Does Enter key trigger a click event?

For angular 6 there is a new way of doing it. On your input tag add

(keyup.enter)="keyUpFunction($event)"

Where keyUpFunction($event) is your function.

Oracle: how to UPSERT (update or insert into a table?)

I've been using the first code sample for years. Notice notfound rather than count.

UPDATE tablename SET val1 = in_val1, val2 = in_val2
    WHERE val3 = in_val3;
IF ( sql%notfound ) THEN
    INSERT INTO tablename
        VALUES (in_val1, in_val2, in_val3);
END IF;

The code below is the possibly new and improved code

MERGE INTO tablename USING dual ON ( val3 = in_val3 )
WHEN MATCHED THEN UPDATE SET val1 = in_val1, val2 = in_val2
WHEN NOT MATCHED THEN INSERT 
    VALUES (in_val1, in_val2, in_val3)

In the first example the update does an index lookup. It has to, in order to update the right row. Oracle opens an implicit cursor, and we use it to wrap a corresponding insert so we know that the insert will only happen when the key does not exist. But the insert is an independent command and it has to do a second lookup. I don't know the inner workings of the merge command but since the command is a single unit, Oracle could have execute the correct insert or update with a single index lookup.

I think merge is better when you do have some processing to be done that means taking data from some tables and updating a table, possibly inserting or deleting rows. But for the single row case, you may consider the first case since the syntax is more common.

Closing a file after File.Create

File.Create returns a FileStream object that you can call Close() on.

Include files from parent or other directory

If your server is not resolving the file from the parent directory using

include '../somefilein_parent.php'

try this (using the parent directory relative to the script):

include __DIR__ . "/../somefilein_parent.php";

Changing Jenkins build number

For multibranch pipeline projects, do this in the script console:

def project = Jenkins.instance.getItemByFullName("YourMultibranchPipelineProjectName")    
project.getAllJobs().each{ item ->   
    
    if(item.name == 'jobName'){ // master, develop, feature/......
      
      item.updateNextBuildNumber(#Number);
      item.saveNextBuildNumber();
      
      println('new build: ' + item.getNextBuildNumber())
    }
}

Amazon S3 direct file upload from client browser - private key disclosure

I have given a simple code to upload files from Javascript browser to AWS S3 and list the all files in S3 bucket.

Steps:

To know how to create Create IdentityPoolId http://docs.aws.amazon.com/cognito/latest/developerguide/identity-pools.html

Goto S3's console page and open cors configuration from bucket properties and write following XML code into that.

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
 <CORSRule>    
  <AllowedMethod>GET</AllowedMethod>
  <AllowedMethod>PUT</AllowedMethod>
  <AllowedMethod>DELETE</AllowedMethod>
  <AllowedMethod>HEAD</AllowedMethod>
  <AllowedHeader>*</AllowedHeader>
 </CORSRule>
</CORSConfiguration>

Create HTML file containing following code change the credentials, open file in browser and enjoy.

<script type="text/javascript">
 AWS.config.region = 'ap-north-1'; // Region
 AWS.config.credentials = new AWS.CognitoIdentityCredentials({
 IdentityPoolId: 'ap-north-1:*****-*****',
 });
 var bucket = new AWS.S3({
 params: {
 Bucket: 'MyBucket'
 }
 });

 var fileChooser = document.getElementById('file-chooser');
 var button = document.getElementById('upload-button');
 var results = document.getElementById('results');

 function upload() {
 var file = fileChooser.files[0];
 console.log(file.name);

 if (file) {
 results.innerHTML = '';
 var params = {
 Key: n + '.pdf',
 ContentType: file.type,
 Body: file
 };
 bucket.upload(params, function(err, data) {
 results.innerHTML = err ? 'ERROR!' : 'UPLOADED.';
 });
 } else {
 results.innerHTML = 'Nothing to upload.';
 }    }
</script>
<body>
 <input type="file" id="file-chooser" />
 <input type="button" onclick="upload()" value="Upload to S3">
 <div id="results"></div>
</body>

Altering a column to be nullable

Assuming SQL Server (based on your previous questions):

ALTER TABLE Merchant_Pending_Functions ALTER COLUMN NumberOfLocations INT NULL

Replace INT with your actual datatype.

Laravel 5.2 - pluck() method returns array

In the original example, why not use the select() method in your database query?

$name = DB::table('users')->where('name', 'John')->select("id");

This will be faster than using a PHP framework, for it'll utilize the SQL query to do the row selection for you. For ordinary collections, I don't believe this applies, but since you're using a database...

Larvel 5.3: Specifying a Select Clause

Add new row to excel Table (VBA)

I actually just found that if you want to add multiple rows below the selection in your table Selection.ListObject.ListRows.Add AlwaysInsert:=True works really well. I just duplicated the code five times to add five rows to my table

Formatting code in Notepad++

The latest plugin is tidy2, which can be installed through Plugins>Plugin Manager>Show Plugin Manager.

I suggest editing config 1 and setting quote-marks: no, especially if you have script that makes use of quotes.

Also, tidying more than once can result in inserting ampersands the first time and then replacing the ampersands the second time. You may want to play with the config to get it to where you need it.

Row count with PDO

I tried $count = $stmt->rowCount(); with Oracle 11.2 and it did not work. I decided to used a for loop as show below.

   $count =  "";
    $stmt =  $conn->prepare($sql);
    $stmt->execute();
   echo "<table border='1'>\n";
   while($row = $stmt->fetch(PDO::FETCH_OBJ)) {
        $count++;
        echo "<tr>\n";
    foreach ($row as $item) {
    echo "<td class='td2'>".($item !== null ? htmlentities($item, ENT_QUOTES):"&nbsp;")."</td>\n";
        } //foreach ends
        }// while ends
        echo "</table>\n";
       //echo " no of rows : ". oci_num_rows($stmt);
       //equivalent in pdo::prepare statement
       echo "no.of rows :".$count;

Running EXE with parameters

To start the process with parameters, you can use following code:

string filename = Path.Combine(cPath,"HHTCtrlp.exe");
var proc = System.Diagnostics.Process.Start(filename, cParams);

To kill/exit the program again, you can use following code:

proc.CloseMainWindow(); 
proc.Close();

How to force deletion of a python object?

The way to close resources are context managers, aka the with statement:

class Foo(object):

  def __init__(self):
    self.bar = None

  def __enter__(self):
    if self.bar != 'open':
      print 'opening the bar'
      self.bar = 'open'
    return self # this is bound to the `as` part

  def close(self):
    if self.bar != 'closed':
      print 'closing the bar'
      self.bar = 'close'

  def __exit__(self, *err):
    self.close()

if __name__ == '__main__':
  with Foo() as foo:
    print foo, foo.bar

output:

opening the bar
<__main__.Foo object at 0x17079d0> open
closing the bar

2) Python's objects get deleted when their reference count is 0. In your example the del foo removes the last reference so __del__ is called instantly. The GC has no part in this.

class Foo(object):

    def __del__(self):
        print "deling", self

if __name__ == '__main__':
    import gc
    gc.disable() # no gc
    f = Foo()
    print "before"
    del f # f gets deleted right away
    print "after"

output:

before
deling <__main__.Foo object at 0xc49690>
after

The gc has nothing to do with deleting your and most other objects. It's there to clean up when simple reference counting does not work, because of self-references or circular references:

class Foo(object):
    def __init__(self, other=None):
        # make a circular reference
        self.link = other
        if other is not None:
            other.link = self

    def __del__(self):
        print "deling", self

if __name__ == '__main__':
    import gc
    gc.disable()   
    f = Foo(Foo())
    print "before"
    del f # nothing gets deleted here
    print "after"
    gc.collect()
    print gc.garbage # The GC knows the two Foos are garbage, but won't delete
                     # them because they have a __del__ method
    print "after gc"
    # break up the cycle and delete the reference from gc.garbage
    del gc.garbage[0].link, gc.garbage[:]
    print "done"

output:

before
after
[<__main__.Foo object at 0x22ed8d0>, <__main__.Foo object at 0x22ed950>]
after gc
deling <__main__.Foo object at 0x22ed950>
deling <__main__.Foo object at 0x22ed8d0>
done

3) Lets see:

class Foo(object):
    def __init__(self):

        raise Exception

    def __del__(self):
        print "deling", self

if __name__ == '__main__':
    f = Foo()

gives:

Traceback (most recent call last):
  File "asd.py", line 10, in <module>
    f = Foo()
  File "asd.py", line 4, in __init__
    raise Exception
Exception
deling <__main__.Foo object at 0xa3a910>

Objects are created with __new__ then passed to __init__ as self. After a exception in __init__, the object will typically not have a name (ie the f = part isn't run) so their ref count is 0. This means that the object is deleted normally and __del__ is called.

Regular Expressions and negating a whole character group

In this case I might just simply avoid regular expressions altogether and go with something like:

if (StringToTest.IndexOf("ab") < 0)
  //do stuff

This is likely also going to be much faster (a quick test vs regexes above showed this method to take about 25% of the time of the regex method). In general, if I know the exact string I'm looking for, I've found regexes are overkill. Since you know you don't want "ab", it's a simple matter to test if the string contains that string, without using regex.

How to generate an openSSL key using a passphrase from the command line?

genrsa has been replaced by genpkey & when run manually in a terminal it will prompt for a password:

openssl genpkey -aes-256-cbc -algorithm RSA -out /etc/ssl/private/key.pem -pkeyopt rsa_keygen_bits:4096

However when run from a script the command will not ask for a password so to avoid the password being viewable as a process use a function in a shell script:

get_passwd() {
    local passwd=
    echo -ne "Enter passwd for private key: ? "; read -s passwd
    openssl genpkey -aes-256-cbc -pass pass:$passwd -algorithm RSA -out $PRIV_KEY -pkeyopt rsa_keygen_bits:$PRIV_KEYSIZE
}

How to create a cron job using Bash automatically without the interactive editor?

CRON="1 2 3 4 5 /root/bin/backup.sh" 
cat < (crontab -l) |grep -v "${CRON}" < (echo "${CRON}")

add -w parameter to grep exact command, without -w parameter adding the cronjob "testing" cause deletion of cron job "testing123"

script function to add/remove cronjobs. no duplication entries :

cronjob_editor () {         
# usage: cronjob_editor '<interval>' '<command>' <add|remove>

if [[ -z "$1" ]] ;then printf " no interval specified\n" ;fi
if [[ -z "$2" ]] ;then printf " no command specified\n" ;fi
if [[ -z "$3" ]] ;then printf " no action specified\n" ;fi

if [[ "$3" == add ]] ;then
    # add cronjob, no duplication:
    ( crontab -l | grep -v -F -w "$2" ; echo "$1 $2" ) | crontab -
elif [[ "$3" == remove ]] ;then
    # remove cronjob:
    ( crontab -l | grep -v -F -w "$2" ) | crontab -
fi 
} 
cronjob_editor "$1" "$2" "$3"

tested :

$ ./cronjob_editor.sh '*/10 * * * *' 'echo "this is a test" > export_file' add
$ crontab  -l
$ */10 * * * * echo "this is a test" > export_file

Displaying splash screen for longer than default seconds

Write sleep(5.0)

in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions for 5 seconds splash screen will be displayed

Default fetch type for one-to-one, many-to-one and one-to-many in Hibernate

To answer your question, Hibernate is an implementation of the JPA standard. Hibernate has its own quirks of operation, but as per the Hibernate docs

By default, Hibernate uses lazy select fetching for collections and lazy proxy fetching for single-valued associations. These defaults make sense for most associations in the majority of applications.

So Hibernate will always load any object using a lazy fetching strategy, no matter what type of relationship you have declared. It will use a lazy proxy (which should be uninitialized but not null) for a single object in a one-to-one or many-to-one relationship, and a null collection that it will hydrate with values when you attempt to access it.

It should be understood that Hibernate will only attempt to fill these objects with values when you attempt to access the object, unless you specify fetchType.EAGER.

Setting Different Bar color in matplotlib Python

Update pandas 0.17.0

@7stud's answer for the newest pandas version would require to just call

s.plot( 
    kind='bar', 
    color=my_colors,
)

instead of

pd.Series.plot(
    s, 
    kind='bar', 
    color=my_colors,
)

The plotting functions have become members of the Series, DataFrame objects and in fact calling pd.Series.plot with a color argument gives an error

Using request.setAttribute in a JSP page

No. Unfortunately the Request object is only available until the page finishes loading - once it's complete, you'll lose all values in it unless they've been stored somewhere.

If you want to persist attributes through requests you need to either:

Have a hidden input in your form, such as <input type="hidden" name="myhiddenvalue" value="<%= request.getParameter("value") %>" />. This will then be available in the servlet as a request parameter.
Put it in the session (see request.getSession() - in a JSP this is available as simply session)

I recommend using the Session as it's easier to manage.

What are all the uses of an underscore in Scala?

Here are some more examples where _ is used:

val nums = List(1,2,3,4,5,6,7,8,9,10)

nums filter (_ % 2 == 0)

nums reduce (_ + _)

nums.exists(_ > 5)

nums.takeWhile(_ < 8)

In all above examples one underscore represents an element in the list (for reduce the first underscore represents the accumulator)

Single TextView with multiple colored text

Try this:

mBox = new TextView(context);
mBox.setText(Html.fromHtml("<b>" + title + "</b>" +  "<br />" + 
      "<small>" + description + "</small>" + "<br />" + 
      "<small>" + DateAdded + "</small>"));

Git Bash: Could not open a connection to your authentication agent

Try using cygwin instead of bash. that worked for me

Is Eclipse the best IDE for Java?

Let me just start out by saying that Eclipse is a fantastic IDE for Java and many other languages. Its plugin architecture and its extensibility are hard to rival and the fact that it's free is a huge plus for smaller teams or tight budgets.

A few things that I hate about Eclipse.

The documentation is really lacking. I don't know who writes the stuff, but if it's not just flatly missing, it's incomplete. If it's not incomplete, then it's just flat out wrong. I have wasted many precious hours trying to use a given feature in Eclipse by walking through its documentation only to discover that it was all trash to begin with.
Despite the size of the project, I have found the community to be very lacking and/or confusing enough to be hard to participate in. I have tried several times to get help on a particular subject or plugin only to be sent to 3 or 4 different newsgroups who all point to the other newsgroup or just plain don't respond. This can be very frustrating, as much smaller open source products that I use are really good about answering questions I have. Perhaps it's simply a function of the size of the community.
If you need functionality beyond the bundled functionality of one of their distros (for instance, the Eclipse for Java EE Developers distro which bundles things like the WTP), I have found the installation process for extra plugins excruciatingly painful. I don't know why they can't make that process simpler (or maybe I'm just spoiled on my Mac at home and don't know how bad it really is out in the 'real' world) but if I'm not just unsuccessful, oftentimes it's a process of multiple hours to get a new plugin installed. This was supposedly one of their goals in 3.4 (to make installation of new projects simpler); if they succeeded, I can't tell.
Documentation in the form of books and actual tutorials is sorely lacking. I want a master walkthrough for something as dense and feature-rich as Eclipse; something that says, 'hey, did you know about this feature and how it can really make you more productive?'. As far as I've found, nothing like that exists. If you want to figure out Eclipse, you've got one option, sit down and play with it (literally play with it, not just see a feature and go and read the documentation for it, because that probably doesn't exist or is wrong).

Despite these things, Eclipse really is a great IDE. Its refactoring tooling works tremendously well. The handling of Javadoc works perfectly. All of features we've come to expect of an IDE are their (code completion, templates, integration with various SCMSs, integration with build systems). Its code formatting and cleanup tools are very powerful. I find its build system to work well and intuitively. I think these are the things upon which its reputation is really built.

I don't have enough experience with other IDEs or with other distros of Eclipse (I've seen RAD at work quite a few times; I can't believe anyone would pay what they're charging for that) to comment on them, but I've been quite happy with Eclipse for the most part. One tip I have heard from multiple places is that if you want Eclipse without a lot of the hassle that can come with its straight install, go with a for-pay distro of it. My Eclipse is a highly recommended version that I've seen all over the net that is really very affordable (last I heard, $50 for the distro plus a year of free upgrades). If you have the budget and need the added functionality, I'd go with something like that.

Anyway, I've tried to be as detailed as I can. I hope this helps and good luck on your search! :)

How to set a value for a span using jQuery

You are using jQuery(document).ready(function($) {} means here you are using jQuery instead of $. So to resolve your issue use following code.

jQuery("#submittername").text(submitter_name);

This will resolve your problem.

Better/Faster to Loop through set or list?

Just use a set. Its semantics are exactly what you want: a collection of unique items.

Technically you'll be iterating through the list twice: once to create the set, once for your actual loop. But you'd be doing just as much work or more with any other approach.

How to create empty text file from a batch file?

fsutil file createnew file.cmd 0

How can I escape a double quote inside double quotes?

I don't know why this old issue popped up today in the Bash tagged listings, but just in case for future researchers, keep in mind that you can avoid escaping by using ASCII codes of the chars you need to echo.

Example:

 echo -e "This is \x22\x27\x22\x27\x22text\x22\x27\x22\x27\x22"
 This is "'"'"text"'"'"

\x22 is the ASCII code (in hex) for double quotes and \x27 for single quotes. Similarly you can echo any character.

I suppose if we try to echo the above string with backslashes, we will need a messy two rows backslashed echo... :)

For variable assignment this is the equivalent:

 $ a=$'This is \x22text\x22'
 $ echo "$a"
 This is "text"

If the variable is already set by another program, you can still apply double/single quotes with sed or similar tools.

Example:

 $ b="Just another text here"
 $ echo "$b"
 Just another text here
 $ sed 's/text/"'\0'"/' <<<"$b" #\0 is a special sed operator
 Just another "0" here #this is not what i wanted to be
 $ sed 's/text/\x22\x27\0\x27\x22/' <<<"$b"
 Just another "'text'" here #now we are talking. You would normally need a dozen of backslashes to achieve the same result in the normal way.

C# find highest array value and index

 public static class ArrayExtensions
{
    public static int MaxIndexOf<T>(this T[] input)
    {
        var max = input.Max();
        int index = Array.IndexOf(input, max);
        return index;
    }
}

This works for all variable types...

var array = new int[]{1, 2, 4, 10, 0, 2};
var index = array.MaxIndexOf();


var array = new double[]{1.0, 2.0, 4.0, 10.0, 0.0, 2.0};
var index = array.MaxIndexOf();

Bootstrap Modal sitting behind backdrop

I had a similar problem that the fade was not working and the overlay stayed on the page. I had dynamic content added back to the page (refresh on some content only on modal action). I also had this $('#rejectModal-'+itemId).modal('hide') (itemId is dynamic id for multiple modals in a single page for rejecting some information) but the problem was still not gone.

The overlay was staying because my layout was not set to null in the partial view After setting this the problem was gone:

@{ 
    Layout = null;
}

How to get the max of two values in MySQL?

You can use GREATEST function with not nullable fields. If one of this values (or both) can be NULL, don't use it (result can be NULL).

select 
    if(
        fieldA is NULL, 
        if(fieldB is NULL, NULL, fieldB), /* second NULL is default value */
        if(fieldB is NULL, field A, GREATEST(fieldA, fieldB))
    ) as maxValue

You can change NULL to your preferred default value (if both values is NULL).

Loop through JSON in EJS

JSON.stringify returns a String. So, for example:

var data = [
    { id: 1, name: "bob" },
    { id: 2, name: "john" },
    { id: 3, name: "jake" },
];

JSON.stringify(data)

will return the equivalent of:

"[{\"id\":1,\"name\":\"bob\"},{\"id\":2,\"name\":\"john\"},{\"id\":3,\"name\":\"jake\"}]"

as a String value.

So when you have

<% for(var i=0; i<JSON.stringify(data).length; i++) {%>

what that ends up looking like is:

<% for(var i=0; i<"[{\"id\":1,\"name\":\"bob\"},{\"id\":2,\"name\":\"john\"},{\"id\":3,\"name\":\"jake\"}]".length; i++) {%>

which is probably not what you want. What you probably do want is something like this:

<table>
<% for(var i=0; i < data.length; i++) { %>
   <tr>
     <td><%= data[i].id %></td>
     <td><%= data[i].name %></td>
   </tr>
<% } %>
</table>

This will output the following table (using the example data from above):

<table>
  <tr>
    <td>1</td>
    <td>bob</td>
  </tr>
  <tr>
    <td>2</td>
    <td>john</td>
  </tr>
  <tr>
    <td>3</td>
    <td>jake</td>
  </tr>
</table>

iOS9 Untrusted Enterprise Developer with no option to trust

Changes to Enterprise App Distribution Coming in iOS 9

iOS 9 introduces a new feature to help protect users from installing in-house apps from untrusted sources. While no new app signing or provisioning methods are required, the way your enterprise users manage in-house apps installed on their iOS 9 devices will change.

In-house apps installed using an MDM solution are explicitly trusted and will no longer prompt the user to trust the developer that signed and provisioned the app. If your enterprise app does not use an MDM solution, users who install your app for the first time will be prompted to trust the developer. All users who install your app for the first time will need an internet connection.

Using a new restriction, organizations can limit the apps installed on their devices to the in-house apps that they create. And a new interface in Settings allows users to see all enterprise apps installed from their organization.

Source: Official email sent from [email protected] to existing enterprise app developers.

reading and parsing a TSV file, then manipulating it for saving as CSV (efficiently)

You should use the csv module to read the tab-separated value file. Do not read it into memory in one go. Each row you read has all the information you need to write rows to the output CSV file, after all. Keep the output file open throughout.

import csv

with open('sample.txt', newline='') as tsvin, open('new.csv', 'w', newline='') as csvout:
    tsvin = csv.reader(tsvin, delimiter='\t')
    csvout = csv.writer(csvout)

    for row in tsvin:
        count = int(row[4])
        if count > 0:
            csvout.writerows([row[2:4] for _ in range(count)])

or, using the itertools module to do the repeating with itertools.repeat():

from itertools import repeat
import csv

with open('sample.txt', newline='') as tsvin, open('new.csv', 'w', newline='') as csvout:
    tsvin = csv.reader(tsvin, delimiter='\t')
    csvout = csv.writer(csvout)

    for row in tsvin:
        count = int(row[4])
        if count > 0:
            csvout.writerows(repeat(row[2:4], count))

Media Player called in state 0, error (-38,0)

mp = new MediaPlayer();
AssetFileDescriptor afd = mContext.getAssets().openFd(fileName);
mp.reset();
mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
mp.prepare();
mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
  public void onPrepared(MediaPlayer mp) {
    mp.start();
  }
});

mp.prepareAsync();

Escape a string for a sed replace pattern

Based on Pianosaurus's regular expressions, I made a bash function that escapes both keyword and replacement.

function sedeasy {
  sed -i "s/$(echo $1 | sed -e 's/\([[\/.*]\|\]\)/\\&/g')/$(echo $2 | sed -e 's/[\/&]/\\&/g')/g" $3
}

Here's how you use it:

sedeasy "include /etc/nginx/conf.d/*" "include /apps/*/conf/nginx.conf" /etc/nginx/nginx.conf

"FATAL: Module not found error" using modprobe

Insert this in your Makefile

 $(MAKE) -C $(KDIR) M=$(PWD) modules_install                      

 it will install the module in the directory /lib/modules/<var>/extra/
 After make , insert module with modprobe module_name (without .ko extension)

After your normal make, you copy module module_name.ko into   directory  /lib/modules/<var>/extra/

then do modprobe module_name (without .ko extension)

DataGridView - how to set column width?

You can use the DataGridViewColumn.Width property to do it:

DataGridViewColumn column = dataGridView.Columns[0];
column.Width = 60;

http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcolumn.width.aspx

Creating and throwing new exception

To call a specific exception such as FileNotFoundException use this format

if (-not (Test-Path $file)) 
{
    throw [System.IO.FileNotFoundException] "$file not found."
}

To throw a general exception use the throw command followed by a string.

throw "Error trying to do a task"

When used inside a catch, you can provide additional information about what triggered the error

How to connect to LocalDB in Visual Studio Server Explorer?

The fastest way in Visual Studio 2017 is to go to Tools -> SQL Server -> New query.. Choose from Local databases and choose the desired Database name at the bottom.

Alternative way

Visual Studio 2017 Server name is:

(localdb)\MSSQLLocalDB

Add the new connection using menu Tools -> Connect to Database...

ImportError: No module named tensorflow

This Worked for me:

$ sudo easy_install pip
$ sudo easy_install --upgrade six
$ export TF_BINARY_URL=https://storage.googleapis.com/tensorflow/mac/tensorflow-0.9.0-py2-none-any.whl
$ sudo pip install --upgrade $TF_BINARY_URL

Finding repeated words on a string and counting the repetitions

import java.util.HashMap;
import java.util.Scanner;
public class class1 {
public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String inpStr = in.nextLine();
    int key;

    HashMap<String,Integer> hm = new HashMap<String,Integer>();
    String[] strArr = inpStr.split(" ");

    for(int i=0;i<strArr.length;i++){
        if(hm.containsKey(strArr[i])){
            key = hm.get(strArr[i]);
            hm.put(strArr[i],key+1);

        }
        else{
            hm.put(strArr[i],1);
        }   
    }
    System.out.println(hm);
}

}

How to convert String to long in Java?

public class StringToLong {

   public static void main (String[] args) {

      // String s = "fred";    // do this if you want an exception

      String s = "100";

      try {
         long l = Long.parseLong(s);
         System.out.println("long l = " + l);
      } catch (NumberFormatException nfe) {
         System.out.println("NumberFormatException: " + nfe.getMessage());
      }

   }
}

Wait for all promises to resolve

You can use "await" in an "async function".

app.controller('MainCtrl', async function($scope, $q, $timeout) {
  ...
  var all = await $q.all([one.promise, two.promise, three.promise]); 
  ...
}

NOTE: I'm not 100% sure you can call an async function from a non-async function and have the right results.

That said this wouldn't ever be used on a website. But for load-testing/integration test...maybe.

Example code:

_x000D_

async function waitForIt(printMe) {_x000D_
  console.log(printMe);_x000D_
  console.log("..."+await req());_x000D_
  console.log("Legendary!")_x000D_
}_x000D_
_x000D_
function req() {_x000D_
  _x000D_
  var promise = new Promise(resolve => {_x000D_
    setTimeout(() => {_x000D_
      resolve("DARY!");_x000D_
    }, 2000);_x000D_
    _x000D_
  });_x000D_
_x000D_
    return promise;_x000D_
}_x000D_
_x000D_
waitForIt("Legen-Wait For It");

_x000D_

How do I trim whitespace from a string?

You want strip():

myphrases = [" Hello ", " Hello", "Hello ", "Bob has a cat"]

for phrase in myphrases:
    print(phrase.strip())

ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)

Try dont shut down iptables and open port 3306.

sudo iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT

or sudo ufw allow 3306 if you use ufw.

check: netstat -lnp | grep mysql you should get sth like that:

cp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      2048/mysqld         
tcp6       0      0 :::33060                :::*                    LISTEN      2048/mysqld         
unix  2      [ ACC ]     STREAM     LISTENING     514961   2048/mysqld          /var/run/mysqld/mysqld.sock
unix  2      [ ACC ]     STREAM     LISTENING     514987   2048/mysqld          /var/run/mysqld/mysqlx.sock

if you have null then delete # before port = 3306 in cnf file.

Where is my .vimrc file?

I'd like to share how I set showing the line number as the default on Mac.

In a terminal, type cd. This will help you go to the home folder.
In the terminal, type vi .vimrc. This will create an empty vimrc system file which you want to use.
In the file, type set number, and then hit Esc on the keyboard and type in :wq. This will set the line number shown in the default setting file vimrc and save it.
vi something to see if this works. If not, try to restart the terminal completely.

If in a terminal, type in cd /usr/share/vim/, go to that folder, and type in ls. You can directly see a file named vimrc. But it's a system file that says read only. I feel it's not a good idea to try modify it. So following the above steps to create a vimrc by yourself is better. It worked for me.

How can I show an element that has display: none in a CSS rule?

try setting the display to block in your javascript instead of a blank value.

How to disable spring security for particular url

<http pattern="/resources/**" security="none"/>

Or with Java configuration:

web.ignoring().antMatchers("/resources/**");

Instead of the old:

 <intercept-url pattern="/resources/**" filters="none"/>

for exp . disable security for a login page :

  <intercept-url pattern="/login*" filters="none" />

python - if not in list

You better do this syntax

if not (item in mylist):  
    Code inside the if

Table fixed header and scrollable body

put the table inside the div like this to make scrollable table vertically. change overflow-yto overflow-x to make table scrollable horizontally. just overflow to make table scrollable both horizontal and vertical.

<div style="overflow-y: scroll;"> 
    <table>
    ...
    </table>
</div>

What does cherry-picking a commit with Git mean?

Python: Passing variables between functions

return returns a value. It doesn't matter what name you gave to that value. Returning it just "passes it out" so that something else can use it. If you want to use it, you have to grab it from outside:

lst = defineAList()
useTheList(lst)

Returning list from inside defineAList doesn't mean "make it so the whole rest of the program can use that variable". It means "pass this variable out and give the rest of the program one chance to grab it and use it". You need to assign that value to something outside the function in order to make use of it. Also, because of this, there is no need to define your list ahead of time with list = []. Inside defineAList, you create a new list and return it; this list has no relationship to the one you defined with list = [] at the beginning.

Incidentally, I changed your variable name from list to lst. It's not a good idea to use list as a variable name because that is already the name of a built-in Python type. If you make your own variable called list, you won't be able to access the builtin one anymore.

Java ArrayList of Arrays?

Since the size of your string array is fixed at compile time, you'd be better off using a structure (like Pair) that mandates exactly two fields, and thus avoid the runtime errors possible with the array approach.

Code:

Since Java doesn't supply a Pair class, you'll need to define your own.

class Pair<A, B> {
  public final A first;
  public final B second;

  public Pair(final A first, final B second) {
    this.first = first;
    this.second = second;
  }

  //
  // Override 'equals', 'hashcode' and 'toString'
  //
}

and then use it as:

List<Pair<String, String>> action = new ArrayList<Pair<String, String>>();

[ Here I used List because it's considered a good practice to program to interfaces. ]

Why does modern Perl avoid UTF-8 by default?

While reading this thread, I often get the impression that people are using "UTF-8" as a synonym to "Unicode". Please make a distinction between Unicode's "Code-Points" which are an enlarged relative of the ASCII code and Unicode's various "encodings". And there are a few of them, of which UTF-8, UTF-16 and UTF-32 are the current ones and a few more are obsolete.

Please, UTF-8 (as well as all other encodings) exists and have meaning in input or in output only. Internally, since Perl 5.8.1, all strings are kept as Unicode "Code-points". True, you have to enable some features as admiringly covered previously.

Sort an ArrayList based on an object field

Modify the DataNode class so that it implements Comparable interface.

public int compareTo(DataNode o)
{
     return(degree - o.degree);
}

then just use

Collections.sort(nodeList);

Using ExcelDataReader to read Excel data starting from a particular cell

public static DataTable ConvertExcelToDataTable(string filePath, bool isXlsx = false)
{
    System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
    //open file and returns as Stream
        using (var stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
        {
                using (var reader = ExcelReaderFactory.CreateReader(stream))
                {

                    var conf = new ExcelDataSetConfiguration
                    {
                        ConfigureDataTable = _ => new ExcelDataTableConfiguration
                        {
                            UseHeaderRow = true
                        }
                    };

                    var dataSet = reader.AsDataSet(conf);

                    // Now you can get data from each sheet by its index or its "name"
                    var dataTable = dataSet.Tables[0];

                    Console.WriteLine("Total no of rows  " + dataTable.Rows.Count);
                    Console.WriteLine("Total no of Columns  " + dataTable.Columns.Count);

                    return dataTable;

                }

        }
   
}

Specifying Font and Size in HTML table

This worked for me and also worked with bootstrap tables

<style>
    .table td, .table th {
        font-size: 10px;
    }
</style>

Uncompress tar.gz file

Use -C option of tar:

tar zxvf <yourfile>.tar.gz -C /usr/src/

and then, the content of the tar should be in:

/usr/src/<yourfile>

jQuery disable/enable submit button

We can simply have if & else .if suppose your input is empty we can have

if($(#name).val() != '') {
   $('input[type="submit"]').attr('disabled' , false);
}

else we can change false into true

Detect page change on DataTable

This working good

$('#id-of-table').on('draw.dt', function() {
    // do action here
});

How to import Google Web Font in CSS file?

Add the Below code in your CSS File to import Google Web Fonts.

@import url(https://fonts.googleapis.com/css?family=Open+Sans);

Replace the Open+Sans parameter value with your Font name.

Your CSS file should look like:

@import url(https://fonts.googleapis.com/css?family=Open+Sans);

body{
   font-family: 'Open Sans',serif;
}

Replace a string in shell script using a variable

To let your shell expand the variable, you need to use double-quotes like

sed -i "s#12345678#$replace#g" file.txt

This will break if $replace contain special sed characters (#, \). But you can preprocess $replace to quote them:

replace_quoted=$(printf '%s' "$replace" | sed 's/[#\]/\\\0/g')
sed -i "s#12345678#$replace_quoted#g" file.txt

Equivalent of varchar(max) in MySQL?

The max length of a varchar is subject to the max row size in MySQL, which is 64KB (not counting BLOBs):

VARCHAR(65535)

However, note that the limit is lower if you use a multi-byte character set:

VARCHAR(21844) CHARACTER SET utf8

Here are some examples:

The maximum row size is 65535, but a varchar also includes a byte or two to encode the length of a given string. So you actually can't declare a varchar of the maximum row size, even if it's the only column in the table.

mysql> CREATE TABLE foo ( v VARCHAR(65534) );
ERROR 1118 (42000): Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

But if we try decreasing lengths, we find the greatest length that works:

mysql> CREATE TABLE foo ( v VARCHAR(65532) );
Query OK, 0 rows affected (0.01 sec)

Now if we try to use a multibyte charset at the table level, we find that it counts each character as multiple bytes. UTF8 strings don't necessarily use multiple bytes per string, but MySQL can't assume you'll restrict all your future inserts to single-byte characters.

mysql> CREATE TABLE foo ( v VARCHAR(65532) ) CHARSET=utf8;
ERROR 1074 (42000): Column length too big for column 'v' (max = 21845); use BLOB or TEXT instead

In spite of what the last error told us, InnoDB still doesn't like a length of 21845.

mysql> CREATE TABLE foo ( v VARCHAR(21845) ) CHARSET=utf8;
ERROR 1118 (42000): Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

This makes perfect sense, if you calculate that 21845*3 = 65535, which wouldn't have worked anyway. Whereas 21844*3 = 65532, which does work.

mysql> CREATE TABLE foo ( v VARCHAR(21844) ) CHARSET=utf8;
Query OK, 0 rows affected (0.32 sec)

Send FormData with other field in AngularJS

Assume that we want to get a list of certain images from a PHP server using the POST method.

You have to provide two parameters in the form for the POST method. Here is how you are going to do.

app.controller('gallery-item', function ($scope, $http) {

    var url = 'service.php'; 

    var data = new FormData();

    data.append("function", 'getImageList');
    data.append('dir', 'all');

    $http.post(url, data, {
        transformRequest: angular.identity,
        headers: {'Content-Type': undefined}
      }).then(function (response) {

          // This function handles success
        console.log('angular:', response);

    }, function (response) {

        // this function handles error

    });
});

I have tested it on my system and it works.

Nodejs cannot find installed module on Windows

I ran into this issue on Windows 7, running

npm install -g gulp

as administrator while being logged on as a normal user.

Solution: When executing the same installation as normal user (not "run as admin" for cmd) all was fine. I guess it is related to the default install and search path.

Wildcards in jQuery selectors

for classes you can use:

div[class^="jander"]

C# Switch-case string starting with

Try this and tell my if it works hope it help you:

string value = Convert.ToString(Console.ReadLine());

Switch(value)
{
    Case "abc":

    break;

    default:

    break;
}

Django model "doesn't declare an explicit app_label"

I got this one when I used ./manage.py shell then I accidentally imported from the root project level directory

# don't do this
from project.someapp.someModule import something_using_a_model
# do this
from someapp.someModule import something_using_a_model

something_using_a_model()

remote: repository not found fatal: not found

Your username shouldn't be an email address, but your GitHub user account: pete.
And your password should be your GitHub account password.

You actually can set your username directly in the remote url, in order for Git to request only your password:

cd C:\Users\petey_000\rails_projects\first_app
git remote set-url origin https://[email protected]/pete/first_app

And you need to create the fist_app repo on GitHub first: make sure to create it completely empty, or, if you create it with an initial commit (including a README.md, a license file and a .gitignore file), then do a git pull first, before making your git push.

How to prevent user from typing in text field without disabling the field?

For a css-only solution, try setting pointer-events: none on the input.

How To Set A JS object property name from a variable

This is the way to dynamically set the value

var jsonVariable = {};
for (var i = 1; i < 3; i++) {
    var jsonKey = i + 'name';
    jsonVariable[jsonKey] = 'name' + i;
}

How do I tell if a regular file does not exist in Bash?

To test file existence, the parameter can be any one of the following:

-e: Returns true if file exists (regular file, directory, or symlink)
-f: Returns true if file exists and is a regular file
-d: Returns true if file exists and is a directory
-h: Returns true if file exists and is a symlink

All the tests below apply to regular files, directories, and symlinks:

-r: Returns true if file exists and is readable
-w: Returns true if file exists and is writable
-x: Returns true if file exists and is executable
-s: Returns true if file exists and has a size > 0

Example script:

#!/bin/bash
FILE=$1

if [ -f "$FILE" ]; then
   echo "File $FILE exists"
else
   echo "File $FILE does not exist"
fi

Adding Multiple Values in ArrayList at a single index

How about

First adding your desired result as arraylist and
and convert to double array as you want.

Try like this..

import java.util.ArrayList;
import java.util.List;

    public class ArrayTest {

        /**
         * @param args
         */
        public static void main(String[] args) {
            // TODO Auto-generated method stub

            // Your Prepared data. 
            List<double[]> values = new ArrayList<double[]>(2);

            double[] element1 = new double[] { 100, 100, 100, 100, 100 };
            double[] element2 = new double[] { 50, 35, 25, 45, 65 };

            values.add(element1);
            values.add(element2);

            // Add the result to arraylist.
            List<Double> temp = new ArrayList<Double>();
            for(int j=0;j<values.size(); j++) {
                for (int i = 0; i < values.get(0).length; i++) {
                    temp.add(values.get(0)[i]);
                    temp.add(values.get(1)[i]);
                }
            }

            // Convert arraylist to int[].
            Double[] result = temp.toArray(new Double[temp.size()]);
            double[] finalResult = new double[result.length]; // This hold final result.
            for (int i = 0; i < result.length; i++) {
                finalResult[i] = result[i].doubleValue();
            }

            for (int i = 0; i < finalResult.length; i++) {
                System.out.println(finalResult[i]);
            }
        }
    }

The Response content must be a string or object implementing __toString(), "boolean" given after move to psql

It is being pointed out not directly in the file which is caused the error. But it is actually triggered in a controller file. It happens when a return value from a method defined inside in a controller file is set on a boolean value. It must not be set on a boolean type but on the other hand, it must be set or given a value of a string type. It can be shown as follows :

public function saveFormSummary(Request $request) {
      ... 
      $status = true;
      return $status;
}

Given the return value of a boolean type above in a method, to be able to solve the problem to handle the error specified. Just change the type of the return value into a string type

as follows :

public function saveFormSummary(Request $request) {
      ... 
      $status = "true";
      return $status;
}

Side-by-side plots with ggplot2

Using the reshape package you can do something like this.

library(ggplot2)
wide <- data.frame(x = rnorm(100), eps = rnorm(100, 0, .2))
wide$first <- with(wide, 3 * x + eps)
wide$second <- with(wide, 2 * x + eps)
long <- melt(wide, id.vars = c("x", "eps"))
ggplot(long, aes(x = x, y = value)) + geom_smooth() + geom_point() + facet_grid(.~ variable)

Add common prefix to all cells in Excel

Option 1: select the cell(s), under formatting/number/custom formatting, type in

"BOB" General

now you have a prefix "BOB" next to numbers, dates, booleans, but not next to TEXTs

Option2: As before, but use the following format

_ "BOB" @_

now you have a prefix BOB, this works even if the cell contained text

Cheers, Sudhi

How to see the actual Oracle SQL statement that is being executed

Yep, that's definitely possible. The v$sql views contain that info. Something like this piece of code should point you in the right direction. I haven't tried that specific piece of code myself - nowhere near an Oracle DB right now.

[Edit] Damn two other answers already. Must type faster next time ;-)

Creating a very simple 1 username/password login in php

Here is a simple php script for login and a page that can only be accessed by logged in users.

login.php

<?php
    session_start();
    echo isset($_SESSION['login']);
    if(isset($_SESSION['login'])) {
      header('LOCATION:index.php'); die();
    }
?>
<!DOCTYPE html>
<html>
   <head>
     <meta http-equiv='content-type' content='text/html;charset=utf-8' />
     <title>Login</title>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
   </head>
<body>
  <div class="container">
    <h3 class="text-center">Login</h3>
    <?php
      if(isset($_POST['submit'])){
        $username = $_POST['username']; $password = $_POST['password'];
        if($username === 'admin' && $password === 'password'){
          $_SESSION['login'] = true; header('LOCATION:admin.php'); die();
        } {
          echo "<div class='alert alert-danger'>Username and Password do not match.</div>";
        }

      }
    ?>
    <form action="" method="post">
      <div class="form-group">
        <label for="username">Username:</label>
        <input type="text" class="form-control" id="username" name="username" required>
      </div>
      <div class="form-group">
        <label for="pwd">Password:</label>
        <input type="password" class="form-control" id="pwd" name="password" required>
      </div>
      <button type="submit" name="submit" class="btn btn-default">Login</button>
    </form>
  </div>
</body>
</html>

admin.php ( only logged in users can access it )

<?php
    session_start();
    if(!isset($_SESSION['login'])) {
        header('LOCATION:login.php'); die();
    }
?>
<html>
    <head>
        <title>Admin Page</title>
    </head>
    <body>
        This is admin page view able only by logged in users.
    </body> 
</html>

Node.js Port 3000 already in use but it actually isn't?

It's very simple. You can fix it in 2 easy steps.

Check your environment variables if there is a key/entry with name "PORT".
If found delete that entry or rename it to something else.

It turns out that some other program is using that variable. Usually when you start react-scripts it will look for an environment variable with that title PORT.

How to get JSON from webpage into Python script

you need import requests and use from json() method :

source = requests.get("url").json()
print(source)

Of course, this method also works:

import json,urllib.request
data = urllib.request.urlopen("url").read()
output = json.loads(data)
print (output)

json.loads will decode it into a Python object using this table, for example a JSON object will become a Python dict.

git push to specific branch

git push origin amd_qlp_tester will work for you. If you just type git push, then the remote of the current branch is the default value.

Syntax of push looks like this - git push <remote> <branch>. If you look at your remote in .git/config file, you will see an entry [remote "origin"] which specifies url of the repository. So, in the first part of command you will tell Git where to find repository for this project, and then you just specify a branch.

Transparent control over PictureBox

Setting user agent of a java URLConnection

Just for clarification: setRequestProperty("User-Agent", "Mozilla ...") now works just fine and doesn't append java/xx at the end! At least with Java 1.6.30 and newer.

I listened on my machine with netcat(a port listener):

$ nc -l -p 8080

It simply listens on the port, so you see anything which gets requested, like raw http-headers.

And got the following http-headers without setRequestProperty:

GET /foobar HTTP/1.1
User-Agent: Java/1.6.0_30
Host: localhost:8080
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive

And WITH setRequestProperty:

GET /foobar HTTP/1.1
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2
Host: localhost:8080
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive

As you can see the user agent was properly set.

Full example:

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;


public class TestUrlOpener {

    public static void main(String[] args) throws IOException {
        URL url = new URL("http://localhost:8080/foobar");
        URLConnection hc = url.openConnection();
        hc.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2");

        System.out.println(hc.getContentType());
    }

}

How can I get the day of a specific date with PHP

$date = strtotime('2016-2-3');
$date = date('l', $date);
var_dump($date)

(i added format 'l' so it will return full name of day)

Centering a background image, using CSS

Try

background-position: center center;

How to script FTP upload and download?

This script generates the command file then pipes the command file to the ftp program, creating a log along the way. Finally print the original bat file, the command files and the log of this session.

@echo on
@echo off > %0.ftp
::== GETmy!dir.bat
>> %0.ftp echo a00002t
>> %0.ftp echo iasdad$2
>> %0.ftp echo help
>> %0.ftp echo prompt
>> %0.ftp echo ascii
>> %0.ftp echo !dir REPORT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo get REPORT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo !dir REPORT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo *************************************************   
>> %0.ftp echo !dir CONTENT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo get CONTENT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo !dir CONTENT.CP1C.ROLLEDUP.TXT
>> %0.ftp echo *************************************************   
>> %0.ftp echo !dir WORKLOAD.CP1c.ROLLEDUP.TXT
>> %0.ftp echo get WORKLOAD.CP1C.ROLLEDUP.TXT
>> %0.ftp echo !dir WORKLOAD.CP1C.ROLLEDUP.TXT
>> %0.ftp echo *************************************************   
>> %0.ftp echo !dir REPORT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo get REPORT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo !dir REPORT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo *************************************************   
>> %0.ftp echo !dir CONTENT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo get CONTENT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo !dir CONTENT.TMMC.ROLLEDUP.TXT
>> %0.ftp echo **************************************************   
>> %0.ftp echo !dir WORKLOAD.TMMC.ROLLEDUP.TXT
>> %0.ftp echo get WORKLOAD.TMMC.ROLLEDUP.TXT
>> %0.ftp echo !dir WORKLOAD.TMMC.ROLLEDUP.TXT
>> %0.ftp echo quit
ftp -d -v -s:%0.ftp 150.45.12.18 > %0.log
type %0.bat 
type %0.ftp 
type %0.log

SQL Server Error : String or binary data would be truncated

You're trying to write more data than a specific column can store. Check the sizes of the data you're trying to insert against the sizes of each of the fields.

In this case transaction_status is a varchar(10) and you're trying to store 19 characters to it.

C# DataTable.Select() - How do I format the filter criteria to include null?

The way to check for null is to check for it:

DataRow[] myResultSet = myDataTable.Select("[COLUMN NAME] is null");

You can use and and or in the Select statement.

HTML anchor link - href and onclick both?

Just return true instead?

The return value from the onClick code is what determines whether the link's inherent clicked action is processed or not - returning false means that it isn't processed, but if you return true then the browser will proceed to process it after your function returns and go to the proper anchor.

A potentially dangerous Request.Path value was detected from the client (*)

Try to set web project's server propery as Local IIS if it is IIS Express. Be sure if project url is right and create virual directory.

How to select top 10 in Access query?

Get IFrame's document, from JavaScript in main document

In case you get a cross-domain error:

If you have control over the content of the iframe - that is, if it is merely loaded in a cross-origin setup such as on Amazon Mechanical Turk - you can circumvent this problem with the <body onload='my_func(my_arg)'> attribute for the inner html.

For example, for the inner html, use the this html parameter (yes - this is defined and it refers to the parent window of the inner body element):

<body onload='changeForm(this)'>

In the inner html :

    function changeForm(window) {
        console.log('inner window loaded: do whatever you want with the inner html');
        window.document.getElementById('mturk_form').style.display = 'none';
    </script>

Representing Directory & File Structure in Markdown Syntax

There is an NPM module for this:

npm dree

It allows you to have a representation of a directory tree as a string or an object. Using it with the command line will allow you to save the representation in a txt file.

Example:

$ npm dree parse myDirectory --dest ./generated --name tree

Static link of shared library function in gcc

In gcc, this isn't supported. In fact, this isn't supported in any existing compiler/linker i'm aware of.

How to update values in a specific row in a Python Pandas DataFrame?

In SQL, I would have do it in one shot as

update table1 set col1 = new_value where col1 = old_value

but in Python Pandas, we could just do this:

data = [['ram', 10], ['sam', 15], ['tam', 15]] 
kids = pd.DataFrame(data, columns = ['Name', 'Age']) 
kids

which will generate the following output :

    Name    Age
0   ram     10
1   sam     15
2   tam     15

now we can run:

kids.loc[kids.Age == 15,'Age'] = 17
kids

which will show the following output

Name    Age
0   ram     10
1   sam     17
2   tam     17

which should be equivalent to the following SQL

update kids set age = 17 where age = 15

How to set cookie value with AJAX request?

Basically, ajax request as well as synchronous request sends your document cookies automatically. So, you need to set your cookie to document, not to request. However, your request is cross-domain, and things became more complicated. Basing on this answer, additionally to set document cookie, you should allow its sending to cross-domain environment:

type: "GET",    
url: "http://example.com",
cache: false,
// NO setCookies option available, set cookie to document
//setCookies: "lkfh89asdhjahska7al446dfg5kgfbfgdhfdbfgcvbcbc dfskljvdfhpl",
crossDomain: true,
dataType: 'json',
xhrFields: {
    withCredentials: true
},
success: function (data) {
    alert(data);
});

CreateProcess error=2, The system cannot find the file specified

My recomendation is to keep the getRuntime().exec because exec uses the ProcessBuilder.

Try

 p=r.exec(new String[] {"winrar", "x", "h:\\myjar.jar", "*.*", "h:\\new"}, null, dir);

How can I use xargs to copy files that have spaces and quotes in their names?

This method works on Mac OS X v10.7.5 (Lion):

find . | grep FooBar | xargs -I{} cp {} ~/foo/bar

I also tested the exact syntax you posted. That also worked fine on 10.7.5.

Is there a "theirs" version of "git merge -s ours"?

I used the answer from Paul Pladijs since now. I found out, you can do a "normal" merge, conflicts occur, so you do

git checkout --theirs <file>

to resolve the conflict by using the revision from the other branch. If you do this for each file, you have the same behaviour as you would expect from

git merge <branch> -s theirs

Anyway, the effort is more than it would be with the merge-strategy! (This was tested with git version 1.8.0)

One-line list comprehension: if-else variants

[x if x % 2 else x * 100 for x in range(1, 10) ]

Update all objects in a collection using LINQ

No, LINQ doesn't support a manner of mass updating. The only shorter way would be to use a ForEach extension method - Why there is no ForEach extension method on IEnumerable?

ASP.NET Forms Authentication failed for the request. Reason: The ticket supplied has expired

Here is a good article from Microsoft http://www.iis.net/learn/troubleshoot/security-issues/troubleshooting-forms-authentication that covers various cases and scenarios.

How do I clear only a few specific objects from the workspace?

To clear all data:

click on Misc>Remove all objects.

Your good to go.

To clear the console:

click on edit>Clear console.

No need for any code.

How to get the PYTHONPATH in shell?

Python, at startup, loads a bunch of values into sys.path (which is "implemented" via a list of strings), including:

various hardcoded places
the value of $PYTHONPATH
probably some stuff from startup files (I'm not sure if Python has rcfiles)

$PYTHONPATH is only one part of the eventual value of sys.path.

If you're after the value of sys.path, the best way would be to ask Python (thanks @Codemonkey):

python -c "import sys; print sys.path"

How do I use the ternary operator ( ? : ) in PHP as a shorthand for "if / else"?

If first variable($a) is null, then assign value of second variable($b) to first variable($a)

 $a = 5;
 $b = 10;   

 $a != ''?$a: $a = $b;

 echo $a;

Automatically set appsettings.json for dev and release environments in asp.net core?

This is version that works for me when using a console app without a web page:

var builder = new ConfigurationBuilder()
             .SetBasePath(Directory.GetCurrentDirectory())
             .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
             .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json", optional: true);

            IConfigurationRoot configuration = builder.Build();
            AppSettings appSettings = new AppSettings();
            configuration.GetSection("AppSettings").Bind(appSettings);

How to get client IP address using jQuery

jQuery can handle JSONP, just pass an url formatted with the callback=? parameter to the $.getJSON method, for example:

_x000D_

$.getJSON("https://api.ipify.org/?format=json", function(e) {_x000D_
    console.log(e.ip);_x000D_
});

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

_x000D_

This example is of a really simple JSONP service implemented on with api.ipify.org.

If you aren't looking for a cross-domain solution the script can be simplified even more, since you don't need the callback parameter, and you return pure JSON.

how do you increase the height of an html textbox

Increasing the font size on a text box will usually expand its size automatically.

<input type="text" style="font-size:16pt;">

If you want to set a height that is not proportional to the font size, I would recommend using something like the following. This prevents browsers like IE from rendering the text inside at the top rather than vertically centered.

.form-text{
    padding:15px 0;
}

C# version of java's synchronized keyword?

Take note, with full paths the line: [MethodImpl(MethodImplOptions.Synchronized)] should look like

[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.Synchronized)]

Rmi connection refused with localhost

One difference we can note in Windows is:

If you use Runtime.getRuntime().exec("rmiregistry 1024");

you can see rmiregistry.exe process will run in your Task Manager

whereas if you use Registry registry = LocateRegistry.createRegistry(1024);

you can not see the process running in Task Manager,

I think Java handles it in a different way.

and this is my server.policy file

Before running the the application, make sure that you killed all your existing javaw.exe and rmiregistry.exe corresponds to your rmi programs which are already running.

The following code works for me by using Registry.LocateRegistry() or

Runtime.getRuntime.exec("");


// Standard extensions get all permissions by default

grant {
    permission java.security.AllPermission;
};

VM argument

-Djava.rmi.server.codebase=file:\C:\Users\Durai\workspace\RMI2\src\

Code:

package server;    

import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.rmi.Remote;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class HelloServer 
{
  public static void main (String[] argv) 
  {
    try {

        if(System.getSecurityManager()==null){
            System.setProperty("java.security.policy","C:\\Users\\Durai\\workspace\\RMI\\src\\server\\server.policy");
            System.setSecurityManager(new RMISecurityManager());
        }

 Runtime.getRuntime().exec("rmiregistry 1024");

 //     Registry registry = LocateRegistry.createRegistry(1024);
   //   registry.rebind ("Hello", new Hello ("Hello,From Roseindia.net pvt ltd!"));
   //Process process = Runtime.getRuntime().exec("C:\\Users\\Durai\\workspace\\RMI\\src\\server\\rmi_registry_start.bat");

        Naming.rebind ("//localhost:1024/Hello",new Hello ("Hello,From Roseindia.net pvt ltd!")); 
      System.out.println ("Server is connected and ready for operation.");
    } 
    catch (Exception e) {
      System.out.println ("Server not connected: " + e);
      e.printStackTrace();
    }
  }
}

Overflow Scroll css is not working in the div

If you set a static height for your header, you can use that in a calculation for the size of your wrapper.

http://jsfiddle.net/ske5Lqyv/5/

Using your example code, you can add this CSS:

html, body {
  margin: 0px;
  padding: 0px;
  height: 100%;
}

#container {
  height: 100%;
}

.header {
  height: 64px;
  background-color: lightblue;
}

.wrapper {
  height: calc(100% - 64px);
  overflow-y: auto;
}

Or, you can use flexbox for a more dynamic approach http://jsfiddle.net/19zbs7je/3/

<div id="container">
  <div class="section">
    <div class="header">Heading</div>
    <div class="wrapper">
      <p>Large Text</p>
    </div>
  </div>
</div>

html, body {
  margin: 0px;
  padding: 0px;
  height: 100%;
}

#container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.section {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.header {
  height: 64px;
  background-color: lightblue;
  flex-shrink: 0;
}

.wrapper {
  flex-grow: 1;
  overflow: auto;
  min-height: 100%; 
}

And if you'd like to get even fancier, take a look at my response to this question https://stackoverflow.com/a/52416148/1513083

Call to undefined method mysqli_stmt::get_result

Please read the user notes for this method:

http://php.net/manual/en/mysqli-stmt.get-result.php

It requires the mysqlnd driver... if it isn't installed on your webspace you will have to work with BIND_RESULT & FETCH!

https://secure.php.net/manual/en/mysqli-stmt.bind-result.php

https://secure.php.net/manual/en/mysqli-stmt.fetch.php

date() method, "A non well formed numeric value encountered" does not want to format a date passed in $_POST

From the documentation for strtotime():

Dates in the m/d/y or d-m-y formats are disambiguated by looking at the separator between the various components: if the separator is a slash (/), then the American m/d/y is assumed; whereas if the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed.

In your date string, you have 12-16-2013. 16 isn't a valid month, and hence strtotime() returns false.

Since you can't use DateTime class, you could manually replace the - with / using str_replace() to convert the date string into a format that strtotime() understands:

$date = '2-16-2013';
echo date('Y-m-d', strtotime(str_replace('-','/', $date))); // => 2013-02-16

import an array in python

Another option is numpy.genfromtxt, e.g:

import numpy as np
data = np.genfromtxt("myfile.dat",delimiter=",")

This will make data a numpy array with as many rows and columns as are in your file

CSS transition effect makes image blurry / moves image 1px, in Chrome?

I recommended an experimental new attribute CSS I tested on latest browser and it's good:

image-rendering: optimizeSpeed;             /*                     */
image-rendering: -moz-crisp-edges;          /* Firefox             */
image-rendering: -o-crisp-edges;            /* Opera               */
image-rendering: -webkit-optimize-contrast; /* Chrome (and Safari) */
image-rendering: optimize-contrast;         /* CSS3 Proposed       */
-ms-interpolation-mode: nearest-neighbor;   /* IE8+                */

With this the browser will know the algorithm for rendering

How to create Select List for Country and States/province in MVC

I too liked Jordan's answer and implemented it myself. I only needed to abbreviations so in case someone else needs the same:

    public static IEnumerable<SelectListItem> GetStatesList()
    {
        IList<SelectListItem> states = new List<SelectListItem>
        {
            new SelectListItem() {Text="AL", Value="AL"},
            new SelectListItem() { Text="AK", Value="AK"},
            new SelectListItem() { Text="AZ", Value="AZ"},
            new SelectListItem() { Text="AR", Value="AR"},
            new SelectListItem() { Text="CA", Value="CA"},
            new SelectListItem() { Text="CO", Value="CO"},
            new SelectListItem() { Text="CT", Value="CT"},
            new SelectListItem() { Text="DC", Value="DC"},
            new SelectListItem() { Text="DE", Value="DE"},
            new SelectListItem() { Text="FL", Value="FL"},
            new SelectListItem() { Text="GA", Value="GA"},
            new SelectListItem() { Text="HI", Value="HI"},
            new SelectListItem() { Text="ID", Value="ID"},
            new SelectListItem() { Text="IL", Value="IL"},
            new SelectListItem() { Text="IN", Value="IN"},
            new SelectListItem() { Text="IA", Value="IA"},
            new SelectListItem() { Text="KS", Value="KS"},
            new SelectListItem() { Text="KY", Value="KY"},
            new SelectListItem() { Text="LA", Value="LA"},
            new SelectListItem() { Text="ME", Value="ME"},
            new SelectListItem() { Text="MD", Value="MD"},
            new SelectListItem() { Text="MA", Value="MA"},
            new SelectListItem() { Text="MI", Value="MI"},
            new SelectListItem() { Text="MN", Value="MN"},
            new SelectListItem() { Text="MS", Value="MS"},
            new SelectListItem() { Text="MO", Value="MO"},
            new SelectListItem() { Text="MT", Value="MT"},
            new SelectListItem() { Text="NE", Value="NE"},
            new SelectListItem() { Text="NV", Value="NV"},
            new SelectListItem() { Text="NH", Value="NH"},
            new SelectListItem() { Text="NJ", Value="NJ"},
            new SelectListItem() { Text="NM", Value="NM"},
            new SelectListItem() { Text="NY", Value="NY"},
            new SelectListItem() { Text="NC", Value="NC"},
            new SelectListItem() { Text="ND", Value="ND"},
            new SelectListItem() { Text="OH", Value="OH"},
            new SelectListItem() { Text="OK", Value="OK"},
            new SelectListItem() { Text="OR", Value="OR"},
            new SelectListItem() { Text="PA", Value="PA"},
            new SelectListItem() { Text="PR", Value="PR"},
            new SelectListItem() { Text="RI", Value="RI"},
            new SelectListItem() { Text="SC", Value="SC"},
            new SelectListItem() { Text="SD", Value="SD"},
            new SelectListItem() { Text="TN", Value="TN"},
            new SelectListItem() { Text="TX", Value="TX"},
            new SelectListItem() { Text="UT", Value="UT"},
            new SelectListItem() { Text="VT", Value="VT"},
            new SelectListItem() { Text="VA", Value="VA"},
            new SelectListItem() { Text="WA", Value="WA"},
            new SelectListItem() { Text="WV", Value="WV"},
            new SelectListItem() { Text="WI", Value="WI"},
            new SelectListItem() { Text="WY", Value="WY"}
        };
        return states;
    }

What is the difference between char array and char pointer in C?

For cases like this, the effect is the same: You end up passing the address of the first character in a string of characters.

The declarations are obviously not the same though.

The following sets aside memory for a string and also a character pointer, and then initializes the pointer to point to the first character in the string.

char *p = "hello";

While the following sets aside memory just for the string. So it can actually use less memory.

char p[10] = "hello";

How to run a script file remotely using SSH

Make the script executable by the user "Kev" and then remove the try it running through the command sh kev@server1 /test/foo.sh

How can I update window.location.hash without jumping the document?

I used a combination of Attila Fulop (Lea Verou) solution for modern browsers and Gavin Brock solution for old browsers as follows:

if (history.pushState) {
    // IE10, Firefox, Chrome, etc.
    window.history.pushState(null, null, '#' + id);
} else {
    // IE9, IE8, etc
    window.location.hash = '#!' + id;
}

As observed by Gavin Brock, to capture the id back you will have to treat the string (which in this case can have or not the "!") as follows:

id = window.location.hash.replace(/^#!?/, '');

Before that, I tried a solution similar to the one proposed by user706270, but it did not work well with Internet Explorer: as its Javascript engine is not very fast, you can notice the scroll increase and decrease, which produces a nasty visual effect.

How can I lock the first row and first column of a table when scrolling, possibly using JavaScript and CSS?

You need two tables, where the first one is an exact overlay over the second one. The second one contains all the data, where the first one just contains the first column. You have to synchronize it's width and depending on the content also the height of it's rows.

Additional to this two tables, you need a third one. That's the first row, which lays exactly between the other two and has to be synchronized in the same way.

You will need absolute positioning here. Next, you would synchronize the scrolling of the data table with the scrolling positions of the head row and first column table.

That works very well in all major browsers, except for one issue: The synchronized scrolling will flutter. To fix that, you need two outher div containers that hold a clone of the content of the header row and the first column. When scrolling vertically, you display the header row clone to prevent fluttering, while you reposition the original in the background. When scrolling horizontally, you would show the first row clone. Same thing here.

How to create web service (server & Client) in Visual Studio 2012?

When creating a New Project, under the language of your choice, select Web and then change to .NET Framework 3.5 and you will get the option of creating an ASP.NET WEB Service Application.

enter image description here

Tri-state Check box in HTML?

I think that the most semantic way is using readonly attribute that checkbox inputs can have. No css, no images, etc; a built-in HTML property!

See Fiddle:
http://jsfiddle.net/chriscoyier/mGg85/2/

As described here in last trick: http://css-tricks.com/indeterminate-checkboxes/

Stop form refreshing page on submit

If you want to use Pure Javascript then the following snippet will be better than anything else.

Suppose:

HTML:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Form Without Submiting With Pure JS</title>
        <script type="text/javascript">
            window.onload = function(){
                /**
                 * Just Make sure to return false so that your request will not go the server script
                 */
                document.getElementById('simple_form').onsubmit = function(){
                    // After doing your logic that you want to do 

                    return false 
                }
            }
        </script>
    </head>
    <body>

    </body>
</html>
<form id="simple_form" method="post">
    <!-- Your Inputs will go here  -->
    <input type="submit" value="Submit Me!!" />
</form>

Hope so it works for You!!

How to convert an iterator to a stream?

Another way to do this on Java 9+ using Stream::iterate(T, Predicate, UnaryOperator):

Stream.iterate(iterator, Iterator::hasNext, UnaryOperator.identity())
        .map(Iterator::next)
        .forEach(System.out::println);

How to perform an SQLite query within an Android application?

I came here for a reminder of how to set up the query but the existing examples were hard to follow. Here is an example with more explanation.

SQLiteDatabase db = helper.getReadableDatabase();

String table = "table2";
String[] columns = {"column1", "column3"};
String selection = "column3 =?";
String[] selectionArgs = {"apple"};
String groupBy = null;
String having = null;
String orderBy = "column3 DESC";
String limit = "10";

Cursor cursor = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy, limit);

Parameters

table: the name of the table you want to query
columns: the column names that you want returned. Don't return data that you don't need.
selection: the row data that you want returned from the columns (This is the WHERE clause.)
selectionArgs: This is substituted for the ? in the selection String above.
groupBy and having: This groups duplicate data in a column with data having certain conditions. Any unneeded parameters can be set to null.
orderBy: sort the data
limit: limit the number of results to return

referenced before assignment error in python

I found this post through the fact that I had this error myself in my own code and I know that it has been a while since this was posted and you already got some answers and fixed issue for that situation but just wanted to explain how I fixed it just in case it could help someone else!! Basically what I thought at first was that the code editor as was using REPL.it as was making something for a friend and knew that she wouldn't want to have to download like a code editor anyways the point is I thought that it couldn't handle the code because the complexity was at 139 at that point got even higher afterwards, but then I began experimenting and realized that within my set of functions just outside of a true loop within my a_loop function for that letter to register it needed to define it! So basically I wasn't defining the Value in this case a counting feature actually within the code! I would share my code here but it's kind of personal as in the print statements and also it's 2349 lines long and yeah anyway hope this helps! Also recommend using if you can in my case for some of the code I could, putting it into way more scripts if you can to make it easier on your brain! Once again hope this helps, if you have any questions, please feel free to ask and I will answer to the best of my ability! I hope this helps!!!

-Sam

How to put a symbol above another in LaTeX?

Use \overset{above}{main} in math mode. In your case, \overset{a}{\#}.

No 'Access-Control-Allow-Origin' header is present on the requested resource- AngularJS

On the client side you can enable cors requests in AngularJS via

app.config(['$httpProvider', function($httpProvider) {
        $httpProvider.defaults.useXDomain = true;
        delete $httpProvider.defaults.headers.common['X-Requested-With'];
    }
]);

However if this still returns an error, this would imply that the server that you are making the request has to allow CORS request and has to be configured for that.

Module AppRegistry is not registered callable module (calling runApplication)

1.Close Emülator

2.npm start -- --reset-cache

3.XCode -> Product -> Clean Build Folder

4.npx react-native run-ios

How to add a custom CA Root certificate to the CA Store used by pip in Windows?

Not best answer but you can reuse an already created ca bundle using --cert option of pip, for instance:

pip install SQLAlchemy==1.1.15 --cert="C:\Users\myUser\certificates\my_ca-bundle.crt"

serialize/deserialize java 8 java.time with Jackson JSON mapper

For those who use Spring Boot 2.x

There is no need to do any of the above - Java 8 LocalDateTime is serialised/de-serialised out of the box. I had to do all of the above in 1.x, but with Boot 2.x, it works seamlessly.

See this reference too JSON Java 8 LocalDateTime format in Spring Boot

How do I select an entire row which has the largest ID in the table?

You could use a subselect:

SELECT row 
FROM table 
WHERE id=(
    SELECT max(id) FROM table
    )

Note that if the value of max(id) is not unique, multiple rows are returned.

If you only want one such row, use @MichaelMior's answer,

SELECT row from table ORDER BY id DESC LIMIT 1

Can linux cat command be used for writing text to file?

simply pipeline echo with cat

For example

echo write something to file.txt | cat > file.txt

Document Root PHP

Just / refers to the root of your website from the public html folder. DOCUMENT_ROOT refers to the local path to the folder on the server that contains your website.

For example, I have EasyPHP setup on a machine...

$_SERVER["DOCUMENT_ROOT"] gives me file:///C:/Program%20Files%20(x86)/EasyPHP-5.3.9/www but any file I link to with just / will be relative to my www folder.

If you want to give the absolute path to a file on your server (from the server's root) you can use DOCUMENT_ROOT. if you want to give the absolute path to a file from your website's root, use just /.

Export to CSV using jQuery and html

I am not sure if the above CSV generation code is so great as it appears to skip th cells and also did not appear to allow for commas in the value. So here is my CSV generation code that might be useful.

It does assume you have the $table variable which is a jQuery object (eg. var $table = $('#yourtable');)

$rows = $table.find('tr');

var csvData = "";

for(var i=0;i<$rows.length;i++){
                var $cells = $($rows[i]).children('th,td'); //header or content cells

                for(var y=0;y<$cells.length;y++){
                    if(y>0){
                      csvData += ",";
                    }
                    var txt = ($($cells[y]).text()).toString().trim();
                    if(txt.indexOf(',')>=0 || txt.indexOf('\"')>=0 || txt.indexOf('\n')>=0){
                        txt = "\"" + txt.replace(/\"/g, "\"\"") + "\"";
                    }
                    csvData += txt;
                }
                csvData += '\n';
 }

What is the simplest way to SSH using Python?

I have written Python bindings for libssh2. Libssh2 is a client-side library implementing the SSH2 protocol.

import socket
import libssh2

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(('exmaple.com', 22))

session = libssh2.Session()
session.startup(sock)
session.userauth_password('john', '******')

channel = session.channel()
channel.execute('ls -l')

print channel.read(1024)

jquery get all input from specific form

To iterate through all the inputs in a form you can do this:

$("form#formID :input").each(function(){
 var input = $(this); // This is the jquery object of the input, do what you will
});

This uses the jquery :input selector to get ALL types of inputs, if you just want text you can do :

$("form#formID input[type=text]")//...

etc.

How to sort a dataframe by multiple column(s)

or you can use package doBy

library(doBy)
dd <- orderBy(~-z+b, data=dd)

Chrome says "Resource interpreted as script but transferred with MIME type text/plain.", what gives?

For Java Application servers such as Weblogic

1) Make sure your weblogic.xml file is free of errors

like this one:

    <?xml version = '1.0' encoding = 'windows-1252'?>
<weblogic-web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation="http://www.bea.com/ns/weblogic/weblogic-web-app http://www.bea.com/ns/weblogic/weblogic-web-app/1.0/weblogic-web-app.xsd"
                  xmlns="http://www.bea.com/ns/weblogic/weblogic-web-app">
    <container-descriptor>
        <prefer-web-inf-classes>true</prefer-web-inf-classes>
    </container-descriptor>
    <context-root>MyWebApp</context-root>
</weblogic-web-app>

2) Add a mime type for javascript to your web.xml file:

    ...
        </servlet-mapping>

        <mime-mapping>    
            <extension>js</extension>        
            <mime-type>application/javascript</mime-type>        
        </mime-mapping>

        <welcome-file-list>
    ...

This will also work for other Java containers - Tomcat etc. application/javascript is currently the only valid mime-type; others like text/javascript have been deprecated.

3) You may need to clear up your browser cache or hit CTRL-F5

How to implode array with key and value without foreach in PHP

For create mysql where conditions from array

$sWheres = array('item1'  => 'object1',
                 'item2'  => 'object2',
                 'item3'  => 1,
                 'item4'  => array(4,5),
                 'item5'  => array('object3','object4'));
$sWhere = '';
if(!empty($sWheres)){
    $sWhereConditions = array();
    foreach ($sWheres as $key => $value){
        if(!empty($value)){
            if(is_array($value)){
                $value = array_filter($value); // For remove blank values from array
                if(!empty($value)){
                    array_walk($value, function(&$item){ $item = sprintf("'%s'", $item); }); // For make value string type 'string'
                    $sWhereConditions[] = sprintf("%s in (%s)", $key, implode(', ', $value));
                }
            }else{
                $sWhereConditions[] = sprintf("%s='%s'", $key, $value);
            }
        }
    }
    if(!empty($sWhereConditions)){
        $sWhere .= "(".implode(' AND ', $sWhereConditions).")";
    }
}
echo $sWhere;  // (item1='object1' AND item2='object2' AND item3='1' AND item4 in ('4', '5') AND item5 in ('object3', 'object4'))

How can I add items to an empty set in python

>>> d = {}
>>> D = set()
>>> type(d)
<type 'dict'>
>>> type(D)
<type 'set'>

What you've made is a dictionary and not a Set.

The update method in dictionary is used to update the new dictionary from a previous one, like so,

>>> abc = {1: 2}
>>> d.update(abc)
>>> d
{1: 2}

Whereas in sets, it is used to add elements to the set.

>>> D.update([1, 2])
>>> D
set([1, 2])

Set size of HTML page and browser window

This should work.

<!DOCTYPE html>
<html>
    <head>
        <title>Hello World</title>
        <style>
            html, body {
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
                background-color: green;
            }
            #container {
                width: inherit;
                height: inherit;
                margin: 0;
                padding: 0;
                background-color: pink;
            }
            h1 {
                margin: 0;
                padding: 0;
            }
        </style>
    </head>
    <body>
        <div id="container">
            <h1>Hello World</h1>
        </div>
    </body>
</html>

The background colors are there so you can see how this works. Copy this code to a file and open it in your browser. Try playing around with the CSS a bit and see what happens.

The width: inherit; height: inherit; pulls the width and height from the parent element. This should be the default and is not truly necessary.

Try removing the h1 { ... } CSS block and see what happens. You might notice the layout reacts in an odd way. This is because the h1 element is influencing the layout of its container. You could prevent this by declaring overflow: hidden; on the container or the body.

I'd also suggest you do some reading on the CSS Box Model.

How do you move a file?

May also be called, "rename" by tortoise, but svn move, is the command in the barebones svn client.

How to view DLL functions?

You may try the Object Browser in Visual Studio.

Select Edit Custom Component Set. From there, you can choose from a variety of .NET, COM or project libraries or just import external dlls via Browse.

stringstream, string, and char* conversion confusion

The ss.str() temporary is destroyed after initialization of cstr2 is complete. So when you print it with cout, the c-string that was associated with that std::string temporary has long been destoryed, and thus you will be lucky if it crashes and asserts, and not lucky if it prints garbage or does appear to work.

const char* cstr2 = ss.str().c_str();

The C-string where cstr1 points to, however, is associated with a string that still exists at the time you do the cout - so it correctly prints the result.

In the following code, the first cstr is correct (i assume it is cstr1 in the real code?). The second prints the c-string associated with the temporary string object ss.str(). The object is destroyed at the end of evaluating the full-expression in which it appears. The full-expression is the entire cout << ... expression - so while the c-string is output, the associated string object still exists. For cstr2 - it is pure badness that it succeeds. It most possibly internally chooses the same storage location for the new temporary which it already chose for the temporary used to initialize cstr2. It could aswell crash.

cout << cstr            // Prints correctly
    << ss.str().c_str() // Prints correctly
    << cstr2;           // Prints correctly (???)

The return of c_str() will usually just point to the internal string buffer - but that's not a requirement. The string could make up a buffer if its internal implementation is not contiguous for example (that's well possible - but in the next C++ Standard, strings need to be contiguously stored).

In GCC, strings use reference counting and copy-on-write. Thus, you will find that the following holds true (it does, at least on my GCC version)

string a = "hello";
string b(a);
assert(a.c_str() == b.c_str());

The two strings share the same buffer here. At the time you change one of them, the buffer will be copied and each will hold its separate copy. Other string implementations do things different, though.

Declaring multiple variables in JavaScript

Use the ES6 destructuring assignment: It will unpack values from arrays, or properties from objects, into distinct variables.

_x000D_

let [variable1 , variable2, variable3] =
["Hello, World!", "Testing...", 42];

console.log(variable1); // Hello, World!
console.log(variable2); // Testing...
console.log(variable3); // 42

_x000D_

How to export a MySQL database to JSON?

as described in the link, it only returns (as I mentioned) 15 results. (fwiw, I checked these results against the 4000 I'm supposed to get, and these 15 are the same as the first 15 of the 4000)

That's because mysql restricts the length of the data returned by group concat to the value set in @@group_concat_max_len as soon as it gets to the that amount it truncates and returns what it's gotten so far.

You can set @@group_concat_max_len in a few different ways. reference The mysql documentation...

Best way to remove from NSMutableArray while iterating?

This is a very simple problem. You just iterate backwards:

for (NSInteger i = array.count - 1; i >= 0; i--) {
   ElementType* element = array[i];
   if ([element shouldBeRemoved]) {
       [array removeObjectAtIndex:i];
   }
}

This is a very common pattern.

How to do a "Save As" in vba code, saving my current Excel workbook with datestamp?

I know this is an old post but I was looking up something similar... I think your issue was that when you use Now(), the output will be "6/20/2014"... This an issue for a file name as it has "/" in it. As you may know, you cannot use certain symbols in a file name.

Cheers

How can I send cookies using PHP curl in addition to CURLOPT_COOKIEFILE?

I think the only cookie you need is JSESSIONID=xxx..

Also NEVER share your cookies, becasuse someone may access your personal data that way. Specially when the cookies are session. These cookies will stop working once you logout the site.

How to reference Microsoft.Office.Interop.Excel dll?

Use NuGet (VS 2013+):

The easiest way in any recent version of Visual Studio is to just use the NuGet package manager. (Even VS2013, with the NuGet Package Manager for Visual Studio 2013 extension.)

Right-click on "References" and choose "Manage NuGet Packages...", then just search for Excel.

VS 2012:

Older versions of VS didn't have access to NuGet.

Right-click on "References" and select "Add Reference".
Select "Extensions" on the left.
Look for Microsoft.Office.Interop.Excel.
(Note that you can just type "excel" into the search box in the upper-right corner.)

VS2012/2013 References

VS 2008 / 2010:

Right-click on "References" and select "Add Reference".
Select the ".NET" tab.
Look for Microsoft.Office.Interop.Excel.

VS 2010 References

How do I write a bash script to restart a process if it dies?

The easiest way to do it is using flock on file. In Python script you'd do

lf = open('/tmp/script.lock','w')
if(fcntl.flock(lf, fcntl.LOCK_EX|fcntl.LOCK_NB) != 0): 
   sys.exit('other instance already running')
lf.write('%d\n'%os.getpid())
lf.flush()

In shell you can actually test if it's running:

if [ `flock -xn /tmp/script.lock -c 'echo 1'` ]; then 
   echo 'it's not running'
   restart.
else
   echo -n 'it's already running with PID '
   cat /tmp/script.lock
fi

But of course you don't have to test, because if it's already running and you restart it, it'll exit with 'other instance already running'

When process dies, all it's file descriptors are closed and all locks are automatically removed.

mysqli_real_connect(): (HY000/2002): No such file or directory

change localhost to 127.0.0.1 in /etc/phpmyadmin/config.inc.php

$cfg['Servers'][$i]['host'] = '127.0.0.1';

The reason for this is that pma tries to connect to the mysql.socket if you use localhost. If you use 127.0.0.1 PMA makes a TCP connection which should work.

Set Label Text with JQuery

I would just query for the for attribute instead of repetitively recursing the DOM tree.

$("input:checkbox").on("change", function() {
    $("label[for='"+this.id+"']").text("TESTTTT");
});

Saving image from PHP URL

$img_file='http://www.somedomain.com/someimage.jpg'

$img_file=file_get_contents($img_file);

$file_loc=$_SERVER['DOCUMENT_ROOT'].'/some_dir/test.jpg';

$file_handler=fopen($file_loc,'w');

if(fwrite($file_handler,$img_file)==false){
    echo 'error';
}

fclose($file_handler);

How do I customize Facebook's sharer.php

Sharer.php no longer allows you to customize. The page you share will be scraped for OG Tags and that data will be shared.

To properly customize, use FB.UI which comes with the JS-SDK.

numpy get index where value is true

You can use nonzero function. it returns the nonzero indices of the given input.

Easy Way

>>> (e > 15).nonzero()

(array([1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]), array([6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))

to see the indices more cleaner, use transpose method:

>>> numpy.transpose((e>15).nonzero())

[[1 6]
 [1 7]
 [1 8]
 [1 9]
 [2 0]
 ...

Not Bad Way

>>> numpy.nonzero(e > 15)

(array([1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]), array([6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))

or the clean way:

>>> numpy.transpose(numpy.nonzero(e > 15))

[[1 6]
 [1 7]
 [1 8]
 [1 9]
 [2 0]
 ...

How to solve npm install throwing fsevents warning on non-MAC OS?

package.json counts with a optionalDependencies key. NPM on Optional Dependencies.

You can add fsevents to this object and if you find yourself installing packages in a different platform than MacOS, fsevents will be skipped by either yarn or npm.

"optionalDependencies": {
  "fsevents": "2.1.2"
},

You will find a message like the following in the installation log:

info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.

Hope it helps!

No 'Access-Control-Allow-Origin' - Node / Apache Port Issue

Accepted answer is fine, in case you prefer something shorter, you may use a plugin called cors available for Express.js

It's simple to use, for this particular case:

var cors = require('cors');

// use it before all route definitions
app.use(cors({origin: 'http://localhost:8888'}));

rails simple_form - hidden field - create?

Correct way (if you are not trying to reset the value of the hidden_field input) is:

f.hidden_field :method, :value => value_of_the_hidden_field_as_it_comes_through_in_your_form

Where :method is the method that when called on the object results in the value you want

So following the example above:

= simple_form_for @movie do |f|
  = f.hidden :title, "some value"
  = f.button :submit

The code used in the example will reset the value (:title) of @movie being passed by the form. If you need to access the value (:title) of a movie, instead of resetting it, do this:

= simple_form_for @movie do |f|
  = f.hidden :title, :value => params[:movie][:title]
  = f.button :submit

Again only use my answer is you do not want to reset the value submitted by the user.

I hope this makes sense.

Fastest way to convert Image to Byte array

I'm not sure if you're going to get any huge gains for reasons Jon Skeet pointed out. However, you could try and benchmark the TypeConvert.ConvertTo method and see how it compares to using your current method.

ImageConverter converter = new ImageConverter();
byte[] imgArray = (byte[])converter.ConvertTo(imageIn, typeof(byte[]));

Why declare unicode by string in python?

That doesn't set the format of the string; it sets the format of the file. Even with that header, "hello" is a byte string, not a Unicode string. To make it Unicode, you're going to have to use u"hello" everywhere. The header is just a hint of what format to use when reading the .py file.

Removing body margin in CSS

I found this problem continued even when setting the BODY MARGIN to zero.

However it turns out there is an easy fix. All you need to do is give your HEADER tag a 1px border, aswell as setting the BODY MARGIN to zero, as shown below.

body { margin:0px; }

header { border:1px black solid; }

You may also need to change the MARGIN to zero for any H1, H2, etc. elements you have within your HEADER div. This will get rid of any extra space which may show around the text.

Not sure why this works, but I use Chrome browser. Obviously you can also change the colour of the border to match your header colour.

Controller 'ngModel', required by directive '...', can't be found

As described here: Angular NgModelController, you should provide the <input with the required controller ngModel

<input submit-required="true" ng-model="user.Name"></input>

How do I add a foreign key to an existing SQLite table?

Basically you cannot but you can bypass the situation.

The correct way to add the foreign key constraint to an existing table is the following command.

db.execSQL("alter table child add column newCol integer REFERENCES parent(parent_Id)");

Then copy the parent_Id data to the newCol and then delete the Parent_Id column. Hence, no need for temporary table.

Post-increment and Pre-increment concept?

Post increment(a++)

If int b = a++,then this means

int b = a;

a = a+1;

Here we add 1 to the value. The value is returned before the increment is made,

For eg a = 1; b = a++;

Then b=1 and a=2

Pre-increment (++a)

If int b = ++a; then this means

a=a+1;

int b=a ;

Pre-increment: This will add 1 to the main value. The value will be returned after the increment is made, For a = 1; b = ++a; Then b=2 and a=2.

How do I obtain the frequencies of each value in an FFT?

Your k^th FFT result's frequency is 2*pi*k/N.

SQL query for getting data for last 3 months

SELECT * 
FROM TABLE_NAME
WHERE Date_Column >= DATEADD(MONTH, -3, GETDATE())

Mureinik's suggested method will return the same results, but doing it this way your query can benefit from any indexes on Date_Column.

or you can check against last 90 days.

SELECT * 
FROM TABLE_NAME
WHERE Date_Column >= DATEADD(DAY, -90, GETDATE())

How to print the value of a Tensor object in TensorFlow?

You could print out the tensor value in session as follow:

import tensorflow as tf

a = tf.constant([1, 1.5, 2.5], dtype=tf.float32)
b = tf.constant([1, -2, 3], dtype=tf.float32)
c = a * b

with tf.Session() as sess:
    result = c.eval()
   
print(result)

HttpListener Access Denied

Unfortunately, for some reasons probably linked with HTTPS and certificates, the native .NET HttpListener requires admin privileges, and even for HTTP only protocol...

The good point

It is interesting to note that HTTP protocol is on top of TCP protocol, but launching a C# TCP listener doesn't require any admin privileges to run. In other words, it is conceptually possible to implement an HTTP server which do not requires admin privileges.

Alternative

Below, an example of project which doesn't require admin privileges: https://github.com/EmilianoElMariachi/ElMariachi.Http.Server

Retina displays, high-res background images

Here's a solution that also includes High(er)DPI (MDPI) devices > ~160 dots per inch like quite a few non-iOS Devices (f.e.: Google Nexus 7 2012):

.box {
    background: url( 'img/box-bg.png' ) no-repeat top left;
    width: 200px;
    height: 200px;
}
@media only screen and ( -webkit-min-device-pixel-ratio: 1.3 ),
       only screen and (    min--moz-device-pixel-ratio: 1.3 ),
       only screen and (      -o-min-device-pixel-ratio: 2.6/2 ), /* returns 1.3, see Dev.Opera */
       only screen and (         min-device-pixel-ratio: 1.3 ),
       only screen and ( min-resolution: 124.8dpi ),
       only screen and ( min-resolution: 1.3dppx ) {

       .box {
           background: url( 'img/[email protected]' ) no-repeat top left / 200px 200px;
       }

}

As @3rror404 included in his edit after receiving feedback from the comments, there's a world beyond Webkit/iPhone. One thing that bugs me with most solutions around so far like the one referenced as source above at CSS-Tricks, is that this isn't taken fully into account.
The original source went already further.

As an example the Nexus 7 (2012) screen is a TVDPI screen with a weird device-pixel-ratio of 1.325. When loading the images with normal resolution they are upscaled via interpolation and therefore blurry. For me applying this rule in the media query to include those devices succeeded in best customer feedback.

Common elements in two lists

Below code Remove common elements in the list

List<String> result =  list1.stream().filter(item-> !list2.contains(item)).collect(Collectors.toList());

Retrieve common elements

List<String> result = list1.stream()
                .distinct()
                .filter(list::contains)
                .collect(Collectors.toList());

How to fix homebrew permissions?

cd /usr/local && sudo chown -R $(whoami) bin etc include lib sbin share var opt Cellar Frameworks

How to write UTF-8 in a CSV file

From your shell run:

pip2 install unicodecsv

And (unlike the original question) presuming you're using Python's built in csv module, turn
import csv into
import unicodecsv as csv in your code.

How to create a shortcut using PowerShell

Beginning PowerShell 5.0 New-Item, Remove-Item, and Get-ChildItem have been enhanced to support creating and managing symbolic links. The ItemType parameter for New-Item accepts a new value, SymbolicLink. Now you can create symbolic links in a single line by running the New-Item cmdlet.

New-Item -ItemType SymbolicLink -Path "C:\temp" -Name "calc.lnk" -Value "c:\windows\system32\calc.exe"

Be Carefull a SymbolicLink is different from a Shortcut, shortcuts are just a file. They have a size (A small one, that just references where they point) and they require an application to support that filetype in order to be used. A symbolic link is filesystem level, and everything sees it as the original file. An application needs no special support to use a symbolic link.

Anyway if you want to create a Run As Administrator shortcut using Powershell you can use

$file="c:\temp\calc.lnk"
$bytes = [System.IO.File]::ReadAllBytes($file)
$bytes[0x15] = $bytes[0x15] -bor 0x20 #set byte 21 (0x15) bit 6 (0x20) ON (Use –bor to set RunAsAdministrator option and –bxor to unset)
[System.IO.File]::WriteAllBytes($file, $bytes)

If anybody want to change something else in a .LNK file you can refer to official Microsoft documentation.

How to stop the Timer in android?

We can schedule the timer to do the work.After the end of the time we set the message won't send.

This is the code.

Timer timer=new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
    @Override
    public void run() {
            //here you can write the code for send the message
        }
    }, 10, 60000);

In here the method we are calling is,

public void scheduleAtFixedRate (TimerTask task, long delay, long period)

In here,

task : the task to schedule

delay: amount of time in milliseconds before first execution.

period: amount of time in milliseconds between subsequent executions.

For more information you can refer: Android Developer

You can stop the timer by calling,

timer.cancel();

How to install mod_ssl for Apache httpd?

Try installing mod_ssl using following command:

yum install mod_ssl

and then reload and restart your Apache server using following commands:

systemctl reload httpd.service
systemctl restart httpd.service

This should work for most of the cases.

gson throws MalformedJsonException

From my recent experience, JsonReader#setLenient basically makes the parser very tolerant, even to allow malformed JSON data.

But for certain data retrieved from your trusted RESTful API(s), this error might be caused by trailing white spaces. In such cases, simply trim the data would avoid the error:

String trimmed = result1.trim();

Then gson.fromJson(trimmed, T) might work. Surely this only covers a special case, so YMMV.

How to implement iter(self) for a container object (Python)

One option that might work for some cases is to make your custom class inherit from dict. This seems like a logical choice if it acts like a dict; maybe it should be a dict. This way, you get dict-like iteration for free.

class MyDict(dict):
    def __init__(self, custom_attribute):
        self.bar = custom_attribute

mydict = MyDict('Some name')
mydict['a'] = 1
mydict['b'] = 2

print mydict.bar
for k, v in mydict.items():
    print k, '=>', v

Output:

Some name
a => 1
b => 2

PHPMailer - SMTP ERROR: Password command failed when send mail from my server

I face the same problem, and think that I do know why this happens.

The gmail account that I use is normally used from India, and the webserver that I use is located in The Netherlands.

Google notifies that there was a login attempt from am unusualy location and requires to login from that location via a web browser.

Furthermore I had to accept suspicious access to the gmail account via https://security.google.com/settings/security/activity

But in the end my problem is not yet solved, because I have to login to gmail from a location in The Netherlands.

I hope this will help you a little! (sorry, I do not read email replies on this email address)

Insert/Update Many to Many Entity Framework . How do I do it?

In entity framework, when object is added to context, its state changes to Added. EF also changes state of each object to added in object tree and hence you are either getting primary key violation error or duplicate records are added in table.

Liquibase lock - reasons?

You can safely delete the table manually or using query. It will be recreated automatically.

DROP TABLE DATABASECHANGELOGLOCK;

Is it ok to use `any?` to check if an array is not empty?

any? isn't the same as not empty? in some cases.

>> [nil, 1].any?
=> true
>> [nil, nil].any?
=> false

From the documentation:

If the block is not given, Ruby adds an implicit block of {|obj| obj} (that is any? will return true if at least one of the collection members is not false or nil).

jQuery ajax request with json response, how to?

Firstly, it will help if you set the headers of your PHP to serve JSON:

header('Content-type: application/json');

Secondly, it will help to adjust your ajax call:

$.ajax({
    url: "main.php",
    type: "POST",
    dataType: "json",
    data: {"action": "loadall", "id": id},
    success: function(data){
        console.log(data);
    },
    error: function(error){
         console.log("Error:");
         console.log(error);
    }
});

If successful, the response you receieve should be picked up as true JSON and an object should be logged to console.

NOTE: If you want to pick up pure html, you might want to consider using another method to JSON, but I personally recommend using JSON and rendering it into html using templates (such as Handlebars js).

Select single item from a list

List<string> items = new List<string>();

items.Find(p => p == "blah");

items.Find(p => p.Contains("b"));

but this allows you to define what you are looking for via a match predicate...

I guess if you are talking linqToSql then:

example looking for Account...

DataContext dc = new DataContext();

Account item = dc.Accounts.FirstOrDefault(p => p.id == 5);

If you need to make sure that there is only 1 item (throws exception when more than 1)

DataContext dc = new DataContext();

Account item = dc.Accounts.SingleOrDefault(p => p.id == 5);

"Proxy server connection failed" in google chrome

I had the same problem with a freshly installed copy of Chrome. If nothing works, and your Use a proxy server your LAN setting is unchecked, check it and then uncheck it . Believe it or not it might work. I don't know if I should consider it a bug or not.

Node.js Best Practice Exception Handling

Update: Joyent now has their own guide. The following information is more of a summary:

Safely "throwing" errors

Ideally we'd like to avoid uncaught errors as much as possible, as such, instead of literally throwing the error, we can instead safely "throw" the error using one of the following methods depending on our code architecture:

For synchronous code, if an error happens, return the error:

// Define divider as a syncrhonous function
var divideSync = function(x,y) {
    // if error condition?
    if ( y === 0 ) {
        // "throw" the error safely by returning it
        return new Error("Can't divide by zero")
    }
    else {
        // no error occured, continue on
        return x/y
    }
}

// Divide 4/2
var result = divideSync(4,2)
// did an error occur?
if ( result instanceof Error ) {
    // handle the error safely
    console.log('4/2=err', result)
}
else {
    // no error occured, continue on
    console.log('4/2='+result)
}

// Divide 4/0
result = divideSync(4,0)
// did an error occur?
if ( result instanceof Error ) {
    // handle the error safely
    console.log('4/0=err', result)
}
else {
    // no error occured, continue on
    console.log('4/0='+result)
}

For callback-based (ie. asynchronous) code, the first argument of the callback is err, if an error happens err is the error, if an error doesn't happen then err is null. Any other arguments follow the err argument:

var divide = function(x,y,next) {
    // if error condition?
    if ( y === 0 ) {
        // "throw" the error safely by calling the completion callback
        // with the first argument being the error
        next(new Error("Can't divide by zero"))
    }
    else {
        // no error occured, continue on
        next(null, x/y)
    }
}

divide(4,2,function(err,result){
    // did an error occur?
    if ( err ) {
        // handle the error safely
        console.log('4/2=err', err)
    }
    else {
        // no error occured, continue on
        console.log('4/2='+result)
    }
})

divide(4,0,function(err,result){
    // did an error occur?
    if ( err ) {
        // handle the error safely
        console.log('4/0=err', err)
    }
    else {
        // no error occured, continue on
        console.log('4/0='+result)
    }
})

For eventful code, where the error may happen anywhere, instead of throwing the error, fire the error event instead:

// Definite our Divider Event Emitter
var events = require('events')
var Divider = function(){
    events.EventEmitter.call(this)
}
require('util').inherits(Divider, events.EventEmitter)

// Add the divide function
Divider.prototype.divide = function(x,y){
    // if error condition?
    if ( y === 0 ) {
        // "throw" the error safely by emitting it
        var err = new Error("Can't divide by zero")
        this.emit('error', err)
    }
    else {
        // no error occured, continue on
        this.emit('divided', x, y, x/y)
    }

    // Chain
    return this;
}

// Create our divider and listen for errors
var divider = new Divider()
divider.on('error', function(err){
    // handle the error safely
    console.log(err)
})
divider.on('divided', function(x,y,result){
    console.log(x+'/'+y+'='+result)
})

// Divide
divider.divide(4,2).divide(4,0)

Safely "catching" errors

Sometimes though, there may still be code that throws an error somewhere which can lead to an uncaught exception and a potential crash of our application if we don't catch it safely. Depending on our code architecture we can use one of the following methods to catch it:

When we know where the error is occurring, we can wrap that section in a node.js domain

var d = require('domain').create()
d.on('error', function(err){
    // handle the error safely
    console.log(err)
})

// catch the uncaught errors in this asynchronous or synchronous code block
d.run(function(){
    // the asynchronous or synchronous code that we want to catch thrown errors on
    var err = new Error('example')
    throw err
})

If we know where the error is occurring is synchronous code, and for whatever reason can't use domains (perhaps old version of node), we can use the try catch statement:

// catch the uncaught errors in this synchronous code block
// try catch statements only work on synchronous code
try {
    // the synchronous code that we want to catch thrown errors on
    var err = new Error('example')
    throw err
} catch (err) {
    // handle the error safely
    console.log(err)
}

However, be careful not to use try...catch in asynchronous code, as an asynchronously thrown error will not be caught:

try {
    setTimeout(function(){
        var err = new Error('example')
        throw err
    }, 1000)
}
catch (err) {
    // Example error won't be caught here... crashing our app
    // hence the need for domains
}

If you do want to work with try..catch in conjunction with asynchronous code, when running Node 7.4 or higher you can use async/await natively to write your asynchronous functions.

Another thing to be careful about with try...catch is the risk of wrapping your completion callback inside the try statement like so:

var divide = function(x,y,next) {
    // if error condition?
    if ( y === 0 ) {
        // "throw" the error safely by calling the completion callback
        // with the first argument being the error
        next(new Error("Can't divide by zero"))
    }
    else {
        // no error occured, continue on
        next(null, x/y)
    }
}

var continueElsewhere = function(err, result){
        throw new Error('elsewhere has failed')
}

try {
        divide(4, 2, continueElsewhere)
        // ^ the execution of divide, and the execution of 
        //   continueElsewhere will be inside the try statement
}
catch (err) {
        console.log(err.stack)
        // ^ will output the "unexpected" result of: elsewhere has failed
}

This gotcha is very easy to do as your code becomes more complex. As such, it is best to either use domains or to return errors to avoid (1) uncaught exceptions in asynchronous code (2) the try catch catching execution that you don't want it to. In languages that allow for proper threading instead of JavaScript's asynchronous event-machine style, this is less of an issue.

Finally, in the case where an uncaught error happens in a place that wasn't wrapped in a domain or a try catch statement, we can make our application not crash by using the uncaughtException listener (however doing so can put the application in an unknown state):

// catch the uncaught errors that weren't wrapped in a domain or try catch statement
// do not use this in modules, but only in applications, as otherwise we could have multiple of these bound
process.on('uncaughtException', function(err) {
    // handle the error safely
    console.log(err)
})

// the asynchronous or synchronous code that emits the otherwise uncaught error
var err = new Error('example')
throw err

Java 8 Filter Array Using Lambda

Yes, you can do this by creating a DoubleStream from the array, filtering out the negatives, and converting the stream back to an array. Here is an example:

double[] d = {8, 7, -6, 5, -4};
d = Arrays.stream(d).filter(x -> x > 0).toArray();
//d => [8, 7, 5]

If you want to filter a reference array that is not an Object[] you will need to use the toArray method which takes an IntFunction to get an array of the original type as the result:

String[] a = { "s", "", "1", "", "" };
a = Arrays.stream(a).filter(s -> !s.isEmpty()).toArray(String[]::new);

What is the point of "Initial Catalog" in a SQL Server connection string?

This is the initial database of the data source when you connect.

Edited for clarity:

If you have multiple databases in your SQL Server instance and you don't want to use the default database, you need some way to specify which one you are going to use.

How to go up a level in the src path of a URL in HTML?

Use ../:

background-image: url('../images/bg.png');

You can use that as often as you want, e.g. ../../images/ or even at different positions, e.g. ../images/../images/../images/ (same as ../images/ of course)

How come I can't remove the blue textarea border in Twitter Bootstrap?

This worked for me

input[type=text]:focus{outline: none;}

i'm using bootstrap 3

How to bind WPF button to a command in ViewModelBase?

 <Grid >
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Button Command="{Binding ClickCommand}" Width="100" Height="100" Content="wefwfwef"/>
</Grid>

the code behind for the window:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModelBase();
    }
}

The ViewModel:

public class ViewModelBase
{
    private ICommand _clickCommand;
    public ICommand ClickCommand
    {
        get
        {
            return _clickCommand ?? (_clickCommand = new CommandHandler(() => MyAction(), ()=> CanExecute));
        }
    }
     public bool CanExecute
     {
        get
        {
            // check if executing is allowed, i.e., validate, check if a process is running, etc. 
            return true/false;
        }
     }

    public void MyAction()
    {

    }
}

Command Handler:

 public class CommandHandler : ICommand
{
    private Action _action;
    private Func<bool> _canExecute;

    /// <summary>
    /// Creates instance of the command handler
    /// </summary>
    /// <param name="action">Action to be executed by the command</param>
    /// <param name="canExecute">A bolean property to containing current permissions to execute the command</param>
    public CommandHandler(Action action, Func<bool> canExecute)
    {
        _action = action;
        _canExecute = canExecute;
    }

    /// <summary>
    /// Wires CanExecuteChanged event 
    /// </summary>
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    /// <summary>
    /// Forcess checking if execute is allowed
    /// </summary>
    /// <param name="parameter"></param>
    /// <returns></returns>
    public bool CanExecute(object parameter)
    {
        return _canExecute.Invoke();
    }

    public void Execute(object parameter)
    {
        _action();
    }
}

I hope this will give you the idea.

How to include route handlers in multiple files in Express?

This is possibly the most awesome stack overflow question/answer(s) ever. I love Sam's/Brad's solutions above. Thought I'd chime in with the async version that I implemented:

function loadRoutes(folder){
    if (!folder){
        folder = __dirname + '/routes/';
    }

    fs.readdir(folder, function(err, files){
        var l = files.length;
        for (var i = 0; i < l; i++){
            var file = files[i];
            fs.stat(file, function(err, stat){
                if (stat && stat.isDirectory()){
                    loadRoutes(folder + '/' + file + '/');
                } else {
                    var dot = file.lastIndexOf('.');
                    if (file.substr(dot + 1) === 'js'){
                        var name = file.substr(0, dot);

                        // I'm also passing argv here (from optimist)
                        // so that I can easily enable debugging for all
                        // routes.
                        require(folder + name)(app, argv);
                    }
                }
            });
        }
    });
}

My directory structure is a little different. I typically define routes in app.js (in the root directory of the project) by require-ing './routes'. Consequently, I'm skipping the check against index.js because I want to include that one as well.

EDIT: You can also put this in a function and call it recursively (I edited the example to show this) if you want to nest your routes in folders of arbitrary depth.

Postman Chrome: What is the difference between form-data, x-www-form-urlencoded and raw

Here are some supplemental examples to see the raw text that Postman passes in the request. You can see this by opening the Postman console:

form-data

Header

content-type: multipart/form-data; boundary=--------------------------590299136414163472038474

Body

key1=value1key2=value2

x-www-form-urlencoded

Header

Content-Type: application/x-www-form-urlencoded

Body

key1=value1&key2=value2

Raw text/plain

Header

Content-Type: text/plain

Body

This is some text.

Raw json

Header

Content-Type: application/json

Body

{"key1":"value1","key2":"value2"}

How to check if an integer is within a range?

You could do it using in_array() combined with range()

if (in_array($value, range($min, $max))) {
    // Value is in range
}

Note As has been pointed out in the comments however, this is not exactly a great solution if you are focussed on performance. Generating an array (escpecially with larger ranges) will slow down the execution.

PUT vs. POST in REST

The request methods GET, PUT and DELETE are CRUD (create, read, update and delete) operations—that is data management operations—on the state of a target resource (the one identified by the request URI):

GET should read the state of the target resource;
PUT should create or update the state of the target resource;
DELETE should delete the state of the target resource.

The request method POST is a different beast. It should not create the state of the target resource like PUT because it is a process operation with a higher-level goal than CRUD (cf. RFC 7231, § 4.3.3). The process may create a resource but different from the target resource, otherwise the lower-level goal request method PUT should be used, so even in this case that does not make it a CRUD operation.

The difference between CRUD operations (GET, PUT and DELETE in HTTP) and non-CRUD operations (POST in HTTP) is the difference between abstract data types and objects that Alan Kay was stressing in most of his talks and his ACM paper The Early History of Smalltalk:

What I got from Simula was that you could now replace bindings and assignments with goals. The last thing you wanted any programmer to do is mess with internal state even if presented figuratively. Instead, the objects should be presented as sites of higher level behaviors more appropriate for use as dynamic components.

[…] It is unfortunate that much of what is called "object-oriented programming" today is simply old style programming with fancier constructs. Many programs are loaded with "assignment-style" operations now done by more expensive attached procedures.

[…] Assignment statements—even abstract ones—express very low-level goals, and more of them will be needed to get anything done. […] Another way to think of all this is: though the late-binding of automatic storage allocations doesn’t do anything a programmer can’t do, its presence leads both to simpler and more powerful code. OOP is a late binding strategy for many things and all of them together hold off fragility and size explosion much longer than the older methodologies.

Google Chrome "window.open" workaround?

As far as I can tell, chrome doesn't work properly if you are referencing localhost (say, you're developing a site locally)

This works:

var windowObjectReference;
var strWindowFeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes";

function openRequestedPopup() {
  windowObjectReference = window.open("http://www.cnn.com/", "CNN_WindowName", strWindowFeatures);
}

This does not work

var windowObjectReference;
var strWindowFeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes";

function openRequestedPopup() {
  windowObjectReference = window.open("http://localhost/webappFolder/MapViewer.do", "CNN_WindowName", strWindowFeatures);
}

This also does not work, when loaded from http://localhost/webappFolder/Landing.do

var windowObjectReference;
var strWindowFeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes";

function openRequestedPopup() {
  windowObjectReference = window.open("/webappFolder/MapViewer.do", "CNN_WindowName", strWindowFeatures);
}

How to join components of a path when you are constructing a URL in Python

Rune Kaagaard provided a great and compact solution that worked for me, I expanded on it a little:

def urljoin(*args):
    trailing_slash = '/' if args[-1].endswith('/') else ''
    return "/".join(map(lambda x: str(x).strip('/'), args)) + trailing_slash

This allows all arguments to be joined regardless of trailing and ending slashes while preserving the last slash if present.

Remove a file from a Git repository without deleting it from the local filesystem

Above answers didn't work for me. I used filter-branch to remove all committed files.

Remove a file from a git repository with:

git filter-branch --tree-filter 'rm  file'

Remove a folder from a git repository with:

git filter-branch --tree-filter 'rm -rf directory'

This removes the directory or file from all the commits.

You can specify a commit by using:

git filter-branch --tree-filter 'rm -rf directory' HEAD

Or an range:

git filter-branch --tree-filter 'rm -rf vendor/gems' t49dse..HEAD

To push everything to remote, you can do:

git push origin master --force

Programs & Examples On #Acquia

Does Enter key trigger a click event?

Oracle: how to UPSERT (update or insert into a table?)

Closing a file after File.Create

Include files from parent or other directory

Changing Jenkins build number

Amazon S3 direct file upload from client browser - private key disclosure

Altering a column to be nullable

Laravel 5.2 - pluck() method returns array

Add new row to excel Table (VBA)

Formatting code in Notepad++

Row count with PDO

Running EXE with parameters

How to force deletion of a python object?

Regular Expressions and negating a whole character group

How to generate an openSSL key using a passphrase from the command line?

How to create a cron job using Bash automatically without the interactive editor?

Displaying splash screen for longer than default seconds

Default fetch type for one-to-one, many-to-one and one-to-many in Hibernate

Setting Different Bar color in matplotlib Python

Using request.setAttribute in a JSP page

What are all the uses of an underscore in Scala?

Single TextView with multiple colored text

Git Bash: Could not open a connection to your authentication agent

Is Eclipse the best IDE for Java?

How to set a value for a span using jQuery

Better/Faster to Loop through set or list?

How to create empty text file from a batch file?

How can I escape a double quote inside double quotes?

C# find highest array value and index

Bootstrap Modal sitting behind backdrop

How to get the max of two values in MySQL?

Loop through JSON in EJS

iOS9 Untrusted Enterprise Developer with no option to trust

reading and parsing a TSV file, then manipulating it for saving as CSV (*efficiently*)

Media Player called in state 0, error (-38,0)

Escape a string for a sed replace pattern

"FATAL: Module not found error" using modprobe

DataGridView - how to set column width?

Creating and throwing new exception

How to connect to LocalDB in Visual Studio Server Explorer?

ImportError: No module named tensorflow

Finding repeated words on a string and counting the repetitions

How to convert String to long in Java?

Wait for all promises to resolve

How do I trim whitespace from a string?

ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)

Where is my .vimrc file?

How can I show an element that has display: none in a CSS rule?

How to disable spring security for particular url

python - if not in list

Table fixed header and scrollable body

What does cherry-picking a commit with Git mean?

Python: Passing variables between functions

Java ArrayList of Arrays?

Why does modern Perl avoid UTF-8 by default?

Sort an ArrayList based on an object field

Using ExcelDataReader to read Excel data starting from a particular cell

Specifying Font and Size in HTML table

Uncompress tar.gz file

jQuery disable/enable submit button

Detect page change on DataTable

How to import Google Web Font in CSS file?

Replace a string in shell script using a variable

Equivalent of varchar(max) in MySQL?

Send FormData with other field in AngularJS

Nodejs cannot find installed module on Windows

Wildcards in jQuery selectors

C# Switch-case string starting with

Django model "doesn't declare an explicit app_label"

remote: repository not found fatal: not found

How to prevent user from typing in text field without disabling the field?

How To Set A JS object property name from a variable

How do I tell if a regular file does not exist in Bash?

Adding Multiple Values in ArrayList at a single index

The Response content must be a string or object implementing __toString(), "boolean" given after move to psql

Side-by-side plots with ggplot2

Add common prefix to all cells in Excel

How to see the actual Oracle SQL statement that is being executed

Creating a very simple 1 username/password login in php

reading and parsing a TSV file, then manipulating it for saving as CSV (efficiently)