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How can I check for an empty/undefined/null string in JavaScript?
... Just to note, if your definition of "empty string" includes whitespace, then this solution is not appropriate. A string of 1 or more spaces returns true above. If you are using JQuery you can simply use this: if ($.trim(ref).length === 0) - as per this answer to a similar question: stackoverflow....
What does “exited with code 9009” mean during this build?
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If I do not have the full path, it runs for a while after a restart, and then stops.
Also as mentioned on the comments to this post, if there are spaces in full path, then one needs quotation marks around the command. E.g.
"C:\The folder with spaces\ABCDEF\xcopy.exe" /Y C:\projectpath\project.c...
What is a software framework? [closed]
... of today. If I told you to cut a piece of paper with dimensions 5m by 5m, then surely you would do that. But suppose I ask you to cut 1000 pieces of paper of the same dimensions. In this case, you won't do the measuring 1000 times; obviously, you would make a frame of 5m by 5m, and then with the he...
Solution to INSTALL_FAILED_INSUFFICIENT_STORAGE error on Android [closed]
...r that:
Right click the root of your Android Project, go to "Run As" and then go to "Run Configurations...". Locate the "Android Application" node in the tree at the left, and then select your project and go to the "Target" tab on the right side of the window look down for the "Additional Emulator...
What are the disadvantages of using persistent connection in PDO
...an block a multitude of tables until the deadlock timer kicks in, and even then, the deadlock timer can kill the newer request instead of the older request that's causing the problem.
If the dead script was in the middle of a transaction, the next script that gets that connection also gets the tran...
What is (functional) reactive programming?
...d illustrations. For papers, start with Functional Reactive Animation and then follow up on links on the publications link on my home page and the FRP link on the Haskell wiki.
Personally, I like to think about what FRP means before addressing how it might be implemented.
(Code without a specifica...
How to make HTML Text unselectable [duplicate]
...t do much for you here as well.
If you're targeting decent browsers only, then just make use of CSS3:
.unselectable {
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
<...
How to shrink/purge ibdata1 file in MySQL
... table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A.
8 Answers
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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if age == 40 and sex =="Male" then
print("男人四十一枝花")
elseif age > 60 and sex ~="Female" then
print("old man without country!")
elseif age < 20 then
io.write("too young, too naive!\n")
else
local age = io.read()
...
How to tell Eclipse Workspace?
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Go Window>Preferences. Then under General>Workspace there is a property: "Workspace name (shown in window title)" and put in some sort of identifying label.
You'll need to set this up for each workspace you have, but it's an easy way to know wh...