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What is the difference between -viewWillAppear: and -viewDidAppear:?
... whenever the view was loaded into memory. So for example, if my view is a form with 3 labels, I would add the labels here; the view will never exist without those forms.
2) ViewWillAppear: I use ViewWillAppear usually just to update the data on the form. So, for the example above, I would use this...
What is a NullReferenceException, and how do I fix it?
...es is null.
// There is no Dictionary to perform the lookup.
Range Variable (Indirect/Deferred)
public class Person
{
public string Name { get; set; }
}
var people = new List<Person>();
people.Add(null);
var names = from p in people select p.Name;
string fi...
HTML5 form required attribute. Set custom validation message?
I've got the following HTML5 form: http://jsfiddle.net/nfgfP/
14 Answers
14
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Django admin: How to display a field that is marked as editable=False' in the model?
...option.
Original Answer
One way to do this would be to use a custom ModelForm in admin. This form can override the required field to make it editable. Thereby you retain editable=False everywhere else but Admin. For e.g. (tested with Django 1.2.3)
# models.py
class FooModel(models.Model):
fir...
Using the RUN instruction in a Dockerfile with 'source' does not work
... immediately follows. Because /bin/sh -c is the default shell, this "shell form" of RUN translates to RUN ["/bin/sh", "-c", "/bin/bash" "-c" "source /usr/local/bin/virtualenvwrapper.sh"]. You should go ahead and use the "exec form" of RUN so you can take the sh out like so RUN ["/bin/bash" "-c" "sou...
Python syntax for “if a or b or c but not all of them”
...
If you mean a minimal form, go with this:
if (not a or not b or not c) and (a or b or c):
Which translates the title of your question.
UPDATE: as correctly said by Volatility and Supr, you can apply De Morgan's law and obtain equivalent:
if (...
How to localize ASP.NET MVC application?
... MVC application very much in the same way you would a classic ASP.NET Web Form application.
You wouldn't use different pages/views for each language, but each page would support multiple languages using satellite assemblies.
You can look at Matt Hawley's blog entry for more explanation and exampl...
How do I show a Save As dialog in WPF?
...FileInfo file = new FileInfo("image.jpg");
var dialog = new System.Windows.Forms.SaveFileDialog();
dialog.FileName = file.Name;
dialog.DefaultExt = file.Extension;
dialog.Filter = string.Format("{0} images ({1})|*{1}|All files (*.*)|*.*",
file.Extension.Substring(1).Capitalize(),
file.Extens...
What is http multipart request?
...e server.
What it looks like
See Multipart Content-Type
See multipart/form-data
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Default value of a type at Runtime [duplicate]
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For information (and because I ran into the problem), System.Void is considered a ValueType, but cause an exception on CreateInstance. If you use this code to get the default return value of a method, you'll need to consider System...