the server encodes Long IDs as Strings in all ajax responses.
However, I'd prefer to deal with this in the Javascript. My question: is there a best practice for coercing JSON parsing to treat a number as a string?
970
This example shows one technique to reduce the number of Ajax calls that are made to the server by caching more data than is needed for each draw. This is done by intercepting the Ajax call and routing it through a data cache control; using the data from the cache if available, and making the Ajax request if not.
Reducing the number of requests performed, and the amount of data included in both sides of the transaction, will have a dramatic impact on your Ajax performance. Making server changes will help, too, but may be beyond your control.
They are all equally fast, the only question is which you find most readable. If you will be making numerous similar ajax calls then it is best to use $. ajaxSetup() in an accessible place (read: near top). This allows you to pre-set your most common settings, thereby creating your own short-cut function.
In my app, there are a lot of ajax calls. A user may do 50 ajax calls per session, so speed is very important. The ajax call queries the database and returns a list of records.
You do have to send your values as strings (i.e. enclosed in quotes) to ensure that Javascript will treat them as strings instead of numbers.
There's no way I know of to get around that.
189
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
