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The dashboard might even come with a video. Check out these two usual suspects that may be seen on typical dashboards:. Gauges are one of the visuals used when it comes to data visualization and dashboards. When you think of a dashboard, this is one of the first visuals that come into your mind. Gauges are basically utilized to display actual vs. Performance targets. In contrast with gauges, sparklines happen to be mostly preferred by data visualization professionals.

Sparklines are basically small line charts and are used in displaying trends over time. Sparklines have certain features which make them highly desired by the experts. One of the reasons is that they are very good at saving space. Another reason is that they can be used to tell a story which gives the viewer a context that is very useful. They are data-intense, small sized graphics that come in a simple design. If you are looking to show data over a period of time, a sparkline can be a perfect visual.

You might wonder why sparklines come in handy for designing dashboards. The reason is that this visualization element has the ability to save both space and time. A lot of data can be packed into such small space with the addition of vital contextual info. They, therefore, provide a quick understanding of events at just a simple glance. This makes it easier to identify issues to be addressed as well as actions to be implemented. Just how does a great dashboard design idea get realized in your web application?

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That is where a program or data visualization expert comes in to take your functional requirements and needs and translate them using a charting library or dashboard framework. They will be sure to consider a responsive design so your dashboard looks as good on mobile devices and phones as it does on desktops, laptops, and tablets.

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They can select javascript chart tools using SVG or scalable vector graphics with HTML5 to ensure the charts on your dashboards are crisp and clear even when zooming or printing. Data will be loaded from your databases and other sources and passes to your dashboard page through JSON JavaScript Object Notation which is a lightweight data-interchange format. Whatever the technical tools used, the end result must be a dashboard that works for you and your customers that will help convey key metrics about your business quickly and efficiently.

With an efficient modular design, you will be able to update and customize your dashboard as your business and needs grow so it can be an asset for years to come.

JavaScript Dashboards, Gauges, and Sparklines Demystified

Your email address will not be published. This Website uses cookies to improve your experience. Please visit the Cookies Policy page for more information about cookies and how we use them. Saltar al contenido. The Javascript runtime maintains a stack of these execution contexts and the execution context present at the top of this stack is currently being executed. The object that this variable refers to changes every time when the execution context is changed. By default, the execution context is global which means that if a code is being executed as part of a simple function call then the this variable will refer to the global object.

In the case of a browser, the global object is the window object.

In a Node. For example, try the following simple function call:. By calling foo , we will get this output:. This proves that this here refers to the global object, which is the window object in our case. Note that, if strict mode is enabled for any function then the value of this will be undefined because in strict mode global object refers to undefined in place of the window object.

Our output, in this case, will be:. If we try that in our console, we should get the following output:. What happened here?

When we call new on Person , JavaScript will create a new object inside the Person function and save it as this. I used this awesome JavaScript visualizer tool from Tyler McGinnis to see how this actually looks like behind the scenes.


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This is what I got:. This tool animates the steps happening behind the scenes in an interesting way that will help you understand how the this object is created and filled. We have now discussed two common cases related to the this keyword binding. Imagine that we have this function:. Indeed, we get this in as our output:.

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Now, we have a simpleFunction property referring to our simpleFunction function. We have also added another property as a method called anotherFunction. If we call user. Why did that happen? Because simpleFunction is now a property of the user object, then the this keyword will refer to the user object and not the global object in this case. Our this keyword will refer to the user object. So, console. What will happen if we do something like the following?

If you try this, you should get this output:.

JavaScript Closures Demystified — SitePoint

But why did this happen? In this case, we do a simple function call. As we already know by now, if a method is invoked as a simple function, then the this keyword will refer to the global object which is in our case equals to the window object, and hence console. What will happen now if we call john. We should get something similar to this:. But inside innerFunction function, this this refers to the global object which in this case is the window object.

Some people see that as a bug in JS, but the rule says that whenever we do a regular function call, then this will refer to the global object. What I learned also is that a function in JavaScript is also a special type of object.

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Every function has a call , bind and apply methods. These methods can be used to set a custom value of this to the execution context of the function. What we are doing here is setting the value of this to be person2 object. So, this should print:. The same also will happen if we use apply :.