Some Of The Best Answers From Latest Asked Questions
How do I display Ruby on Rails form validation error messages one at a time?
A better idea,
if you want to put the error message just beneath the text field, you can do like this
.row.spacer20top
.col-sm-6.form-group
= f.label :first_name, "*Your First Name:"
= f.text_field :first_name, :required => true, class: "form-control"
= f.error_message_for(:first_name)
What is error_message_for?
--> Well, this is a beautiful hack to do some cool stuff
# Author Shiva Bhusal
# Aug 2016
# in config/initializers/modify_rails_form_builder.rb
# This will add a new method in the `f` object available in Rails forms
class ActionView::Helpers::FormBuilder
def error_message_for(field_name)
if self.object.errors[field_name].present?
model_name = self.object.class.name.downcase
id_of_element = "error_#{model_name}_#{field_name}"
target_elem_id = "#{model_name}_#{field_name}"
class_name = 'signup-error alert alert-danger'
error_declaration_class = 'has-signup-error'
"<div id=\"#{id_of_element}\" for=\"#{target_elem_id}\" class=\"#{class_name}\">"\
"#{self.object.errors[field_name].join(', ')}"\
"</div>"\
"<!-- Later JavaScript to add class to the parent element -->"\
"<script>"\
"document.onreadystatechange = function(){"\
"$('##{id_of_element}').parent()"\
".addClass('#{error_declaration_class}');"\
"}"\
"</script>".html_safe
end
rescue
nil
end
end
Result
Markup Generated after error
<div id="error_user_email" for="user_email" class="signup-error alert alert-danger">has already been taken</div>
<script>document.onreadystatechange = function(){$('#error_user_email').parent().addClass('has-signup-error');}</script>
Corresponding SCSS
.has-signup-error{
.signup-error{
background: transparent;
color: $brand-danger;
border: none;
}
input, select{
background-color: $bg-danger;
border-color: $brand-danger;
color: $gray-base;
font-weight: 500;
}
&.checkbox{
label{
&:before{
background-color: $bg-danger;
border-color: $brand-danger;
}
}
}
Note: Bootstrap variables used here
Translating touch events from Javascript to jQuery
$(window).on("touchstart", function(ev) {
var e = ev.originalEvent;
console.log(e.touches);
});
I know it been asked a long time ago, but I thought a concrete example might help.
Generate random int value from 3 to 6
I see you have added an answer to your question in SQL Server 2008 you can also do
SELECT 3 + CRYPT_GEN_RANDOM(1) % 4 /*Random number between 3 and 6*/
FROM ...
A couple of disadvantages of this method are
- This is slower than the
NEWID()method - Even though it is evaluated once per row the query optimiser does not realise this which can lead to odd results.
but just thought I'd add it as another option.
How do I disable "missing docstring" warnings at a file-level in Pylint?
Ctrl + Shift + P
Then type and click on > preferences:configure language specific settings
and then type "python" after that. Paste the code
{ "python.linting.pylintArgs": [ "--load-plugins=pylint_django", "--errors-only" ], }
php $_GET and undefined index
I was having the same problem in localhost with xampp. Now I'm using this combination of parameters:
// Report all errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);
php.net: http://php.net/manual/pt_BR/function.error-reporting.php
Enabling WiFi on Android Emulator
When using an AVD with API level 25 or higher, the emulator provides a simulated Wi-Fi access point ("AndroidWifi"), and Android automatically connects to it.
Source : https://developer.android.com/studio/run/emulator.html#wi-fi
Using :focus to style outer div?
You can tab between div tags. Just add a tab index to the div. It's best to use jQuery and CSS classes to solve this problem. Here's a working sample tested in IE, Firefox, and Chrome (Latest versions... didn't test older).
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
var divParentIdFocus;
var divParentIdUnfocus = null;
$(document).ready(function() {
$("div").focus(function() {
//$(this).attr("class", "highlight");
var curDivId = $(this).attr("id");
// This Check needs to be performed when/if div regains focus
// from child element.
if (divParentIdFocus != curDivId){
divParentIdUnfocus = divParentIdFocus;
divParentIdFocus = curDivId;
refreshHighlight();
}
divParentIdFocus = curDivId;
});
$("textarea").focus(function(){
var curDivId = $(this).closest("div").attr("id");
if(divParentIdFocus != curDivId){
divParentIdUnfocus = divParentIdFocus;
divParentIdFocus = curDivId;
refreshHighlight();
}
});
$("#div1").focus();
});
function refreshHighlight()
{
if(divParentIdUnfocus != null){
$("#" +divParentIdUnfocus).attr("class", "noHighlight");
divParentIdUnfocus = null;
}
$("#" + divParentIdFocus).attr("class", "highlight");
}
</script>
<style type="text/css">
.highlight{
background-color:blue;
border: 3px solid black;
font-weight:bold;
color: white;
}
.noHighlight{
}
div, h1,textarea, select { outline: none; }
</style>
<head>
<body>
<div id = "div1" tabindex="100">
<h1>Div 1</h1> <br />
<textarea rows="2" cols="25" tabindex="101">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="102">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="103">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="104">~Your Text Here~</textarea> <br />
</div>
<div id = "div2" tabindex="200">
<h1>Div 2</h1> <br />
<textarea rows="2" cols="25" tabindex="201">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="202">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="203">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="204">~Your Text Here~</textarea> <br />
</div>
<div id = "div3" tabindex="300">
<h1>Div 3</h1> <br />
<textarea rows="2" cols="25" tabindex="301">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="302">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="303">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="304">~Your Text Here~</textarea> <br />
</div>
<div id = "div4" tabindex="400">
<h1>Div 4</h1> <br />
<textarea rows="2" cols="25" tabindex="401">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="402">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="403">~Your Text Here~</textarea> <br />
<textarea rows="2" cols="25" tabindex="404">~Your Text Here~</textarea> <br />
</div>
</body>
</html>
Select value from list of tuples where condition
Yes, you can use filter if you know at which position in the tuple the desired column resides. If the case is that the id is the first element of the tuple then you can filter the list like so:
filter(lambda t: t[0]==10, mylist)
This will return the list of corresponding tuples. If you want the age, just pick the element you want. Instead of filter you could also use list comprehension and pick the element in the first go. You could even unpack it right away (if there is only one result):
[age] = [t[1] for t in mylist if t[0]==10]
But I would strongly recommend to use dictionaries or named tuples for this purpose.
Importing Excel spreadsheet data into another Excel spreadsheet containing VBA
This should get you started: Using VBA in your own Excel workbook, have it prompt the user for the filename of their data file, then just copy that fixed range into your target workbook (that could be either the same workbook as your macro enabled one, or a third workbook). Here's a quick vba example of how that works:
' Get customer workbook...
Dim customerBook As Workbook
Dim filter As String
Dim caption As String
Dim customerFilename As String
Dim customerWorkbook As Workbook
Dim targetWorkbook As Workbook
' make weak assumption that active workbook is the target
Set targetWorkbook = Application.ActiveWorkbook
' get the customer workbook
filter = "Text files (*.xlsx),*.xlsx"
caption = "Please Select an input file "
customerFilename = Application.GetOpenFilename(filter, , caption)
Set customerWorkbook = Application.Workbooks.Open(customerFilename)
' assume range is A1 - C10 in sheet1
' copy data from customer to target workbook
Dim targetSheet As Worksheet
Set targetSheet = targetWorkbook.Worksheets(1)
Dim sourceSheet As Worksheet
Set sourceSheet = customerWorkbook.Worksheets(1)
targetSheet.Range("A1", "C10").Value = sourceSheet.Range("A1", "C10").Value
' Close customer workbook
customerWorkbook.Close
How to write multiple line string using Bash with variables?
I'm using Mac OS and to write multiple lines in a SH Script following code worked for me
#! /bin/bash
FILE_NAME="SomeRandomFile"
touch $FILE_NAME
echo """I wrote all
the
stuff
here.
And to access a variable we can use
$FILE_NAME
""" >> $FILE_NAME
cat $FILE_NAME
Please don't forget to assign chmod as required to the script file. I have used
chmod u+x myScriptFile.sh
How do I get the AM/PM value from a DateTime?
I know this might seem to be extremely late.. however it may help someone out there
I wanted to get the AM PM part of the date, so I used what Andy advised:
dateTime.ToString("tt");
I used that part to construct a Path to save my files.. I built my assumptions that I will get either AM or PM and nothing else !!
however when I used a PC that its culture is not English ..( in my case ARABIC) .. my application failed becase the format "tt" returned something new not AM nor PM (? or ?)..
So the fix to this was to ignore the culture by adding the second argument as follow:
dateTime.ToString("tt", CultureInfo.InvariantCulture);
.. of course u have to add : using System.Globalization; on top of ur file I hope that will help someone :)
Updating the value of data attribute using jQuery
$('.toggle img').each(function(index) {
if($(this).attr('data-id') == '4')
{
$(this).attr('data-block', 'something');
$(this).attr('src', 'something.jpg');
}
});
or
$('.toggle img[data-id="4"]').attr('data-block', 'something');
$('.toggle img[data-id="4"]').attr('src', 'something.jpg');
One line if-condition-assignment
In one line:
if someBoolValue: num1 = 20
But don’t do that. This style is normally not expected. People prefer the longer form for clarity and consistency.
if someBoolValue:
num1 = 20
(Equally, camel caps should be avoided. So rather use some_bool_value.)
Note that an in-line expression some_value if predicate without an else part does not exist because there would not be a return value if the predicate were false. However, expressions must have a clearly defined return value in all cases. This is different from usage as in, say, Ruby or Perl.
Annotation @Transactional. How to rollback?
Just throw any RuntimeException from a method marked as @Transactional.
By default all RuntimeExceptions rollback transaction whereas checked exceptions don't. This is an EJB legacy. You can configure this by using rollbackFor() and noRollbackFor() annotation parameters:
@Transactional(rollbackFor=Exception.class)
This will rollback transaction after throwing any exception.
Python main call within class
Remember, you are NOT allowed to do this.
class foo():
def print_hello(self):
print("Hello") # This next line will produce an ERROR!
self.print_hello() # <---- it calls a class function, inside a class,
# but outside a class function. Not allowed.
You must call a class function from either outside the class, or from within a function in that class.
Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;
[Solved for me]
by removing the duplicate library "JAR file" then remove BuildConfig.java file, Clean project and its work.
Difference between a theta join, equijoin and natural join
Natural Join: Natural join can be possible when there is at least one common attribute in two relations.
Theta Join: Theta join can be possible when two act on particular condition.
Equi Join: Equi can be possible when two act on equity condition. It is one type of theta join.
Java math function to convert positive int to negative and negative to positive?
The easiest thing to do is 0- the value
for instance if int i = 5;
0-i would give you -5
and if i was -6;
0- i would give you 6
Getting "NoSuchMethodError: org.hamcrest.Matcher.describeMismatch" when running test in IntelliJ 10.5
This worked for me. No need to exclude anything. I just used mockito-core instead mockito-all
testCompile 'junit:junit:4.12'
testCompile group: 'org.mockito', name: 'mockito-core', version: '3.0.0'
testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '2.1'
How to do an update + join in PostgreSQL?
For those actually wanting to do a JOIN you can also use:
UPDATE a
SET price = b_alias.unit_price
FROM a AS a_alias
LEFT JOIN b AS b_alias ON a_alias.b_fk = b_alias.id
WHERE a_alias.unit_name LIKE 'some_value'
AND a.id = a_alias.id;
You can use the a_alias in the SET section on the right of the equals sign if needed.
The fields on the left of the equals sign don't require a table reference as they are deemed to be from the original "a" table.
Facebook Open Graph Error - Inferred Property
It might help some people who are struggling to get Facebook to read Open Graph nicely...
Have a look at the source code that is generated by browser using Firefox, Chrome or another desktop browser (many mobiles won't do view source) and make sure there is no blank lines before the doctype line or head tag... If there is Facebook will have a complete tantrum and throw it's toys out of the pram! (Best description!) Remove Blank Line - happy Facebook... took me about 1.5 - 2 hours to spot this!
Import a custom class in Java
If all of your classes are in the same package, you shouldn't need to import them.
Simply instantiate the object like so:
CustomObject myObject = new CustomObject();
Read file line by line using ifstream in C++
Expanding on the accepted answer, if the input is:
1,NYC
2,ABQ
...
you will still be able to apply the same logic, like this:
#include <fstream>
std::ifstream infile("thefile.txt");
if (infile.is_open()) {
int number;
std::string str;
char c;
while (infile >> number >> c >> str && c == ',')
std::cout << number << " " << str << "\n";
}
infile.close();
How to select a drop-down menu value with Selenium using Python?
You don't have to click anything. Use find by xpath or whatever you choose and then use send keys
For your example: HTML:
<select id="fruits01" class="select" name="fruits">
<option value="0">Choose your fruits:</option>
<option value="1">Banana</option>
<option value="2">Mango</option>
</select>
Python:
fruit_field = browser.find_element_by_xpath("//input[@name='fruits']")
fruit_field.send_keys("Mango")
That's it.
Checking if a string array contains a value, and if so, getting its position
string x ="Hi ,World";
string y = x;
char[] whitespace = new char[]{ ' ',\t'};
string[] fooArray = y.Split(whitespace); // now you have an array of 3 strings
y = String.Join(" ", fooArray);
string[] target = { "Hi", "World", "VW_Slep" };
for (int i = 0; i < target.Length; i++)
{
string v = target[i];
string results = Array.Find(fooArray, element => element.StartsWith(v, StringComparison.Ordinal));
//
if (results != null)
{ MessageBox.Show(results); }
}
How to match letters only using java regex, matches method?
[A-Za-z ]* to match letters and spaces.
Access non-numeric Object properties by index?
The only way I can think of doing this is by creating a method that gives you the property using Object.keys();.
var obj = {
dog: "woof",
cat: "meow",
key: function(n) {
return this[Object.keys(this)[n]];
}
};
obj.key(1); // "meow"
Demo: http://jsfiddle.net/UmkVn/
It would be possible to extend this to all objects using Object.prototype; but that isn't usually recommended.
Instead, use a function helper:
var object = {
key: function(n) {
return this[ Object.keys(this)[n] ];
}
};
function key(obj, idx) {
return object.key.call(obj, idx);
}
key({ a: 6 }, 0); // 6
Open another page in php
Use the following code:
if(processing == success) {
header("Location:filename");
exit();
}
And you are good to go.
How do I create the small icon next to the website tab for my site?
It is called favicon.ico and you can generate it from this site.
Google maps Places API V3 autocomplete - select first option on enter
Here is a solution that does not make a geocoding request that may return an incorrect result: http://jsfiddle.net/amirnissim/2D6HW/
It simulates a down-arrow keypress whenever the user hits return inside the autocomplete field. The ? event is triggered before the return event so it simulates the user selecting the first suggestion using the keyboard.
Here is the code (tested on Chrome and Firefox) :
<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js'></script>
<script src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"></script>
<script>
var pac_input = document.getElementById('searchTextField');
(function pacSelectFirst(input) {
// store the original event binding function
var _addEventListener = (input.addEventListener) ? input.addEventListener : input.attachEvent;
function addEventListenerWrapper(type, listener) {
// Simulate a 'down arrow' keypress on hitting 'return' when no pac suggestion is selected,
// and then trigger the original listener.
if (type == "keydown") {
var orig_listener = listener;
listener = function(event) {
var suggestion_selected = $(".pac-item-selected").length > 0;
if (event.which == 13 && !suggestion_selected) {
var simulated_downarrow = $.Event("keydown", {
keyCode: 40,
which: 40
});
orig_listener.apply(input, [simulated_downarrow]);
}
orig_listener.apply(input, [event]);
};
}
_addEventListener.apply(input, [type, listener]);
}
input.addEventListener = addEventListenerWrapper;
input.attachEvent = addEventListenerWrapper;
var autocomplete = new google.maps.places.Autocomplete(input);
})(pac_input);
</script>
How to find the socket buffer size of linux
If you want see your buffer size in terminal, you can take a look at:
/proc/sys/net/ipv4/tcp_rmem(for read)/proc/sys/net/ipv4/tcp_wmem(for write)
They contain three numbers, which are minimum, default and maximum memory size values (in byte), respectively.
Regular expression for number with length of 4, 5 or 6
Be aware that, as written, Peter's solution will "accept" 0000. If you want to validate numbers between 1000 and 999999, then that is another problem :-)
^[1-9][0-9]{3,5}$
for example will block inserting 0 at the beginning of the string.
If you want to accept 0 padding, but only up to a lengh of 6, so that 001000 is valid, then it becomes more complex. If we use look-ahead then we can write something like
^(?=[0-9]{4,6}$)0*[1-9][0-9]{3,}$
This first checks if the string is long 4-6 (?=[0-9]{4,6}$), then skips the 0s 0*and search for a non-zero [1-9] followed by at least 3 digits [0-9]{3,}.
background-size in shorthand background property (CSS3)
Just a note for reference: I was trying to do shorthand like so:
background: url('../images/sprite.png') -312px -234px / 355px auto no-repeat;
but iPhone Safari browsers weren't showing the image properly with a fixed position element. I didn't check with a non-fixed, because I'm lazy. I had to switch the css to what's below, being careful to put background-size after the background property. If you do them in reverse, the background reverts the background-size to the original size of the image. So generally I would avoid using the shorthand to set background-size.
background: url('../images/sprite.png') -312px -234px no-repeat;
background-size: 355px auto;
How to pass prepareForSegue: an object
I've implemented a library with a category on UIViewController that simplifies this operation. Basically, you set the parameters you want to pass over in a NSDictionary associated to the UI item that is performing the segue. It works with manual segues too.
For example, you can do
[self performSegueWithIdentifier:@"yourIdentifier" parameters:@{@"customParam1":customValue1, @"customValue2":customValue2}];
for a manual segue or create a button with a segue and use
[button setSegueParameters:@{@"customParam1":customValue1, @"customValue2":customValue2}];
If destination view controller is not key-value coding compliant for a key, nothing happens. It works with key-values too (useful for unwind segues). Check it out here https://github.com/stefanomondino/SMQuickSegue
Cannot connect to Database server (mysql workbench)
Forr me reason was that I tried to use newest MySQL Workbench 8.x to connect to MySQL Server 5.1 (both running on Windows Server 2012).
When I uninstalled MySQL Workbench 8.x and installed MySQL Workbench 6.3.10 it successfully connected to localhost database
Rails and PostgreSQL: Role postgres does not exist
I met this issue right on when I first install the Heroku's POSTGRES.app thing. After one morning trial and error i think this one line of code solved problem. As describe earlier, this is because postgresql does not have default role the first time it is set up. And we need to set that.
sovanlandy=# CREATE ROLE postgres LOGIN;
You must log in to your respective psql console to use this psql command.
Also noted that, if you already created the role 'postgre' but still get permission errors, you need to alter with command:
sovanlandy=# ALTER ROLE postgres LOGIN;
Hope it helps!
Conversion of Char to Binary in C
We show up two functions that prints a SINGLE character to binary.
void printbinchar(char character)
{
char output[9];
itoa(character, output, 2);
printf("%s\n", output);
}
printbinchar(10) will write into the console
1010
itoa is a library function that converts a single integer value to a string with the specified base. For example... itoa(1341, output, 10) will write in output string "1341". And of course itoa(9, output, 2) will write in the output string "1001".
The next function will print into the standard output the full binary representation of a character, that is, it will print all 8 bits, also if the higher bits are zero.
void printbincharpad(char c)
{
for (int i = 7; i >= 0; --i)
{
putchar( (c & (1 << i)) ? '1' : '0' );
}
putchar('\n');
}
printbincharpad(10) will write into the console
00001010
Now i present a function that prints out an entire string (without last null character).
void printstringasbinary(char* s)
{
// A small 9 characters buffer we use to perform the conversion
char output[9];
// Until the first character pointed by s is not a null character
// that indicates end of string...
while (*s)
{
// Convert the first character of the string to binary using itoa.
// Characters in c are just 8 bit integers, at least, in noawdays computers.
itoa(*s, output, 2);
// print out our string and let's write a new line.
puts(output);
// we advance our string by one character,
// If our original string was "ABC" now we are pointing at "BC".
++s;
}
}
Consider however that itoa don't adds padding zeroes, so printstringasbinary("AB1") will print something like:
1000001
1000010
110001
Twitter Bootstrap Tabs: Go to Specific Tab on Page Reload or Hyperlink
I know this thread is very old, but I'll leave here my own implementation:
$(function () {
// some initialization code
addTabBehavior()
})
// Initialize events and change tab on first page load.
function addTabBehavior() {
$('.nav-tabs a').on('show.bs.tab', e => {
window.location.hash = e.target.hash.replace('nav-', '')
})
$(window).on('popstate', e => {
changeTab()
})
changeTab()
}
// Change the current tab and URL hash; if don't have any hash
// in URL, so activate the first tab and update the URL hash.
function changeTab() {
const hash = getUrlHash()
if (hash) {
$(`.nav-tabs a[href="#nav-${hash}"]`).tab('show')
} else {
$('.nav-tabs a').first().tab('show')
}
}
// Get the hash from URL. Ex: www.example.com/#tab1
function getUrlHash() {
return window.location.hash.slice(1)
}
Note that I'm using a nav- class prefix to nav links.
How to convert upper case letters to lower case
You can find more methods and functions related to Python strings in section 5.6.1. String Methods of the documentation.
w.strip(',.').lower()
generate model using user:references vs user_id:integer
For the former, convention over configuration. Rails default when you reference another table with
belongs_to :something
is to look for something_id.
references, or belongs_to is actually newer way of writing the former with few quirks.
Important is to remember that it will not create foreign keys for you. In order to do that, you need to set it up explicitly using either:
t.references :something, foreign_key: true
t.belongs_to :something_else, foreign_key: true
or (note the plural):
add_foreign_key :table_name, :somethings
add_foreign_key :table_name, :something_elses`
Python Selenium accessing HTML source
You can simply use the WebDriver object, and access to the page source code via its @property field page_source...
Try this code snippet :-)
from selenium import webdriver
driver = webdriver.Firefox('path/to/executable')
driver.get('https://some-domain.com')
source = driver.page_source
if 'stuff' in source:
print('found...')
else:
print('not in source...')
Animate an element's width from 0 to 100%, with it and it's wrapper being only as wide as they need to be, without a pre-set width, in CSS3 or jQuery
a late answer, but I think this one works as required in the question :)
this one uses z-index and position absolute, and avoid the issue that the container element width doesn't grow in transition.
You can tweak the text's margin and padding to suit your needs, and "+" can be changed to font awesome icons if needed.
body {
font-size: 16px;
}
.container {
height: 2.5rem;
position: relative;
width: auto;
display: inline-flex;
align-items: center;
}
.add {
font-size: 1.5rem;
color: #fff;
cursor: pointer;
font-size: 1.5rem;
background: #2794A5;
border-radius: 20px;
height: 100%;
width: 2.5rem;
display: flex;
justify-content: center;
align-items: center;
position: absolute;
z-index: 2;
}
.text {
white-space: nowrap;
position: relative;
z-index: 1;
height: 100%;
width: 0;
color: #fff;
overflow: hidden;
transition: 0.3s all ease;
background: #2794A5;
height: 100%;
display: flex;
align-items: center;
border-top-right-radius: 20px;
border-bottom-right-radius: 20px;
margin-left: 20px;
padding-left: 20px;
cursor: pointer;
}
.container:hover .text {
width: 100%;
padding-right: 20px;
}<div class="container">
<span class="add">+</span>
<span class="text">Add new client</span>
</div>Strange Characters in database text: Ã, Ã, ¢, â‚ €,
If the charset of the tables is the same as it's content try to use mysql_set_charset('UTF8', $link_identifier). Note that MySQL uses UTF8 to specify the UTF-8 encoding instead of UTF-8 which is more common.
Check my other answer on a similar question too.
Loop and get key/value pair for JSON array using jQuery
You can get the values directly in case of one array like this:
var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"[email protected]","Phone":"123 dead drive"}';
var result = $.parseJSON(resultJSON);
result['FirstName']; // return 'John'
result['LastName']; // return ''Doe'
result['Email']; // return '[email protected]'
result['Phone']; // return '123'
Sorting hashmap based on keys
Using the TreeMap you can sort the Map.
Map<String, String> map = new HashMap<String, String>();
Map<String, String> treeMap = new TreeMap<String, String>(map);
//show hashmap after the sort
for (String str : treeMap.keySet()) {
System.out.println(str);
}
Git - fatal: Unable to create '/path/my_project/.git/index.lock': File exists
I tried it with many methods several times but this one worked for me (I used PyCharm's terminal) :
$ cd .git/
$ rm -f index.lock
Then I tried again to create an empty git repo :
$ git init
$ git add .
$ git commit -m "commit msg"
How I can get and use the header file <graphics.h> in my C++ program?
<graphics.h> is not a standard header. Most commonly it refers to the header for Borland's BGI API for DOS and is antiquated at best.
However it is nicely simple; there is a Win32 implementation of the BGI interface called WinBGIm. It is implemented using Win32 GDI calls - the lowest level Windows graphics interface. As it is provided as source code, it is perhaps a simple way of understanding how GDI works.
WinBGIm however is by no means cross-platform. If all you want are simple graphics primitives, most of the higher level GUI libraries such as wxWidgets and Qt support that too. There are simpler libraries suggested in the possible duplicate answers mentioned in the comments.
How do I use CMake?
Regarding CMake 3.13.3, platform Windows, and IDE Visual Studio 2017, I suggest this guide. In brief I suggest:
1. Download cmake > unzip it > execute it.
2. As example download GLFW > unzip it > create inside folder Build.
3. In cmake Browse "Source" > Browse "Build" > Configure and Generate.
4. In Visual Studio 2017 Build your Solution.
5. Get the binaries.
Regards.
Why are my CSS3 media queries not working on mobile devices?
Well, in my case, the px after the width value was missing ... Interestingly, the W3C validator did not even notice this error, just silently ignored the definition.
how to add values to an array of objects dynamically in javascript?
In Year 2019, we can use Javascript's ES6 Spread syntax to do it concisely and efficiently
data = [...data, {"label": 2, "value": 13}]
Examples
var data = [_x000D_
{"label" : "1", "value" : 12},_x000D_
{"label" : "1", "value" : 12},_x000D_
{"label" : "1", "value" : 12},_x000D_
];_x000D_
_x000D_
data = [...data, {"label" : "2", "value" : 14}] _x000D_
console.log(data)For your case (i know it was in 2011), we can do it with map() & forEach() like below
var lab = ["1","2","3","4"];_x000D_
var val = [42,55,51,22];_x000D_
_x000D_
//Using forEach()_x000D_
var data = [];_x000D_
val.forEach((v,i) => _x000D_
data= [...data, {"label": lab[i], "value":v}]_x000D_
)_x000D_
_x000D_
//Using map()_x000D_
var dataMap = val.map((v,i) => _x000D_
({"label": lab[i], "value":v})_x000D_
)_x000D_
_x000D_
console.log('data: ', data);_x000D_
console.log('dataMap : ', dataMap);MySQL case sensitive query
MySQL queries are not case-sensitive by default. Following is a simple query that is looking for 'value'. However it will return 'VALUE', 'value', 'VaLuE', etc…
SELECT * FROM `table` WHERE `column` = 'value'
The good news is that if you need to make a case-sensitive query, it is very easy to do using the BINARY operator, which forces a byte by byte comparison:
SELECT * FROM `table` WHERE BINARY `column` = 'value'
How to convert JSON to a Ruby hash
What about the following snippet?
require 'json'
value = '{"val":"test","val1":"test1","val2":"test2"}'
puts JSON.parse(value) # => {"val"=>"test","val1"=>"test1","val2"=>"test2"}
Extracting the last n characters from a string in R
A little modification on @Andrie solution gives also the complement:
substrR <- function(x, n) {
if(n > 0) substr(x, (nchar(x)-n+1), nchar(x)) else substr(x, 1, (nchar(x)+n))
}
x <- "moSvmC20F.5.rda"
substrR(x,-4)
[1] "moSvmC20F.5"
That was what I was looking for. And it invites to the left side:
substrL <- function(x, n){
if(n > 0) substr(x, 1, n) else substr(x, -n+1, nchar(x))
}
substrL(substrR(x,-4),-2)
[1] "SvmC20F.5"
Assign a variable inside a Block to a variable outside a Block
Try __weak if you get any warning regarding retain cycle else use __block
Person *strongPerson = [Person new];
__weak Person *weakPerson = person;
Now you can refer weakPerson object inside block.
jQuery Clone table row
Try this.
HTML
<!-- Your table -->
<table width="100%" border="0" cellspacing="0" cellpadding="0" id="table-data">
<thead>
<tr>
<th>Name</th>
<th>Location</th>
<th>From</th>
<th>To</th>
<th>Add</th>
</tr>
</thead>
<tbody>
<tr>
<td><input type="text" autofocus placeholder="who" name="who" ></td>
<td><input type="text" autofocus placeholder="location" name="location" ></td>
<td><input type="text" placeholder="Start Date" name="datepicker_start" class="datepicker"></td>
<td><input type="text" placeholder="End Date" name="datepicker_end" class="datepicker"></td>
<td><input type="button" name="add" value="Add" class="tr_clone_add"></td>
</tr>
<tbody>
</table>
<!-- Model of new row -->
<table id="new-row-model" style="display: none">
<tbody>
<tr>
<td><input type="text" autofocus placeholder="who" name="who" ></td>
<td><input type="text" autofocus placeholder="location" name="location" ></td>
<td><input type="text" placeholder="Start Date" name="datepicker_start" class="datepicker"></td>
<td><input type="text" placeholder="End Date" name="datepicker_end" class="datepicker"></td>
<td><input type="button" name="add" value="Add" class="tr_clone_add"></td>
</tr>
<tbody>
</table>
Script
$("input.tr_clone_add").live('click', function(){
var new_row = $("#new-row-model tbody").clone();
$("#table-data tbody").append(new_row.html());
});
Math.random() explanation
To generate a number between 10 to 20 inclusive, you can use java.util.Random
int myNumber = new Random().nextInt(11) + 10
How do I install a custom font on an HTML site
You can use @font-face in most modern browsers.
Here's some articles on how it works:
- http://webdesignerwall.com/general/font-face-solutions-suggestions
- http://webdesignerwall.com/tutorials/css3-font-face-design-guide
Here is a good syntax for adding the font to your app:
Here are a couple of places to convert fonts for use with @font-face:
- http://www.fontsquirrel.com/fontface/generator
- http://fontface.codeandmore.com/
- http://www.font2web.com/
Also cufon will work if you don't want to use font-face, and it has good documentation on the web site:
Positioning background image, adding padding
first off, to be a bit of a henpeck, its best NOT to use just the <background> tag. rather, use the proper, more specific, <background-image> tag.
the only way that i'm aware of to do such a thing is to build the padding into the image by extending the matte. since the empty pixels aren't stripped, you have your padding right there. so if you need a 10px border, create 10px of empty pixels all around your image. this is mui simple in Photoshop, Fireworks, GIMP, &c.
i'd also recommend trying out the PNG8 format instead of the dying GIF... much better.
there may be an alternate solution to your problem if we knew a bit more of how you're using it. :) it LOOKS like you're trying to add an accordion button. this would be best placed in the HTML because then you can target it with JavaScript/PHP; something you cannot do if it's in the background (at least not simply). in such a case, you can style the heck out of the image you currently have in CSS by using the following:
#hello img { padding: 10px; }
WR!
Removing duplicates in the lists
In this answer, will be two sections: Two unique solutions, and a graph of speed for specific solutions.
Removing Duplicate Items
Most of these answers only remove duplicate items which are hashable, but this question doesn't imply it doesn't just need hashable items, meaning I'll offer some solutions which don't require hashable items.
collections.Counter is a powerful tool in the standard library which could be perfect for this. There's only one other solution which even has Counter in it. However, that solution is also limited to hashable keys.
To allow unhashable keys in Counter, I made a Container class, which will try to get the object's default hash function, but if it fails, it will try its identity function. It also defines an eq and a hash method. This should be enough to allow unhashable items in our solution. Unhashable objects will be treated as if they are hashable. However, this hash function uses identity for unhashable objects, meaning two equal objects that are both unhashable won't work. I suggest you override this, and changing it to use the hash of an equivalent mutable type (like using hash(tuple(my_list)) if my_list is a list).
I also made two solutions. Another solution which keeps the order of the items, using a subclass of both OrderedDict and Counter which is named 'OrderedCounter'. Now, here are the functions:
from collections import OrderedDict, Counter
class Container:
def __init__(self, obj):
self.obj = obj
def __eq__(self, obj):
return self.obj == obj
def __hash__(self):
try:
return hash(self.obj)
except:
return id(self.obj)
class OrderedCounter(Counter, OrderedDict):
'Counter that remembers the order elements are first encountered'
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, OrderedDict(self))
def __reduce__(self):
return self.__class__, (OrderedDict(self),)
def remd(sequence):
cnt = Counter()
for x in sequence:
cnt[Container(x)] += 1
return [item.obj for item in cnt]
def oremd(sequence):
cnt = OrderedCounter()
for x in sequence:
cnt[Container(x)] += 1
return [item.obj for item in cnt]
remd is non-ordered sorting, oremd is ordered sorting. You can clearly tell which one is faster, but I'll explain anyways. The non-ordered sorting is slightly faster. It keeps less data, since it doesn't need order.
Now, I also wanted to show the speed comparisons of each answer. So, I'll do that now.
Which Function is the Fastest?
For removing duplicates, I gathered 10 functions from a few answers. I calculated the speed of each function and put it into a graph using matplotlib.pyplot.
I divided this into three rounds of graphing. A hashable is any object which can be hashed, an unhashable is any object which cannot be hashed. An ordered sequence is a sequence which preserves order, an unordered sequence does not preserve order. Now, here are a few more terms:
Unordered Hashable was for any method which removed duplicates, which didn't necessarily have to keep the order. It didn't have to work for unhashables, but it could.
Ordered Hashable was for any method which kept the order of the items in the list, but it didn't have to work for unhashables, but it could.
Ordered Unhashable was any method which kept the order of the items in the list, and worked for unhashables.
On the y-axis is the amount of seconds it took.
On the x-axis is the number the function was applied to.
We generated sequences for unordered hashables and ordered hashables with the following comprehension: [list(range(x)) + list(range(x)) for x in range(0, 1000, 10)]
For ordered unhashables: [[list(range(y)) + list(range(y)) for y in range(x)] for x in range(0, 1000, 10)]
Note there is a 'step' in the range because without it, this would've taken 10x as long. Also because in my personal opinion, I thought it might've looked a little easier to read.
Also note the keys on the legend are what I tried to guess as the most vital parts of the function. As for what function does the worst or best? The graph speaks for itself.
With that settled, here are the graphs.
Unordered Hashables
(Zoomed in)
Ordered Hashables
(Zoomed in)
Ordered Unhashables
(Zoomed in)
jquery remove "selected" attribute of option?
It's something in the way jQuery translates to IE8, not necessarily the browser itself.
I was able to work around by going old school and breaking out of jQuery for one line:
document.getElementById('myselect').selectedIndex = -1;
jQuery if checkbox is checked
See main difference between ATTR | PROP | IS below:
Source: http://api.jquery.com/attr/
$( "input" )_x000D_
.change(function() {_x000D_
var $input = $( this );_x000D_
$( "p" ).html( ".attr( 'checked' ): <b>" + $input.attr( "checked" ) + "</b><br>" +_x000D_
".prop( 'checked' ): <b>" + $input.prop( "checked" ) + "</b><br>" +_x000D_
".is( ':checked' ): <b>" + $input.is( ":checked" ) + "</b>" );_x000D_
})_x000D_
.change();p {_x000D_
margin: 20px 0 0;_x000D_
}_x000D_
b {_x000D_
color: blue;_x000D_
}<meta charset="utf-8">_x000D_
<title>attr demo</title>_x000D_
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<input id="check1" type="checkbox" checked="checked">_x000D_
<label for="check1">Check me</label>_x000D_
<p></p>_x000D_
_x000D_
_x000D_
_x000D_
</body>_x000D_
</html>Cannot instantiate the type List<Product>
Interfaces can not be directly instantiated, you should instantiate classes that implements such Interfaces.
Try this:
NameValuePair[] params = new BasicNameValuePair[] {
new BasicNameValuePair("param1", param1),
new BasicNameValuePair("param2", param2),
};
Declaring variables inside loops, good practice or bad practice?
For C++ it depends on what you are doing. OK, it is stupid code but imagine
class myTimeEatingClass { public: //constructor myTimeEatingClass() { sleep(2000); ms_usedTime+=2; } ~myTimeEatingClass() { sleep(3000); ms_usedTime+=3; } const unsigned int getTime() const { return ms_usedTime; } static unsigned int ms_usedTime; };
myTimeEatingClass::ms_CreationTime=0;
myFunc()
{
for (int counter = 0; counter <= 10; counter++) {
myTimeEatingClass timeEater();
//do something
}
cout << "Creating class took "<< timeEater.getTime() <<"seconds at all<<endl;
}
myOtherFunc()
{
myTimeEatingClass timeEater();
for (int counter = 0; counter <= 10; counter++) {
//do something
}
cout << "Creating class took "<< timeEater.getTime() <<"seconds at all<<endl;
}
You will wait 55 seconds until you get the output of myFunc. Just because each loop contructor and destructor together need 5 seconds to finish.
You will need 5 seconds until you get the output of myOtherFunc.
Of course, this is a crazy example.
But it illustrates that it might become a performance issue when each loop the same construction is done when the constructor and / or destructor needs some time.
Force re-download of release dependency using Maven
Most answers provided above would solve the problem.
But if you use IntelliJ and want it to just fix it for you automatically, go to Maven Settings.
Build,Execution, Deployment -> Build Tools -> Maven
Disable Work Offline
Enable Always update snapshots (Switch when required)
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
The different methods are indications of priority. As you've listed them, they're going from least to most important. I think how you specifically map them to debug logs in your code depends on the component or app you're working on, as well as how Android treats them on different build flavors (eng, userdebug, and user). I have done a fair amount of work in the native daemons in Android, and this is how I do it. It may not apply directly to your app, but there may be some common ground. If my explanation sounds vague, it's because some of this is more of an art than a science. My basic rule is to be as efficient as possible, ensure you can reasonably debug your component without killing the performance of the system, and always check for errors and log them.
V - Printouts of state at different intervals, or upon any events occurring which my component processes. Also possibly very detailed printouts of the payloads of messages/events that my component receives or sends.
D - Details of minor events that occur within my component, as well as payloads of messages/events that my component receives or sends.
I - The header of any messages/events that my component receives or sends, as well as any important pieces of the payload which are critical to my component's operation.
W - Anything that happens that is unusual or suspicious, but not necessarily an error.
E - Errors, meaning things that aren't supposed to happen when things are working as they should.
The biggest mistake I see people make is that they overuse things like V, D, and I, but never use W or E. If an error is, by definition, not supposed to happen, or should only happen very rarely, then it's extremely cheap for you to log a message when it occurs. On the other hand, if every time somebody presses a key you do a Log.i(), you're abusing the shared logging resource. Of course, use common sense and be careful with error logs for things outside of your control (like network errors), or those contained in tight loops.
Maybe Bad
Log.i("I am here");
Good
Log.e("I shouldn't be here");
With all this in mind, the closer your code gets to "production ready", the more you can restrict the base logging level for your code (you need V in alpha, D in beta, I in production, or possibly even W in production). You should run through some simple use cases and view the logs to ensure that you can still mostly understand what's happening as you apply more restrictive filtering. If you run with the filter below, you should still be able to tell what your app is doing, but maybe not get all the details.
logcat -v threadtime MyApp:I *:S
Test if number is odd or even
This code checks if the number is odd or even in PHP. In the example $a is 2 and you get even number. If you need odd then change the $a value
$a=2;
if($a %2 == 0){
echo "<h3>This Number is <b>$a</b> Even</h3>";
}else{
echo "<h3>This Number is <b>$a</b> Odd</h3>";
}
Create a date time with month and day only, no year
Well, you can create your own type - but a DateTime always has a full date and time. You can't even have "just a date" using DateTime - the closest you can come is to have a DateTime at midnight.
You could always ignore the year though - or take the current year:
// Consider whether you want DateTime.UtcNow.Year instead
DateTime value = new DateTime(DateTime.Now.Year, month, day);
To create your own type, you could always just embed a DateTime within a struct, and proxy on calls like AddDays etc:
public struct MonthDay : IEquatable<MonthDay>
{
private readonly DateTime dateTime;
public MonthDay(int month, int day)
{
dateTime = new DateTime(2000, month, day);
}
public MonthDay AddDays(int days)
{
DateTime added = dateTime.AddDays(days);
return new MonthDay(added.Month, added.Day);
}
// TODO: Implement interfaces, equality etc
}
Note that the year you choose affects the behaviour of the type - should Feb 29th be a valid month/day value or not? It depends on the year...
Personally I don't think I would create a type for this - instead I'd have a method to return "the next time the program should be run".
Adding author name in Eclipse automatically to existing files
Actually in Eclipse Indigo thru Oxygen, you have to go to the Types template Window -> Preferences -> Java -> Code Style -> Code templates -> (in right-hand pane) Comments -> double-click Types and make sure it has the following, which it should have by default:
/**
* @author ${user}
*
* ${tags}
*/
and as far as I can tell, there is nothing in Eclipse to add the javadoc automatically to existing files in one batch. You could easily do it from the command line with sed & awk but that's another question.
If you are prepared to open each file individually, then selected the class / interface declaration line, e.g. public class AdamsClass { and then hit the key combo Shift + Alt + J and that will insert a new javadoc comment above, along with the author tag for your user. To experiment with other settings, go to Windows->Preferences->Java->Editor->Templates.
MongoDB running but can't connect using shell
I had a similar problem, well actually the same (mongo process is running but can't connect to it). What I did was went to my database path and removed mongod.lock, and then gave it another try (restarted mongo). After that it worked.
Hope it works for you too. mongodb repair on ubuntu
ORA-12154 could not resolve the connect identifier specified
Another obnoxious error type I've encountered in Oracle 11: entries in tnsnames.ora that don't begin at the first column of the line (' XXX=(...)' instead of 'XXX=(...)') and are parsed together with the preceding entry, making it malformed.
Like replaced orr misplaced tnsnames.ora files, this type of problem is easy to diagnose with the tnsping command-line utility: you pass it the name of a tnsnames.ora entry and it gives the complete text of its definition.
Finding rows that don't contain numeric data in Oracle
You can use this one check:
create or replace function to_n(c varchar2) return number is
begin return to_number(c);
exception when others then return -123456;
end;
select id, n from t where to_n(n) = -123456;
How to build splash screen in windows forms application?
First, create your splash screen as a borderless, immovable form with your image on it, set to initially display at the center of the screen, colored the way you want. All of this can be set from within the designer; specifically, you want to:
- Set the form's ControlBox, MaximizeBox, MinimizeBox and ShowIcon properties to "False"
- Set the StartPosition property to "CenterScreen"
- Set the FormBorderStyle property to "None"
- Set the form's MinimumSize and MaximumSize to be the same as its initial Size.
Then, you need to decide where to show it and where to dismiss it. These two tasks need to occur on opposite sides of the main startup logic of your program. This could be in your application's main() routine, or possibly in your main application form's Load handler; wherever you're creating large expensive objects, reading settings from the hard drive, and generally taking a long time to do stuff behind the scenes before the main application screen displays.
Then, all you have to do is create an instance of your form, Show() it, and keep a reference to it while you do your startup initialization. Once your main form has loaded, Close() it.
If your splash screen will have an animated image on it, the window will need to be "double-buffered" as well, and you will need to be absolutely sure that all initialization logic happens outside the GUI thread (meaning you cannot have your main loading logic in the mainform's Load handler; you'll have to create a BackgroundWorker or some other threaded routine.
java.lang.NoClassDefFoundError: org/apache/juli/logging/LogFactory
If you are using jsvc to run tomcat as tomcat (run /etc/init.d/tomcat as root), edit /etc/init.d/tomcat and add $CATALINA_HOME/bin/tomcat-juli.jar to CLASSPATH.
Where does Oracle SQL Developer store connections?
If you don't find the connections.xml then right-click on Connections in the Connections view of SQLDeveloper, and choose Export connections.
Java String import
Java compiler imports 3 packages by default.
1. The package without name
2. The java.lang package(That's why you can declare String, Integer, System classes without import)
3. The current package (current file's package)
That's why you don't need to declare import statement for the java.lang package.
how to convert milliseconds to date format in android?
public class LogicconvertmillistotimeActivity extends Activity {
/** Called when the activity is first created. */
EditText millisedit;
Button millisbutton;
TextView millistextview;
long millislong;
String millisstring;
int millisec=0,sec=0,min=0,hour=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
millisedit=(EditText)findViewById(R.id.editText1);
millisbutton=(Button)findViewById(R.id.button1);
millistextview=(TextView)findViewById(R.id.textView1);
millisbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
millisbutton.setClickable(false);
millisec=0;
sec=0;
min=0;
hour=0;
millisstring=millisedit.getText().toString().trim();
millislong= Long.parseLong(millisstring);
Calendar cal = Calendar.getInstance();
SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
if(millislong>1000){
sec=(int) (millislong/1000);
millisec=(int)millislong%1000;
if(sec>=60){
min=sec/60;
sec=sec%60;
}
if(min>=60){
hour=min/60;
min=min%60;
}
}
else
{
millisec=(int)millislong;
}
cal.clear();
cal.set(Calendar.HOUR_OF_DAY,hour);
cal.set(Calendar.MINUTE,min);
cal.set(Calendar.SECOND, sec);
cal.set(Calendar.MILLISECOND,millisec);
String DateFormat = formatter.format(cal.getTime());
// DateFormat = "";
millistextview.setText(DateFormat);
}
});
}
}
Convert string to number field
Within Crystal, you can do it by creating a formula that uses the ToNumber function. It might be a good idea to code for the possibility that the field might include non-numeric data - like so:
If NumericText ({field}) then ToNumber ({field}) else 0
Alternatively, you might find it easier to convert the field's datatype within the query used in the report.
Spring RestTemplate - how to enable full debugging/logging of requests/responses?
None of these answers actually solve 100% of the problem. mjj1409 gets most of it, but conveniently avoids the issue of logging the response, which takes a bit more work. Paul Sabou provides a solution that seems realistic, but doesn't provide enough details to actually implement (and it didn't work at all for me). Sofiene got the logging but with a critical problem: the response is no longer readable because the input stream has already been consumed!
I recommend using a BufferingClientHttpResponseWrapper to wrap the response object to allow reading the response body multiple times:
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {
private static final Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class);
@Override
public ClientHttpResponse intercept(final HttpRequest request, final byte[] body,
final ClientHttpRequestExecution execution) throws IOException {
ClientHttpResponse response = execution.execute(request, body);
response = log(request, body, response);
return response;
}
private ClientHttpResponse log(final HttpRequest request, final byte[] body, final ClientHttpResponse response) {
final ClientHttpResponse responseCopy = new BufferingClientHttpResponseWrapper(response);
logger.debug("Method: ", request.getMethod().toString());
logger.debug("URI: ", , request.getURI().toString());
logger.debug("Request Body: " + new String(body));
logger.debug("Response body: " + IOUtils.toString(responseCopy.getBody()));
return responseCopy;
}
}
This will not consume the InputStream because the response body is loaded into memory and can be read multiple times. If you do not have the BufferingClientHttpResponseWrapper on your classpath, you can find the simple implementation here:
For setting up the RestTemplate:
LoggingRequestInterceptor loggingInterceptor = new LoggingRequestInterceptor();
restTemplate.getInterceptors().add(loggingInterceptor);
ViewPager and fragments — what's the right way to store fragment's state?
I came up with this simple and elegant solution. It assumes that the activity is responsible for creating the Fragments, and the Adapter just serves them.
This is the adapter's code (nothing weird here, except for the fact that mFragments is a list of fragments maintained by the Activity)
class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public CharSequence getPageTitle(int position) {
TabFragment fragment = (TabFragment)mFragments.get(position);
return fragment.getTitle();
}
}
The whole problem of this thread is getting a reference of the "old" fragments, so I use this code in the Activity's onCreate.
if (savedInstanceState!=null) {
if (getSupportFragmentManager().getFragments()!=null) {
for (Fragment fragment : getSupportFragmentManager().getFragments()) {
mFragments.add(fragment);
}
}
}
Of course you can further fine tune this code if needed, for example making sure the fragments are instances of a particular class.
How do I exit a while loop in Java?
Take a look at the Java™ Tutorials by Oracle.
But basically, as dacwe said, use break.
If you can it is often clearer to avoid using break and put the check as a condition of the while loop, or using something like a do while loop. This isn't always possible though.
How to save a base64 image to user's disk using JavaScript?
HTML5 download attribute
Just to allow user to download the image or other file you may use the HTML5 download attribute.
Static file download
<a href="/images/image-name.jpg" download>
<!-- OR -->
<a href="/images/image-name.jpg" download="new-image-name.jpg">
Dynamic file download
In cases requesting image dynamically it is possible to emulate such download.
If your image is already loaded and you have the base64 source then:
function saveBase64AsFile(base64, fileName) {
var link = document.createElement("a");
document.body.appendChild(link); // for Firefox
link.setAttribute("href", base64);
link.setAttribute("download", fileName);
link.click();
}
Otherwise if image file is downloaded as Blob you can use FileReader to convert it to Base64:
function saveBlobAsFile(blob, fileName) {
var reader = new FileReader();
reader.onloadend = function () {
var base64 = reader.result ;
var link = document.createElement("a");
document.body.appendChild(link); // for Firefox
link.setAttribute("href", base64);
link.setAttribute("download", fileName);
link.click();
};
reader.readAsDataURL(blob);
}
Firefox
The anchor tag you are creating also needs to be added to the DOM in Firefox, in order to be recognized for click events (Link).
IE is not supported: Caniuse link
How to convert string to float?
Why one should not use function atof() to convert string to double?
On success, atof() function returns the converted floating point number as a double value. If no valid conversion could be performed, the function returns zero (0.0). If the converted value would be out of the range of representable values by a double, it causes undefined behavior.
Refrence:http://www.cplusplus.com/reference/cstdlib/atof/
Instead use function strtod(), it is more robust.
Try this code:
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
char s[100] = "4.0800";
printf("Float value : %4.8f\n",strtod(s,NULL));
return 0;
}
You will get the following output:
Float value : 4.08000000
How to get a value inside an ArrayList java
Assuming your Car class has a getter method for price, you can simply use
System.out.println (car.get(i).getPrice());
where i is the index of the element.
You can also use
Car c = car.get(i);
System.out.println (c.getPrice());
You also need to return totalprice from your function if you need to store it
main
public static void processCar(ArrayList<Car> cars){
int totalAmount=0;
for (int i=0; i<cars.size(); i++){
int totalprice= cars.get(i).computeCars ();
totalAmount=+ totalprice;
}
}
And change the return type of your function
public int computeCars (){
int totalprice= price+tax;
System.out.println (name + "\t" +totalprice+"\t"+year );
return totalprice;
}
Mongod complains that there is no /data/db folder
Tilo has the answer that worked for me up until THIS:
sudo chown -R 126:135 /data/db
I had to use:
sudo chown -R $USER /data/db
What's the difference between a Python module and a Python package?
A module is a single file (or files) that are imported under one import and used. e.g.
import my_module
A package is a collection of modules in directories that give a package hierarchy.
from my_package.timing.danger.internets import function_of_love
CSS: Position text in the middle of the page
Here's a method using display:flex:
.container {_x000D_
height: 100%;_x000D_
width: 100%;_x000D_
display: flex;_x000D_
position: fixed;_x000D_
align-items: center;_x000D_
justify-content: center;_x000D_
}<div class="container">_x000D_
<div>centered text!</div>_x000D_
</div>Convert a String to a byte array and then back to the original String
I would suggest using the members of string, but with an explicit encoding:
byte[] bytes = text.getBytes("UTF-8");
String text = new String(bytes, "UTF-8");
By using an explicit encoding (and one which supports all of Unicode) you avoid the problems of just calling text.getBytes() etc:
- You're explicitly using a specific encoding, so you know which encoding to use later, rather than relying on the platform default.
- You know it will support all of Unicode (as opposed to, say, ISO-Latin-1).
EDIT: Even though UTF-8 is the default encoding on Android, I'd definitely be explicit about this. For example, this question only says "in Java or Android" - so it's entirely possible that the code will end up being used on other platforms.
Basically given that the normal Java platform can have different default encodings, I think it's best to be absolutely explicit. I've seen way too many people using the default encoding and losing data to take that risk.
EDIT: In my haste I forgot to mention that you don't have to use the encoding's name - you can use a Charset instead. Using Guava I'd really use:
byte[] bytes = text.getBytes(Charsets.UTF_8);
String text = new String(bytes, Charsets.UTF_8);
Nginx no-www to www and www to no-www
if ($host ~* ^www.example.com$) {
return 301 $scheme://example.com$request_uri;
}
Scanner only reads first word instead of line
input.next() takes in the first whitsepace-delimited word of the input string. So by design it does what you've described. Try input.nextLine().
How to return result of a SELECT inside a function in PostgreSQL?
Hi please check the below link
https://www.postgresql.org/docs/current/xfunc-sql.html
EX:
CREATE FUNCTION sum_n_product_with_tab (x int)
RETURNS TABLE(sum int, product int) AS $$
SELECT $1 + tab.y, $1 * tab.y FROM tab;
$$ LANGUAGE SQL;
Detect Safari browser
I don't know why the OP wanted to detect Safari, but in the rare case you need browser sniffing nowadays it's problably more important to detect the render engine than the name of the browser. For example on iOS all browsers use the Safari/Webkit engine, so it's pointless to get "chrome" or "firefox" as browser name if the underlying renderer is in fact Safari/Webkit. I haven't tested this code with old browsers but it works with everything fairly recent on Android, iOS, OS X, Windows and Linux.
<script>
let browserName = "";
if(navigator.vendor.match(/google/i)) {
browserName = 'chrome/blink';
}
else if(navigator.vendor.match(/apple/i)) {
browserName = 'safari/webkit';
}
else if(navigator.userAgent.match(/firefox\//i)) {
browserName = 'firefox/gecko';
}
else if(navigator.userAgent.match(/edge\//i)) {
browserName = 'edge/edgehtml';
}
else if(navigator.userAgent.match(/trident\//i)) {
browserName = 'ie/trident';
}
else
{
browserName = navigator.userAgent + "\n" + navigator.vendor;
}
alert(browserName);
</script>
To clarify:
- All browsers under iOS will be reported as "safari/webkit"
- All browsers under Android but Firefox will be reported as "chrome/blink"
- Chrome, Opera, Blisk, Vivaldi etc. will all be reported as "chrome/blink" under Windows, OS X or Linux
Generating Fibonacci Sequence
function getFibonacciNumbers(n) {
var sequence = [0, 1];
if (n === 0 || n === 1) {
return sequence[n];
}
else {
for (var i = 2; i < n; i++ ) {
var sum = sequence[i - 1] + sequence[i - 2];
sequence.push(sum);
}
return sequence;
}
}
console.log(getFibonacciNumbers(0));
console.log(getFibonacciNumbers(1));
console.log(getFibonacciNumbers(9));
Huge performance difference when using group by vs distinct
The two queries express the same question. Apparently the query optimizer chooses two different execution plans. My guess would be that the distinct approach is executed like:
- Copy all
business_keyvalues to a temporary table - Sort the temporary table
- Scan the temporary table, returning each item that is different from the one before it
The group by could be executed like:
- Scan the full table, storing each value of
business keyin a hashtable - Return the keys of the hashtable
The first method optimizes for memory usage: it would still perform reasonably well when part of the temporary table has to be swapped out. The second method optimizes for speed, but potentially requires a large amount of memory if there are a lot of different keys.
Since you either have enough memory or few different keys, the second method outperforms the first. It's not unusual to see performance differences of 10x or even 100x between two execution plans.
What is the Python 3 equivalent of "python -m SimpleHTTPServer"
The equivalent is:
python3 -m http.server
Fast way to discover the row count of a table in PostgreSQL
For SQL Server (2005 or above) a quick and reliable method is:
SELECT SUM (row_count)
FROM sys.dm_db_partition_stats
WHERE object_id=OBJECT_ID('MyTableName')
AND (index_id=0 or index_id=1);
Details about sys.dm_db_partition_stats are explained in MSDN
The query adds rows from all parts of a (possibly) partitioned table.
index_id=0 is an unordered table (Heap) and index_id=1 is an ordered table (clustered index)
Even faster (but unreliable) methods are detailed here.
Oracle date difference to get number of years
If you just want the difference in years, there's:
SELECT EXTRACT(YEAR FROM date1) - EXTRACT(YEAR FROM date2) FROM mytable
Or do you want fractional years as well?
SELECT (date1 - date2) / 365.242199 FROM mytable
365.242199 is 1 year in days, according to Google.
Using OR in SQLAlchemy
From the tutorial:
from sqlalchemy import or_
filter(or_(User.name == 'ed', User.name == 'wendy'))
Nested objects in javascript, best practices
var defaultsettings = {
ajaxsettings: {
...
},
uisettings: {
...
}
};
Can I configure a subdomain to point to a specific port on my server
If you have access to SRV Records, you can use them to get what you want :)
E.G
A Records
Name: mc1.domain.com
Value: <yourIP>
Name: mc2.domain.com
Value: <yourIP>
SRV Records
Name: _minecraft._tcp.mc1.domain.com
Priority: 5
Weight: 5
Port: 25565
Value: mc1.domain.com
Name: _minecraft._tcp.mc2.domain.com
Priority: 5
Weight: 5
Port: 25566
Value: mc2.domain.com
then in minecraft you can use
mc1.domain.com which will sign you into server 1 using port 25565
and
mc2.domain.com which will sign you into server 2 using port 25566
then on your router you can have it point 25565 and 25566 to the machine with both servers on and Voilà!
Source: This works for me running 2 minecraft servers on the same machine with ports 50500 and 50501
MySQL error 2006: mysql server has gone away
This error is occur due to expire of wait_timeout .
Just go to mysql server check its wait_timeout :
mysql> SHOW VARIABLES LIKE 'wait_timeout'
mysql> set global wait_timeout = 600 # 10 minute or maximum wait time out you need
http://sggoyal.blogspot.in/2015/01/2006-mysql-server-has-gone-away.html