RE: [PHP] Javascript array [] length is undefined when only singl e element

On 18 February 2004 01:21, Daevid Vincent contributed these pearls of wisdom: > Okay kids. Here's another strange one. Very simple form. The > array is dynamically generated from PHP as per the suggested > method: > http://us2.php.net/manual/en/faq.html.php#faq.html.arrays > > However, when there is only a single element, the > myMultiSelect.length is > undefined in javascript. > If there are two or more elements, then the length works as > expected... Correct. If there is only a single element with a name, JavaScript creates a single scalar checkbox property with that name; if there are multiple elements with the same name, it creates an array of those elements as that property. The existence of the '[]' in the element name has no significance for JavaScript -- it goes solely on how many of the elements there are. Checking whether the .length property exists is one way of telling whether you have a single element or multiple ones! Cheers! Mike -- Mike Ford, Electronic Information Services Adviser, Learning Support Services, Learning & Information Services, JG125, James Graham Building, Leeds Metropolitan University, Beckett Park, LEEDS, LS6 3QS, United Kingdom Email: m.ford@leedsmet.ac.uk Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211