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Check if variable is (defined) not working in JavaScript

Got confused by this behaviour. I thought doing something like: if (variable name) { ... do this... } should work. However if the variable is not defined, I just get \'ReferenceError: Can\'t find v[详细]

2023-03-28 19:54 分类：问答
One function is not defined when trying to do two function recursion

I have a page which clients sometimes leave open for extended periods of time without refreshing (over 24hrs).Some of the actions on that page require valid PHP session so I have built a simple set of[详细]

2023-03-28 18:51 分类：问答
Error when compiling with GCC

Every time I compile I get the following error message: Undefined reference to ( function name ) Let\'s say I have three files: Main.c, printhello.h, printhello.c. Main.c calls function print_hello[详细]

2023-03-27 18:57 分类：问答
Crypto++ Code::blocks Undefined reference problem

I\'m trying to create a C++ program using Crypto++ (with C开发者_如何学Pythonode::Blocks), but keep getting stuck with the same problem. I\'m using a cut-down version of this code : http://andreyvitde[详细]

2023-03-27 17:49 分类：问答
javascript undefined check not working

in javascript i am trying to check if a \"key\" has been defined on an array, and if it doesn\'t create it and assign a value 0 to it.[详细]

2023-03-27 17:45 分类：问答
JavaScript getElementsByTagName() Undefined, IE Failure, AJAX XML file

I\'ve been writing this code to dynamically load photo links from an XML document retrieved via AJAX. I have a global varibale xDoc that stores the response XML, and that I use in other functions so t[详细]

2023-03-26 09:38 分类：问答
document.getElementById on an input element returning undefined

I am creating a quid of quizz splitted on mulitple pages and I try to pass the score of each question to the next page using the get method with javascript.[详细]

2023-03-25 23:30 分类：问答
JQuery Post Undefined

Can someone please tell me what I\'m doing wrong here. I\'ve done a post call many times before without issues but today this one is giving me problems. I\'m using asp.net MVC 3[详细]

2023-03-25 18:36 分类：问答
Why can not acces the property of object after which had been changed inner function？

slider= options.images[n]; //slider is an object with: title, src etc. properties but without \"width\" and \"height\" properties.[详细]

2023-03-24 04:05 分类：问答
what is wrong with this jquery delegate code?

function onBodyLoad() { document.addEventListener(\"deviceready\",onDeviceReady,false); //for testing in safari only, comment out for deploy to iphone with phonegap[详细]

2023-03-23 17:38 分类：问答