All the while I was doing  `.style(&quot;fill&quot;, &quot;darkOrange&quot;)`

Then I found out the **correct answer** is 

 `.style(&#39;fill&#39;, &#39;darkOrange&#39;)`

I would appreciate if someone could suggest the optimal number of shards per ES node for optimal performance or provide any recommended way to arrive at the number of shards one should use, given the number of cores and memory foot print.

ElasticSearch - Optimal number of Shards per node

I have a one to many association between jobs and companies and it works fine. In the job form view I have text_field for the company name with an autocomplete feature. The autocomplete works fine but the find_or_create_by don&#39;t create a new company if I put a company name that doesn&#39;t exist in the autocomplete list.

      def company_name
        company.try(:name)
      end
      
      def company_name=(name)
        @company = Company.find_or_create_by(name: name)
      end

Rails 4 find or create by method doesn&#39;t work

I have my d3 chart title, text append on the svg as per below:

    svg.append(&quot;text&quot;)
        .attr(&quot;x&quot;, (width / 2))             
        .attr(&quot;y&quot;, 0)
        .attr(&quot;text-anchor&quot;, &quot;middle&quot;)	
        .style(&quot;font-size&quot;, &quot;14px&quot;)
        .text(text);

reference [here][1]

But I would like to set the text color to some other color. Is that possible?


  [1]: http://www.d3noob.org/2012/12/adding-axis-labels-to-d3js-graph.html

How to set text color for my d3 chart title?

I have my d3 chart title, text append on the svg as per below:
<pre><code class="hljs language-arduino">svg.append("text")
 .attr("x", (width / 2)) 
 .attr("y", 0)
 .attr("text-anchor", "middle")	
 .style("font-size", "14px")
 .text(text);
</code></pre>
reference <a href="http://www.d3noob.org/2012/12/adding-axis-labels-to-d3js-graph.html" target="_blank" rel="noopener noreferrer">here</a>
But I would like to set the text color to some other color. Is that possible?

Currently in ES5 many of us are using the following pattern in frameworks to create classes and class variables, which is comfy:

&lt;!-- language-all: lang-js --&gt;
    
    // ES 5
    FrameWork.Class({
    
        variable: &#39;string&#39;,
        variable2: true,
    
        init: function(){
            
        },

        addItem: function(){
            
        }
    
    });

In ES6 you can create classes natively, but there is no option to have class variables:

    // ES6
    class MyClass {
        const MY_CONST = &#39;string&#39;; // &lt;-- this is not possible in ES6
        constructor(){
            this.MY_CONST;
        }
    }

Sadly, the above won&#39;t work, as classes only can contain methods. 

I understand that I can `this.myVar = true` in `constructor`…but I don&#39;t want to &#39;junk&#39; my constructor, especially when I have 20-30+ params for a bigger class.

I was thinking of many ways to handle this issue, but haven&#39;t yet found any good ones. (For example: create a `ClassConfig` handler, and pass a `parameter` object, which is declared separately from the class. Then the handler would attach to the class. I was thinking about `WeakMaps` also to integrate, somehow.)

What kind of ideas would you have to handle this situation?

ES6 class variable alternatives

I’m trying out webpack (http://webpack.github.io/) and it looks really nice, however I’m kind of stuck here.

Say that I’m using a CDN for a library, f.ex jQuery. Then in my code, I want the `require(&#39;jquery&#39;)` to automatically point to the global jquery instance, instead of trying to include it from my modules.

I’ve tried using plugins like the `IgnorePlugin`:

    new webpack.IgnorePlugin(new RegExp(&quot;^(jquery|react)$&quot;))

This works for ignoring the library, but it still says that the required module is &quot;missing&quot; when I run the webpacker.

Somehow I need to tell webpack that `jquery` should be picked up from the global context instead. Seems like a common use case, so I’m kind of surprised that the docs doesn’t target this specifically.

Webpack and external libraries

HTML: 

    &lt;ul ng-repeat=&quot;task in tasks&quot;&gt;
        &lt;li ng-mouseover=&quot;hoverIn()&quot; ng-mouseleave=&quot;hoverOut()&quot;&gt;{{task.name}}&lt;/li&gt;
        &lt;span ng-show=&quot;hoverEdit&quot;&gt;&lt;a&gt;Edit&lt;/a&gt;&lt;/span&gt;
    &lt;/ul&gt;
      
JS:

    $scope.hoverIn = function(){
    	$scope.hoverEdit = true;
    };
    
    $scope.hoverOut = function(){
    	$scope.hoverEdit = false;
    };

The code is ridiculous because I think it&#39;s too much. I think it can be simplified. Anyway the result toggle all the item once it&#39;s hovered. I&#39;ve jQuery background, so I have no idea how to make single item work in `ng-repeat`.


ng-mouseover and leave to toggle item using mouse in angularjs

I am new to AngularJS, and I am a little confused of how I can use angular-&quot;ui-router&quot; in the following scenario:

I am building a web application which consists of two sections. The first section is the homepage with its login and signup views, and the second section is the dashboard (after successful login).

I have created an `index.html` for the home section with its angular app and `ui-router` config to handle `/login` and `/signup` views,
and there is another file `dashboard.html` for the dashboard section with its app and `ui-router` config to handle many sub views.

Now I finished the dashboard section and don&#39;t know how to combine the two sections with their different angular apps. How could I tell the home app to redirect to the dashboard app?

AngularJS ui-router login authentication

How do I optionally include an element in JSX?  Here is an example using a banner that should be in the component if it has been passed in.  What I want to avoid is having to duplicate HTML tags in the if statement.

    render: function () {
        var banner;
        if (this.state.banner) {
            banner = &lt;div id=&quot;banner&quot;&gt;{this.state.banner}&lt;/div&gt;;
        } else {
            banner = ?????
        }
        return (
            &lt;div id=&quot;page&quot;&gt;
                {banner}
                &lt;div id=&quot;other-content&quot;&gt;
                    blah blah blah...
                &lt;/div&gt;
            &lt;/div&gt;
        );
    }



How to have conditional elements and keep DRY with Facebook React&#39;s JSX?

Why won&#39;t my input resize when I change the type to `type=&quot;number&quot;` but it works with `type=&quot;text&quot;`?

[EXAMPLE][1]


        Email: &lt;input type=&quot;text&quot; name=&quot;email&quot; size=&quot;10&quot;&gt;&lt;br/&gt;
      number: &lt;input type=&quot;number&quot; name=&quot;email&quot; size=&quot;10&quot;&gt;



  [1]: http://jsfiddle.net/Ex5JZ/1/

Input type &quot;number&quot; won&#39;t resize

I am trying to find the bounding boxes of text in an image and am currently using this approach:

    // calculate the local variances of the grayscale image
    Mat t_mean, t_mean_2;
    Mat grayF;
    outImg_gray.convertTo(grayF, CV_32F);
    int winSize = 35;
    blur(grayF, t_mean, cv::Size(winSize,winSize));
    blur(grayF.mul(grayF), t_mean_2, cv::Size(winSize,winSize));
    Mat varMat = t_mean_2 - t_mean.mul(t_mean);
    varMat.convertTo(varMat, CV_8U);
    
    // threshold the high variance regions
    Mat varMatRegions = varMat &gt; 100;

When given an image like this:

![enter image description here][1]

Then when I show `varMatRegions` I get this image:

![enter image description here][2]

As you can see it somewhat combines the left block of text with the header of the card, for most cards this method works great but on busier cards it can cause problems. 

The reason it is bad for those contours to connect is that it makes the bounding box of the contour nearly take up the entire card.

Can anyone suggest a different way I can find the text to ensure proper detection of text?


**200 points to whoever can find the text in the card above the these two.**

![enter image description here][3]
![enter image description here][4]


  [1]: http://i.stack.imgur.com/VfDfJ.png
  [2]: http://i.stack.imgur.com/64wu4.png
  [3]: http://i.stack.imgur.com/7h4SJ.jpg
  [4]: http://i.stack.imgur.com/8ipeJ.jpg

Extracting text OpenCV

I have spent hours looking in the documentation and on StackOverflow, but no solution seems to solve my problem. When using `ggplot` I can&#39;t get the right text in the legend, even though it&#39;s in my  dataframe. I have tried `scale_colour_manual`, `scale_fill_manual` with different values for `labels=` such as `c(&quot;T999&quot;, &quot;T888&quot;)&quot;, &quot;cols&quot;`.

Here is my code:

    T999 &lt;- runif(10, 100, 200)
    T888 &lt;- runif(10, 200, 300)
    TY &lt;- runif(10, 20, 30)
    df &lt;- data.frame(T999, T888, TY)


    ggplot(data = df, aes(x=T999, y=TY, pointtype=&quot;T999&quot;)) + 
           geom_point(size = 15, colour = &quot;darkblue&quot;) + 
           geom_point(data = df, aes(x=T888, y=TY), colour = &#39;red&#39;, size = 10 ) + 
           theme(axis.text.x = element_text(size = 20), axis.title.x =element_text(size = 20),   axis.text.y = element_text(size = 20)) +
           xlab(&quot;Txxx&quot;) + ylab(&quot;TY [&#176;C]&quot;) + labs(title=&quot;temperatures&quot;, size = 15) + 
           scale_colour_manual(labels = c(&quot;T999&quot;, &quot;T888&quot;), values = c(&quot;darkblue&quot;, &quot;red&quot;)) +    theme(legend.position=&quot;topright&quot;)

Help would be very appreciated!


Editing legend (text) labels in ggplot

How would I go about changing the color of the `UINavigationBar` in Swift?

Most things online say to do something like:

    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];


Which I translated to 

    let titleDict: NSDictionary = [&quot;NSForegroundColorAttributeName&quot;: UIColor.whiteColor()]
    self.navigationController.navigationBartitleTextAttributes = titleDict
    //self is referring to a UIViewController

But it doesn&#39;t work.  I already changed the background and button colors, but the text color doesn&#39;t change.  Any ideas?

UINavigationBar Text Color in Swift

I am trying to add a text field onto my Android app in Eclipse, but then I drag the `Plain text` option on to the graphical layout, a message at the bottom comes up. It reads
`Exception raised during rendering: java.lang.System.arraycopy([CI[CII)V
Exception details are logged in Window &gt; Show View &gt; Error Log`
Even when I go to `Window &gt; Show View` there is no error log option. The whole designer is useless now, because I can not use it anymore until I delete the `EditText` directly from the xml. What is causing this error, and how do I fix it? I am running the latest version (as of today, 6-30-14), and Windows 8 Pro x64.

Here is my full layout code:

    &lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    xmlns:tools=&quot;http://schemas.android.com/tools&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot;
    tools:context=&quot;${relativePackage}.${activityClass}&quot; &gt;

    &lt;TextView
        android:id=&quot;@+id/textView1&quot;
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_alignParentTop=&quot;true&quot;
        android:layout_centerHorizontal=&quot;true&quot;
        android:layout_marginTop=&quot;18dp&quot;
        android:text=&quot;@string/welcome_text&quot; /&gt;

    &lt;EditText
        android:id=&quot;@+id/editText1&quot;
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_centerHorizontal=&quot;true&quot;
        android:layout_centerVertical=&quot;true&quot;
        android:ems=&quot;10&quot;
        android:inputType=&quot;text&quot;&gt;

        &lt;requestFocus /&gt;
    &lt;/EditText&gt;

    &lt;/RelativeLayout&gt;

Android app in Eclipse: Edit text not showing on Graphical layout

Given:

    &lt;body&gt;
        &lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; xmlns:xlink=&quot;http://www.w3.org/1999/xlink&quot;&gt;
            &lt;a xlink:href=&quot;url&quot;&gt;&lt;/a&gt;
        &lt;/svg&gt;
    &lt;/body&gt;

Is it possible to use the HTML DOM&#39;s `.querySelector()` or `.querySelectorAll()` to select the link inside the SVG by the contents of its `xlink:href` attribute?

This works:

    document.querySelector(&#39;a&#39;)                    // &lt;a xlink:href=&quot;url&quot;/&gt;

These don&#39;t:

    document.querySelector(&#39;[href=&quot;url&quot;]&#39;)         // null
    document.querySelector(&#39;[xlink:href=&quot;url&quot;]&#39;)   // Error: not a valid selector
    document.querySelector(&#39;[xlink\:href=&quot;url&quot;]&#39;)  // Error: not a valid selector
    document.querySelector(&#39;[xlink\\:href=&quot;url&quot;]&#39;) // null

Is there a way of writing that attribute selector to make it &#39;see&#39; the `xlink:href`?


Is it possible to use HTML&#39;s .querySelector() to select by xlink attribute in an SVG?

I&#39;m currently building a website aimed at modern browsers and mobile devices. In terms of performance, is it better to inline SVG&#39;s directly inside the HTML using `&lt;svg&gt;` or is it better to use `&lt;img&gt;` and/or background-image instead. I run gzip on the server to further compress my content and prefer not to rely on Javascript.

Inline SVG vs SVG File Performance

I currently have a website using D3 and I&#39;d like the user to have the option to save the SVG as an SVG file. I&#39;m using crowbar.js to do this, but it only works on chrome. Nothing happens of safari and IE gives an access denied on the `click()` method used in crowbar.js to download the file.

    var e = document.createElement(&#39;script&#39;); 
                
    if (window.location.protocol === &#39;https:&#39;) { 
        e.setAttribute(&#39;src&#39;, &#39;https://raw.github.com/NYTimes/svg-crowbar/gh-pages/svg-crowbar.js&#39;); 
    } else { 
        e.setAttribute(&#39;src&#39;, &#39;http://nytimes.github.com/svg-crowbar/svg-crowbar.js&#39;); 
    }
    
    e.setAttribute(&#39;class&#39;, &#39;svg-crowbar&#39;); 
    document.body.appendChild(e);

How do I download an SVG file based on the SVG element on my website in safari, IE and chrome?


How do I save/export an SVG file after creating an SVG with D3.js (IE, safari and chrome)?

Is is possible to embed SVG markup into a ReactJS component? 

    render: function() {
      return (
        &lt;span&gt;
          &lt;svg version=&quot;1.1&quot; id=&quot;Layer_1&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot; xmln ...
        &lt;/span&gt;
      );
    }

Results in the error: 

&gt; Namespace attributes are not supported. ReactJSX is not XML.

What is the lightest way of doing this. Using something like [React ART][1] is way overkill for what I&#39;m trying to do.


  [1]: https://github.com/facebook/react-art

Embedding SVG into ReactJS

I would like to make a **transparent arrow over an image**. This triangle should be indented in a semi transparent block and show the background image.

Desired output:

![transparent indented CSS triangle][1]


&lt;!-- begin snippet: js hide: true console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .barShow {
      background-color: #000;
      opacity: 0.5;
    }

    .barShow:before {
      top: 0%;
      left: 50%;
      border: solid transparent;
      content: &quot; &quot;;
      height: 0;
      width: 0;
      position: absolute;
      pointer-events: none;
      border-top-color: #999;
      border-width: 20px;
      margin-left: -20px;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;barShow&quot;&gt;&lt;/div&gt;

&lt;!-- end snippet --&gt;

The **transparent CSS Arrow** should be transparent without color.


  [1]: https://i.stack.imgur.com/Yn7EK.jpg

Transparent arrow/triangle indented over an image

The colors in [this][1] table is all not transparent. I guess the value for the `A` is set to `FF`.

What is the code for transparency? 

For example this color FFF0F8FF (AliceBlue), to a transparent code such as `??F0F8FF` ?


  [1]: http://msdn.microsoft.com/en-us/library/system.windows.media.colors.aspx

Transparent ARGB hex value

as per title, my question is: Does Android provide any way to analyze/determine if a color (that will be obviously dynamic for the purpose) is light or dark?



Check if color is dark or light in Android

I try to style checkbox background color, but it won&#39;t change whatever I do. I am using firefox 29 latest.

Is there some rule changes in css or may be in the browser?

**CSS:**

    input[type=&quot;checkbox&quot;] {
        background: #990000;    
    }
    
    .chk {
       background-color: #990000;  
        
    }

Here is a demo http://jsfiddle.net/6KXRg/


Why cannot change checkbox color whatever I do?

I am new to the swift language. Can someone tell me how to change the background color of a button using the swift language?

Change button background color using swift language

I have a D3 histogram chart, onto which I have attached an &#39;onclick&#39; event to the bars:

    ...
    var bar = svg.selectAll(&quot;.bar&quot;)
            .data(data)
            .enter().append(&quot;g&quot;)
            .attr(&quot;class&quot;, &quot;bar&quot;)
            .attr(&quot;transform&quot;, function(d) { return &quot;translate(&quot; + x(d.x) + &quot;,&quot; + y(d.y) + &quot;)&quot;; })
            .on(&#39;mouseover&#39;, tip.show)
            .on(&#39;mouseout&#39;, tip.hide)
            .on(&#39;click&#39;, function(d,i){ //do stuff  });
    ...

This works exactly as expected.  I would also like to attach an &#39;onclick&#39; event to the background of the chart (ie. everywhere in the chart that is not a bar), but I am having trouble with this.  I have tried attaching the event in a couple ways, but in every case, this new event seems to override my bar-click:

Some attempts:

    $(&quot;svg:not(&#39;.bar&#39;)&quot;).on(&quot;click&quot;, function(){ //do stuff });

    $(&quot;g:not(&#39;.bar&#39;)&quot;).on(&quot;click&quot;, function(){ //do stuff });

    var svg = d3.select(&quot;#histogram_block&quot;).append(&quot;svg&quot;)
            .attr(&quot;width&quot;, width + margin.left + margin.right)
            .attr(&quot;height&quot;, height + margin.top + margin.bottom)
            .append(&quot;g&quot;)
            .attr(&quot;transform&quot;, &quot;translate(&quot; + margin.left + &quot;,&quot; + margin.top + &quot;)&quot;)
            .on(&quot;click&quot;, function(d,i){
                if (d) { //do stuff}
                else { //do stuff }
            };

I am assuming there is a way to add the event handler to the SVG object when it is initialized, but I don&#39;t know the correct way to go about this.

Attaching &#39;onclick&#39; event to D3 chart background

This is interesting to me. Look at the following D3 code:

	var scale = d3.scale.linear()
		.domain([100, 500])
		.range([10, 350]);
		
	scale(100);  //Returns 10
	scale(300);  //Returns 180
	scale(500);  //Returns 350

Is there a function that inverse of scale? For example,
		
	inverseScale(10);   //Returns 100
	inverseScale(180);  //Returns 300
	inverseScale(350);  //Returns 500


Invert scale function

I like the usage of append in D3, and I&#39;m looking for prepend.

Does this exist in D3?

D3.js prepend (similar to jQuery prepend)

I&#39;m looking into making charts with D3, and stumbled upon the [`d3.bisector`][1]. However, I don&#39;t understand what it is or does from the documentation.

Almost all examples that I find in the web use a Date array, similar to the example in the official documentation:

&lt;!-- language: lang-js --&gt;

    var data = [
      {date: new Date(2011,  1, 1), value: 0.5},
      {date: new Date(2011,  2, 1), value: 0.6},
      {date: new Date(2011,  3, 1), value: 0.7},
      {date: new Date(2011,  4, 1), value: 0.8}
    ];

    var bisect = d3.bisector(function(d) { return d.date; }).right;

So what does the bisector do, besides picking the date object from the array elements? What does the `*.right` return?

And is it of any use if I have a simple 1-dimensional array, like `var data = [3, 6, 2, 7, 5, 4, 8]`?

Thanks for enlightening me.

  [1]: https://github.com/mbostock/d3/wiki/Arrays#d3_bisector

Content Type	Original Author	Original Content on Stackoverflow
Question	jhyap	View Question on Stackoverflow
Solution 1 - Javascript	jhyap	View Answer on Stackoverflow

How to set text color for my d3 chart title?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Rails 4 find or create by method doesn't work

ElasticSearch - Optimal number of Shards per node

Attributions