C# list.Orderby descending
var newList = list.OrderBy(x => x.Product.Name).Reverse()
This should do the job.
Swift - Split string over multiple lines
I tried several ways but found an even better solution: Just use a "Text View" element. It's text shows up multiple lines automatically! Found here: UITextField multiple lines
Background color for Tk in Python
root.configure(background='black')
or more generally
<widget>.configure(background='black')
How do I style a <select> dropdown with only CSS?
<select> tags can be styled through CSS just like any other HTML element on an HTML page rendered in a browser. Below is an (overly simple) example that will position a select element on the page and render the text of the options in blue.
Example HTML file (selectExample.html):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Select Styling</title>
<link href="selectExample.css" rel="stylesheet">
</head>
<body>
<select id="styledSelect" class="blueText">
<option value="apple">Apple</option>
<option value="orange">Orange</option>
<option value="cherry">Cherry</option>
</select>
</body>
</html>
Example CSS file (selectExample.css):
/* All select elements on page */
select {
position: relative;
}
/* Style by class. Effects the text of the contained options. */
.blueText {
color: #0000FF;
}
/* Style by id. Effects position of the select drop down. */
#styledSelect {
left: 100px;
}
List all of the possible goals in Maven 2?
Strange nobody listed an actual command to do it:
mvn help:describe -e -Dplugin=site
If you want to list all goals of the site plugin. Output:
Name: Apache Maven Site Plugin Description: The Maven Site Plugin is a plugin that generates a site for the current project. Group Id: org.apache.maven.plugins Artifact Id: maven-site-plugin Version: 3.7.1 Goal Prefix: site
This plugin has 9 goals:
site:attach-descriptor Description: Adds the site descriptor (site.xml) to the list of files to be installed/deployed. For Maven-2.x this is enabled by default only when the project has pom packaging since it will be used by modules inheriting, but this can be enabled for other projects packaging if needed. This default execution has been removed from the built-in lifecycle of Maven 3.x for pom-projects. Users that actually use those projects to provide a common site descriptor for sub modules will need to explicitly define this goal execution to restore the intended behavior.
site:deploy Description: Deploys the generated site using wagon supported protocols to the site URL specified in the section of the POM. For scp protocol, the website files are packaged by wagon into zip archive, then the archive is transfered to the remote host, next it is un-archived which is much faster than making a file by file copy.
site:effective-site Description: Displays the effective site descriptor as an XML for this build, after inheritance and interpolation of site.xml, for the first locale.
site:help Description: Display help information on maven-site-plugin. Call mvn site:help -Ddetail=true -Dgoal= to display parameter details.
site:jar Description: Bundles the site output into a JAR so that it can be deployed to a repository.
site:run Description: Starts the site up, rendering documents as requested for faster editing. It uses Jetty as the web server.
site:site Description: Generates the site for a single project. Note that links between module sites in a multi module build will not work, since local build directory structure doesn't match deployed site.
site:stage Description: Deploys the generated site to a local staging or mock directory based on the site URL specified in the section of the POM. It can be used to test that links between module sites in a multi-module build work.
This goal requires the site to already have been generated using the site goal, such as by calling mvn site.
site:stage-deploy Description: Deploys the generated site to a staging or mock URL to the site URL specified in the section of the POM, using wagon supported protocols
For more information, run 'mvn help:describe [...] -Ddetail'
More details on https://mkyong.com/maven/how-to-display-maven-plugin-goals-and-parameters/
React Native Border Radius with background color
Never give borderRadius to your <Text /> always wrap that <Text /> inside your <View /> or in your <TouchableOpacity/>.
borderRadius on <Text /> will work perfectly on Android devices. But on IOS devices it won't work.
So keep this in your practice to wrap your <Text/> inside your <View/> or on <TouchableOpacity/> and then give the borderRadius to that <View /> or <TouchableOpacity /> so that it will work on both Android as well as on IOS devices.
For example:-
<TouchableOpacity style={{borderRadius: 15}}>
<Text>Button Text</Text>
</TouchableOpacity>
-Thanks
How do I compare two variables containing strings in JavaScript?
I used below function to compare two strings and It is working good.
function CompareUserId (first, second)
{
var regex = new RegExp('^' + first+ '$', 'i');
if (regex.test(second))
{
return true;
}
else
{
return false;
}
return false;
}
How to remove list elements in a for loop in Python?
import copy
a = ["a", "b", "c", "d", "e"]
b = copy.copy(a)
for item in a:
print item
b.remove(item)
a = copy.copy(b)
Works: to avoid changing the list you are iterating on, you make a copy of a, iterate over it and remove the items from b. Then you copy b (the altered copy) back to a.
How to convert an object to JSON correctly in Angular 2 with TypeScript
If you are solely interested in outputting the JSON somewhere in your HTML, you could also use a pipe inside an interpolation. For example:
<p> {{ product | json }} </p>
I am not entirely sure it works for every AngularJS version, but it works perfectly in my Ionic App (which uses Angular 2+).
android View not attached to window manager
I had this issue where on a screen orientation change, the activity finished before the AsyncTask with the progress dialog completed. I seemed to resolve this by setting the dialog to null onPause() and then checking this in the AsyncTask before dismissing.
@Override
public void onPause() {
super.onPause();
if ((mDialog != null) && mDialog.isShowing())
mDialog.dismiss();
mDialog = null;
}
... in my AsyncTask:
protected void onPreExecute() {
mDialog = ProgressDialog.show(mContext, "", "Saving changes...",
true);
}
protected void onPostExecute(Object result) {
if ((mDialog != null) && mDialog.isShowing()) {
mDialog.dismiss();
}
}
Generic deep diff between two objects
I've developed the Function named "compareValue()" in Javascript. it returns whether the value is same or not. I've called compareValue() in for loop of one Object. you can get difference of two objects in diffParams.
var diffParams = {};_x000D_
var obj1 = {"a":"1", "b":"2", "c":[{"key":"3"}]},_x000D_
obj2 = {"a":"1", "b":"66", "c":[{"key":"55"}]};_x000D_
_x000D_
for( var p in obj1 ){_x000D_
if ( !compareValue(obj1[p], obj2[p]) ){_x000D_
diffParams[p] = obj1[p];_x000D_
}_x000D_
}_x000D_
_x000D_
function compareValue(val1, val2){_x000D_
var isSame = true;_x000D_
for ( var p in val1 ) {_x000D_
_x000D_
if (typeof(val1[p]) === "object"){_x000D_
var objectValue1 = val1[p],_x000D_
objectValue2 = val2[p];_x000D_
for( var value in objectValue1 ){_x000D_
isSame = compareValue(objectValue1[value], objectValue2[value]);_x000D_
if( isSame === false ){_x000D_
return false;_x000D_
}_x000D_
}_x000D_
}else{_x000D_
if(val1 !== val2){_x000D_
isSame = false;_x000D_
}_x000D_
}_x000D_
}_x000D_
return isSame;_x000D_
}_x000D_
console.log(diffParams);Enabling/installing GD extension? --without-gd
If You're using php5.6 and Ubuntu 18.04 Then run these two commands in your terminal your errors will be solved definitely.
sudo apt-get install php5.6-gd
then restart your apache server by this command.
sudo service apache2 restart
Some projects cannot be imported because they already exist in the workspace error in Eclipse
Try to rename the value of <name> tag which inside ".project" file of your project.
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>Rename this value</name>
<comment></comment>
<projects>
This will work for sure. Here you are just renaming your project.
How to scp in Python?
If you are on *nix you can use sshpass
sshpass -p password scp -o User=username -o StrictHostKeyChecking=no src dst:/path
How to disable horizontal scrolling of UIScrollView?
I had the tableview contentInset set in viewDidLoad (as below) that what causing the horizontal scrolling
self.tableView.contentInset = UIEdgeInsetsMake(0, 30, 0, 0);
Check if there are any tableview contentInset set for different reasons and disable it
Conda: Installing / upgrading directly from github
The answers are outdated. You simply have to conda install pip and git. Then you can use pip normally:
Activate your conda environment
source activate myenvconda install git pippip install git+git://github.com/scrappy/scrappy@master
how to transfer a file through SFTP in java?
Try this code.
public void send (String fileName) {
String SFTPHOST = "host:IP";
int SFTPPORT = 22;
String SFTPUSER = "username";
String SFTPPASS = "password";
String SFTPWORKINGDIR = "file/to/transfer";
Session session = null;
Channel channel = null;
ChannelSftp channelSftp = null;
System.out.println("preparing the host information for sftp.");
try {
JSch jsch = new JSch();
session = jsch.getSession(SFTPUSER, SFTPHOST, SFTPPORT);
session.setPassword(SFTPPASS);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
System.out.println("Host connected.");
channel = session.openChannel("sftp");
channel.connect();
System.out.println("sftp channel opened and connected.");
channelSftp = (ChannelSftp) channel;
channelSftp.cd(SFTPWORKINGDIR);
File f = new File(fileName);
channelSftp.put(new FileInputStream(f), f.getName());
log.info("File transfered successfully to host.");
} catch (Exception ex) {
System.out.println("Exception found while tranfer the response.");
} finally {
channelSftp.exit();
System.out.println("sftp Channel exited.");
channel.disconnect();
System.out.println("Channel disconnected.");
session.disconnect();
System.out.println("Host Session disconnected.");
}
}
How many characters in varchar(max)
See the MSDN reference table for maximum numbers/sizes.
Bytes per varchar(max), varbinary(max), xml, text, or image column: 2^31-1
There's a two-byte overhead for the column, so the actual data is 2^31-3 max bytes in length. Assuming you're using a single-byte character encoding, that's 2^31-3 characters total. (If you're using a character encoding that uses more than one byte per character, divide by the total number of bytes per character. If you're using a variable-length character encoding, all bets are off.)
What are some resources for getting started in operating system development?
I found Robert Love's Linux Kernel Development quite interesting. It tells you about how the different subsystems in the Linux kernel works in a very down-to-earth way. Since the source is available Linux is a prime candidate for something to hack on.
Regex match digits, comma and semicolon?
Try word.matches("^[0-9,;]+$");
How do I convert a pandas Series or index to a Numpy array?
pandas >= 0.24
Deprecate your usage of .values in favour of these methods!
From v0.24.0 onwards, we will have two brand spanking new, preferred methods for obtaining NumPy arrays from Index, Series, and DataFrame objects: they are to_numpy(), and .array. Regarding usage, the docs mention:
We haven’t removed or deprecated
Series.valuesorDataFrame.values, but we highly recommend and using.arrayor.to_numpy()instead.
See this section of the v0.24.0 release notes for more information.
df.index.to_numpy()
# array(['a', 'b'], dtype=object)
df['A'].to_numpy()
# array([1, 4])
By default, a view is returned. Any modifications made will affect the original.
v = df.index.to_numpy()
v[0] = -1
df
A B
-1 1 2
b 4 5
If you need a copy instead, use to_numpy(copy=True);
v = df.index.to_numpy(copy=True)
v[-1] = -123
df
A B
a 1 2
b 4 5
Note that this function also works for DataFrames (while .array does not).
array Attribute
This attribute returns an ExtensionArray object that backs the Index/Series.
pd.__version__
# '0.24.0rc1'
# Setup.
df = pd.DataFrame([[1, 2], [4, 5]], columns=['A', 'B'], index=['a', 'b'])
df
A B
a 1 2
b 4 5
df.index.array
# <PandasArray>
# ['a', 'b']
# Length: 2, dtype: object
df['A'].array
# <PandasArray>
# [1, 4]
# Length: 2, dtype: int64
From here, it is possible to get a list using list:
list(df.index.array)
# ['a', 'b']
list(df['A'].array)
# [1, 4]
or, just directly call .tolist():
df.index.tolist()
# ['a', 'b']
df['A'].tolist()
# [1, 4]
Regarding what is returned, the docs mention,
For
SeriesandIndexes backed by normal NumPy arrays,Series.arraywill return a newarrays.PandasArray, which is a thin (no-copy) wrapper around anumpy.ndarray.arrays.PandasArrayisn’t especially useful on its own, but it does provide the same interface as any extension array defined in pandas or by a third-party library.
So, to summarise, .array will return either
- The existing
ExtensionArraybacking the Index/Series, or - If there is a NumPy array backing the series, a new
ExtensionArrayobject is created as a thin wrapper over the underlying array.
Rationale for adding TWO new methods
These functions were added as a result of discussions under two GitHub issues GH19954 and GH23623.
Specifically, the docs mention the rationale:
[...] with
.valuesit was unclear whether the returned value would be the actual array, some transformation of it, or one of pandas custom arrays (likeCategorical). For example, withPeriodIndex,.valuesgenerates a newndarrayof period objects each time. [...]
These two functions aim to improve the consistency of the API, which is a major step in the right direction.
Lastly, .values will not be deprecated in the current version, but I expect this may happen at some point in the future, so I would urge users to migrate towards the newer API, as soon as you can.
How can I get a Dialog style activity window to fill the screen?
This answer is a workaround for those who use "Theme.AppCompat.Dialog" or any other "Theme.AppCompat.Dialog" descendants like "Theme.AppCompat.Light.Dialog", "Theme.AppCompat.DayNight.Dialog", etc. I myself has to use AppCompat dialog because i use AppCompatActivity as extends for all my activities. There will be a problem that make the dialog has padding on every sides(top, right, bottom and left) if we use the accepted answer.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
}
On your Activity's style, add these code
<style name="DialogActivityTheme" parent="Theme.AppCompat.Dialog">
<item name="windowNoTitle">true</item>
<item name="android:windowBackground">@null</item>
</style>
As you may notice, the problem that generate padding to our dialog is "android:windowBackground", so here i make the window background to null.
gpg: no valid OpenPGP data found
i got this problem "gpg-no-valid-openpgp-data-found" and solve it with the following first i open browser and paste https://pkg.jenkins.io/debian/jenkins-ci.org.key then i download the key in Downloads folder then cd /Downloads/ then sudo apt-key add jenkins-ci.org.key if Appear "OK" then you success to add the key :)
Importing variables from another file?
Actually this is not really the same to import a variable with:
from file1 import x1
print(x1)
and
import file1
print(file1.x1)
Altough at import time x1 and file1.x1 have the same value, they are not the same variables. For instance, call a function in file1 that modifies x1 and then try to print the variable from the main file: you will not see the modified value.
str_replace with array
Alternatively to the answer marked as correct, if you have to replace words instead of chars you can do it with this piece of code :
$query = "INSERT INTO my_table VALUES (?, ?, ?, ?);";
$values = Array("apple", "oranges", "mangos", "papayas");
foreach (array_fill(0, count($values), '?') as $key => $wildcard) {
$query = substr_replace($query, '"'.$values[$key].'"', strpos($query, $wildcard), strlen($wildcard));
}
echo $query;
Demo here : http://sandbox.onlinephpfunctions.com/code/56de88aef7eece3d199d57a863974b84a7224fd7
What is TypeScript and why would I use it in place of JavaScript?
"TypeScript Fundamentals" -- a Pluralsight video-course by Dan Wahlin and John Papa is a really good, presently (March 25, 2016) updated to reflect TypeScript 1.8, introduction to Typescript.
For me the really good features, beside the nice possibilities for intellisense, are the classes, interfaces, modules, the ease of implementing AMD, and the possibility to use the Visual Studio Typescript debugger when invoked with IE.
To summarize: If used as intended, Typescript can make JavaScript programming more reliable, and easier. It can increase the productivity of the JavaScript programmer significantly over the full SDLC.
Difference between null and empty ("") Java String
"I call it my billion-dollar mistake. It was the invention of the null reference in 1965" - https://en.wikipedia.org/wiki/Tony_Hoare
With respect to real world both can be assumed same. Its just a syntax of a programming language that creates a difference between two as explained by others here. This simply creates overhead like when checking/comparing whether string variable has something, you have to first check if its not null and then actual string comparing ie two comparisons. This is a waste of processing power for every string comparisons.
Objects.equals() checks for null before calling .equals().
How to see tomcat is running or not
open your browser,check whether Tomcat homepage is visible by below command.
http://ipaddress:portnumber
also check this
New og:image size for Facebook share?
EDIT: The current best practices regarding Open Graph image sizes are officially outlined here: https://developers.facebook.com/docs/sharing/best-practices#images
There was a post in the Facebook developers group today, where one of the FB guys uploaded a PDF containing their new rules about image sizes – since that seems to be available only if you’re a member of the group, I uploaded it here: http://www.sendspace.com/file/ghqwhr
And they also said they will post about it in the developer blog in the coming days, so keep checking there as well
To summarize the linked document:
- Minimum size in pixels is 600x315
- Recommended size is 1200x630 - Images this size will get a larger display treatment.
- Aspect ratio should be 1.91:1
The SELECT permission was denied on the object 'sysobjects', database 'mssqlsystemresource', schema 'sys'
In my case, simply giving the user permissions on the database fixed it.
So Right click on the database -> Click Properties -> [left hand menu] Click Permissions -> and scroll down to Backup database -> Tick "Grant"
Select Rows with id having even number
You are not using Oracle, so you should be using the modulus operator:
SELECT * FROM Orders where OrderID % 2 = 0;
The MOD() function exists in Oracle, which is the source of your confusion.
Have a look at this SO question which discusses your problem.
Add borders to cells in POI generated Excel File
Setting up borders in the style used in the cells will accomplish this. Example:
style.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
How to give a time delay of less than one second in excel vba?
call waitfor(.005)
Sub WaitFor(NumOfSeconds As Single)
Dim SngSec as Single
SngSec=Timer + NumOfSeconds
Do while timer < sngsec
DoEvents
Loop
End sub
source Timing Delays in VBA
SCRIPT438: Object doesn't support property or method IE
I forgot to use var on my item variable
Incorrect code:
var itemCreateInfo = new SP.ListItemCreationInformation();
item = list.addItem(itemCreateInfo);
item.set_item('Title', 'Haytham - Oil Eng');
Correct code:
var itemCreateInfo = new SP.ListItemCreationInformation();
var item = list.addItem(itemCreateInfo);
item.set_item('Title', 'Haytham - Oil Eng');
Ajax request returns 200 OK, but an error event is fired instead of success
I have faced this issue with an updated jQuery library. If the service method is not returning anything it means that the return type is void.
Then in your Ajax call please mention dataType='text'.
It will resolve the problem.
AngularJS: How do I manually set input to $valid in controller?
You cannot directly change a form's validity. If all the descendant inputs are valid, the form is valid, if not, then it is not.
What you should do is to set the validity of the input element. Like so;
addItem.capabilities.$setValidity("youAreFat", false);
Now the input (and so the form) is invalid. You can also see which error causes invalidation.
addItem.capabilities.errors.youAreFat == true;
Nginx sites-enabled, sites-available: Cannot create soft-link between config files in Ubuntu 12.04
My site configuration file is example.conf in sites-available folder So you can create a symbolic link as
ln -s /etc/nginx/sites-available/example.conf /etc/nginx/sites-enabled/
How to make an introduction page with Doxygen
Note that with Doxygen release 1.8.0 you can also add Markdown formated pages. For this to work you need to create pages with a .md or .markdown extension, and add the following to the config file:
INPUT += your_page.md
FILE_PATTERNS += *.md *.markdown
See http://www.doxygen.nl/manual/markdown.html#md_page_header for details.
Exiting out of a FOR loop in a batch file?
Assuming that the OP is invoking a batch file with cmd.exe, to properly break out of a for loop just goto a label;
Change this:
For /L %%f In (1,1,1000000) Do If Not Exist %%f Goto :EOF
To this:
For /L %%f In (1,1,1000000) Do If Not Exist %%f Goto:fileError
.. do something
.. then exit or do somethign else
:fileError
GOTO:EOF
Better still, add some error reporting:
set filename=
For /L %%f In (1,1,1000000) Do(
set filename=%%f
If Not Exist %%f set tempGoto:fileError
)
.. do something
.. then exit or do somethign else
:fileError
echo file does not exist '%filename%'
GOTO:EOF
I find this to be a helpful site about lesser known cmd.exe/DOS batch file functions and tricks: https://www.dostips.com/
Adding custom HTTP headers using JavaScript
I think the easiest way to accomplish it is to use querystring instead of HTTP headers.
Make footer stick to bottom of page using Twitter Bootstrap
http://bootstrapfooter.codeplex.com/
This should solve your problem.
<div id="wrap">
<div id="main" class="container clear-top">
<div class="row">
<div class="span12">
Your content here.
</div>
</div>
</div>
</div>
<footer class="footer" style="background-color:#c2c2c2">
</footer>
CSS:
html,body
{
height:100%;
}
#wrap
{
min-height: 100%;
}
#main
{
overflow:auto;
padding-bottom:150px; /* this needs to be bigger than footer height*/
}
.footer
{
position: relative;
margin-top: -150px; /* negative value of footer height */
height: 150px;
clear:both;
padding-top:20px;
color:#fff;
}
How do I reference the input of an HTML <textarea> control in codebehind?
First make sure you have the runat="server" attribute in your textarea tag like this
<textarea id="TextArea1" cols="20" rows="2" runat="server"></textarea>
Then you can access the content via:
string body = TextArea1.value;
How do I delete a local repository in git?
Delete the .git directory in the root-directory of your repository if you only want to delete the git-related information (branches, versions).
If you want to delete everything (git-data, code, etc), just delete the whole directory.
.git directories are hidden by default, so you'll need to be able to view hidden files to delete it.
What are .iml files in Android Studio?
What are iml files in Android Studio project?
A Google search on iml file turns up:
IML is a module file created by IntelliJ IDEA, an IDE used to develop Java applications. It stores information about a development module, which may be a Java, Plugin, Android, or Maven component; saves the module paths, dependencies, and other settings.
(from this page)
why not to use gradle scripts to integrate with external modules that you add to your project.
You do "use gradle scripts to integrate with external modules", or your own modules.
However, Gradle is not IntelliJ IDEA's native project model — that is separate, held in .iml files and the metadata in .idea/ directories. In Android Studio, that stuff is largely generated out of the Gradle build scripts, which is why you are sometimes prompted to "sync project with Gradle files" when you change files like build.gradle. This is also why you don't bother putting .iml files or .idea/ in version control, as their contents will be regenerated.
If I have a team that work in different IDE's like Eclipse and AS how to make project IDE agnostic?
To a large extent, you can't.
You are welcome to have an Android project that uses the Eclipse-style directory structure (e.g., resources and manifest in the project root directory). You can teach Gradle, via build.gradle, how to find files in that structure. However, other metadata (compileSdkVersion, dependencies, etc.) will not be nearly as easily replicated.
Other alternatives include:
Move everybody over to another build system, like Maven, that is equally integrated (or not, depending upon your perspective) to both Eclipse and Android Studio
Hope that Andmore takes off soon, so that perhaps you can have an Eclipse IDE that can build Android projects from Gradle build scripts
Have everyone use one IDE
Generating random integer from a range
The following expression should be unbiased if I am not mistaken:
std::floor( ( max - min + 1.0 ) * rand() ) + min;
I am assuming here that rand() gives you a random value in the range between 0.0 and 1.0 NOT including 1.0 and that max and min are integers with the condition that min < max.
SQL: How to perform string does not equal
Your where clause will return all rows where tester does not match username AND where tester is not null.
If you want to include NULLs, try:
where tester <> 'username' or tester is null
If you are looking for strings that do not contain the word "username" as a substring, then like can be used:
where tester not like '%username%'
Is the Scala 2.8 collections library a case of "the longest suicide note in history"?
One way that the Scala community can help ease the fear of programmers new to Scala is to focus on practice and to teach by example--a lot of examples that start small and grow gradually larger. Here are a few sites that take this approach:
After spending some time on these sites, one quickly realizes that Scala and its libraries, though perhaps difficult to design and implement, are not so difficult to use, especially in the common cases.
How to display my application's errors in JSF?
FacesContext.addMessage(String, FacesMessage) requires the component's clientId, not it's id. If you're wondering why, think about having a control as a child of a dataTable, stamping out different values with the same control for each row - it would be possible to have a different message printed for each row. The id is always the same; the clientId is unique per row.
So "myform:mybutton" is the correct value, but hard-coding this is ill-advised. A lookup would create less coupling between the view and the business logic and would be an approach that works in more restrictive environments like portlets.
<f:view>
<h:form>
<h:commandButton id="mybutton" value="click"
binding="#{showMessageAction.mybutton}"
action="#{showMessageAction.validatePassword}" />
<h:message for="mybutton" />
</h:form>
</f:view>
Managed bean logic:
/** Must be request scope for binding */
public class ShowMessageAction {
private UIComponent mybutton;
private boolean isOK = false;
public String validatePassword() {
if (isOK) {
return "ok";
}
else {
// invalid
FacesMessage message = new FacesMessage("Invalid password length");
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(mybutton.getClientId(context), message);
}
return null;
}
public void setMybutton(UIComponent mybutton) {
this.mybutton = mybutton;
}
public UIComponent getMybutton() {
return mybutton;
}
}
Change DataGrid cell colour based on values
Just put instead
<Style TargetType="{x:DataGridCell}" >
But beware that this will target ALL your cells (you're aiming at all the objects of type DataGridCell )
If you want to put a style according to the cell type, I'd recommend you to use a DataTemplateSelector
A good example can be found in Christian Mosers' DataGrid tutorial:
http://www.wpftutorial.net/DataGrid.html#rowDetails
Have fun :)
How can I hide an HTML table row <tr> so that it takes up no space?
position: absolute will remove it from the layout flow and should solve your problem - the element will remain in the DOM but won't affect others.
When to use %r instead of %s in Python?
The %s specifier converts the object using str(), and %r converts it using repr().
For some objects such as integers, they yield the same result, but repr() is special in that (for types where this is possible) it conventionally returns a result that is valid Python syntax, which could be used to unambiguously recreate the object it represents.
Here's an example, using a date:
>>> import datetime
>>> d = datetime.date.today()
>>> str(d)
'2011-05-14'
>>> repr(d)
'datetime.date(2011, 5, 14)'
Types for which repr() doesn't produce Python syntax include those that point to external resources such as a file, which you can't guarantee to recreate in a different context.
Dockerfile if else condition with external arguments
I had a similar issue for setting proxy server on a container.
The solution I'm using is an entrypoint script, and another script for environment variables configuration. Using RUN, you assure the configuration script runs on build, and ENTRYPOINT when you run the container.
--build-arg is used on command line to set proxy user and password.
As I need the same environment variables on container startup, I used a file to "persist" it from build to run.
The entrypoint script looks like:
#!/bin/bash
# Load the script of environment variables
. /root/configproxy.sh
# Run the main container command
exec "$@"
configproxy.sh
#!/bin/bash
function start_config {
read u p < /root/proxy_credentials
export HTTP_PROXY=http://$u:[email protected]:8080
export HTTPS_PROXY=https://$u:[email protected]:8080
/bin/cat <<EOF > /etc/apt/apt.conf
Acquire::http::proxy "http://$u:[email protected]:8080";
Acquire::https::proxy "https://$u:[email protected]:8080";
EOF
}
if [ -s "/root/proxy_credentials" ]
then
start_config
fi
And in the Dockerfile, configure:
# Base Image
FROM ubuntu:18.04
ARG user
ARG pass
USER root
# -z the length of STRING is zero
# [] are an alias for test command
# if $user is not empty, write credentials file
RUN if [ ! -z "$user" ]; then echo "${user} ${pass}">/root/proxy_credentials ; fi
#copy bash scripts
COPY configproxy.sh /root
COPY startup.sh .
RUN ["/bin/bash", "-c", ". /root/configproxy.sh"]
# Install dependencies and tools
#RUN apt-get update -y && \
# apt-get install -yqq --no-install-recommends \
# vim iputils-ping
ENTRYPOINT ["./startup.sh"]
CMD ["sh", "-c", "bash"]
Build without proxy settings
docker build -t img01 -f Dockerfile .
Build with proxy settings
docker build -t img01 --build-arg user=<USER> --build-arg pass=<PASS> -f Dockerfile .
Take a look here.
Git - Ignore files during merge
You could use .gitignore to keep the config.xml out of the repository, and then use a post commit hook to upload the appropriate config.xml file to the server.
Can promises have multiple arguments to onFulfilled?
To quote the article below, ""then" takes two arguments, a callback for a success case, and another for the failure case. Both are optional, so you can add a callback for the success or failure case only."
I usually look to this page for any basic promise questions, let me know if I am wrong
How to check the version before installing a package using apt-get?
OK, I found it.
apt-cache policy <package name> will show the version details.
It also shows which version is currently installed and which versions are available to install.
For example, apt-cache policy hylafax+
PDOException SQLSTATE[HY000] [2002] No such file or directory
If you are using Laravel Homestead, here is settings
(include Vagrant-Virtual Machine)
.bash-profile
alias vm="ssh [email protected] -p 2222"
database.php
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'database' => env('DB_DATABASE', 'homestead'),
'username' => env('DB_USERNAME', 'homestead'),
'password' => env('DB_PASSWORD', 'secret'),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
],
Terminal
vm
vagrant@homestead:~/Code/projectFolder php artisan migrate:install
How to export the Html Tables data into PDF using Jspdf
A good option is AutoTable(a Table plugin for jsPDF), it includes themes, rowspan, colspan, extract data from html, works with json, you can also personalize your headers and make them horizontals. Here is a demo.
Nesting CSS classes
I do not believe this is possible. You could add class1 to all elements which also have class2. If this is not practical to do manually, you could do it automatically with JavaScript (fairly easy to do with jQuery).
Bootstrap Carousel image doesn't align properly
For the carousel, I believe all images have to be exactly the same height and width.
Also, when you refer back to the scaffolding page from bootstrap, I'm pretty sure that span16 = 940px. With this in mind, I think we can assume that if you have a
<div class="row">
<div class="span4">
<!--left content div guessing around 235px in width -->
</div>
<div class="span8">
<!--right content div guessing around 470px in width -->
</div>
</div>
So yes, you have to be careful when setting the spans space within a row because if the image width is to large, it will send your div over into the next "row" and that is no fun :P
Bash command to sum a column of numbers
I like the chosen answer. However, it tends to be slower than awk since 2 tools are needed to do the job.
$ wc -l file
49999998 file
$ time paste -sd+ file | bc
1448700364
real 1m36.960s
user 1m24.515s
sys 0m1.772s
$ time awk '{s+=$1}END{print s}' file
1448700364
real 0m45.476s
user 0m40.756s
sys 0m0.287s
How do I call a SQL Server stored procedure from PowerShell?
Use sqlcmd instead of osql if it's a 2005 database
Select multiple rows with the same value(s)
The problem is GROUP BY - if you group results by Locus, you only get one result per locus.
Try:
SELECT * FROM Genes WHERE Locus = '3' AND Chromosome = '10';
If you prefer using HAVING syntax, then GROUP BY id or something that is not repeating in the result set.
How to change the color of an image on hover
If the icon is from Font Awesome (https://fontawesome.com/icons/) then you could tap into the color css property to change it's background.
fb-icon{
color:none;
}
fb-icon:hover{
color:#0000ff;
}
This is irrespective of the color it had. So you could use an entirely different color in its usual state and define another in its active state.
What is polymorphism, what is it for, and how is it used?
Polymorphism gives you the ability to create one module calling another, and yet have the compile time dependency point against the flow of control instead of with the flow of control.
By using polymorphism, a high level module does not depend on low-level module. Both depend on abstractions. This helps us to apply the dependency inversion principle(https://en.wikipedia.org/wiki/Dependency_inversion_principle).
This is where I found the above definition. Around 50 minutes into the video the instructor explains the above. https://www.youtube.com/watch?v=TMuno5RZNeE
Android studio - Failed to find target android-18
Thank you RobertoAV96.
You're my hero. But it's not enough. In my case, I changed both compileSdkVersion, and buildToolsVersion. Now it work. Hope this help
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.6.+'
}
}
apply plugin: 'android'
dependencies {
compile fileTree(dir: 'libs', include: '*.jar')
}
android {
compileSdkVersion 19
buildToolsVersion "19"
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
resources.srcDirs = ['src']
aidl.srcDirs = ['src']
renderscript.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
// Move the tests to tests/java, tests/res, etc...
instrumentTest.setRoot('tests')
// Move the build types to build-types/<type>
// For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ..
// This moves them out of them default location under src/<type>/... which would
// conflict with src/ being used by the main source set.
// Adding new build types or product flavors should be accompanied
// by a similar customization.
debug.setRoot('build-types/debug')
release.setRoot('build-types/release')
}
}
ImportError: No module named xlsxwriter
I managed to resolve this issue as follows...
Be careful, make sure you understand the IDE you're using! - Because I didn't. I was trying to import xlsxwriter using PyCharm and was returning this error.
Assuming you have already attempted the pip installation (sudo pip install xlsxwriter) via your cmd prompt, try using another IDE e.g. Geany - & import xlsxwriter.
I tried this and Geany was importing the library fine. I opened PyCharm and navigated to 'File>Settings>Project:>Project Interpreter' xlslwriter was listed though intriguingly I couldn't import it! I double clicked xlsxwriter and hit 'install Package'... And thats it! It worked!
Hope this helps...
Using StringWriter for XML Serialization
<TL;DR> The problem is rather simple, actually: you are not matching the declared encoding (in the XML declaration) with the datatype of the input parameter. If you manually added <?xml version="1.0" encoding="utf-8"?><test/> to the string, then declaring the SqlParameter to be of type SqlDbType.Xml or SqlDbType.NVarChar would give you the "unable to switch the encoding" error. Then, when inserting manually via T-SQL, since you switched the declared encoding to be utf-16, you were clearly inserting a VARCHAR string (not prefixed with an upper-case "N", hence an 8-bit encoding, such as UTF-8) and not an NVARCHAR string (prefixed with an upper-case "N", hence the 16-bit UTF-16 LE encoding).
The fix should have been as simple as:
- In the first case, when adding the declaration stating
encoding="utf-8": simply don't add the XML declaration. - In the second case, when adding the declaration stating
encoding="utf-16": either- simply don't add the XML declaration, OR
- simply add an "N" to the input parameter type:
SqlDbType.NVarCharinstead ofSqlDbType.VarChar:-) (or possibly even switch to usingSqlDbType.Xml)
(Detailed response is below)
All of the answers here are over-complicated and unnecessary (regardless of the 121 and 184 up-votes for Christian's and Jon's answers, respectively). They might provide working code, but none of them actually answer the question. The issue is that nobody truly understood the question, which ultimately is about how the XML datatype in SQL Server works. Nothing against those two clearly intelligent people, but this question has little to nothing to do with serializing to XML. Saving XML data into SQL Server is much easier than what is being implied here.
It doesn't really matter how the XML is produced as long as you follow the rules of how to create XML data in SQL Server. I have a more thorough explanation (including working example code to illustrate the points outlined below) in an answer on this question: How to solve “unable to switch the encoding” error when inserting XML into SQL Server, but the basics are:
- The XML declaration is optional
- The XML datatype stores strings always as UCS-2 / UTF-16 LE
- If your XML is UCS-2 / UTF-16 LE, then you:
- pass in the data as either
NVARCHAR(MAX)orXML/SqlDbType.NVarChar(maxsize = -1) orSqlDbType.Xml, or if using a string literal then it must be prefixed with an upper-case "N". - if specifying the XML declaration, it must be either "UCS-2" or "UTF-16" (no real difference here)
- pass in the data as either
- If your XML is 8-bit encoded (e.g. "UTF-8" / "iso-8859-1" / "Windows-1252"), then you:
- need to specify the XML declaration IF the encoding is different than the code page specified by the default Collation of the database
- you must pass in the data as
VARCHAR(MAX)/SqlDbType.VarChar(maxsize = -1), or if using a string literal then it must not be prefixed with an upper-case "N". - Whatever 8-bit encoding is used, the "encoding" noted in the XML declaration must match the actual encoding of the bytes.
- The 8-bit encoding will be converted into UTF-16 LE by the XML datatype
With the points outlined above in mind, and given that strings in .NET are always UTF-16 LE / UCS-2 LE (there is no difference between those in terms of encoding), we can answer your questions:
Is there a reason why I shouldn't use StringWriter to serialize an Object when I need it as a string afterwards?
No, your StringWriter code appears to be just fine (at least I see no issues in my limited testing using the 2nd code block from the question).
Wouldn't setting the encoding to UTF-16 (in the xml tag) work then?
It isn't necessary to provide the XML declaration. When it is missing, the encoding is assumed to be UTF-16 LE if you pass the string into SQL Server as NVARCHAR (i.e. SqlDbType.NVarChar) or XML (i.e. SqlDbType.Xml). The encoding is assumed to be the default 8-bit Code Page if passing in as VARCHAR (i.e. SqlDbType.VarChar). If you have any non-standard-ASCII characters (i.e. values 128 and above) and are passing in as VARCHAR, then you will likely see "?" for BMP characters and "??" for Supplementary Characters as SQL Server will convert the UTF-16 string from .NET into an 8-bit string of the current Database's Code Page before converting it back into UTF-16 / UCS-2. But you shouldn't get any errors.
On the other hand, if you do specify the XML declaration, then you must pass into SQL Server using the matching 8-bit or 16-bit datatype. So if you have a declaration stating that the encoding is either UCS-2 or UTF-16, then you must pass in as SqlDbType.NVarChar or SqlDbType.Xml. Or, if you have a declaration stating that the encoding is one of the 8-bit options (i.e. UTF-8, Windows-1252, iso-8859-1, etc), then you must pass in as SqlDbType.VarChar. Failure to match the declared encoding with the proper 8 or 16 -bit SQL Server datatype will result in the "unable to switch the encoding" error that you were getting.
For example, using your StringWriter-based serialization code, I simply printed the resulting string of the XML and used it in SSMS. As you can see below, the XML declaration is included (because StringWriter does not have an option to OmitXmlDeclaration like XmlWriter does), which poses no problem so long as you pass the string in as the correct SQL Server datatype:
-- Upper-case "N" prefix == NVARCHAR, hence no error:
DECLARE @Xml XML = N'<?xml version="1.0" encoding="utf-16"?>
<string>Test ?</string>';
SELECT @Xml;
-- <string>Test ?</string>
As you can see, it even handles characters beyond standard ASCII, given that ? is BMP Code Point U+1234, and is Supplementary Character Code Point U+1F638. However, the following:
-- No upper-case "N" prefix on the string literal, hence VARCHAR:
DECLARE @Xml XML = '<?xml version="1.0" encoding="utf-16"?>
<string>Test ?</string>';
results in the following error:
Msg 9402, Level 16, State 1, Line XXXXX
XML parsing: line 1, character 39, unable to switch the encoding
Ergo, all of that explanation aside, the full solution to your original question is:
You were clearly passing the string in as SqlDbType.VarChar. Switch to SqlDbType.NVarChar and it will work without needing to go through the extra step of removing the XML declaration. This is preferred over keeping SqlDbType.VarChar and removing the XML declaration because this solution will prevent data loss when the XML includes non-standard-ASCII characters. For example:
-- No upper-case "N" prefix on the string literal == VARCHAR, and no XML declaration:
DECLARE @Xml2 XML = '<string>Test ?</string>';
SELECT @Xml2;
-- <string>Test ???</string>
As you can see, there is no error this time, but now there is data-loss 🙀.
Get event listeners attached to node using addEventListener
Since there is no native way to do this ,Here is less intrusive solution i found (dont add any 'old' prototype methods):
var ListenerTracker=new function(){
var is_active=false;
// listener tracking datas
var _elements_ =[];
var _listeners_ =[];
this.init=function(){
if(!is_active){//avoid duplicate call
intercep_events_listeners();
}
is_active=true;
};
// register individual element an returns its corresponding listeners
var register_element=function(element){
if(_elements_.indexOf(element)==-1){
// NB : split by useCapture to make listener easier to find when removing
var elt_listeners=[{/*useCapture=false*/},{/*useCapture=true*/}];
_elements_.push(element);
_listeners_.push(elt_listeners);
}
return _listeners_[_elements_.indexOf(element)];
};
var intercep_events_listeners = function(){
// backup overrided methods
var _super_={
"addEventListener" : HTMLElement.prototype.addEventListener,
"removeEventListener" : HTMLElement.prototype.removeEventListener
};
Element.prototype["addEventListener"]=function(type, listener, useCapture){
var listeners=register_element(this);
// add event before to avoid registering if an error is thrown
_super_["addEventListener"].apply(this,arguments);
// adapt to 'elt_listeners' index
useCapture=useCapture?1:0;
if(!listeners[useCapture][type])listeners[useCapture][type]=[];
listeners[useCapture][type].push(listener);
};
Element.prototype["removeEventListener"]=function(type, listener, useCapture){
var listeners=register_element(this);
// add event before to avoid registering if an error is thrown
_super_["removeEventListener"].apply(this,arguments);
// adapt to 'elt_listeners' index
useCapture=useCapture?1:0;
if(!listeners[useCapture][type])return;
var lid = listeners[useCapture][type].indexOf(listener);
if(lid>-1)listeners[useCapture][type].splice(lid,1);
};
Element.prototype["getEventListeners"]=function(type){
var listeners=register_element(this);
// convert to listener datas list
var result=[];
for(var useCapture=0,list;list=listeners[useCapture];useCapture++){
if(typeof(type)=="string"){// filtered by type
if(list[type]){
for(var id in list[type]){
result.push({"type":type,"listener":list[type][id],"useCapture":!!useCapture});
}
}
}else{// all
for(var _type in list){
for(var id in list[_type]){
result.push({"type":_type,"listener":list[_type][id],"useCapture":!!useCapture});
}
}
}
}
return result;
};
};
}();
ListenerTracker.init();
Pass table as parameter into sql server UDF
I've been dealing with a very similar problem and have been able to achieve what I was looking for, even though I'm using SQL Server 2000. I know it is an old question, but think its valid to post here the solution since there should be others like me that use old versions and still need help.
Here's the trick: SQL Server won't accept passing a table to a UDF, nor you can pass a T-SQL query so the function creates a temp table or even calls a stored procedure to do that. So, instead, I've created a reserved table, which I called xtList. This will hold the list of values (1 column, as needed) to work with.
CREATE TABLE [dbo].[xtList](
[List] [varchar](1000) NULL
) ON [PRIMARY]
Then, a stored procedure to populate the list. This is not strictly necessary, but I think is very usefull and best practice.
-- =============================================
-- Author: Zark Khullah
-- Create date: 20/06/2014
-- =============================================
CREATE PROCEDURE [dbo].[xpCreateList]
@ListQuery varchar(2000)
AS
BEGIN
SET NOCOUNT ON;
DELETE FROM xtList
INSERT INTO xtList
EXEC(@ListQuery)
END
Now, just deal with the list in any way you want, using the xtList. You can use in a procedure (for executing several T-SQL commands), scalar functions (for retrieving several strings) or multi-statement table-valued functions (retrieves the strings but like it was inside a table, 1 string per row). For any of that, you'll need cursors:
DECLARE @Item varchar(100)
DECLARE cList CURSOR DYNAMIC
FOR (SELECT * FROM xtList WHERE List is not NULL)
OPEN cList
FETCH FIRST FROM cList INTO @Item
WHILE @@FETCH_STATUS = 0 BEGIN
<< desired action with values >>
FETCH NEXT FROM cList INTO @Item
END
CLOSE cList
DEALLOCATE cList
The desired action would be as follows, depending on which type of object created:
Stored procedures
-- =============================================
-- Author: Zark Khullah
-- Create date: 20/06/2014
-- =============================================
CREATE PROCEDURE [dbo].[xpProcreateExec]
(
@Cmd varchar(8000),
@ReplaceWith varchar(1000)
)
AS
BEGIN
DECLARE @Query varchar(8000)
<< cursor start >>
SET @Query = REPLACE(@Cmd,@ReplaceWith,@Item)
EXEC(@Query)
<< cursor end >>
END
/* EXAMPLES
(List A,B,C)
Query = 'SELECT x FROM table'
with EXEC xpProcreateExec(Query,'x') turns into
SELECT A FROM table
SELECT B FROM table
SELECT C FROM table
Cmd = 'EXEC procedure ''arg''' --whatchout for wrong quotes, since it executes as dynamic SQL
with EXEC xpProcreateExec(Cmd,'arg') turns into
EXEC procedure 'A'
EXEC procedure 'B'
EXEC procedure 'C'
*/
Scalar functions
-- =============================================
-- Author: Zark Khullah
-- Create date: 20/06/2014
-- =============================================
CREATE FUNCTION [dbo].[xfProcreateStr]
(
@OriginalText varchar(8000),
@ReplaceWith varchar(1000)
)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @Result varchar(8000)
SET @Result = ''
<< cursor start >>
SET @Result = @Result + REPLACE(@OriginalText,@ReplaceWith,@Item) + char(13) + char(10)
<< cursor end >>
RETURN @Result
END
/* EXAMPLE
(List A,B,C)
Text = 'Access provided for user x'
with "SELECT dbo.xfProcreateStr(Text,'x')" turns into
'Access provided for user A
Access provided for user B
Access provided for user C'
*/
Multi-statement table-valued functions
-- =============================================
-- Author: Zark Khullah
-- Create date: 20/06/2014
-- =============================================
CREATE FUNCTION [dbo].[xfProcreateInRows]
(
@OriginalText varchar(8000),
@ReplaceWith varchar(1000)
)
RETURNS
@Texts TABLE
(
Text varchar(2000)
)
AS
BEGIN
<< cursor start >>
INSERT INTO @Texts VALUES(REPLACE(@OriginalText,@ReplaceWith,@Item))
<< cursor end >>
END
/* EXAMPLE
(List A,B,C)
Text = 'Access provided for user x'
with "SELECT * FROM dbo.xfProcreateInRow(Text,'x')" returns rows
'Access provided for user A'
'Access provided for user B'
'Access provided for user C'
*/
Callback after all asynchronous forEach callbacks are completed
This is the solution for Node.js which is asynchronous.
using the async npm package.
(JavaScript) Synchronizing forEach Loop with callbacks inside
How can I run multiple curl requests processed sequentially?
Write a script with two curl requests in desired order and run it by cron, like
#!/bin/bash
curl http://mysite.com/?update_=1
curl http://mysite.com/?the_other_thing
jquery: get id from class selector
Doh.. If I get you right, it should be as simple as:
$('.test').click(function() {_x000D_
console.log(this.id);_x000D_
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<a href="#" class="test" id="test_1">Some text</a>_x000D_
<a href="#" class="test" id="test_2">Some text</a>_x000D_
<a href="#" class="test" id="test_3">Some text</a>You can just access the id property over the underlaying dom node, within the event handler.
With arrays, why is it the case that a[5] == 5[a]?
A little bit of history now. Among other languages, BCPL had a fairly major influence on C's early development. If you declared an array in BCPL with something like:
let V = vec 10
that actually allocated 11 words of memory, not 10. Typically V was the first, and contained the address of the immediately following word. So unlike C, naming V went to that location and picked up the address of the zeroeth element of the array. Therefore array indirection in BCPL, expressed as
let J = V!5
really did have to do J = !(V + 5) (using BCPL syntax) since it was necessary to fetch V to get the base address of the array. Thus V!5 and 5!V were synonymous. As an anecdotal observation, WAFL (Warwick Functional Language) was written in BCPL, and to the best of my memory tended to use the latter syntax rather than the former for accessing the nodes used as data storage. Granted this is from somewhere between 35 and 40 years ago, so my memory is a little rusty. :)
The innovation of dispensing with the extra word of storage and having the compiler insert the base address of the array when it was named came later. According to the C history paper this happened at about the time structures were added to C.
Note that ! in BCPL was both a unary prefix operator and a binary infix operator, in both cases doing indirection. just that the binary form included an addition of the two operands before doing the indirection. Given the word oriented nature of BCPL (and B) this actually made a lot of sense. The restriction of "pointer and integer" was made necessary in C when it gained data types, and sizeof became a thing.
Adding values to specific DataTable cells
You mean you want to add a new row and only put data in a certain column? Try the following:
var row = dataTable.NewRow();
row[myColumn].Value = "my new value";
dataTable.Add(row);
As it is a data table, though, there will always be data of some kind in every column. It just might be DBNull.Value instead of whatever data type you imagine it would be.
Disable sorting on last column when using jQuery DataTables
You can use the data attribute data-orderable="false".
<th data-orderable="false">Salary</th>
$(document).ready(function() {_x000D_
$('#example').DataTable()_x000D_
});<link rel="stylesheet" href="https://cdn.datatables.net/1.10.16/css/dataTables.bootstrap4.min.css" />_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://cdn.datatables.net/1.10.16/js/jquery.dataTables.min.js"></script>_x000D_
<script src="https://cdn.datatables.net/1.10.16/js/dataTables.bootstrap4.min.js"></script>_x000D_
_x000D_
<table id="example" class="display" style="width:100%">_x000D_
<thead>_x000D_
<tr>_x000D_
<th>Name</th>_x000D_
<th>Position</th>_x000D_
<th>Office</th>_x000D_
<th>Age</th>_x000D_
<th>Start date</th>_x000D_
<th data-orderable="false">Salary</th>_x000D_
</tr>_x000D_
</thead>_x000D_
<tbody>_x000D_
<tr>_x000D_
<td>Tiger Nixon</td>_x000D_
<td>System Architect</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>61</td>_x000D_
<td>2011/04/25</td>_x000D_
<td>$320,800</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Garrett Winters</td>_x000D_
<td>Accountant</td>_x000D_
<td>Tokyo</td>_x000D_
<td>63</td>_x000D_
<td>2011/07/25</td>_x000D_
<td>$170,750</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Ashton Cox</td>_x000D_
<td>Junior Technical Author</td>_x000D_
<td>San Francisco</td>_x000D_
<td>66</td>_x000D_
<td>2009/01/12</td>_x000D_
<td>$86,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Cedric Kelly</td>_x000D_
<td>Senior Javascript Developer</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>22</td>_x000D_
<td>2012/03/29</td>_x000D_
<td>$433,060</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Airi Satou</td>_x000D_
<td>Accountant</td>_x000D_
<td>Tokyo</td>_x000D_
<td>33</td>_x000D_
<td>2008/11/28</td>_x000D_
<td>$162,700</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Brielle Williamson</td>_x000D_
<td>Integration Specialist</td>_x000D_
<td>New York</td>_x000D_
<td>61</td>_x000D_
<td>2012/12/02</td>_x000D_
<td>$372,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Herrod Chandler</td>_x000D_
<td>Sales Assistant</td>_x000D_
<td>San Francisco</td>_x000D_
<td>59</td>_x000D_
<td>2012/08/06</td>_x000D_
<td>$137,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Rhona Davidson</td>_x000D_
<td>Integration Specialist</td>_x000D_
<td>Tokyo</td>_x000D_
<td>55</td>_x000D_
<td>2010/10/14</td>_x000D_
<td>$327,900</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Colleen Hurst</td>_x000D_
<td>Javascript Developer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>39</td>_x000D_
<td>2009/09/15</td>_x000D_
<td>$205,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Sonya Frost</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>23</td>_x000D_
<td>2008/12/13</td>_x000D_
<td>$103,600</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jena Gaines</td>_x000D_
<td>Office Manager</td>_x000D_
<td>London</td>_x000D_
<td>30</td>_x000D_
<td>2008/12/19</td>_x000D_
<td>$90,560</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Quinn Flynn</td>_x000D_
<td>Support Lead</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>22</td>_x000D_
<td>2013/03/03</td>_x000D_
<td>$342,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Charde Marshall</td>_x000D_
<td>Regional Director</td>_x000D_
<td>San Francisco</td>_x000D_
<td>36</td>_x000D_
<td>2008/10/16</td>_x000D_
<td>$470,600</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Haley Kennedy</td>_x000D_
<td>Senior Marketing Designer</td>_x000D_
<td>London</td>_x000D_
<td>43</td>_x000D_
<td>2012/12/18</td>_x000D_
<td>$313,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Tatyana Fitzpatrick</td>_x000D_
<td>Regional Director</td>_x000D_
<td>London</td>_x000D_
<td>19</td>_x000D_
<td>2010/03/17</td>_x000D_
<td>$385,750</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Michael Silva</td>_x000D_
<td>Marketing Designer</td>_x000D_
<td>London</td>_x000D_
<td>66</td>_x000D_
<td>2012/11/27</td>_x000D_
<td>$198,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Paul Byrd</td>_x000D_
<td>Chief Financial Officer (CFO)</td>_x000D_
<td>New York</td>_x000D_
<td>64</td>_x000D_
<td>2010/06/09</td>_x000D_
<td>$725,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Gloria Little</td>_x000D_
<td>Systems Administrator</td>_x000D_
<td>New York</td>_x000D_
<td>59</td>_x000D_
<td>2009/04/10</td>_x000D_
<td>$237,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Bradley Greer</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>London</td>_x000D_
<td>41</td>_x000D_
<td>2012/10/13</td>_x000D_
<td>$132,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Dai Rios</td>_x000D_
<td>Personnel Lead</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>35</td>_x000D_
<td>2012/09/26</td>_x000D_
<td>$217,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jenette Caldwell</td>_x000D_
<td>Development Lead</td>_x000D_
<td>New York</td>_x000D_
<td>30</td>_x000D_
<td>2011/09/03</td>_x000D_
<td>$345,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Yuri Berry</td>_x000D_
<td>Chief Marketing Officer (CMO)</td>_x000D_
<td>New York</td>_x000D_
<td>40</td>_x000D_
<td>2009/06/25</td>_x000D_
<td>$675,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Caesar Vance</td>_x000D_
<td>Pre-Sales Support</td>_x000D_
<td>New York</td>_x000D_
<td>21</td>_x000D_
<td>2011/12/12</td>_x000D_
<td>$106,450</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Doris Wilder</td>_x000D_
<td>Sales Assistant</td>_x000D_
<td>Sidney</td>_x000D_
<td>23</td>_x000D_
<td>2010/09/20</td>_x000D_
<td>$85,600</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Angelica Ramos</td>_x000D_
<td>Chief Executive Officer (CEO)</td>_x000D_
<td>London</td>_x000D_
<td>47</td>_x000D_
<td>2009/10/09</td>_x000D_
<td>$1,200,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Gavin Joyce</td>_x000D_
<td>Developer</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>42</td>_x000D_
<td>2010/12/22</td>_x000D_
<td>$92,575</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jennifer Chang</td>_x000D_
<td>Regional Director</td>_x000D_
<td>Singapore</td>_x000D_
<td>28</td>_x000D_
<td>2010/11/14</td>_x000D_
<td>$357,650</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Brenden Wagner</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>28</td>_x000D_
<td>2011/06/07</td>_x000D_
<td>$206,850</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Fiona Green</td>_x000D_
<td>Chief Operating Officer (COO)</td>_x000D_
<td>San Francisco</td>_x000D_
<td>48</td>_x000D_
<td>2010/03/11</td>_x000D_
<td>$850,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Shou Itou</td>_x000D_
<td>Regional Marketing</td>_x000D_
<td>Tokyo</td>_x000D_
<td>20</td>_x000D_
<td>2011/08/14</td>_x000D_
<td>$163,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Michelle House</td>_x000D_
<td>Integration Specialist</td>_x000D_
<td>Sidney</td>_x000D_
<td>37</td>_x000D_
<td>2011/06/02</td>_x000D_
<td>$95,400</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Suki Burks</td>_x000D_
<td>Developer</td>_x000D_
<td>London</td>_x000D_
<td>53</td>_x000D_
<td>2009/10/22</td>_x000D_
<td>$114,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Prescott Bartlett</td>_x000D_
<td>Technical Author</td>_x000D_
<td>London</td>_x000D_
<td>27</td>_x000D_
<td>2011/05/07</td>_x000D_
<td>$145,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Gavin Cortez</td>_x000D_
<td>Team Leader</td>_x000D_
<td>San Francisco</td>_x000D_
<td>22</td>_x000D_
<td>2008/10/26</td>_x000D_
<td>$235,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Martena Mccray</td>_x000D_
<td>Post-Sales support</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>46</td>_x000D_
<td>2011/03/09</td>_x000D_
<td>$324,050</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Unity Butler</td>_x000D_
<td>Marketing Designer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>47</td>_x000D_
<td>2009/12/09</td>_x000D_
<td>$85,675</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Howard Hatfield</td>_x000D_
<td>Office Manager</td>_x000D_
<td>San Francisco</td>_x000D_
<td>51</td>_x000D_
<td>2008/12/16</td>_x000D_
<td>$164,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Hope Fuentes</td>_x000D_
<td>Secretary</td>_x000D_
<td>San Francisco</td>_x000D_
<td>41</td>_x000D_
<td>2010/02/12</td>_x000D_
<td>$109,850</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Vivian Harrell</td>_x000D_
<td>Financial Controller</td>_x000D_
<td>San Francisco</td>_x000D_
<td>62</td>_x000D_
<td>2009/02/14</td>_x000D_
<td>$452,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Timothy Mooney</td>_x000D_
<td>Office Manager</td>_x000D_
<td>London</td>_x000D_
<td>37</td>_x000D_
<td>2008/12/11</td>_x000D_
<td>$136,200</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jackson Bradshaw</td>_x000D_
<td>Director</td>_x000D_
<td>New York</td>_x000D_
<td>65</td>_x000D_
<td>2008/09/26</td>_x000D_
<td>$645,750</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Olivia Liang</td>_x000D_
<td>Support Engineer</td>_x000D_
<td>Singapore</td>_x000D_
<td>64</td>_x000D_
<td>2011/02/03</td>_x000D_
<td>$234,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Bruno Nash</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>London</td>_x000D_
<td>38</td>_x000D_
<td>2011/05/03</td>_x000D_
<td>$163,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Sakura Yamamoto</td>_x000D_
<td>Support Engineer</td>_x000D_
<td>Tokyo</td>_x000D_
<td>37</td>_x000D_
<td>2009/08/19</td>_x000D_
<td>$139,575</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Thor Walton</td>_x000D_
<td>Developer</td>_x000D_
<td>New York</td>_x000D_
<td>61</td>_x000D_
<td>2013/08/11</td>_x000D_
<td>$98,540</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Finn Camacho</td>_x000D_
<td>Support Engineer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>47</td>_x000D_
<td>2009/07/07</td>_x000D_
<td>$87,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Serge Baldwin</td>_x000D_
<td>Data Coordinator</td>_x000D_
<td>Singapore</td>_x000D_
<td>64</td>_x000D_
<td>2012/04/09</td>_x000D_
<td>$138,575</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Zenaida Frank</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>New York</td>_x000D_
<td>63</td>_x000D_
<td>2010/01/04</td>_x000D_
<td>$125,250</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Zorita Serrano</td>_x000D_
<td>Software Engineer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>56</td>_x000D_
<td>2012/06/01</td>_x000D_
<td>$115,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jennifer Acosta</td>_x000D_
<td>Junior Javascript Developer</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>43</td>_x000D_
<td>2013/02/01</td>_x000D_
<td>$75,650</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Cara Stevens</td>_x000D_
<td>Sales Assistant</td>_x000D_
<td>New York</td>_x000D_
<td>46</td>_x000D_
<td>2011/12/06</td>_x000D_
<td>$145,600</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Hermione Butler</td>_x000D_
<td>Regional Director</td>_x000D_
<td>London</td>_x000D_
<td>47</td>_x000D_
<td>2011/03/21</td>_x000D_
<td>$356,250</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Lael Greer</td>_x000D_
<td>Systems Administrator</td>_x000D_
<td>London</td>_x000D_
<td>21</td>_x000D_
<td>2009/02/27</td>_x000D_
<td>$103,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Jonas Alexander</td>_x000D_
<td>Developer</td>_x000D_
<td>San Francisco</td>_x000D_
<td>30</td>_x000D_
<td>2010/07/14</td>_x000D_
<td>$86,500</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Shad Decker</td>_x000D_
<td>Regional Director</td>_x000D_
<td>Edinburgh</td>_x000D_
<td>51</td>_x000D_
<td>2008/11/13</td>_x000D_
<td>$183,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Michael Bruce</td>_x000D_
<td>Javascript Developer</td>_x000D_
<td>Singapore</td>_x000D_
<td>29</td>_x000D_
<td>2011/06/27</td>_x000D_
<td>$183,000</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Donna Snider</td>_x000D_
<td>Customer Support</td>_x000D_
<td>New York</td>_x000D_
<td>27</td>_x000D_
<td>2011/01/25</td>_x000D_
<td>$112,000</td>_x000D_
</tr>_x000D_
</tbody>_x000D_
<tfoot>_x000D_
<tr>_x000D_
<th>Name</th>_x000D_
<th>Position</th>_x000D_
<th>Office</th>_x000D_
<th>Age</th>_x000D_
<th>Start date</th>_x000D_
<th>Salary</th>_x000D_
</tr>_x000D_
</tfoot>_x000D_
</table>As of v1.10.5 DataTables can also use initialization options read from HTML5 data-* attributes. This provides a mechanism for setting options directly in your HTML, rather than using Javascript.
Can anyone explain python's relative imports?
You are importing from package "sub". start.py is not itself in a package even if there is a __init__.py present.
You would need to start your program from one directory over parent.py:
./start.py
./pkg/__init__.py
./pkg/parent.py
./pkg/sub/__init__.py
./pkg/sub/relative.py
With start.py:
import pkg.sub.relative
Now pkg is the top level package and your relative import should work.
If you want to stick with your current layout you can just use import parent. Because you use start.py to launch your interpreter, the directory where start.py is located is in your python path. parent.py lives there as a separate module.
You can also safely delete the top level __init__.py, if you don't import anything into a script further up the directory tree.
Read a text file in R line by line
Here is the solution with a for loop. Importantly, it takes the one call to readLines out of the for loop so that it is not improperly called again and again. Here it is:
fileName <- "up_down.txt"
conn <- file(fileName,open="r")
linn <-readLines(conn)
for (i in 1:length(linn)){
print(linn[i])
}
close(conn)
Dependency Walker reports IESHIMS.DLL and WER.DLL missing?
I had this issue recently and I resolved it by simply rolling IE8 back to IE7.
My guess is that IE7 had these files as a wrapper for working on Windows XP, but IE8 was likely made to work with Vista/7 so it removed the files because the later editions just don't use the shim.
Disable/Enable Submit Button until all forms have been filled
Just add an else then:
function checkform()
{
var f = document.forms["theform"].elements;
var cansubmit = true;
for (var i = 0; i < f.length; i++) {
if (f[i].value.length == 0) cansubmit = false;
}
if (cansubmit) {
document.getElementById('submitbutton').disabled = false;
}
else {
document.getElementById('submitbutton').disabled = 'disabled';
}
}
Phonegap + jQuery Mobile, real world sample or tutorial
you may check this http://coenraets.org/blog/2011/10/sample-application-with-jquery-mobile-and-phonegap/ and you can also check http://mobile.tutsplus.com/category/tutorials/phonegap/ which provide you with a good sample
How do I show/hide a UIBarButtonItem?
One way to do it is use the initWithCustomView:(UIView *) property of when allocating the UIBarButtonItem. Subclass for UIView will have hide/unhide property.
For example:
1. Have a UIButton which you want to hide/unhide.
2. Make the UIButtonas the custom view. Like :
UIButton*myButton=[UIButton buttonWithType:UIButtonTypeRoundedRect];//your button
UIBarButtonItem*yourBarButton=[[UIBarButtonItem alloc] initWithCustomView:myButton];
3. You can hide/unhide the myButton you've created. [myButton setHidden:YES];
How do I watch a file for changes?
Check my answer to a similar question. You could try the same loop in Python. This page suggests:
import time
while 1:
where = file.tell()
line = file.readline()
if not line:
time.sleep(1)
file.seek(where)
else:
print line, # already has newline
Also see the question tail() a file with Python.
Restrict SQL Server Login access to only one database
this is to topup to what was selected as the correct answer. It has one missing step that when not done, the user will still be able to access the rest of the database. First, do as @DineshDB suggested
1. Connect to your SQL server instance using management studio
2. Goto Security -> Logins -> (RIGHT CLICK) New Login
3. fill in user details
4. Under User Mapping, select the databases you want the user to be able to access and configure
the missing step is below:
5. Under user mapping, ensure that "sysadmin" is NOT CHECKED and select "db_owner" as the role for the new user.
And thats it.
How to Apply Corner Radius to LinearLayout
Layout
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="300dp"
android:gravity="center"
android:layout_height="300dp"
android:layout_centerInParent="true"
android:background="@drawable/rounded_edge">
</LinearLayout>
Drawable folder rounded_edge.xml
<shape
xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="@android:color/darker_gray">
</solid>
<stroke
android:width="0dp"
android:color="#424242">
</stroke>
<corners
android:topLeftRadius="100dip"
android:topRightRadius="100dip"
android:bottomLeftRadius="100dip"
android:bottomRightRadius="100dip">
</corners>
</shape>
Get nth character of a string in Swift programming language
Best way which worked for me is:
var firstName = "Olivia"
var lastName = "Pope"
var nameInitials.text = "\(firstName.prefix(1))" + "\ (lastName.prefix(1))"
Output:"OP"
powerpoint loop a series of animation
Unfortunately you're probably done with the animation and presentation already. In the hopes this answer can help future questioners, however, this blog post has a walkthrough of steps that can loop a single slide as a sort of sub-presentation.
First, click Slide Show > Set Up Show.
Put a checkmark to Loop continuously until 'Esc'.
Click Ok. Now, Click Slide Show > Custom Shows. Click New.
Select the slide you are looping, click Add. Click Ok and Close.
Click on the slide you are looping. Click Slide Show > Slide Transition. Under Advance slide, put a checkmark to Automatically After. This will allow the slide to loop automatically. Do NOT Apply to all slides.
Right click on the thumbnail of the current slide, select Hide Slide.
Now, you will need to insert a new slide just before the slide you are looping. On the new slide, insert an action button. Set the hyperlink to the custom show you have created. Put a checkmark on "Show and Return"
This has worked for me.
How to access child's state in React?
If you already have onChange handler for the individual FieldEditors I don't see why you couldn't just move the state up to the FormEditor component and just pass down a callback from there to the FieldEditors that will update the parent state. That seems like a more React-y way to do it, to me.
Something along the line of this perhaps:
const FieldEditor = ({ value, onChange, id }) => {
const handleChange = event => {
const text = event.target.value;
onChange(id, text);
};
return (
<div className="field-editor">
<input onChange={handleChange} value={value} />
</div>
);
};
const FormEditor = props => {
const [values, setValues] = useState({});
const handleFieldChange = (fieldId, value) => {
setValues({ ...values, [fieldId]: value });
};
const fields = props.fields.map(field => (
<FieldEditor
key={field}
id={field}
onChange={handleFieldChange}
value={values[field]}
/>
));
return (
<div>
{fields}
<pre>{JSON.stringify(values, null, 2)}</pre>
</div>
);
};
// To add abillity to dynamically add/remove fields keep the list in state
const App = () => {
const fields = ["field1", "field2", "anotherField"];
return <FormEditor fields={fields} />;
};
Original - pre-hooks version:
class FieldEditor extends React.Component {_x000D_
constructor(props) {_x000D_
super(props);_x000D_
this.handleChange = this.handleChange.bind(this);_x000D_
}_x000D_
_x000D_
handleChange(event) {_x000D_
const text = event.target.value;_x000D_
this.props.onChange(this.props.id, text);_x000D_
}_x000D_
_x000D_
render() {_x000D_
return (_x000D_
<div className="field-editor">_x000D_
<input onChange={this.handleChange} value={this.props.value} />_x000D_
</div>_x000D_
);_x000D_
}_x000D_
}_x000D_
_x000D_
class FormEditor extends React.Component {_x000D_
constructor(props) {_x000D_
super(props);_x000D_
this.state = {};_x000D_
_x000D_
this.handleFieldChange = this.handleFieldChange.bind(this);_x000D_
}_x000D_
_x000D_
handleFieldChange(fieldId, value) {_x000D_
this.setState({ [fieldId]: value });_x000D_
}_x000D_
_x000D_
render() {_x000D_
const fields = this.props.fields.map(field => (_x000D_
<FieldEditor_x000D_
key={field}_x000D_
id={field}_x000D_
onChange={this.handleFieldChange}_x000D_
value={this.state[field]}_x000D_
/>_x000D_
));_x000D_
_x000D_
return (_x000D_
<div>_x000D_
{fields}_x000D_
<div>{JSON.stringify(this.state)}</div>_x000D_
</div>_x000D_
);_x000D_
}_x000D_
}_x000D_
_x000D_
// Convert to class component and add ability to dynamically add/remove fields by having it in state_x000D_
const App = () => {_x000D_
const fields = ["field1", "field2", "anotherField"];_x000D_
_x000D_
return <FormEditor fields={fields} />;_x000D_
};_x000D_
_x000D_
ReactDOM.render(<App />, document.body);Render HTML to an image
All the answers here use third party libraries while rendering HTML to an image can be relatively simple in pure Javascript. There is was even an article about it on the canvas section on MDN.
The trick is this:
- create an SVG with a foreignObject node containing your XHTML
- set the src of an image to the data url of that SVG
drawImageonto the canvas- set canvas data to target image.src
const {body} = document_x000D_
_x000D_
const canvas = document.createElement('canvas')_x000D_
const ctx = canvas.getContext('2d')_x000D_
canvas.width = canvas.height = 100_x000D_
_x000D_
const tempImg = document.createElement('img')_x000D_
tempImg.addEventListener('load', onTempImageLoad)_x000D_
tempImg.src = 'data:image/svg+xml,' + encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><foreignObject width="100%" height="100%"><div xmlns="http://www.w3.org/1999/xhtml"><style>em{color:red;}</style><em>I</em> lick <span>cheese</span></div></foreignObject></svg>')_x000D_
_x000D_
const targetImg = document.createElement('img')_x000D_
body.appendChild(targetImg)_x000D_
_x000D_
function onTempImageLoad(e){_x000D_
ctx.drawImage(e.target, 0, 0)_x000D_
targetImg.src = canvas.toDataURL()_x000D_
}Some things to note
- The HTML inside the SVG has to be XHTML
- For security reasons the SVG as data url of an image acts as an isolated CSS scope for the HTML since no external sources can be loaded. So a Google font for instance has to be inlined using a tool like this one.
- Even when the HTML inside the SVG exceeds the size of the image it wil draw onto the canvas correctly. But the actual height cannot be measured from that image. A fixed height solution will work just fine but dynamic height will require a bit more work. The best is to render the SVG data into an iframe (for isolated CSS scope) and use the resulting size for the canvas.
Arduino Tools > Serial Port greyed out
I had the same problem, with which I struggled for few days, reading all the blog posts, watching videos and finally after i changed my uno board, it worked perfectly well. But before I did that, there were a few things I tried, which I think also had an effect.
- Extracted the files to opt folder, change the preference --> behavior --> executable text files --> ask what to do. After that, double clicked arduino on the folder, selected run by terminal
- added user dialout like described in other answers.
Hope this answer helps you.
How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?
You can open the DevTools in Chrome with CTRL+I on Windows (or CMD+I Mac), and Firefox with F12, then select the Console tab), and check the XPath by typing $x("your_xpath_here").
This will return an array of matched values. If it is empty, you know there is no match on the page.
Firefox v66 (April 2019):
Chrome v69 (April 2019):
Execute a command line binary with Node.js
If you don't mind a dependency and want to use promises, child-process-promise works:
installation
npm install child-process-promise --save
exec Usage
var exec = require('child-process-promise').exec;
exec('echo hello')
.then(function (result) {
var stdout = result.stdout;
var stderr = result.stderr;
console.log('stdout: ', stdout);
console.log('stderr: ', stderr);
})
.catch(function (err) {
console.error('ERROR: ', err);
});
spawn usage
var spawn = require('child-process-promise').spawn;
var promise = spawn('echo', ['hello']);
var childProcess = promise.childProcess;
console.log('[spawn] childProcess.pid: ', childProcess.pid);
childProcess.stdout.on('data', function (data) {
console.log('[spawn] stdout: ', data.toString());
});
childProcess.stderr.on('data', function (data) {
console.log('[spawn] stderr: ', data.toString());
});
promise.then(function () {
console.log('[spawn] done!');
})
.catch(function (err) {
console.error('[spawn] ERROR: ', err);
});
Set the location in iPhone Simulator
In my delegate callback, I check to see if I'm running in a simulator (#if TARGET_ IPHONE_SIMULATOR) and if so, I supply my own, pre-looked-up, Lat/Long. To my knowledge, there's no other way.
generate days from date range
This solution uses no loops, procedures, or temp tables. The subquery generates dates for the last 10,000 days, and could be extended to go as far back or forward as you wish.
select a.Date
from (
select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date
from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as d
) a
where a.Date between '2010-01-20' and '2010-01-24'
Output:
Date
----------
2010-01-24
2010-01-23
2010-01-22
2010-01-21
2010-01-20
Notes on Performance
Testing it out here, the performance is surprisingly good: the above query takes 0.0009 sec.
If we extend the subquery to generate approx. 100,000 numbers (and thus about 274 years worth of dates), it runs in 0.0458 sec.
Incidentally, this is a very portable technique that works with most databases with minor adjustments.
How to set maximum height for table-cell?
This is what you want:
td {
max-height: whatever;
max-width: whatever;
overflow: hidden;
}
HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
This could also be an issue of building the code using a 64 bit configuration. You can try to select x86 as the build platform which can solve this issue. To do this right-click the solution and select Configuration Manager From there you can change the Platform of the project using the 32-bit .dll to x86
JQuery ajax call default timeout value
As an aside, when trying to diagnose a similar bug I realised that jquery's ajax error callback returns a status of "timeout" if it failed due to a timeout.
Here's an example:
$.ajax({
url: "/ajax_json_echo/",
timeout: 500,
error: function(jqXHR, textStatus, errorThrown) {
alert(textStatus); // this will be "timeout"
}
});
VBA Macro to compare all cells of two Excel files
Do NOT loop through all cells!! There is a lot of overhead in communications between worksheets and VBA, for both reading and writing. Looping through all cells will be agonizingly slow. I'm talking hours.
Instead, load an entire sheet at once into a Variant array. In Excel 2003, this takes about 2 seconds (and 250 MB of RAM). Then you can loop through it in no time at all.
In Excel 2007 and later, sheets are about 1000 times larger (1048576 rows × 16384 columns = 17 billion cells, compared to 65536 rows × 256 columns = 17 million in Excel 2003). You will run into an "Out of memory" error if you try to load the whole sheet into a Variant; on my machine I can only load 32 million cells at once. So you have to limit yourself to the range you know has actual data in it, or load the sheet bit by bit, e.g. 30 columns at a time.
Option Explicit
Sub test()
Dim varSheetA As Variant
Dim varSheetB As Variant
Dim strRangeToCheck As String
Dim iRow As Long
Dim iCol As Long
strRangeToCheck = "A1:IV65536"
' If you know the data will only be in a smaller range, reduce the size of the ranges above.
Debug.Print Now
varSheetA = Worksheets("Sheet1").Range(strRangeToCheck)
varSheetB = Worksheets("Sheet2").Range(strRangeToCheck) ' or whatever your other sheet is.
Debug.Print Now
For iRow = LBound(varSheetA, 1) To UBound(varSheetA, 1)
For iCol = LBound(varSheetA, 2) To UBound(varSheetA, 2)
If varSheetA(iRow, iCol) = varSheetB(iRow, iCol) Then
' Cells are identical.
' Do nothing.
Else
' Cells are different.
' Code goes here for whatever it is you want to do.
End If
Next iCol
Next iRow
End Sub
To compare to a sheet in a different workbook, open that workbook and get the sheet as follows:
Set wbkA = Workbooks.Open(filename:="C:\MyBook.xls")
Set varSheetA = wbkA.Worksheets("Sheet1") ' or whatever sheet you need
How do I read CSV data into a record array in NumPy?
I would suggest using tables (pip3 install tables). You can save your .csv file to .h5 using pandas (pip3 install pandas),
import pandas as pd
data = pd.read_csv("dataset.csv")
store = pd.HDFStore('dataset.h5')
store['mydata'] = data
store.close()
You can then easily, and with less time even for huge amount of data, load your data in a NumPy array.
import pandas as pd
store = pd.HDFStore('dataset.h5')
data = store['mydata']
store.close()
# Data in NumPy format
data = data.values
R: Plotting a 3D surface from x, y, z
You can use the function outer() to generate it.
Have a look at the demo for the function persp(), which is a base graphics function to draw perspective plots for surfaces.
Here is their first example:
x <- seq(-10, 10, length.out = 50)
y <- x
rotsinc <- function(x,y) {
sinc <- function(x) { y <- sin(x)/x ; y[is.na(y)] <- 1; y }
10 * sinc( sqrt(x^2+y^2) )
}
z <- outer(x, y, rotsinc)
persp(x, y, z)
The same applies to surface3d():
require(rgl)
surface3d(x, y, z)
Importing images from a directory (Python) to list or dictionary
from PIL import Image
import os, os.path
imgs = []
path = "/home/tony/pictures"
valid_images = [".jpg",".gif",".png",".tga"]
for f in os.listdir(path):
ext = os.path.splitext(f)[1]
if ext.lower() not in valid_images:
continue
imgs.append(Image.open(os.path.join(path,f)))
Good tutorial for using HTML5 History API (Pushstate?)
if jQuery is available, you could use jQuery BBQ
Twitter bootstrap modal-backdrop doesn't disappear
In .net MVC4 project I had the modal pop up (bootstrap 3.0) inside an Ajax.BeginForm( OnComplete = "addComplete" [extra code deleted]). Inside the "addComplete" javascript I had the following code. This solved my issue.
$('#moreLotDPModal').hide();
$("#moreLotDPModal").data('bs.modal').isShown = false;
$('body').removeClass('modal-open');
$('.modal-backdrop').remove();
$('#moreLotDPModal').removeClass("in");
$('#moreLotDPModal').attr('aria-hidden', "true");
How to use python numpy.savetxt to write strings and float number to an ASCII file?
The currently accepted answer does not actually address the question, which asks how to save lists that contain both strings and float numbers. For completeness I provide a fully working example, which is based, with some modifications, on the link given in @joris comment.
import numpy as np
names = np.array(['NAME_1', 'NAME_2', 'NAME_3'])
floats = np.array([ 0.1234 , 0.5678 , 0.9123 ])
ab = np.zeros(names.size, dtype=[('var1', 'U6'), ('var2', float)])
ab['var1'] = names
ab['var2'] = floats
np.savetxt('test.txt', ab, fmt="%10s %10.3f")
Update: This example also works properly in Python 3 by using the 'U6' Unicode string dtype, when creating the ab structured array, instead of the 'S6' byte string. The latter dtype would work in Python 2.7, but would write strings like b'NAME_1' in Python 3.
PowerShell on Windows 7: Set-ExecutionPolicy for regular users
If you (or a helpful admin) runs Set-ExecutionPolicy as administrator, the policy will be set for all users. (I would suggest "remoteSigned" rather than "unrestricted" as a safety measure.)
NB.: On a 64-bit OS you need to run Set-ExecutionPolicy for 32-bit and 64-bit PowerShell separately.
Performance differences between ArrayList and LinkedList
Ignore this answer for now. The other answers, particularly that of aix, are mostly correct. Over the long term they're the way to bet. And if you have enough data (on one benchmark on one machine, it seemed to be about one million entries) ArrayList and LinkedList do currently work as advertized. However, there are some fine points that apply in the early 21st century.
Modern computer technology seems, by my testing, to give an enormous edge to arrays. Elements of an array can be shifted and copied at insane speeds. As a result arrays and ArrayList will, in most practical situations, outperform LinkedList on inserts and deletes, often dramatically. In other words, ArrayList will beat LinkedList at its own game.
The downside of ArrayList is it tends to hang onto memory space after deletions, where LinkedList gives up space as it gives up entries.
The bigger downside of arrays and ArrayList is they fragment free memory and overwork the garbage collector. As an ArrayList expands, it creates new, bigger arrays, copies the old array to the new one, and frees the old one. Memory fills with big contiguous chunks of free memory that are not big enough for the next allocation. Eventually there's no suitable space for that allocation. Even though 90% of memory is free, no individual piece is big enough to do the job. The GC will work frantically to move things around, but if it takes too long to rearrange the space, it will throw an OutOfMemoryException. If it doesn't give up, it can still slow your program way down.
The worst of it is this problem can be hard to predict. Your program will run fine one time. Then, with a bit less memory available, with no warning, it slows or stops.
LinkedList uses small, dainty bits of memory and GC's love it. It still runs fine when you're using 99% of your available memory.
So in general, use ArrayList for smaller sets of data that are not likely to have most of their contents deleted, or when you have tight control over creation and growth. (For instance, creating one ArrayList that uses 90% of memory and using it without filling it for the duration of the program is fine. Continually creating and freeing ArrayList instances that use 10% of memory will kill you.) Otherwise, go with LinkedList (or a Map of some sort if you need random access). If you have very large collections (say over 100,000 elements), no concerns about the GC, and plan lots of inserts and deletes and no random access, run a few benchmarks to see what's fastest.
What does this error mean: "error: expected specifier-qualifier-list before 'type_name'"?
The compiler doesn't know that spe_context_ptr_t is a type. Check that the appropriate typedef is in scope when this code is compiled. You may have forgotten to include the appropriate header file.
JavaScript string and number conversion
These questions come up all the time due to JavaScript's typing system. People think they are getting a number when they're getting the string of a number.
Here are some things you might see that take advantage of the way JavaScript deals with strings and numbers. Personally, I wish JavaScript had used some symbol other than + for string concatenation.
Step (1) Concatenate "1", "2", "3" into "123"
result = "1" + "2" + "3";
Step (2) Convert "123" into 123
result = +"123";
Step (3) Add 123 + 100 = 223
result = 123 + 100;
Step (4) Convert 223 into "223"
result = "" + 223;
If you know WHY these work, you're less likely to get into trouble with JavaScript expressions.
.htaccess file to allow access to images folder to view pictures?
Having the .htaccess file on the root folder, add this line. Make sure to delete all other useless rules you tried before:
Options -Indexes
Or try:
Options All -Indexes
What does a question mark represent in SQL queries?
The ? is to allow Parameterized Query. These parameterized query is to allow type-specific value when replacing the ? with their respective value.
That's all to it.
Here's a reason of why it's better to use Parameterized Query. Basically, it's easier to read and debug.
Center button under form in bootstrap
Using Bootstrap, the correct way is to use the offset class. Use math to determine the left offset. Example: You want a button full width on mobile, but 1/3 width and centered on tablet, desktop, large desktop.
So out of 12 "bootstrap" columns, you're using 4 to offset, 4 for the button, then 4 is blank to the right.
See if that works!
Warning: mysqli_query() expects at least 2 parameters, 1 given. What?
The issue is that you're not saving the mysqli connection. Change your connect to:
$aVar = mysqli_connect('localhost','tdoylex1_dork','dorkk','tdoylex1_dork');
And then include it in your query:
$query1 = mysqli_query($aVar, "SELECT name1 FROM users
ORDER BY RAND()
LIMIT 1");
$aName1 = mysqli_fetch_assoc($query1);
$name1 = $aName1['name1'];
Also don't forget to enclose your connections variables as strings as I have above. This is what's causing the error but you're using the function wrong, mysqli_query returns a query object but to get the data out of this you need to use something like mysqli_fetch_assoc http://php.net/manual/en/mysqli-result.fetch-assoc.php to actually get the data out into a variable as I have above.
rename the columns name after cbind the data
A way of producing a data.frame and being able to do this in one line is to coerce all matrices/data frames passed to cbind into a data.frame while setting the column names attribute using setNames:
a = matrix(rnorm(10), ncol = 2)
b = matrix(runif(10), ncol = 2)
cbind(setNames(data.frame(a), c('n1', 'n2')),
setNames(data.frame(b), c('u1', 'u2')))
which produces:
n1 n2 u1 u2
1 -0.2731750 0.5030773 0.01538194 0.3775269
2 0.5177542 0.6550924 0.04871646 0.4683186
3 -1.1419802 1.0896945 0.57212043 0.9317578
4 0.6965895 1.6973815 0.36124709 0.2882133
5 0.9062591 1.0625280 0.28034347 0.7517128
Unfortunately, there is no for data frames that returns the matrix after the column names, however, there is nothing to stop you from adapting the code of setColNames function analogous to setNamessetNames to produce one:
setColNames <- function (object = nm, nm) {
colnames(object) <- nm
object
}
See this answer, the magrittr package contains functions for this.
python encoding utf-8
Unfortunately, the string.encode() method is not always reliable. Check out this thread for more information: What is the fool proof way to convert some string (utf-8 or else) to a simple ASCII string in python
How do I fix a merge conflict due to removal of a file in a branch?
I normally just run git mergetool and it will prompt me if I want to keep the modified file or keep it deleted. This is the quickest way IMHO since it's one command instead of several per file.
If you have a bunch of deleted files in a specific subdirectory and you want all of them to be resolved by deleting the files, you can do this:
yes d | git mergetool -- the/subdirectory
The d is provided to choose deleting each file. You can also use m to keep the modified file. Taken from the prompt you see when you run mergetool:
Use (m)odified or (d)eleted file, or (a)bort?
How to stretch a table over multiple pages
You should \usepackage{longtable}.
- PDF Documentation of the package: ftp://ftp.tex.ac.uk/tex-archive/macros/latex/required/tools/longtable.pdf
- Tutorial with examples can be found here.
Python | change text color in shell
This is so simple to do on a PC: Windows OS: Send the os a command to change the text: import os
os.system('color a') #green text
print 'I like green'
raw_input('do you?')
How to deal with INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES without uninstall?
Since the verification is based on package's name, you can change the package name inside your config.xml or manifest file for another name you want.
When publishing your app don't forget to change back the name!
Getting data from Yahoo Finance
As from the answer from BrianC use the YQL console. But after selecting the "Show Community Tables" go to the bottom of the tables list and expand yahoo where you find plenty of yahoo.finance tables:
Stock Quotes:
- yahoo.finance.quotes
- yahoo.finance.historicaldata
Fundamental analysis:
- yahoo.finance.keystats
- yahoo.finance.balancesheet
- yahoo.finance.incomestatement
- yahoo.finance.analystestimates
- yahoo.finance.dividendhistory
Technical analysis:
- yahoo.finance.historicaldata
- yahoo.finance.quotes
- yahoo.finance.quant
- yahoo.finance.option*
General financial information:
- yahoo.finance.industry
- yahoo.finance.sectors
- yahoo.finance.isin
- yahoo.finance.quoteslist
- yahoo.finance.xchange
2/Nov/2017: Yahoo finance has apparently killed this API, for more info and alternative resources see https://news.ycombinator.com/item?id=15616880
How do I update a Linq to SQL dbml file?
There are three ways to keep the model in sync.
Delete the modified tables from the designer, and drag them back onto the designer surface from the Database Explorer. I have found that, for this to work reliably, you have to:
a. Refresh the database schema in the Database Explorer (right-click, refresh)
b. Save the designer after deleting the tables
c. Save again after dragging the tables back.Note though that if you have modified any properties (for instance, turning off the child property of an association), this will obviously lose those modifications — you'll have to make them again.
Use SQLMetal to regenerate the schema from your database. I have seen a number of blog posts that show how to script this.
Make changes directly in the Properties pane of the DBML. This works for simple changes, like allowing nulls on a field.
The DBML designer is not installed by default in Visual Studio 2015, 2017 or 2019. You will have to close VS, start the VS installer and modify your installation. The LINQ to SQL tools is the feature you must install. For VS 2017/2019, you can find it under Individual Components > Code Tools.
How to format a numeric column as phone number in SQL
If you want to just format the output no need to create a new table or a function. In this scenario the area code was on a separate fields. I use field1, field2 just to illustrate you can select other fields in the same query:
area phone
213 8962102
Select statement:
Select field1, field2,areacode,phone,SUBSTR(tablename.areacode,1,3) + '-' + SUBSTR(tablename.phone,1,3) + '-' + SUBSTR(tablename.areacode,4,4) as Formatted Phone from tablename
Sample OUTPUT:
columns: FIELD1, FIELD2, AREA, PHONE, FORMATTED PHONE
data: Field1, Field2, 213, 8962102, 213-896-2102
How to create helper file full of functions in react native?
Quick note: You are importing a class, you can't call properties on a class unless they are static properties. Read more about classes here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes
There's an easy way to do this, though. If you are making helper functions, you should instead make a file that exports functions like this:
export function HelloChandu() {
}
export function HelloTester() {
}
Then import them like so:
import { HelloChandu } from './helpers'
or...
import functions from './helpers'
then
functions.HelloChandu
How do I use the ternary operator ( ? : ) in PHP as a shorthand for "if / else"?
You can do this even shorter by replacing echo with <?= code ?>
<?=(empty($storeData['street2'])) ? 'Yes <br />' : 'No <br />'?>
This is useful especially when you want to determine, inside a navbar, whether the menu option should be displayed as already visited (clicked) or not:
<li<?=($basename=='index.php' ? ' class="active"' : '')?>><a href="index.php">Home</a></li>
How to install Java SDK on CentOS?
Here is a detailed information on setting up Java and its paths on CentOS6.
Below steps are for the installation of latest Java version 8:
- Download java rpm package from Oracle site. (jdk-8-linux-x64.rpm)
- Install from the rpm. (rpm -Uvh jdk-8-linux-x64.rpm)
- Open /etc/profile, and set the java paths, save it.
- Check the java installation path, and java version, with the commands: which java, java -version
Now you can test the installation with a sample java program
How to convert a pymongo.cursor.Cursor into a dict?
I suggest create a list and append dictionary into it.
x = []
cur = db.dbname.find()
for i in cur:
x.append(i)
print(x)
Now x is a list of dictionary, you can manipulate the same in usual python way.
Get a DataTable Columns DataType
if (dr[dc.ColumnName].GetType().ToString() == "System.DateTime")
How to change visibility of layout programmatically
TextView view = (TextView) findViewById(R.id.textView);
view.setText("Add your text here");
view.setVisibility(View.VISIBLE);
Is it possible to run .php files on my local computer?
Sure you just need to setup a local web server. Check out XAMPP: http://www.apachefriends.org/en/xampp.html
That will get you up and running in about 10 minutes.
There is now a way to run php locally without installing a server: https://stackoverflow.com/a/21872484/672229
Yes but the files need to be processed. For example you can install test servers like mamp / lamp / wamp depending on your plateform.
Basically you need apache / php running.
How to position a div in bottom right corner of a browser?
I don't have IE8 to test this out, but I'm pretty sure it should work:
<div class="screen">
<!-- code -->
<div class="innerdiv">
text or other content
</div>
</div>
and the css:
.screen{
position: relative;
}
.innerdiv {
position: absolute;
bottom: 0;
right: 0;
}
This should place the .innerdiv in the bottom-right corner of the .screen class. I hope this helps :)
Get all LI elements in array
QuerySelectorAll will get all the matching elements with defined selector. Here on the example I've used element's name(li tag) to get all of the li present inside the div with navbar element.
let navbar = document_x000D_
.getElementById("navbar")_x000D_
.querySelectorAll('li');_x000D_
_x000D_
navbar.forEach((item, index) => {_x000D_
console.log({ index, item })_x000D_
}); _x000D_
<div id="navbar">_x000D_
<ul>_x000D_
<li id="navbar-One">One</li>_x000D_
<li id="navbar-Two">Two</li>_x000D_
<li id="navbar-Three">Three</li>_x000D_
<li id="navbar-Four">Four</li>_x000D_
<li id="navbar-Five">Five</li>_x000D_
</ul>_x000D_
</div>Xcode iOS 8 Keyboard types not supported
Xcode: 6.4 iOS:8 I got this error as well, but for a very different reason.
//UIKeyboardTypeNumberPad needs a "Done" button
UIBarButtonItem *doneBarButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone
target:self
action:@selector(doneBarButtonTapped:)];
enhancedNumpadToolbar = [[UIToolbar alloc]init]; // previously declared
[self.enhancedNumpadToolbar setItems:@[doneBarButton]];
self.myNumberTextField.inputAccessoryView = self.enhancedNumpadToolbar; //txf previously declared
I got the same error (save mine was "type 4" rather than "type 8"), until I discovered that I was missing this line:
[self.enhancedNumpadToolbar sizeToFit];
I added it, and the sun started shining, the birds resumed chirping, and all was well with the world.
PS You would also get such an error for other mischief, such as forgetting to alloc/init.
Breaking a list into multiple columns in Latex
I've had multenum for "Multi-column enumerated lists" recommended to me, but I've never actually used it myself, yet.
Edit: The syntax doesn't exactly look like you could easily copy+paste lists into the LaTeX code. So, it may not be the best solution for your use case!
Check whether an array is empty
<?php
if(empty($myarray))
echo"true";
else
echo "false";
?>
Horizontal scroll css?
Just make sure you add box-sizing:border-box; to your #myWorkContent.
Convert array of indices to 1-hot encoded numpy array
I am adding for completion a simple function, using only numpy operators:
def probs_to_onehot(output_probabilities):
argmax_indices_array = np.argmax(output_probabilities, axis=1)
onehot_output_array = np.eye(np.unique(argmax_indices_array).shape[0])[argmax_indices_array.reshape(-1)]
return onehot_output_array
It takes as input a probability matrix: e.g.:
[[0.03038822 0.65810204 0.16549407 0.3797123 ] ... [0.02771272 0.2760752 0.3280924 0.33458805]]
And it will return
[[0 1 0 0] ... [0 0 0 1]]
Weird behavior of the != XPath operator
I've always used this syntax, which yields more predictable results than using !=.
<xsl:when test="not($AccountNumber = '12345') and not($Balance = '0')" />
How can I sort generic list DESC and ASC?
without linq,
use Sort() and then Reverse() it.
How to manage a redirect request after a jQuery Ajax call
Additionally you will probably want to redirect user to the given in headers URL. So finally it will looks like this:
$.ajax({
//.... other definition
complete:function(xmlHttp){
if(xmlHttp.status.toString()[0]=='3'){
top.location.href = xmlHttp.getResponseHeader('Location');
}
});
UPD: Opps. Have the same task, but it not works. Doing this stuff. I'll show you solution when I'll find it.
How to make rectangular image appear circular with CSS
You can make it like that:
<html>
<head>
<style>
.round {
display:block;
width: 55px;
height: 55px;
border-radius: 50%;
overflow: hidden;
padding:5px 4px;
}
.round img {
width: 45px;
}
</style>
</head>
<body>
<div class="round">
<img src="image.jpg" />
</div>
</body>
Is JavaScript a pass-by-reference or pass-by-value language?
The most succinct explanation I found was in the AirBNB style guide:
Primitives: When you access a primitive type you work directly on its value
- string
- number
- boolean
- null
- undefined
E.g.:
var foo = 1,
bar = foo;
bar = 9;
console.log(foo, bar); // => 1, 9
Complex: When you access a complex type you work on a reference to its value
- object
- array
- function
E.g.:
var foo = [1, 2],
bar = foo;
bar[0] = 9;
console.log(foo[0], bar[0]); // => 9, 9
I.e. effectively primitive types are passed by value, and complex types are passed by reference.
React Native add bold or italics to single words in <Text> field
Bold text:
<Text>
<Text>This is a sentence</Text>
<Text style={{fontWeight: "bold"}}> with</Text>
<Text> one word in bold</Text>
</Text>
Italic text:
<Text>
<Text>This is a sentence</Text>
<Text style={{fontStyle: "italic"}}> with</Text>
<Text> one word in italic</Text>
</Text>
Appending a byte[] to the end of another byte[]
First you need to allocate an array of the combined length, then use arraycopy to fill it from both sources.
byte[] ciphertext = blah;
byte[] mac = blah;
byte[] out = new byte[ciphertext.length + mac.length];
System.arraycopy(ciphertext, 0, out, 0, ciphertext.length);
System.arraycopy(mac, 0, out, ciphertext.length, mac.length);
How do you find out the type of an object (in Swift)?
Swift 2.0:
The proper way to do this kind of type introspection would be with the Mirror struct,
let stringObject:String = "testing"
let stringArrayObject:[String] = ["one", "two"]
let viewObject = UIView()
let anyObject:Any = "testing"
let stringMirror = Mirror(reflecting: stringObject)
let stringArrayMirror = Mirror(reflecting: stringArrayObject)
let viewMirror = Mirror(reflecting: viewObject)
let anyMirror = Mirror(reflecting: anyObject)
Then to access the type itself from the Mirror struct you would use the property subjectType like so:
// Prints "String"
print(stringMirror.subjectType)
// Prints "Array<String>"
print(stringArrayMirror.subjectType)
// Prints "UIView"
print(viewMirror.subjectType)
// Prints "String"
print(anyMirror.subjectType)
You can then use something like this:
if anyMirror.subjectType == String.self {
print("anyObject is a string!")
} else {
print("anyObject is not a string!")
}
How to get POSTed JSON in Flask?
The following codes can be used:
@app.route('/api/add_message/<uuid>', methods=['GET', 'POST'])
def add_message(uuid):
content = request.json['text']
print content
return uuid
Here is a screenshot of me getting the json data:
You can see that what is returned is a dictionary type of data.
How do I write JSON data to a file?
json.dump(data, open('data.txt', 'wb'))
What is Mocking?
Prologue: If you look up the noun mock in the dictionary you will find that one of the definitions of the word is something made as an imitation.
Mocking is primarily used in unit testing. An object under test may have dependencies on other (complex) objects. To isolate the behavior of the object you want to replace the other objects by mocks that simulate the behavior of the real objects. This is useful if the real objects are impractical to incorporate into the unit test.
In short, mocking is creating objects that simulate the behavior of real objects.
At times you may want to distinguish between mocking as opposed to stubbing. There may be some disagreement about this subject but my definition of a stub is a "minimal" simulated object. The stub implements just enough behavior to allow the object under test to execute the test.
A mock is like a stub but the test will also verify that the object under test calls the mock as expected. Part of the test is verifying that the mock was used correctly.
To give an example: You can stub a database by implementing a simple in-memory structure for storing records. The object under test can then read and write records to the database stub to allow it to execute the test. This could test some behavior of the object not related to the database and the database stub would be included just to let the test run.
If you instead want to verify that the object under test writes some specific data to the database you will have to mock the database. Your test would then incorporate assertions about what was written to the database mock.
Python find min max and average of a list (array)
from __future__ import division
somelist = [1,12,2,53,23,6,17]
max_value = max(somelist)
min_value = min(somelist)
avg_value = 0 if len(somelist) == 0 else sum(somelist)/len(somelist)
If you want to manually find the minimum as a function:
somelist = [1,12,2,53,23,6,17]
def my_min_function(somelist):
min_value = None
for value in somelist:
if not min_value:
min_value = value
elif value < min_value:
min_value = value
return min_value
Python 3.4 introduced the statistics package, which provides mean and additional stats:
from statistics import mean, median
somelist = [1,12,2,53,23,6,17]
avg_value = mean(somelist)
median_value = median(somelist)
UIView with rounded corners and drop shadow?
You need to use use shadowView and roundView
shadowView
- Must has background color
- Should lay behind
roundView - The trick is to layout
shadowViewa bit inside, and its shadow needs to glow out. Adjust theinsetsso thatshadowViewis completely invisible behindroundView
roundView
- Must clips subviews
The code
addSubviews(shadowView, roundView)
roundView.addSubviews(titleLabel, subtitleLabel, imageView)
// need inset
shadowView.pinEdges(view: self, inset: UIEdgeInsets(constraintInsets: 2))
roundView.pinEdges(view: self)
do {
shadowView.backgroundColor = .white // need background
let layer = shadowView.layer
layer.shadowColor = UIColor.black.cgColor
layer.shadowRadius = 3
layer.shadowOffset = CGSize(width: 3, height: 3)
layer.shadowOpacity = 0.7
layer.shouldRasterize = true
}
do {
roundView.backgroundColor = .white
let layer = roundView.layer
layer.masksToBounds = true
layer.cornerRadius = 5
}
Or you can just do below without specifying clipToBounds/maskToBounds
layer.shadowColor = UIColor.gray.cgColor
layer.shadowOffset = CGSize(width: 3, height: 3)
layer.shadowOpacity = 0.8
How can I set the current working directory to the directory of the script in Bash?
Try the following simple one-liners:
For all UNIX/OSX/Linux
dir=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
Bash
dir=$(cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)
Note: A double dash (--) is used in commands to signify the end of command options, so files containing dashes or other special characters won't break the command.
Note: In Bash, use ${BASH_SOURCE[0]} in favor of $0, otherwise the path can break when sourcing it (source/.).
For Linux, Mac and other *BSD:
cd "$(dirname "$(realpath "$0")")";
Note: realpath should be installed in the most popular Linux distribution by default (like Ubuntu), but in some it can be missing, so you have to install it.
Note: If you're using Bash, use ${BASH_SOURCE[0]} in favor of $0, otherwise the path can break when sourcing it (source/.).
Otherwise you could try something like that (it will use the first existing tool):
cd "$(dirname "$(readlink -f "$0" || realpath "$0")")"
For Linux specific:
cd "$(dirname "$(readlink -f "$0")")"
Using GNU readlink on *BSD/Mac:
cd "$(dirname "$(greadlink -f "$0")")"
Note: You need to have coreutils installed
(e.g. 1. Install Homebrew, 2. brew install coreutils).
In bash
In bash you can use Parameter Expansions to achieve that, like:
cd "${0%/*}"
but it doesn't work if the script is run from the same directory.
Alternatively you can define the following function in bash:
realpath () {
[[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
This function takes 1 argument. If argument has already absolute path, print it as it is, otherwise print $PWD variable + filename argument (without ./ prefix).
or here is the version taken from Debian .bashrc file:
function realpath()
{
f=$@
if [ -d "$f" ]; then
base=""
dir="$f"
else
base="/$(basename "$f")"
dir=$(dirname "$f")
fi
dir=$(cd "$dir" && /bin/pwd)
echo "$dir$base"
}
Related:
How to detect the current directory in which I run my shell script?
Get the source directory of a Bash script from within the script itself
Reliable way for a Bash script to get the full path to itself
See also:
heroku - how to see all the logs
for WAR files:
I did not use github, instead I uploaded directly, a WAR file ( which I found to be much easier and faster ).
So the following helped me:
heroku logs --app appname
Hope it will help someone.
Use Excel pivot table as data source for another Pivot Table
You have to convert the pivot to values first before you can do that:
- Remove the subtotals
- Repeat the row items
- Copy / Paste values
- Insert a new pivot table
Undefined symbols for architecture x86_64 on Xcode 6.1
Check if that file is included in Build Phases -> Compiled Sources
Docker error response from daemon: "Conflict ... already in use by container"
Instead of command: docker run
You should use:
docker start **CONTAINER ID**
because the container is already exist
How do I calculate the percentage of a number?
$percentage = 50;
$totalWidth = 350;
$new_width = ($percentage / 100) * $totalWidth;
Keylistener in Javascript
A bit more readable comparing is done by casting event.key to upper case (I used onkeyup - needed the event to fire once upon each key tap):
window.onkeyup = function(event) {
let key = event.key.toUpperCase();
if ( key == 'W' ) {
// 'W' key is pressed
} else if ( key == 'D' ) {
// 'D' key is pressed
}
}
Each key has it's own code, get it out by outputting value of "key" variable (eg for arrow up key it will be 'ARROWUP' - (casted to uppercase))
Understanding Popen.communicate
Do not use communicate(input=""). It writes input to the process, closes its stdin and then reads all output.
Do it like this:
p=subprocess.Popen(["python","1st.py"],stdin=PIPE,stdout=PIPE)
# get output from process "Something to print"
one_line_output = p.stdout.readline()
# write 'a line\n' to the process
p.stdin.write('a line\n')
# get output from process "not time to break"
one_line_output = p.stdout.readline()
# write "n\n" to that process for if r=='n':
p.stdin.write('n\n')
# read the last output from the process "Exiting"
one_line_output = p.stdout.readline()
What you would do to remove the error:
all_the_process_will_tell_you = p.communicate('all you will ever say to this process\nn\n')[0]
But since communicate closes the stdout and stdin and stderr, you can not read or write after you called communicate.
Hashing a string with Sha256
Encoding.Unicode is Microsoft's misleading name for UTF-16 (a double-wide encoding, used in the Windows world for historical reasons but not used by anyone else). http://msdn.microsoft.com/en-us/library/system.text.encoding.unicode.aspx
If you inspect your bytes array, you'll see that every second byte is 0x00 (because of the double-wide encoding).
You should be using Encoding.UTF8.GetBytes instead.
But also, you will see different results depending on whether or not you consider the terminating '\0' byte to be part of the data you're hashing. Hashing the two bytes "Hi" will give a different result from hashing the three bytes "Hi". You'll have to decide which you want to do. (Presumably you want to do whichever one your friend's PHP code is doing.)
For ASCII text, Encoding.UTF8 will definitely be suitable. If you're aiming for perfect compatibility with your friend's code, even on non-ASCII inputs, you'd better try a few test cases with non-ASCII characters such as é and ? and see whether your results still match up. If not, you'll have to figure out what encoding your friend is really using; it might be one of the 8-bit "code pages" that used to be popular before the invention of Unicode. (Again, I think Windows is the main reason that anyone still needs to worry about "code pages".)
get list of pandas dataframe columns based on data type
As of pandas v0.14.1, you can utilize select_dtypes() to select columns by dtype
In [2]: df = pd.DataFrame({'NAME': list('abcdef'),
'On_Time': [True, False] * 3,
'On_Budget': [False, True] * 3})
In [3]: df.select_dtypes(include=['bool'])
Out[3]:
On_Budget On_Time
0 False True
1 True False
2 False True
3 True False
4 False True
5 True False
In [4]: mylist = list(df.select_dtypes(include=['bool']).columns)
In [5]: mylist
Out[5]: ['On_Budget', 'On_Time']
VB.NET: Clear DataGridView
Dim DS As New DataSet
DS.Clear() - DATASET clear works better than DataGridView.Rows.Clear() for me :
Public Sub doQuery(sql As String)
Try
DS.Clear() '<-- here
' - CONNECT -
DBCon.Open()
' Cmd gets SQL Query
Cmd = New OleDbCommand(sql, DBCon)
DA = New OleDbDataAdapter(Cmd)
DA.Fill(DS)
' - DISCONNECT -
DBCon.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
How to draw border around a UILabel?
UILabel properties borderColor,borderWidth,cornerRadius in Swift 4
@IBOutlet weak var anyLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
anyLabel.layer.borderColor = UIColor.black.cgColor
anyLabel.layer.borderWidth = 2
anyLabel.layer.cornerRadius = 5
anyLabel.layer.masksToBounds = true
}
How to cast int to enum in C++?
int i = 1;
Test val = static_cast<Test>(i);
List comprehension on a nested list?
I had a similar problem to solve so I came across this question. I did a performance comparison of Andrew Clark's and narayan's answer which I would like to share.
The primary difference between two answers is how they iterate over inner lists. One of them uses builtin map, while other is using list comprehension. Map function has slight performance advantage to its equivalent list comprehension if it doesn't require the use lambdas. So in context of this question map should perform slightly better than list comprehension.
Lets do a performance benchmark to see if it is actually true. I used python version 3.5.0 to perform all these tests. In first set of tests I would like to keep elements per list to be 10 and vary number of lists from 10-100,000
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,10))]*10]"
>>> 100000 loops, best of 3: 15.2 usec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*10]"
>>> 10000 loops, best of 3: 19.6 usec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,10))]*100]"
>>> 100000 loops, best of 3: 15.2 usec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*100]"
>>> 10000 loops, best of 3: 19.6 usec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,10))]*1000]"
>>> 1000 loops, best of 3: 1.43 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*1000]"
>>> 100 loops, best of 3: 1.91 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,10))]*10000]"
>>> 100 loops, best of 3: 13.6 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*10000]"
>>> 10 loops, best of 3: 19.1 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,10))]*100000]"
>>> 10 loops, best of 3: 164 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*100000]"
>>> 10 loops, best of 3: 216 msec per loop
In the next set of tests I would like to raise number of elements per lists to 100.
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,100))]*10]"
>>> 10000 loops, best of 3: 110 usec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,100))]*10]"
>>> 10000 loops, best of 3: 151 usec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,100))]*100]"
>>> 1000 loops, best of 3: 1.11 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,100))]*100]"
>>> 1000 loops, best of 3: 1.5 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,100))]*1000]"
>>> 100 loops, best of 3: 11.2 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,100))]*1000]"
>>> 100 loops, best of 3: 16.7 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,100))]*10000]"
>>> 10 loops, best of 3: 134 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,100))]*10000]"
>>> 10 loops, best of 3: 171 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,100))]*100000]"
>>> 10 loops, best of 3: 1.32 sec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,100))]*100000]"
>>> 10 loops, best of 3: 1.7 sec per loop
Lets take a brave step and modify the number of elements in lists to be 1000
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,1000))]*10]"
>>> 1000 loops, best of 3: 800 usec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,1000))]*10]"
>>> 1000 loops, best of 3: 1.16 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,1000))]*100]"
>>> 100 loops, best of 3: 8.26 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,1000))]*100]"
>>> 100 loops, best of 3: 11.7 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,1000))]*1000]"
>>> 10 loops, best of 3: 83.8 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,1000))]*1000]"
>>> 10 loops, best of 3: 118 msec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,1000))]*10000]"
>>> 10 loops, best of 3: 868 msec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,1000))]*10000]"
>>> 10 loops, best of 3: 1.23 sec per loop
>>> python -m timeit "[list(map(float,k)) for k in [list(range(0,1000))]*100000]"
>>> 10 loops, best of 3: 9.2 sec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,1000))]*100000]"
>>> 10 loops, best of 3: 12.7 sec per loop
From these test we can conclude that map has a performance benefit over list comprehension in this case. This is also applicable if you are trying to cast to either int or str. For small number of lists with less elements per list, the difference is negligible. For larger lists with more elements per list one might like to use map instead of list comprehension, but it totally depends on application needs.
However I personally find list comprehension to be more readable and idiomatic than map. It is a de-facto standard in python. Usually people are more proficient and comfortable(specially beginner) in using list comprehension than map.
Change image size via parent div
Actually using 100% will not make the image bigger if the image is smaller than the div size you specified. You need to set one of the dimensions, height or width in order to have all images fill the space. In my experience it's better to have the height set so each row is the same size, then all items wrap to next line properly. This will produce an output similar to fotolia.com (stock image website)
with css:
parent {
width: 42px; /* I took the width from your post and placed it in css */
height: 42px;
}
/* This will style any <img> element in .parent div */
.parent img {
height: 42px;
}
without:
<div style="height:42px;width:42px">
<img style="height:42px" src="http://someimage.jpg">
</div>
How can I use delay() with show() and hide() in Jquery
Why don't you try the fadeIn() instead of using a show() with delay(). I think what you are trying to do can be done with this. Here is the jQuery code for fadeIn and FadeOut() which also has inbuilt method for delaying the process.
$(document).ready(function(){
$('element').click(function(){
//effects take place in 3000ms
$('element_to_hide').fadeOut(3000);
$('element_to_show').fadeIn(3000);
});
}
Best Practice to Use HttpClient in Multithreaded Environment
With HttpClient 4.5 you can do this:
CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(new PoolingHttpClientConnectionManager()).build();
Note that this one implements Closeable (for shutting down of the connection manager).
Docker-Compose can't connect to Docker Daemon
in my case it is because the ubuntu permission,
- List item
check permission by
docker info
if they print problem permission,
then use
sudo chmod -R 777 /var/run/docker.sock
VBA Macro On Timer style to run code every set number of seconds, i.e. 120 seconds
Yes, you can use Application.OnTime for this and then put it in a loop. It's sort of like an alarm clock where you keep hittig the snooze button for when you want it to ring again. The following updates Cell A1 every three seconds with the time.
Dim TimerActive As Boolean
Sub StartTimer()
Start_Timer
End Sub
Private Sub Start_Timer()
TimerActive = True
Application.OnTime Now() + TimeValue("00:00:03"), "Timer"
End Sub
Private Sub Stop_Timer()
TimerActive = False
End Sub
Private Sub Timer()
If TimerActive Then
ActiveSheet.Cells(1, 1).Value = Time
Application.OnTime Now() + TimeValue("00:00:03"), "Timer"
End If
End Sub
You can put the StartTimer procedure in your Auto_Open event and change what is done in the Timer proceedure (right now it is just updating the time in A1 with ActiveSheet.Cells(1, 1).Value = Time).
Note: you'll want the code (besides StartTimer) in a module, not a worksheet module. If you have it in a worksheet module, the code requires slight modification.
Resize an Array while keeping current elements in Java?
Standard class java.util.ArrayList is resizable array, growing when new elements added.
How to Migrate to WKWebView?
Use some design patterns, you can mix UIWebView and WKWebView. The key point is to design a unique browser interface. But you should pay more attention to your app's current functionality, for example: if your app using NSURLProtocol to enhance network ability, using WKWebView you have no chance to do the same thing. Because NSURLProtocol only effects the current process, and WKWebView using muliti-process architecture, the networking staff is in a seperate process.
How can we convert an integer to string in AngularJs
.toString() is available, or just add "" to the end of the int
var x = 3,
toString = x.toString(),
toConcat = x + "";
Angular is simply JavaScript at the core.
Get visible items in RecyclerView
You can use recyclerView.getChildAt() to get each visible child, and setting some tag convertview.setTag(index) on these view in adapter code will help you to relate it with adapter data.
grep using a character vector with multiple patterns
Have you tried the match() or charmatch() functions?
Example use:
match(c("A1", "A9", "A6"), myfile$Letter)
Count rows with not empty value
Make another column that determines if the referenced cell is blank using the function "CountBlank". Then use count on the values created in the new "CountBlank" column.
Joining three tables using MySQL
Simply use:
select s.name "Student", c.name "Course"
from student s, bridge b, course c
where b.sid = s.sid and b.cid = c.cid
Javascript - get array of dates between 2 dates
I was recently working with moment.js, following did the trick..
function getDateRange(startDate, endDate, dateFormat) {
var dates = [],
end = moment(endDate),
diff = endDate.diff(startDate, 'days');
if(!startDate.isValid() || !endDate.isValid() || diff <= 0) {
return;
}
for(var i = 0; i < diff; i++) {
dates.push(end.subtract(1,'d').format(dateFormat));
}
return dates;
};
console.log(getDateRange(startDate, endDate, dateFormat));
Result would be:
["09/03/2015", "10/03/2015", "11/03/2015", "12/03/2015", "13/03/2015", "14/03/2015", "15/03/2015", "16/03/2015", "17/03/2015", "18/03/2015"]
How can I detect whether an iframe is loaded?
You can try onload event as well;
var createIframe = function (src) {
var self = this;
$('<iframe>', {
src: src,
id: 'iframeId',
frameborder: 1,
scrolling: 'no',
onload: function () {
self.isIframeLoaded = true;
console.log('loaded!');
}
}).appendTo('#iframeContainer');
};
getResources().getColor() is deprecated
It looks like the best approach is to use:
ContextCompat.getColor(context, R.color.color_name)
eg:
yourView.setBackgroundColor(ContextCompat.getColor(applicationContext,
R.color.colorAccent))
This will choose the Marshmallow two parameter method or the pre-Marshmallow method appropriately.
What is Join() in jQuery?
That's not a jQuery function - it's the regular Array.join function.
It converts an array to a string, putting the argument between each element.
Multiple files upload in Codeigniter
I change upload method with images[] according to @Denmark.
private function upload_files($path, $title, $files)
{
$config = array(
'upload_path' => $path,
'allowed_types' => 'jpg|gif|png',
'overwrite' => 1,
);
$this->load->library('upload', $config);
$images = array();
foreach ($files['name'] as $key => $image) {
$_FILES['images[]']['name']= $files['name'][$key];
$_FILES['images[]']['type']= $files['type'][$key];
$_FILES['images[]']['tmp_name']= $files['tmp_name'][$key];
$_FILES['images[]']['error']= $files['error'][$key];
$_FILES['images[]']['size']= $files['size'][$key];
$fileName = $title .'_'. $image;
$images[] = $fileName;
$config['file_name'] = $fileName;
$this->upload->initialize($config);
if ($this->upload->do_upload('images[]')) {
$this->upload->data();
} else {
return false;
}
}
return $images;
}
Finding version of Microsoft C++ compiler from command-line (for makefiles)
I had the same problem today. I needed to set a flag in a nmake Makefile if the cl compiler version is 15. Here is the hack I came up with:
!IF ([cl /? 2>&1 | findstr /C:"Version 15" > nul] == 0)
FLAG = "cl version 15"
!ENDIF
Note that cl /? prints the version information to the standard error stream and the help text to the standard output. To be able to check the version with the findstr command one must first redirect stderr to stdout using 2>&1.
The above idea can be used to write a Windows batch file that checks if the cl compiler version is <= a given number. Here is the code of cl_version_LE.bat:
@echo off
FOR /L %%G IN (10,1,%1) DO cl /? 2>&1 | findstr /C:"Version %%G" > nul && goto FOUND
EXIT /B 0
:FOUND
EXIT /B 1
Now if you want to set a flag in your nmake Makefile if the cl version <= 15, you can use:
!IF [cl_version_LE.bat 15]
FLAG = "cl version <= 15"
!ENDIF
docker error - 'name is already in use by container'
When you are building a new image you often want to run a new container each time and with the same name. I found the easiest way was to start the container with the --rm option:
--rm Automatically remove the container when it exits
e.g.
docker run --name my-micro-service --rm <image>
Sadly it's used almost randomly in the examples from the docs
Rename Pandas DataFrame Index
If you want to use the same mapping for renaming both columns and index you can do:
mapping = {0:'Date', 1:'SM'}
df.index.names = list(map(lambda name: mapping.get(name, name), df.index.names))
df.rename(columns=mapping, inplace=True)
'cout' was not declared in this scope
Put the following code before int main():
using namespace std;
And you will be able to use cout.
For example:
#include<iostream>
using namespace std;
int main(){
char t = 'f';
char *t1;
char **t2;
cout<<t;
return 0;
}
Now take a moment and read up on what cout is and what is going on here: http://www.cplusplus.com/reference/iostream/cout/
Further, while its quick to do and it works, this is not exactly a good advice to simply add using namespace std; at the top of your code. For detailed correct approach, please read the answers to this related SO question.
How to get old Value with onchange() event in text box
Maybe you can try to save the old value with the "onfocus" event to afterwards compare it with the new value with the "onchange" event.
Check if a key is down?
I don't believe there is anything like an isKeyDown function, but you could write your own.
Basically, create an array whose length is the number of keys you want to monitor. Then using the documents/pages/controls keyUp and keyDown events, update the array with that key's state.
Then write a function that checks if a certain key is down and returns a bool.
var keyEnum = { W_Key:0, A_Key:1, S_Key:2, D_Key:3 };
var keyArray = new Array(4);
function onKeyDown()
{
// Detect which key was pressed
if( key == 'w' )
keyArray[keyEnum.W_Key] = true;
// Repeat for each key you care about...
}
function onKeyUp()
{
// Detect which key was released
if( key == 'w' )
keyArray[keyEnum.W_Key] = false;
// Repeat for each key you care about...
}
function isKeyDown(key)
{
return keyArray[key];
}
That should accomplish what you want.
AES Encrypt and Decrypt
You can use CommonCrypto from iOS or CryptoSwift as external library. There are implementations with both tools below. That said, CommonCrypto output with AES should be tested, as it is not clear in CC documentation, which mode of AES it uses.
CommonCrypto in Swift 4.2
import CommonCrypto
func encrypt(data: Data) -> Data {
return cryptCC(data: data, key: key, operation: kCCEncrypt)
}
func decrypt(data: Data) -> Data {
return cryptCC(data: data, key: key, operation: kCCDecrypt)
}
private func cryptCC(data: Data, key: String operation: Int) -> Data {
guard key.count == kCCKeySizeAES128 else {
fatalError("Key size failed!")
}
var ivBytes: [UInt8]
var inBytes: [UInt8]
var outLength: Int
if operation == kCCEncrypt {
ivBytes = [UInt8](repeating: 0, count: kCCBlockSizeAES128)
guard kCCSuccess == SecRandomCopyBytes(kSecRandomDefault, ivBytes.count, &ivBytes) else {
fatalError("IV creation failed!")
}
inBytes = Array(data)
outLength = data.count + kCCBlockSizeAES128
} else {
ivBytes = Array(Array(data).dropLast(data.count - kCCBlockSizeAES128))
inBytes = Array(Array(data).dropFirst(kCCBlockSizeAES128))
outLength = inBytes.count
}
var outBytes = [UInt8](repeating: 0, count: outLength)
var bytesMutated = 0
guard kCCSuccess == CCCrypt(CCOperation(operation), CCAlgorithm(kCCAlgorithmAES128), CCOptions(kCCOptionPKCS7Padding), Array(key), kCCKeySizeAES128, &ivBytes, &inBytes, inBytes.count, &outBytes, outLength, &bytesMutated) else {
fatalError("Cryptography operation \(operation) failed")
}
var outData = Data(bytes: &outBytes, count: bytesMutated)
if operation == kCCEncrypt {
ivBytes.append(contentsOf: Array(outData))
outData = Data(bytes: ivBytes)
}
return outData
}
CryptoSwift v0.14 in Swift 4.2
enum Operation {
case encrypt
case decrypt
}
private let keySizeAES128 = 16
private let aesBlockSize = 16
func encrypt(data: Data, key: String) -> Data {
return crypt(data: data, key: key, operation: .encrypt)
}
func decrypt(data: Data, key: String) -> Data {
return crypt(data: data, key: key, operation: .decrypt)
}
private func crypt(data: Data, key: String, operation: Operation) -> Data {
guard key.count == keySizeAES128 else {
fatalError("Key size failed!")
}
var outData: Data? = nil
if operation == .encrypt {
var ivBytes = [UInt8](repeating: 0, count: aesBlockSize)
guard 0 == SecRandomCopyBytes(kSecRandomDefault, ivBytes.count, &ivBytes) else {
fatalError("IV creation failed!")
}
do {
let aes = try AES(key: Array(key.data(using: .utf8)!), blockMode: CBC(iv: ivBytes))
let encrypted = try aes.encrypt(Array(data))
ivBytes.append(contentsOf: encrypted)
outData = Data(bytes: ivBytes)
} catch {
print("Encryption error: \(error)")
}
} else {
let ivBytes = Array(Array(data).dropLast(data.count - aesBlockSize))
let inBytes = Array(Array(data).dropFirst(aesBlockSize))
do {
let aes = try AES(key: Array(key.data(using: .utf8)!), blockMode: CBC(iv: ivBytes))
let decrypted = try aes.decrypt(inBytes)
outData = Data(bytes: decrypted)
} catch {
print("Decryption error: \(error)")
}
}
return outData!
}
addEventListener vs onclick
As far as I know, the DOM "load" event still does only work very limited. That means it'll only fire for the window object, images and <script> elements for instance. The same goes for the direct onload assignment. There is no technical difference between those two. Probably .onload = has a better cross-browser availabilty.
However, you cannot assign a load event to a <div> or <span> element or whatnot.
Store List to session
YourListType ListName = (List<YourListType>)Session["SessionName"];
geom_smooth() what are the methods available?
The se argument from the example also isn't in the help or online documentation.
When 'se' in geom_smooth is set 'FALSE', the error shading region is not visible
When and how should I use a ThreadLocal variable?
[For Reference]ThreadLocal cannot solve update problems of shared object. It is recommended to use a staticThreadLocal object which is shared by all operations in the same thread. [Mandatory]remove() method must be implemented by ThreadLocal variables, especially when using thread pools in which threads are often reused. Otherwise, it may affect subsequent business logic and cause unexpected problems such as memory leak.
Property 'map' does not exist on type 'Observable<Response>'
Just write this command in the VS Code terminal of your project and restart the project.
npm install rxjs-compat
You need to import the map operator by adding this:
import 'rxjs/add/operator/map';
Removing array item by value
I am adding a second answer. I wrote a quick benchmarking script to try various methods here.
$arr = array(0 => 123456);
for($i = 1; $i < 500000; $i++) {
$arr[$i] = rand(0,PHP_INT_MAX);
}
shuffle($arr);
$arr2 = $arr;
$arr3 = $arr;
/**
* Method 1 - array_search()
*/
$start = microtime(true);
while(($key = array_search(123456,$arr)) !== false) {
unset($arr[$key]);
}
echo count($arr). ' left, in '.(microtime(true) - $start).' seconds<BR>';
/**
* Method 2 - basic loop
*/
$start = microtime(true);
foreach($arr2 as $k => $v) {
if ($v == 123456) {
unset($arr2[$k]);
}
}
echo count($arr2). 'left, in '.(microtime(true) - $start).' seconds<BR>';
/**
* Method 3 - array_keys() with search parameter
*/
$start = microtime(true);
$keys = array_keys($arr3,123456);
foreach($keys as $k) {
unset($arr3[$k]);
}
echo count($arr3). 'left, in '.(microtime(true) - $start).' seconds<BR>';
The third method, array_keys() with the optional search parameter specified, seems to be by far the best method. Output example:
499999 left, in 0.090957164764404 seconds
499999left, in 0.43156313896179 seconds
499999left, in 0.028877019882202 seconds
Judging by this, the solution I would use then would be:
$keysToRemove = array_keys($items,$id);
foreach($keysToRemove as $k) {
unset($items[$k]);
}
Loop in Jade (currently known as "Pug") template engine
Here is a very simple jade file that have a loop in it. Jade is very sensitive about white space. After loop definition line (for) you should give an indent(tab) to stuff that want to go inside the loop. You can do this without {}:
- var arr=['one', 'two', 'three'];
- var s = 'string';
doctype html
html
head
body
section= s
- for (var i=0; i<3; i++)
div= arr[i]
What is a superfast way to read large files line-by-line in VBA?
With that code you load the file in memory (as a big string) and then you read that string line by line.
By using Mid$() and InStr() you actually read the "file" twice but since it's in memory, there is no problem.
I don't know if VB's String has a length limit (probably not) but if the text files are hundreds of megabyte in size it's likely to see a performance drop, due to virtual memory usage.
How to get unique values in an array
These days, you can use ES6's Set data type to convert your array to a unique Set. Then, if you need to use array methods, you can turn it back into an Array:
var arr = ["a", "a", "b"];
var uniqueSet = new Set(arr); // {"a", "b"}
var uniqueArr = Array.from(uniqueSet); // ["a", "b"]
//Then continue to use array methods:
uniqueArr.join(", "); // "a, b"
DateTime to javascript date
You can try this in your Action:
return DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss");
And this in your Ajax success:
success: function (resultDateString) {
var date = new Date(resultDateString);
}
Or this in your View: (Javascript plus C#)
var date = new Date('@DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss")');
jQuery selector for the label of a checkbox
Thanks Kip, for those who may be looking to achieve the same using $(this) whilst iterating or associating within a function:
$("label[for="+$(this).attr("id")+"]").addClass( "orienSel" );
I looked for a while whilst working this project but couldn't find a good example so I hope this helps others who may be looking to resolve the same issue.
In the example above, my objective was to hide the radio inputs and style the labels to provide a slicker user experience (changing the orientation of the flowchart).
You can see an example here
If you like the example, here is the css:
.orientation { position: absolute; top: -9999px; left: -9999px;}
.orienlabel{background:#1a97d4 url('http://www.ifreight.solutions/process.html/images/icons/flowChart.png') no-repeat 2px 5px; background-size: 40px auto;color:#fff; width:50px;height:50px;display:inline-block; border-radius:50%;color:transparent;cursor:pointer;}
.orR{ background-position: 9px -57px;}
.orT{ background-position: 2px -120px;}
.orB{ background-position: 6px -177px;}
.orienSel {background-color:#323232;}
and the relevant part of the JavaScript:
function changeHandler() {
$(".orienSel").removeClass( "orienSel" );
if(this.checked) {
$("label[for="+$(this).attr("id")+"]").addClass( "orienSel" );
}
};
An alternate root to the original question, given the label follows the input, you could go with a pure css solution and avoid using JavaScript altogether...:
input[type=checkbox]:checked+label {}