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Javascript Articles
Page 186 of 534
How to calculate minutes between two dates in JavaScript?
In this article, you will understand how to calculate minutes between two dates in JavaScript. The Date object works with dates and times. Date objects are created with new Date(). JavaScript will use the browser's time zone and display a date as a full text string. Example 1 In this example, we use a function to find the time difference. function minutesDiff(dateTimeValue2, dateTimeValue1) { var differenceValue =(dateTimeValue2.getTime() - dateTimeValue1.getTime()) / 1000; differenceValue /= 60; return Math.abs(Math.round(differenceValue)); } dateTimeValue1 = new Date(2020, 12, 12); console.log("The first date time value is defined ...
Read MoreHow to add an element to a JSON object using JavaScript?
In this article, you will understand how to add an element to a JSON object using JavaScript. JSON object literals are keys and values are separated by a colon surrounded by curly braces {}. Example 1 In this example, we add an element to a json object using bracket notation, var jsonObject = { members: { host: "hostName", viewers: { userName1: "userData1", ...
Read MoreHow to use array that include and check an object against a property of an object?
The task is to check whether the array contains a particular value. Also, we need to check if the array contains the particular object with the given property. This tutorial will use the array.includes(), and array.some() method to check whether the array contains the value or object with a particular property. Use the array.includes() method to check values exist in the array The array.includes() method allows us to check whether the array contains any value. In simple terms, we can search for values in the array using the array.includes() method. Syntax Users can follow the syntax below to use the ...
Read MoreHow to access object properties from result returned by async() function in JavaScript?
In this article, you will understand how to access object properties from result returned by async() functions in JavaScript. An object property in JavaScript is a variable that is associated with the object itself, i.e. the properties have a name and value is one of the attributes linked with the property. Example 1 In this example, let’s understand how to access objects property using dot notation console.log("A function is created that returns promise object") const promiseFunction = (input) => { return new Promise((resolve, reject) => { return resolve({ ...
Read MoreHow to calculate days left until next Christmas using JavaScript?
In this article, you will understand how to calculate days left until next Christmas using JavaScript. The Date object works with dates and times. Date objects are created with new Date(). JavaScript will use the browser's time zone and display a date as a full text string. Example 1 In this example, we compute the time difference without functions. let todayDate = new Date(); console.log("Today's date is defined as: ", todayDate) let christmasYear = todayDate.getFullYear(); if (todayDate.getMonth() == 11 && todayDate.getDate() > 25) { christmasYear = christmasYear + 1; } let christmasDate = new Date(christmasYear, 11, ...
Read MoreHow to Create Query Parameters in JavaScript?
Now, the question is why we need to create a query parameter using JavaScript. Let’s understand it via real-life examples. For example, if you go on amazon’s website and search for any product, you will see that it automatically appends your search query to the URL. It means we require to generate the query params from the search query. Also, we can allow users to select any value from the dropdown option. We can generate query parameters and redirect users to a new URL based on the selected value to get results. We will learn to create a query parameter ...
Read MoreHow to create a hash from a string in JavaScript?
Before we start, let’s understand the hash in JavaScript. The hash is also a string, but it's encrypted using a particular algorithm. Generally, we use the hash for security purposes. For example, Google stores users' emails and passwords in their database. Now, Google’s employees can access their database for development purposes. But can they get the user’s email and password from the database? No, because the password is stored in the hash form, and to decrypt the password, the employee needs the key which we used while creating the hash from the password string. So, in such a way, we ...
Read MoreHow to add a property to a JavaScript object using a variable as the name?
In this article, you will understand how to add a property to a JavaScript object using a variable as the name. Adding property to an object can be achieved by two methods. The first is the dot (.) notation and the second is using the brackets([]). Example 1 In this example, let’s use the dot (.) notation. var inputObject = {a: "value1"}; console.log("An object is created with properties: ", inputObject) inputObject.b = "value2"; console.log("After adding properties, the object now contains: ", inputObject) console.log(inputObject) Explanation Step 1 − Define an object namely inputObject. Step 2 − Add an ...
Read MoreHow to create a dynamic length array with numbers and sum the numbers using JavaScript?
In JavaScript, arrays are always dynamic in length. Like other programming languages, we don’t need to define the array's length while creating the array. So, we can create an array and push whatever number of elements we want in the JavaScript array. Here, we will create the dynamic length of the array and add numbers to that. After that, we will sum up all numbers. This tutorial will teach us to create a dynamic length array with numbers and sum the numbers using JavaScript. Use the for loop to sum all elements of the dynamic array We can iterate over ...
Read MoreHow to create a dropdown list using JavaScript?
We will learn to create a dropdown list using HTML and JavaScript below. Before starting with the article, let’s understand the dropdown list and why we need to use it. The dropdown list gives multiple choices to users and allows them to select one value from all options. However, we can do the same thing using multiple radio buttons, but what if we have hundreds of choices? Then we can use the dropdown menu. When users click the dropdown button, it opens all the choices, and users can select anyone. Also, the dropdown provides a better user experience than the ...
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