The key-events happen whenever a user interacts with keyboard. There are mainly three key event types − keydown, keypress and keyup.EventDescriptionOnkeydownThis event fires when the user is pressing a keyOnkeypressThis event fires when the user presses the keyOnkeyupThis event fires when the user releases the key.Following is the code for ... Read More

Following is the code for looping over regular expression matches in javaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result,    .sample {       font-size: 18px;       color: blueviolet; ... Read More

You can use the concept of value(). Following is the JavaScript code −Example Live Demo Document FirstNumber SecondNumber: Add Two Nnumbers The addition is:    function add() {       var f = parseInt(document.getElementsByName('input1')[0].value);`       ... Read More

Following is the code to override derived properties in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result,    .sample {       font-size: 18px;       font-weight: 500;     ... Read More

Use document.getElementById().innerHTML for this. Following is the JavaScript code −Example Document    function display(){       var storedValue = document.getElementById('getValue').innerHTML.value="This is the       value";       console.log("The value is==="+storedValue);    } To run ... Read More

The onchange event triggers when an element changes. You need to use below syntax.onchange="yourFunctionName(this);"Example Live Demo Document Choose Color    function showValue(c){       console.log(c.value);    } To run the above program, save the file ... Read More

Following is the JavaScript code to make a format like ABC-1234 −Example Live Demo Document ABC1234    function joinTheDashSymbol(m, r1, r2, r3, r4, r5) {       if (r1)          return [r1, r2, r3].join('-');       ... Read More

Display in alert by using alert(window()). Following is the syntax −alert(window['yourVariableName' + 'yourVariableName' + otherVariableName]);Example Live Demo Document    var globalVariablelocal_print100=100;    print100=1;    alert(window['globalVariable' + 'local_' + print100]); To run the above program, save the file name anyName.html(index.html) ... Read More

Following is the code for object de-structuring in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .sample, .result {       font-size: 18px;       font-weight: 500;       color: ... Read More

The JavaScript Array.prototype.sort() method is used for sorting an array. The order of sorting can be alphabetic, numeric, ascending or descending.Following is the code for the Array.prototype.sort() method −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;   ... Read More