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javascript set a variable if undefined
I know that I can test for a javascript variable and then define it if it is undefined, but is there not some way of saying
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Can you have multiple $(document).ready(function(){ … }); sections?
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You can have multiple ones, but it's not always the neatest thing to do. Try not to overuse them, as it will seriously affect readability. Other than that , it's perfectly legal. See the below:
http://www.learningjquery.com/2006/09/multiple-document-ready
Try this out:
$(docum...
Executing a command stored in a variable from PowerShell
...the system path.
$cmd = '7z.exe'
$prm = 'a', '-tzip', 'c:\temp\with space\test1.zip', 'C:\TEMP\with space\changelog'
& $cmd $prm
If the command is known (7z.exe) and only parameters are variable then this will do
$prm = 'a', '-tzip', 'c:\temp\with space\test1.zip', 'C:\TEMP\with space\chang...
XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
...nd then included the data in the html like normal javascript:
<div id="test"></div>
<script src="base64_data.js"></script>
<script>
data = atob(base64_data);
var sqldb = new SQL.Database(data);
// Database test code from the sql.js project
var test = s...
How does git compute file hashes?
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@osgx There is. The reference and my testing confirms so. I've corrected the answer. Size seems to be number of bytes as integer with no prefix.
– Samuel Harmer
May 14 '17 at 12:15
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How do I get the different parts of a Flask request's url?
...nother example:
request:
curl -XGET http://127.0.0.1:5000/alert/dingding/test?x=y
then:
request.method: GET
request.url: http://127.0.0.1:5000/alert/dingding/test?x=y
request.base_url: http://127.0.0.1:5000/alert/dingding/test
request.url_charset: ...
How to convert SecureString to System.String?
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@radbyx In a quick and dirty test setup, I can call it 1000 times in 76ms. The first invocation takes 0.3 ms and subsequent invocations ~0.07ms. How large is your secure string and which version of the framework are you using?
– Ras...
Null coalescing in powershell
...t a variable is defined first. If you set $myval = $null before doing the test, the error should go away.
– StephenD
Jul 4 '19 at 8:06
1
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Determine if Python is running inside virtualenv
...at() != sys.prefix
If you only care about supported Python versions and latest virtualenv, you can replace get_base_prefix_compat() with simply sys.base_prefix.
Using the VIRTUAL_ENV environment variable is not reliable. It is set by the virtualenv activate shell script, but a virtualenv can be use...
Find size of object instance in bytes in c#
... Marshal.ReadInt32(type.TypeHandle.Value, 4) works for x86 and x64. I only tested struct and class types. Keep in mind that this returns the boxed size for value types. @Pavel Maybe you could update your answer.
– jnm2
Mar 1 '15 at 1:52
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