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How to change border color of textarea on :focus
...answered Apr 22 '13 at 21:03
adriftadrift
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SQL join: selecting the last records in a one-to-many relationship
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If you want to include customers who never made a purchase, then change JOIN purchase p1 ON (c.id = p1.customer_id) to LEFT JOIN purchase p1 ON (c.id = p1.customer_id)
– GordonM
Dec 8 '1...
How do you properly determine the current script directory in Python?
...e; normally you should be using the module infrastructure to load scripts. If you must use these methods, I suggest setting __file__ in the globals you pass to the script so it can read that filename.
There's no other way to get the filename in execed code: as you note, the CWD may be in a complete...
Plot two graphs in same plot in R
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How to use the same if x is different? Say, I have x1 and y1 for one graph and add another graph of x2 and y2 in the same graph. Both x1 and x2 have same range but different values.
– Kavipriya
Oct 21 '15 a...
How to loop over directories in Linux?
... directly in the find command. You have only one place, the cd, to change, if you want more actions to take place in this folder)
-maxdepth 1 and -mindepth 1 make sure that find only looks in the current directory and doesn't include . itself in the result
-type d looks only for directories
-printf ...
Hide/Show Column in an HTML Table
...faster than any JS loop approach; for really long tables it can make a significant difference to responsiveness.
If you can get away with not supporting IE6, you could use adjacency selectors to avoid having to add the class attributes to tds. Or alternatively, if your concern is making the markup ...
Define an 's src attribute in CSS [duplicate]
I need to define an 's src attribute in CSS. Is there a way to specify this attribute?
7 Answers
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Could not load file or assembly System.Web.Http.WebHost after published to Azure web site
...ly(System.Web.Http.WebHost) and then do a redeploy, it should work fine.
If you get the similar error i.e. some other assembly missing, then make that assembly to copylocal=true and redeploy, repeat this iteratively - if you are unsure of its dependencies.
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How can I programmatically generate keypress events in C#?
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The question is tagged WPF but the answers so far are specific WinForms and Win32.
To do this in WPF, simply construct a KeyEventArgs and call RaiseEvent on the target. For example, to send an Insert key KeyDown event to the currently focused element:
var key = Key.Insert; ...
App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
...—App 崩了。is a number 块判断输入是否为合法数字，配合 if-else 做一层校验，比事后 try-catch 干净得多。
推荐写法：文本框内容 → is a number → true 时走计算逻辑，false 时弹出提示"请输入有效数字"。
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