Rose Lancy

Rose Lancy

1587624713

How to Run Specified Time in JavaScript

In this article, I will show you how to run a JavaScript code selectively. Sometimes the requirements are like we want to run a specific section of script on a specific day or at a specific time of the day. For example, let’s consider the following situations:

  • If you want to change the background of a website on some special days like Christmas.
  • If you want a different look for your website at a specific time of the day.

In all of the preceding cases, this article will be very useful. So let’s start our discussion by starting with the first example.

The Date Class

The Date object of JavaScript is very important to understand before we code the preceding situations. It is very big and it’s not possible to cover it completely in this article.

We will discuss only those methods of this class that we will use in our script.

  • getDate: Returns the day of the month (1-31) for the specified date depending on local time. It doesn’t take any parameter.
  • getDay: Returns the day of the week (0-6) for the specified date depending on local time. Always remember that count of days starts from 0 in JavaScript.
  • getHours(): Returns the hour (0-23) on the specified date depending on local time. Always remember that the count of hours starts from 0.
  • getMinutes(): Returns the minutes (0-59) on the specified date depending on local time. Always remember that the count of hours starts from 0.
  • getMonth(): Returns the month (0-11) on the specified date depending on local time. Always remember that the count of hours starts from 0. So for December that is 12th month is represented by 11 in JavaScript.
  • getSeconds(): Returns the seconds (0-59) on the specified date depending on local time.

Running script on special days

Use the following procedure to do it:

  1. First, we will detect the current date.
  2. Second, we will compare the current date with our goal day.
  3. Thirdly we will execute the script if the result of the second step is true.

Example

HTML

<!DOCTYPE html>  
<html>  
    <head>  
    <linkhreflinkhref="http://code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.min.css"rel="stylesheet"type="text/css"/>  
    <scriptsrcscriptsrc="http://code.jquery.com/jquery-1.10.2.min.js"></script>  
    <scriptsrcscriptsrc="http://code.jquery.com/ui/1.10.4/jquery-ui.min.js"></script>  
    <metacharsetmetacharset=utf-8/>  
    <title>JS Bin</title>  
    </head>  
    <body>  
      <dividdivid="dlg"title="Congratulations"><p>Happy independence day!</p></div>  
    </body>  
</html> 

CSS

#dlg{  
  font-size:20pt;  
  color:red;  
  display:none;  
} 

jQuery

function test(){  
   var d=new Date();  
   if(d.getDate()==15&& d.getMonth()+1 == 8){//15th Aug  
     // special script  
      $("#dlg").dialog();  
   }else{  
     //rest of the script  
   }  
}  
test(); 

Line number 2 creates an instance of date using the Date constructor. The Date constructor with zero arguments returns the current date of the system.

Line number 3 compares the day off today (using getDate) with 15 and today’s month (using getMonth) with 8 (7+1 for Aug). This line checks whether today is 15th August or not.

If line 3 evaluates to true then a happy independence message will be shown else the rest of the script is executed.

Output

This is image title

The running script at a specific time of the day

Here we will execute our script at a specific time of the day. Let’s say we want to alert the user for “Happy Hours” we can use it.

HTML

<!DOCTYPE html>  
<html>  
<head>  
<linkhref="http://code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.min.css"rel="stylesheet"type="text/css"/>  
<scriptsrc="http://code.jquery.com/jquery-1.10.2.min.js"></script>  
<scriptsrc="http://code.jquery.com/ui/1.10.4/jquery-ui.min.js"></script>  
<metacharset=utf-8/>  
<title>JS Bin</title>  
</head>  
<body>  
  <divid="dlg"title="Congratulations"><p>Free !Sale! period is running!</p></div>  
</body>  
</html> 

jQuery

function test(){  
   var date=new Date();  
   if(date.getDay()==1&& date.getHours()+1 >=8 && date.getMinutes()+1 >=35)  
   { //8-9AM  
      $("#dlg").dialog();  
      clearInterval(iId);  
   }  
   elseif(date.getDay()==1&& date.getHours()+1 == 9 && date.getMinutes()+1 <= 20)  
   {  
         $("#dlg").dialog();  
      clearInterval(iId);  
   }else  
   {  
     //nothing happens  
   }  
} 

Line number 2 creates a current date instance.

Line number 3 checks the time, whether it is between 8:35 AM and 9 AM (using getHours and getMinutes) and today is Monday (using getDay, 1 for Monday).

If line number 3 is true then a happy hour message is shown, else line number 8 is checked.

Line number 6 stops the checking of time as our goal to run the script is met.

Line number 8 checks whether the time is between 9:00 AM and 9:20 AM.

Output

This is image title

This is image title

Summary

That’s all for this article. I hope you have enjoyed reading this article and learned something new from it.

Thank you for reading!

#javascript #programming

What is GEEK

Buddha Community

How to Run Specified Time in JavaScript

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

Get your business app with JavaScript

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Book Free Interview: https://bit.ly/3dDShFg

#hire dedicated javascript developers #hire javascript developers #top javascript developers for hire #hire javascript developer #hire a freelancer for javascript developer #hire the best javascript developers

Niraj Kafle

1589255577

The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Ajay Kapoor

1626321063

JS Development Company India | JavaScript Development Services

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Santosh J

1622036598

JavaScript compound assignment operators

JavaScript is unarguablly one of the most common things you’ll learn when you start programming for the web. Here’s a small post on JavaScript compound assignment operators and how we use them.

The compound assignment operators consist of a binary operator and the simple assignment operator.

The binary operators, work with two operands. For example a+b where + is the operator and the a, b are operands. Simple assignment operator is used to assign values to a variable(s).

It’s quite common to modify values stored in variables. To make this process a little quicker, we use compound assignment operators.

They are:

  • +=
  • -+
  • *=
  • /=

You can also check my video tutorial compound assignment operators.

Let’s consider an example. Suppose price = 5 and we want to add ten more to it.

var price = 5;
price = price + 10;

We added ten to price. Look at the repetitive price variable. We could easily use a compound += to reduce this. We do this instead.

price += 5;

Awesome. Isn’t it? What’s the value of price now? Practice and comment below. If you don’t know how to practice check these lessons.

Lets bring down the price by 5 again and display it.
We use console.log command to display what is stored in the variable. It is very help for debugging.
Debugging let’s you find errors or bugs in your code. More on this later.

price -= 5;
console.log(price);

Lets multiply price and show it.

price *=5;
console.log(price);

and finally we will divide it.

price /=5;
console.log(price);

If you have any doubts, comment below.

#javascript #javascript compound assignment operators #javascript binary operators #javascript simple assignment operator #doers javascript