`$log` first checks if the browser supports `console.log` (IE 8, for example, doesn&#39;t). This prevents errors being displayed on IE 8. Note: this doesn&#39;t mean it will log anything on IE 8, it simply means it won&#39;t throw the error.

Next to that, it also allows you to [decorate](https://docs.angularjs.org/guide/decorators) and mock `$log` for extending and testing purposes, if you are so inclined. You could for example decorate it to log to an array for IE 8 support.

A bonus feature: if you pass it a JavaScript `Error` instance, it will attempt to format it nicely. This can be found out by reading the [source code](https://github.com/angular/angular.js/blob/master/src/ng/log.js#L134).

**EDIT:** &quot;It is not that IE 8 doesn&#39;t support console.log. It just doesn&#39;t create the console object until the dev tools are opened.&quot; See comments below for more details.

Just to complete [*@Steve&#39;s answer*][1] (which is correct), `$log` also has the advantage of being **turned off**. Using this code you can disable the logging from [`$log`][2]:

    app.config(function($logProvider) {
      $logProvider.debugEnabled(true);
    });



This is very handy if you want to disable all logs at once, rather than delete them line by line manually.


  [1]: https://stackoverflow.com/a/24185961/4927984
  [2]: https://docs.angularjs.org/api/ng/service/$log

I need to run the command  `date | grep -o -w &#39;&quot;+tz+&quot;&#39;&#39; | wc -w ` using Python on my localhost. I am using `subprocess` module for the same and using the `check_output` method as I need to capture the output for the same.

However it is throwing me an error :


    Traceback (most recent call last):
      File &quot;test.py&quot;, line 47, in &lt;module&gt;
        check_timezone()
      File &quot;test.py&quot;, line 40, in check_timezone
        count = subprocess.check_output(command)
      File &quot;/usr/lib/python2.7/subprocess.py&quot;, line 537, in check_output
        process = Popen(stdout=PIPE, *popenargs, **kwargs)
      File &quot;/usr/lib/python2.7/subprocess.py&quot;, line 679, in __init__
        errread, errwrite)
      File &quot;/usr/lib/python2.7/subprocess.py&quot;, line 1249, in _execute_child
        raise child_exception-
    OSError: [Errno 2] No such file or directory


File not found error when launching a subprocess containing piped commands

I&#39;m asking this (somehow) simple question just to be finicky, because sometimes I&#39;m worried about a misuse I might be doing of many UIView&#39;s APIs, especially when it comes to autolayout.

To make it super simple I&#39;ll go with an example, let&#39;s assume I need an UIView subclass that has an image icon and a multiline label; the behaviour I want is that the height of my view changes with the height of the label (to fit the text inside), also, I&#39;m laying it out with Interface builder, so I have something like this:

![simple view image][1]

with some constraints that give fixed width and height to the image view, and fixed width and position (relative to the image view) to the label:

![simple view image, constraints shown][2]

Now, if I set  some text to the label, I want the view to be resized in height to fit it properly, or remain with the same height it has in the xib.
Before autolayout I would have done always something like this:

In the CustoView subclass file I would have overridden `sizeThatFits:` like so:

    - (CGSize) sizeThatFits:(CGSize)size{
    
        //this stands for whichever method I would have used
        //to calculate the height needed to display the text based on the font
        CGSize labelSize = [self.titleLabel intrinsicContentSize];
        
        //check if we&#39;re bigger than what&#39;s in ib, otherwise resize
        CGFloat newHeight = (labelSize.height &lt;= 21) ? 51: labelSize.height+20;
        
        size.height = newHeight;

        return size;

    }

And than I would have called something like:

    myView.titleLabel.text = @&quot;a big text to display that should be more than a line&quot;;
    [myView sizeToFit];

Now, thinking in constraints, I know that autolayout systems calls `intrinsicContentSize` on the view tree elements to know what their size is and make its calculations, therefore I should override `intrinsicContentSize` in my subview to return the exact same things it returns in the `sizeThatFits:` method previously shown, except for the fact that, previously, when calling `sizeToFit` I had my view properly resized, but now with autolayout, in combination with a xib, this is not going to happen.

Of course I might be calling `sizeToFit` every time I edit text in my subclass, along with an overridden `intrinsicContentSize` that returns the exact same size of `sizeThatFits:`, but somehow I don&#39;t think this is the proper way of doing it.

I was thinking about overriding `needsUpdateConstraints` and `updateConstraints`, but still makes not much sense since my view&#39;s width and height are inferred and translated from autoresizing mask from the xib.

So long, what do you think is the cleanest and most correct way to make exactly what I show here and support fully autolayout? 

  [1]: http://i.stack.imgur.com/P5GvC.png
  [2]: http://i.stack.imgur.com/XsKSt.png

Proper usage of intrinsicContentSize and sizeThatFits: on UIView Subclass with autolayout

I understand it is a best practice in angular to use `$log` instead of `console.log`.
However, I can&#39;t find good documentation explaining the reasons.  Why should a developer use `$log`?

Why use angular&#39;s $log instead of console.log?

<p>I understand it is a best practice in angular to use <code>$log</code> instead of <code>console.log</code>.
However, I can't find good documentation explaining the reasons.  Why should a developer use <code>$log</code>?</p>


According to [the API docs](https://code.angularjs.org/1.3.0-beta.11/docs/api/ng/service/$compile#-replace-deprecated-will-be-removed-in-next-major-release-), directives&#39; `replace` attribute is deprecated, so in the future, all directives will behave with the current default of `replace: false`.

This removes developers&#39; ability to replace an element directive&#39;s element, with no apparent replacement for this functionality.

See [this plunk](http://plnkr.co/uQGHI1) for an example of how element directives work with and without `replace: true`.

Why is this useful attribute being deprecated with no replacement?

Why is `replace` property deprecated in AngularJS directives?

I am using bootstrap date-picker in my angular application. However when I select a date from that date-picker underlying ng-model that I have bind gets updated I want that ng-model in one date format &#39;MM/dd/yyyy&#39;. but it every times makes date like this 

    &quot;2009-02-03T18:30:00.000Z&quot;

instead of 

    02/04/2009

I have created a plunkr for the same [plunkr link][1]

My Html and controller code is like below

    &lt;!doctype html&gt;
    &lt;html ng-app=&quot;plunker&quot;&gt;
      &lt;head&gt;
        &lt;script src=&quot;//ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.js&quot;&gt;&lt;/script&gt;
        &lt;script src=&quot;//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11.0.js&quot;&gt;&lt;/script&gt;
        &lt;script src=&quot;example.js&quot;&gt;&lt;/script&gt;
        &lt;link href=&quot;//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css&quot; rel=&quot;stylesheet&quot;&gt;
      &lt;/head&gt;
      &lt;body&gt;
    
    &lt;div ng-controller=&quot;DatepickerDemoCtrl&quot;&gt;
        &lt;pre&gt;Selected date is: &lt;em&gt;{{dt | date:&#39;MM/dd/yyyy&#39; }}&lt;/em&gt;&lt;/pre&gt;
        &lt;p&gt;above filter will just update above UI but I want to update actual ng-modle&lt;/p&gt;
        
    
        &lt;h4&gt;Popup&lt;/h4&gt;
        &lt;div class=&quot;row&quot;&gt;
            &lt;div class=&quot;col-md-6&quot;&gt;
                &lt;p class=&quot;input-group&quot;&gt;
                  &lt;input type=&quot;text&quot; class=&quot;form-control&quot;
                  datepicker-popup=&quot;{{format}}&quot; 
                  ng-model=&quot;dt&quot;
                  is-open=&quot;opened&quot; min-date=&quot;minDate&quot;
                  max-date=&quot;&#39;2015-06-22&#39;&quot; 
                  datepicker-options=&quot;dateOptions&quot; 
                  date-disabled=&quot;disabled(date, mode)&quot; 
                  ng-required=&quot;true&quot; close-text=&quot;Close&quot; /&gt;
                  &lt;span class=&quot;input-group-btn&quot;&gt; 
                    &lt;button type=&quot;button&quot; class=&quot;btn btn-default&quot; ng-click=&quot;open($event)&quot;&gt;
                    &lt;i class=&quot;glyphicon glyphicon-calendar&quot;&gt;&lt;/i&gt;&lt;/button&gt;
                  &lt;/span&gt;
                &lt;/p&gt;
            &lt;/div&gt;
        &lt;/div&gt;
        &lt;!--&lt;div class=&quot;row&quot;&gt;
            &lt;div class=&quot;col-md-6&quot;&gt;
                &lt;label&gt;Format:&lt;/label&gt; &lt;select class=&quot;form-control&quot; ng-model=&quot;format&quot; ng-options=&quot;f for f in formats&quot;&gt;&lt;option&gt;&lt;/option&gt;&lt;/select&gt;
            &lt;/div&gt;
        &lt;/div&gt;--&gt;
    
        &lt;hr /&gt;
        {{dt}}
    &lt;/div&gt;
      &lt;/body&gt;
    &lt;/html&gt;

**Angular controller**

    angular.module(&#39;plunker&#39;, [&#39;ui.bootstrap&#39;]);
    var DatepickerDemoCtrl = function ($scope) {
    
    
      $scope.open = function($event) {
        $event.preventDefault();
        $event.stopPropagation();
    
        $scope.opened = true;
      };
    
      $scope.dateOptions = {
        formatYear: &#39;yy&#39;,
        startingDay: 1
      };
    
     
      $scope.format = &#39;dd-MMMM-yyyy&#39;;
    };
Thanks in advance for review my question.

**UPDATE**

I am calling below method for posting my data and VAR is array of size 900 which contains date-picker variables. 

    public SaveCurrentData(formToSave: tsmodels.ResponseTransferCalculationModelTS) {
    
            var query = this.EntityQuery.from(&#39;SaveFormData&#39;).withParameters({
                $method: &#39;POST&#39;,
                $encoding: &#39;JSON&#39;,
                $data: {
                    VAR: formToSave.VAR,
                    X: formToSave.X,
                    CurrentForm: formToSave.currentForm,
                }
            });
    
            var deferred = this.q.defer();
    
            this.manager.executeQuery(query).then((response) =&gt; {
                deferred.resolve(response);
            }, (error) =&gt; {
                    deferred.reject(error);
                });
    
            return deferred.promise;
        }

  [1]: http://plnkr.co/edit/AtjFPbGggVvLLvz69BvH?p=preview

Angular bootstrap datepicker date format does not format ng-model value

I am using a Bootstrap dropdown menu. The problem is that it never drops down upon the first click; I need to click 2 times for it to be toggled. I guess the click event is somehow getting stuck somewhere before propagating down...

Is there any way to fix that?

Avoid having to double-click to toggle Bootstrap dropdown

Let&#39;s say you have something like:

    &lt;div class=&quot;parent&quot;&gt;
        &lt;input class=&quot;childInput&quot; type=&quot;text&quot; /&gt;
        &lt;div class=&quot;sibling&quot;&gt;&lt;/div&gt;
    &lt;/div&gt;


I want to change the appearance of the parent/siblings when the child receives focus. Are there any CSS tricks for doing stuff like this?

&lt;b&gt;Edit:&lt;/b&gt;

The reason for my question is as follows:

I&#39;m creating an Angular app which needs editable text fields. It should look like a label until it is clicked, at which point it should look like a normal text input. I styled the text field based on :focus to achieve this effect, but the text is cut off by text input&#39;s boundaries. I also used ng-show, ng-hide, ng-blur, ng-keypress and ng-click to switch between the label and the text input based on blurs, key presses and clicks. This worked fine except for one thing: After the label&#39;s ng-click=&quot;setEdit(this, $event)&quot; changes the edit boolean used by ng-show and ng-hide to true, it uses a jQuery call to .select() the text input. However, it isn&#39;t until after the completion of the ng-click that everything is $digest&#39;d, so the text input loses focus again. Since the text input never actually receives focus, using ng-blur to revert back to showing the label is buggy: The user has to click in the text input and then click out of it again to revert back to showing the label.

&lt;b&gt;Edit:&lt;/b&gt;

Here&#39;s an example plunk of the issue: http://plnkr.co/edit/synSIP?p=preview

CSS: Change parent on focus of child

I want to know is how to use multiple controllers for a single page application. I have tried to figure it out and I&#39;ve found questions very similar to mine, but there is just a ton of different answers solving a specific problem where you end up not using multiple controllers for a single page app.

Is that because it would not be wise to use multiple controllers for a single page? Or is it just not possible?

Let&#39;s say I already have a kick-ass image carousel controller working the main page, but then I learn how to (let&#39;s say) use modals and I need a new controller for that as well (or any other thing I need a controller). What will I do then?

I have seen some answers to other questions where they ask about almost the same things as me and people answer &quot;*OMG. Why would you even do that, just do this...&quot;. 

What is the best way, or how do you do it?

**Edit**

Many of you are answering to just declare two controllers and then use ng-controller to call it.
I use this bit of code below and then call MainCtrl with ng-controller. 

    app.config(function($routeProvider, $locationProvider) {                        
      $routeProvider                                                                
           .when(&#39;/&#39;, {                                            
             templateUrl: &quot;templates/main.html&quot;,                                               
             controller:&#39;MainCtrl&#39;,                                
            })                                                                      
            .otherwise({                      
                template: &#39;does not exists&#39;   
            });      
    });

Why do I even need to set a controller here if I can just use ng-controller without it? This is what confused me. (and you can&#39;t add two controllers this way, I think...)

Multiple controllers with AngularJS in single page app

As disscussed in this link : [https://stackoverflow.com/questions/6072389/how-to-create-a-own-appender-in-log4j][1]

For creating a custom appender in log4j 1.x we have to extend the AppenderSkeleton class and implements its append method.

Similarly How we can create a custom appender in log4j2 as we dont have AppenderSkelton class to extend and all other appender extend AppenderBase class .


  [1]: https://stackoverflow.com/questions/6072389/how-to-create-a-own-appender-in-log4j

How to Create a Custom Appender in log4j2?

How do I log all the headers the client (browser) has sent in Nginx? I also want to log the response headers. Note that I am using nginx as reverse proxy. 

After going through documentation, I understand that I can log a specific header, but I want to log all of the headers. 

How to log all headers in nginx?

I am using windows 7 and python 2.7.
I want to limit my log file size to 5MB.
My app, when it starts, writes to log file, and then the app terminates.
When my app starts again, it will write in same log file. So app is not continuously running.
App initiates, processes and terminates.

My code for logging is:

    import logging
    import logging.handlers
    logging.basicConfig(filename=logfile.log, level=&quot;info&quot;, format=&#39;%(asctime)s %(levelname)s %(funcName)s(%(lineno)d) %(message)s&#39;)
    logging.info(&quot;*************************************************&quot;)


I tried with **RotatingFileHandler** but it didn&#39;t work

    logging.handlers.RotatingFileHandler(logFile, mode=&#39;a&#39;, maxBytes=5*1024*1024, backupCount=2, encoding=None, delay=0)


So, how can I enforce a file size limit in python?




How to limit log file size in python

How would I go about starting an application in my host machine in order to read files and stdout from a running docker container? 


Essentially I want to do this:

    docker start containerid   
    ./myapp // This app will *somehow* have access files and stdout generated by the container I just stared. 

How would I go about doing that? To be more specific with where I am trying to go with this; I want to read the logs and stdout of a docker container and have those logs processed somewhere else. 

I am also willing to create another docker container which can read files and stdout from another container, but I don&#39;t know if that&#39;s possible.

How to read files and stdout from a running Docker container

I&#39;m trying to generate a JSON log from nginx.

I&#39;m aware of solutions like [this one][1] but some of the fields I want to log include user generated input (like HTTP headers) which need to be escaped properly.

I&#39;m aware of the nginx changelog entries from Oct 2011 and May 2008 that say:

    *) Change: now the 0x7F-0x1F characters are escaped as \xXX in an
       access_log.
    *) Change: now the 0x00-0x1F, &#39;&quot;&#39; and &#39;\&#39; characters are escaped as \xXX
       in an access_log.

but this still doesn&#39;t help since `\xXX` is [invalid in a JSON string][2].

I&#39;ve also looked at [the HttpSetMiscModule][3] module which has a `set_quote_json_str` directive, but this just seems to add `\x22` around the strings which doesn&#39;t help.

Any idea for other solutions to log in JSON format from nginx?

  [1]: http://blog.pkhamre.com/2012/08/23/logging-to-logstash-json-format-in-nginx
  [2]: http://json.org/
  [3]: http://wiki.nginx.org/HttpSetMiscModule

Content Type	Original Author	Original Content on Stackoverflow
Question	user3141592	View Question on Stackoverflow
Solution 1 - Angularjs	Steve Klösters	View Answer on Stackoverflow
Solution 2 - Angularjs	Mistalis	View Answer on Stackoverflow

Why use angular's $log instead of console.log?

Angularjs Problem Overview

Angularjs Solutions

Solution 1 - Angularjs

Solution 2 - Angularjs

Proper usage of intrinsicContentSize and sizeThatFits: on UIView Subclass with autolayout

File not found error when launching a subprocess containing piped commands

Attributions