javascript - Determine if conversion from string to 32-bit integer will overflow

Question

Trying to do front-end validation on an HTML input instead of throwing an exception in the Java back-end.

score 2 · Accepted Answer

Check whether the number is more than 2147483647.

For example:

if (parseInt(num, 10) > 2147483647)
    //BAD!!!

score 1 · Accepted Answer

if ((the_number >> 0) != the_number) {
  // overflow...
}

You still need a server-side check because the client-side may turn off Javascript, etc.

score 0 · Accepted Answer

0

Just check:

if (parseInt(myNumberAsString, 10) > 2147483647) {  alert("Invalid int!"); }

于 2010-02-17T16:39:42.770 回答

3 回答 3