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When I recently integrated Facebook Connect with Tersus , I initially received the error messages Invalid Enumeration Value and Handler already exists when trying to call Facebook API functions.
It turned out that the cause of the problem was
object.x...
Started by Youval Bronicki on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
I never....
The common check for undefined is therefore done like this:
typeof x == "undefined"
this ensures the type of the variable is really undefined.
The problem is that undefined compared to null using == gives true.
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Say I have the following code:
function One() {} One.prototype.x = undefined; function Two() {} var o = new One(); var t = new Two();
o.x and t.x will both evaluate to undefined . o.hasOwnProperty('x') and t.hasOwnProperty('x') will both return false;...
Started by Claudiu on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
Something like this?
function isDefined(var....
Prop); if (o.x === undefined && contains(prop, 'x')) { //x is defined, but set to undefined }
where putting a watch on One.x but that would only tell you at the time it gets undefined.
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<div> <span onmouseover="tip(event,this);">程序错误<div class="content">good</div></span><br> <span onmouseover="tip(event,this);">程序错误<div class="content">good</div></span><br> <span onmouseover...
Started by zjm1126 on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Use event.clientX, event.offsetX or event.x
As noted, if you are going do this with straight JS, you'd have to use pageY/pageX for most browsers and clientX/clientY... .
IE doesn't support event.pageY/event.pageX.
IE uses clientX / clientY, not pageX / pageY.
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I've been using XAMPP version 1.6 with no problems.
I changed to version 1.7 and with my same code, I'm getting a whole lot of messages like
Undefined variable and Undefined Index
my code is:
$row = mysql_fetch_row($Results)
$netassets[$row[4]] = $netassets...
Started by mickeymouse on
, 12 posts
by 3 people.
Answer Snippets (Read the full thread at apachefriends):
Thats....
In line 112
Notice: Undefined index: 9 ...in line: Undefined variable: Bal ...in line 111
but I got rid of these by defining $Bal=0; at the beginning of my you want to use them.
: 1 ...in line 111
Notice: Undefined index: 2 ...
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Hello,
I'm a bit confused about Javascript undefined & null.
Firstly what does if (!testvar) actually do? Does it test for undefined and null or just undefined?
Secondly, once a variable is defined can I clear it back to undefined (therefore deleting ...
Started by AJ on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
TestVar = undefined; //typeof(testVar....
To check for a null values is
if ( testVar !== null ) { // do action here }
and for undefined
if ( testVar !== undefined ) { // do action here }
You can assign a avariable with undefined.
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Why does the the RegExp /^\w+$/ match undefined ?
Example code:
alert(/^\w+$/.test(undefined));
This will display true in Firefox 3 (only browser I tested it on).
Started by cdmckay on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
/(\w)(\w)(\w)(\w)(\w)/.exec(undefined);
returns: ["undef", "u", "n", "d", "e", "f"]
It is treating undefined....
When undefined is cast to a string (which the regex does), it produces the string "undefined" , which is then matched.
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What's the best way of checking if an object property in JavaScript is undefined?
Sorry, I initially said variable rather than object property. I believe the same == undefined approach doesn't work there.
Started by Matt Sheppard on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
If (somevariable == undefined) { alert('the variable is not defined!'); }
You can also make it into a function, as shown here :
function isset(varname){ return(typeof(window[varname]) != 'undefined'); }
In JavaScript there is null and there....
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So I have been through most of the questions here. Also quite a few articles good and bad.
One thing I am looking for some additional clarification on is how undefined and un declared variables are treated.
Take the code below.
var a; if(a == null) //...
Started by Knife-Action-Jesus on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
So when you do need to test, I would write it something like this:
if( typeof(a) != '....
I have to navigate through object where any of the parents could be undefined .
I can immediately assume c is undefined if a is undefined?
Yes.
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How to resolve undefined references [linker error] in dev cpp?
Started by mark on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
If you're linking to a library, such as the math library libmath, be sure to link to the library in your makefile/compilation... .
Sounds like you aren't linking up all required object files and libraries .
You look at where the error is and fix your typo .
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When I nm on one of my libs:
nm libmylib.so
I get a line like this
U _ZNSs4_Rep20_S_empty_rep_storageE@@GLIBCXX_3.4
I checked the man page for nm and I got "U" The symbol is undefined. What does an undefined symbol really mean?
If it is really undefined...
Started by bbazso on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Alternatively the symbol is undefined because you've library so you would expect that to be undefined....
An undefined symbol is a symbol that the library uses but was not defined in any of the object needs to be linked in to your application.
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