Detecting Undefined Variables in JavaScript
This pops up every so often so I thought I’d dedicate a post to it. JavaScript has no “isset” function. Instead, your best bet is to use the following:
if((typeof theVariable) == ‘undefined’)
Subscribe
September 24, 2006
Related
Today's crazy error of the day is: Fatal error: Call to undefined function preg_match() ... Wahoo! A built in function being undefined! So how's this possible? It seems that if you reinstall PHP without compiling in PCRE (Perl Compatible...
What is the difference between the write function and the innerHTML property? There is a huge difference. What happens to any JavaScript you import using these methods? It's more complicated than you think. The write() function (as in, document.write), writes...
No Comments »
TrackBack URI |
Blog RSS 
|
Comment RSS
No comments yet.