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To close list items with JavaScript, the code is as follows −Example Live Demo body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } * { box-sizing: border-box; } ul { list-style-type: none; padding: 0; margin: 0; } ul li { border: 1px solid rgb(221, 221, 221); background-color: #5a5cec; color: white; padding: 12px; text-decoration: none; font-size: 18px; ... Read More
To create a chat message with CSS, the code is as follows −Example Live Demo body { margin: 0 auto; max-width: 800px; padding: 0 20px; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } .message { font-size: 18px; font-weight:500; border: 2px solid #dedede; background-color: #55e4a8; color:rgb(0, 0, 0); border-radius: 12px; padding: 10px; margin: 10px 0; } .darker ... Read More
To create a typing effect with JavaScript, the code is as follows −Example Live Demo body{ font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } button{ padding:10px; font-size: 18px; background-color: rgb(128, 19, 218); color:white; border:none; } .heading{ color:crimson; } typeText Click me document.querySelector('.typeButton').addEventListener('click',typeText); var i = 0; var text = 'This text is currently being typed across... It is still typing..'; var speed = 50; function typeText() { if (i < text.length) { document.querySelector('.heading').innerHTML += text.charAt(i); i++; setTimeout(typeText, speed); } } OutputThe above code will produce the following output −On clicking the “Click me” button −
To create a countdown timer with JavaScript, the code is as follows −Example Live Demo body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .timer { text-align: center; font-size: 60px; margin-top: 0px; color: white; background-color: rgb(100, 38, 214); } Countdown Timer Example var countDownDate = new Date("June 5, 2022 11:27:15").getTime(); var timeClear = setInterval(function() { var now = new Date().getTime(); var ... Read More
To use icons to make animated effect, the code is as follows −Example Live Demo #user { font-size: 60px; color:rgb(106, 33, 201); } body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; padding: 20px; } Animating Icon example function userShift() { var userEle; userEle = document.getElementById("user"); userEle.innerHTML = ""; setTimeout(function() { userEle.innerHTML = ""; }, 1000); setTimeout(function() { userEle.innerHTML = ""; }, 2000); } userShift(); setInterval(userShift, 4000); OutputThe above code will produce the following output −
For random value with Map Reduce, use mapReduce() concept along with Math.random(). Let us create a collection with documents −> db.demo651.insertOne({Value:10}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f0330e3c3cd0dcff36a57") } > db.demo651.insertOne({Value:20}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f0332e3c3cd0dcff36a58") } > db.demo651.insertOne({Value:30}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f0335e3c3cd0dcff36a59") } > db.demo651.insertOne({Value:40}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f0337e3c3cd0dcff36a5a") } > db.demo651.insertOne({Value:50}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f0339e3c3cd0dcff36a5b") } > db.demo651.insertOne({Value:60}); { "acknowledged" : true, "insertedId" : ObjectId("5e9f033be3c3cd0dcff36a5c") } > db.demo651.insertOne({Value:70}); { "acknowledged" : true, "insertedId" ... Read More
To query only the field name, set fieldName to 0 i.e. the fieldName to hide. Let us create a collection with documents −> db.demo650.insertOne({_id:101, details:{Name:"Chris", Age:21}}); { "acknowledged" : true, "insertedId" : 101 } > db.demo650.insertOne({_id:102, details:{Name:"Bob", Age:22}}); { "acknowledged" : true, "insertedId" : 102 } > db.demo650.insertOne({_id:103, details:{Name:"Sam", Age:20}}); { "acknowledged" : true, "insertedId" : 103 } > db.demo650.insertOne({_id:104, details:{Name:"Robert", Age:24}}); { "acknowledged" : true, "insertedId" : 104 }Display all documents from a collection with the help of find() method −> db.demo650.find();This will produce the following output −{ "_id" : 101, "details" : { "Name" : "Chris", "Age" : ... Read More
Use MongoDB aggregate for this and within that, use $group. Let us create a collection with documents −> db.demo649.insertOne( ... { "_id" : 101, "Names" : [ "John", "Bob", "Bob", "Robert" ], "CountryName" : "US" } ... ); { "acknowledged" : true, "insertedId" : 101 } > > db.demo649.insertOne({ "_id" :102, "Names" : [ "John", "Robert" ], "CountryName" : "UK"}); { "acknowledged" : true, "insertedId" : 102 }Display all documents from a collection with the help of find() method −> db.demo649.find();This will produce the following output −{ "_id" : 101, "Names" : [ "John", "Bob", "Bob", "Robert" ], "CountryName" ... Read More
To create a new database, you need to use the USE command as in the below syntax −use yourDatabaseName;To show all databases, you need to use show command. The syntax is as follows −show dbs;Let us implement the above syntax in order to create database −> use onlinecustomertracker; switched to db onlinecustomertrackerIn order to display the newly created database, you need to create collection. Following is the query −> db.example.insert({Value:10}); WriteResult({ "nInserted" : 1 })Display all documents from a collection with the help of find() method −> db.example.find();This will produce the following output −{ "_id" : ObjectId("5e9dafade3c3cd0dcff36a4f"), "Value" : 10 ... Read More
For searching value, use $match in MongoDB. Let us create a collection with documents −> db.demo648.insertOne( ... { ... StudentInformation: ... [ ... { ... Name:"John", ... CountryName:"US" ... }, ... { ... Name:"David", ... CountryName:"AUS" ... }, ... { ... Name:"Chris", ... ... Read More