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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
Following is the syntax to generate random color in JavaScript −$("#yourIdName").css("background-color", yourCustomFunctionNameToGetRandomColor());Following is the JavaScript code −Example Live Demo Document Click the button to get random color //The getColorCode() will give the code every time. function getColorCode() { var makeColorCode = '0123456789ABCDEF'; var code = '#'; for (var count = 0; count < 6; count++) { code =code+ makeColorCode[Math.floor(Math.random() * 16)]; } return code; } //Function ... Read More
At first, you need to extract the extract the div class with the help of getElementsByClassName() and iterate over the for loop and use the OR condition to show the specific text.Also, set yourDiv.style.display=’none’.Following is the JavaScript code −Example Live Demo Document header content footer let attribute = document.getElementsByClassName('block'); for (let i = 0; i < attribute.length; i++) { let impDiv = attribute[i]; let value = impDiv.innerHTML.trim(); if (value == 'header' || value == ... Read More
To upload an image, use FileReader() in JavaScript. Following is the JavaScript code −Example Live Demo Document function readImage(fileInput) { if (fileInput.files && fileInput.files[0]) { var takingInputFile = new FileReader(); takingInputFile.onload = function(event) { $('#chooseImage').attr('src', event.target.result); } takingInputFile.readAsDataURL(fileInput.files[0]); } } $("#yourImage").change(function() { readImage(this); }); To run the above program, save the file name anyName.html(index.html) and right click on the file and select the option Open with live server in VS code editor.Output