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Following is the code for creating a JavaScript constructor using the ‘new’ operator −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 20px; font-weight: 500; } JavaScript constructor using new CLICK HERE Click on the above button to create JavaScript constructor using new operator let resEle = document.querySelector(".result"); function Human(firstName, lastName, age){ this.firstName = firstName; this.lastName = lastName; this.age ... Read More
Following is the code to add a property, method to a JavaScript constructor −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 20px; font-weight: 500; } Add property, method to javaScript constructor CLICK HERE Click on the above button to add property, method to constructor let resEle = document.querySelector(".result"); function Human(firstName, lastName){ this.firstName = firstName; this.lastName = lastName; } ... Read More
To stop a function during its execution, use the concept of −document.getElementById().addEventListener().Example Live Demo Document Call the function Stop the function execution document.getElementById("call").addEventListener("click", callFunction); document.getElementById("halt").addEventListener("click", haltFunction); var timeValue = null; function callFunction() { timeValue = setInterval(function() { console.log("The call() is being executed...."); }, 1000); } function haltFunction() { clearInterval(timeValue); } To run the above program, save the file name anyName.html(index.html) and right click on the file and select ... Read More
Following is the code to add, access and delete JavaScript object properties −Example Live Demo
Range Underflow − If the element value is less than that of the specified in min attribute, it sets to true.Range Overflow − If the element value is more than that of the specified in max attribute, it sets to true.Following is the code for Range overflow and range underflow property in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 20px; font-weight: 500; } Range Overflow and Range Underflow property ... Read More
The JSON parse() method is used for converting a JSON text to a JavaScript object.Following is the code for converting JSON text to JavaScript JSON object −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JSON parse() Method {"name":"Rohan", "sports":["Cricket", "Football"], "country":"India"} CLICK HERE Click on the above button to parse the above JSON string let ... Read More
For this, use the concept of document.getElementById() along with addEventListener(). Following is the JavaScript code −Example Live Demo Document Enter the value: document.getElementById('enterValue').addEventListener("input", function () { console.log('you have entered the value'); }); To run the above program, save the file nameanyName.html(index.html) and right click on the file and select the option open with live server in VS code editor.OutputWhen user enters a value −
Following is the code to create a JSON object in JavaScript.Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 20px; font-weight: 500; } JSON object in JavaScript JSON OBJECT CLICK HERE Click on the above button to create a JSON object and display it let resEle = document.querySelector(".result"); let obj = { firstName:'Rohan', lastName: 'Sharma', Age:14, } document.querySelector(".Btn").addEventListener("click", () => { for(i in obj){ resEle.innerHTML += 'key = '+i+' value = ' + obj[i] + ''; } }); OutputThe above code will produce the following output −On clicking the ‘CLICK HERE’ button −
You can use # to get the value when user clicks the button using document.querySelector(“”); Following is the JavaScript code −Example Live Demo Document Example: choose a number between 1 to 100 Give a number: Click Me function example() { let btn = document.querySelector("#choose"); let randomNumber = Math.ceil(Math.random() * 100); btn.onclick = function() { let givenNumber = document.querySelector("#inputNumber").value; let valueInt = parseInt(givenNumber, 100); ... Read More
To create a const array in JavaScript we need to write const before the array name. The individual array elements can be reassigned but not the whole array.Following is the code to create a constant array in JavaScript.Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result, .sample { font-size: 20px; font-weight: 500; } Const array in JavaScript CLICK HERE Click on the above button to change array values and reassign the ... Read More