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How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?
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In "Elements" panel, press Ctrl+F
In the search box, type in XPath or CSS Selector, if elements are found, they will be highlighted in yellow.
Firefox (since version 75)
Since FF 75 it's possible to use raw xpath query without evaluation xpath expressions, see documentation for more info.
Fir...
How to reset Django admin password?
...users use the command "print(users)"
The first user is usually the admin.
Select the user you wish to change their password e.g.
"user = users[0]"
Set the password
user.set_password('name_of_the_new_password_for_user_selected')
Save the new password
"user.save()"
Start the server and log in usi...
How to support UTF-8 encoding in Eclipse
...click Workspace, text file encoding (near bottom) has an encoding chooser.
Select "Other" radio button -> Select UTF-8 from the drop down
Click Apply and OK button OR click simply OK button
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Unique (non-repeating) random numbers in O(1)?
... max
At each iteration, a random number r is selected between 0 and max, array[r] and array[max] are swapped, the new array[max] is returned, and max is decremented:
max = 10, r = 3
+--------------------+
v v
+--+--+--+--+--+--+...
Embedded MongoDB when running integration tests
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mailto link with HTML body
... With Apple Mail (11.2), once you have opened the .eml file, you can select Message / Send Again from the menu (shift-cmd-D) to put the email in edit mode.
– Jeff Collier
Mar 12 '18 at 22:25
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Capture characters from standard input without waiting for enter to be pressed
...ns that you can use to switch off line buffering (I believe that's called "raw mode", as opposed to "cooked mode" - look into man stty). Curses would handle that for you in a portable manner, if I'm not mistaken.
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Local file access with JavaScript
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If the user selects a file via <input type="file">, you can read and process that file using the File API.
Reading or writing arbitrary files is not allowed by design. It's a violation of the sandbox. From Wikipedia -> Javascri...
How to fix “Headers already sent” error in PHP
...eader / header_remove
session_start / session_regenerate_id
setcookie / setrawcookie
Output can be:
Unintentional:
Whitespace before <?php or after ?>
The UTF-8 Byte Order Mark specifically
Previous error messages or notices
Intentional:
print, echo and other functions producing ...
How to map a composite key with JPA and Hibernate?
... way you write queries (making them more or less verbose):
with IdClass
select t.levelStation from Time t
with EmbeddedId
select t.timePK.levelStation from Time t
References
JPA 1.0 specification
Section 2.1.4 "Primary Keys and Entity Identity"
Section 9.1.14 "EmbeddedId Annotation"
Sect...