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jQuery: checking if the value of a field is null (empty)
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The value of a field can not be null, it's always a string value.
The code will check if the string value is the string "NULL". You want to check if it's an empty string instead:
if ($('#person_data[document_type]').val() != ''){}
or:
if ($('#person_data[document_type]')....
WPF: Grid with column/row margin/padding?
...ny layout panels that demonstrate this kind of functionality.
You can add extra rows or columns as you suggested. But you can also set margins on a Grid element itself, or anything that would go inside a Grid, so that's your best workaround for now.
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Get a random item from a JavaScript array [duplicate]
...n) given a number, or given anything else, a guaranteed random value!
For extra fun, the array return is generated by calling the function recursively based on the array's length :)
Working demo at http://jsfiddle.net/2eyQX/
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Python Empty Generator Function
...ike this solution because it's (relatively) concise, and it doesn't do any extra work like comparing to False.
– Pi Marillion
Jan 24 '16 at 2:27
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Convert JSON String To C# Object
Trying to convert a JSON string into an object in C#. Using a really simple test case:
13 Answers
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What's the proper value for a checked attribute of an HTML checkbox?
...lse value.
If the attribute is present, its value must either be the empty string or a value that is an ASCII case-insensitive match for the attribute's canonical name, with no leading or trailing whitespace.
Conclusion:
The following are valid, equivalent and true:
<input type="checkbox" checke...
How do I create a category in Xcode 6 or higher?
... for the category interface and implementation is still working, so that's extra easy: type @interface-category and @implementation-category.
Import it from Xcode 5! Use this command:
cp -r /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Templates/Fil...
What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
...Array, NSDictionary, and NSNumber (just like one can create literals for NSString)
NSArray Literals
Previously:
array = [NSArray arrayWithObjects:a, b, c, nil];
Now:
array = @[ a, b, c ];
NSDictionary Literals
Previously:
dict = [NSDictionary dictionaryWithObjects:@[o1, o2, o3]
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Mac OS X Terminal: Map option+delete to “backward delete word”
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Fantastic, that requires no extra setup. I notice <Esc> b and <Esc> f also work for jumping back or forwards one word.
– joeytwiddle
Feb 3 '15 at 9:31
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How to set custom header in Volley Request
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It looks like you override public Map<String, String> getHeaders(), defined in Request, to return your desired HTTP headers.
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