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JavaScript before leaving the page
...er if they want to leave the page or not, you cannot redirect them if they select to stay on the page. If they select to leave, the browser will go where they told it to go.
You can use onunload to do stuff before the page is unloaded, but you cannot redirect from there (Chrome 14+ blocks alerts ...
jQuery AJAX file upload PHP
...t type="file" onchange="saveFile(this)" >
<br><br>
Before selecting the file Open chrome console > network tab to see the request details.
<br><br>
<small>Because in this example we send request to https://stacksnippets.net/upload/image the response code will ...
How to start nginx via different port(other than 80)
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You have to go to the /etc/nginx/sites-enabled/ and if this is the default configuration, then there should be a file by name: default.
Edit that file by defining your desired port; in the snippet below, we are serving the Nginx instance on port 81.
server {
listen 8...
How to Correctly Use Lists in R?
...dresses the question of the difference between [] and [[]].
In short [[]] selects a single item from a list and [] returns a list of the selected items. In your example, x = list(1, 2, 3, 4)' item 1 is a single integer but x[[1]] returns a single 1 and x[1] returns a list with only one value.
>...
How to explain callbacks in plain english? How are they different from calling one function from ano
How to explain callbacks in plain English? How are they different from calling one function from another function taking some context from the calling function? How can their power be explained to a novice programmer?
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Is there a ternary conditional operator in T-SQL?
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Use case:
select *
from table
where isExternal = case @type when 2 then 1 else 0 end
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How to iterate over values of an Enum having flags?
... .Split(new[] { ", " }, StringSplitOptions.None)
.Select(v => (Items)Enum.Parse(typeof(Items), v));
// This method will always end up with the most applicable values
value = Items.Bar | Items.Baz;
values = value.ToString()
.Split(new[] { ", " }, StringSplit...
Link and execute external JavaScript file hosted on GitHub
...ttp://www.requestly.in
Go to Rules Page
Click on Add Icon to create a rule
Select Modify Headers
Give a Name and Descripton
Select Remove -> Response -> X-Content-Type-Options
In Source field, enter Url -> Contains -> raw.githubusercontent.com
Solution 2: Use Replace host Rule
Instal...
json_encode is returning NULL?
...tf8 encoding: try to put mysql_query('SET CHARACTER SET utf8') before your SELECT query.
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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
I want to slice a NumPy nxn array. I want to extract an arbitrary selection of m rows and columns of that array (i.e. without any pattern in the numbers of rows/columns), making it a new, mxm array. For this example let us say the array is 4x4 and I want to extract a 2x2 array from it.
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