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Anyone who starts with a new language has to hassle a lot to learn various modules before working on real industry-specific projects. As we are familiar with a general convention of starting out with our “hello world” programs, there are few programs which we can practice for learning the basics of any language. If you ever tried learning systematically, there is no doubt that you haven’t encountered “building a calculator” phase. So, today we are going to build a basic calculator using JavaScript. The various topics covered here are:
To ease out the process, it is very important that we keep our compilers ready to test things while we are reading the entire post here. Let’s hop in!
JavaScript, better known as the “scripting language” of web pages, can do wonders. A calculator, as we know, will perform our basic operations viz. Addition, Subtraction, Multiplication, and division. For starting out, you should be familiar with HTML and CSS. The section with JavaScript code, we’ll take care of that.
If you’re new to website development, you should know that one needs a local server to test out codes before deployment. You can go for wamp, xampp or any other server. For writing your codes, there are so many options: Sublime Text 3, NetBeans, Brackets, etc. Once you’re through with setting up platforms, rest of the work is a cakewalk.
To link various files, you can use the following:
In our JavaScript calculator, we’ll be using Internal CSS. First, we need to figure out how many buttons we are going to need. For now, we stick to the minimum viable functionalities for our basic calculator. So, the list of elements are mentioned below:
To visualize the calculator, it is better if we consider forming a table. A table is nothing, but rows and columns. The visible parts go into the body section facilitated by CSS. The part which is not visible, is the JavaScript, that goes into <style> section.
This section will include the display, solve and clear functions.
<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-wp-preserve="%3Cscript%3E%0A%2F%2Ffunction%20for%20displaying%20values%0Afunction%20dis(val)%0A%7B%0Adocument.getElementById(%22edu%22).value%2B%3Dval%0A%26nbsp%3B%7D%0A%2F%2Ffunction%20for%20evaluation%0Afunction%20solve()%0A%7B%0Alet%20x%20%3D%20document.getElementById(%22edu%22).value%0Alet%20y%20%3D%20eval(x)%0Adocument.getElementById(%22edu%22).value%20%3D%20y%0A%7D%0A%2F%2Ffunction%20for%20clearing%20the%20display%0Afunction%20clr()%0A%7B%0Adocument.getElementById(%22edu%22).value%20%3D%20%22%22%0A%7D%0A%3C%2Fscript%3E" data-mce-resize="false" data-mce-placeholder="1" class="mce-object" width="20" height="20" alt="<script>" title="<script>" />
<!-- create table --> <body> <div class = title >Edureka JavaScript Calculator</div> <table border="1"> <tr> <td><input type="button" value="c" onclick="clr()"/> </td> <td colspan="3"><input type="text" id="edu"/></td> <!-- clr() function will call clr to clear all value --> </tr> <tr> <!-- creating buttons and assigning values--> <td><input type="button" value="+" onclick="dis('+')"/> </td> <td><input type="button" value="1" onclick="dis('1')"/> </td> <td><input type="button" value="2" onclick="dis('2')"/> </td> <td><input type="button" value="3" onclick="dis('3')"/> </td> </tr> <tr> <td><input type="button" value="-" onclick="dis('-')"/> </td> <td><input type="button" value="4" onclick="dis('4')"/> </td> <td><input type="button" value="5" onclick="dis('5')"/> </td> <td><input type="button" value="6" onclick="dis('6')"/> </td> </tr> <tr> <td><input type="button" value="*" onclick="dis('*')"/> </td> <td><input type="button" value="7" onclick="dis('7')"/> </td> <td><input type="button" value="8" onclick="dis('8')"/> </td> <td><input type="button" value="9" onclick="dis('9')"/> </td> </tr> <tr> <td><input type="button" value="/" onclick="dis('/')"/> </td> <td><input type="button" value="." onclick="dis('.')"/> </td> <td><input type="button" value="0" onclick="dis('0')"/> </td> <!-- Evaluating function call eval()--> <td><input type="button" value="=" onclick="solve()"/> </td> </tr> </table> </body>
<!-- for styling --> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-wp-preserve="%3Cstyle%3E%0A.title%7B%0Aborder-radius%3A%2010px%3B%0Amargin-bottom%3A%2010px%3B%0Atext-align%3Acenter%3B%0Awidth%3A%20210px%3B%0Acolor%3A%23ff4456%3B%0Aborder%3A%20solid%20black%201px%3B%0A%7D%0Ainput%5Btype%3D%22button%22%5D%0A%7B%0Aborder-radius%3A%2010px%3B%0Abackground-color%3A%23ff4456%3B%0Acolor%3A%20black%3B%0Aborder-color%3A%23ff4456%20%3B%0Awidth%3A100%25%3B%0A%7D%0Ainput%5Btype%3D%22text%22%5D%0A%7B%0Aborder-radius%3A%2010px%3B%0Atext-align%3A%20right%3B%0Abackground-color%3Awhite%3B%0Aborder-color%3A%20black%20%3B%0Awidth%3A100%25%0A%7D%0A%3C%2Fstyle%3E" data-mce-resize="false" data-mce-placeholder="1" class="mce-object" width="20" height="20" alt="<style>" title="<style>" />
Now that we have the sections intact, let’s place them and see the result:
Output Screen:
With this, we have come to the end of our article. I hope you understood the easiest way to build a JavaScript calculator. If you’re just beginning, then watch at this JavaScript Tutorial to Understand the Fundamental Java Concepts.
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