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How to avoid isset() and empty()
I have several older applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts.
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Linq: adding conditions to the where clause conditionally
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If you do not call ToList() and your final mapping to the DTO type, you can add Where clauses as you go, and build the results at the end:
var query = from u in DataContext.Users
where u.Division == strUserDiv
&& u.Age > 18
&&a...
Appending HTML string to the DOM
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@alex It's the same concept: parsing a HTML string and putting it into the DOM. But the functionality is different - innerHTML puts the string into the element (replacing all children), whereas insertAdjacentHTML puts it (1) before the element, (2) after the element, (3) insi...
How can I install pip on Windows?
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Python 2.7.9+ and 3.4+
Good news! Python 3.4 (released March 2014) and Python 2.7.9 (released December 2014) ship with Pip. This is the best feature of any Python release. It makes the community's wealth of libraries accessible to everyon...
Bootstrap control with multiple “data-toggle”
... "data-toggle".
For example, lets say I want a button that has a "tooltip" and a "button" toggle assigned
to it.
Tried data-toggle="tooltip button", but only the tooltip worked.
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Is it possible to solve the “A generic array of T is created for a varargs parameter” compiler warni
...uestion, one generic class uses another class with generic type parameters and needs to pass one of the generic types to a method with varargs parameters:
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C++ : why bool is 8 bits long?
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Yes, it's a hardware choice, and if the hardware allows for it, the size of a bool could change. But the OP asked why a bool is 8 bits wide, and on systems where that is the case, it is generally because the CPU is only able to address 8-bit bytes.
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How do you avoid over-populating the PATH Environment Variable in Windows?
...ur system. For example I have almost everything accessible through the command line, but now I come to the limit of the path string, so i can't add any more dir.
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Convert an image to grayscale in HTML/CSS
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Support for CSS filters has landed in Webkit. So we now have a cross-browser solution.
img {
filter: gray; /* IE6-9 */
-webkit-filter: grayscale(1); /* Google Chrome, Safari 6+ & Opera 15+ */
filter: grayscale(1); /* Microsoft Edge and...
How to know user has clicked “X” or the “Close” button?
... get it through the sender object. Try to cast sender as a Button control, and verify perhaps for its name "CloseButton", for instance.
private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
if (string.Equals((sender as Button).Name, @"CloseButton"))
// Do something pro...