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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is if...else if... statement in JavaScript?
The if...else if... statement is an advanced form of if…else that allows JavaScript to make a correct decision out of several conditions.SyntaxThe syntax of an if-else-if statement is as follows −if (expression 1){ Statement(s) to be executed if expression 1 is true } else if (expression2){ Statement(s) to be executed if expression 2 is true } else if (expression3){ Statement(s) to be executed if expression 3 is true } else{ Statement(s) to be executed if no expression is true }ExampleYou can try to run the following to learn how to work with if…else if statement in ...
Read MoreHTML DOM Parameter Object
The HTML DOM Parameter Object represent the element of an HTML document.Create param objectSyntaxFollowing is the syntax −document.createElement(“PARAM”);Properties of param objectPropertyExplanationnameIt returns and modify the value of the name attribute of a param element in an HTML document.valueIt returns and modify the content of the value attribute of a param element in an HTML document.ExampleLet us see an example of param object − Live Demo html{ height:100%; } body{ text-align:center; color:#fff; background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) center/cover no-repeat; ...
Read MoreHTML DOM Input Date step Property
The HTML DOM Input Date step property determines the legal day intervals to choose from when user opens the calendar. It sets or returns the input date step attribute value.SyntaxFollowing is the syntax −Returning number valueinputDateObject.stepSetting value attribute to a number valueinputDateObject.step = numberExampleLet us see an example of Input Date step property − Live Demo Input Date required Odd Days Calendar: var divDisplay = document.getElementById("divDisplay"); var inputDate = document.getElementById("dateSelect"); divDisplay.textContent = 'Current step: '+inputDate.step; OutputThis will produce the following output. Here, step was set to 2 −
Read MoreWhat are Variable Naming Conventions in JavaScript
While naming your variables in JavaScript, keep some rules in mind. The following are the variable naming conventions in JavaScript −You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid.JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one.JavaScript variable names are case-sensitive. For example, Name and name are two different variables.Here are the Examples −var name; // correct var 2name; ...
Read MoreHow to name variables in JavaScript?
Variables can be thought of as named containers. You can place data into these containers and then refer to the data simply by naming the container.While naming your variables in JavaScript, keep the following rules in mind.You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid.JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one.JavaScript variable names are ...
Read MoreWhat happens when you do not declare a variable in JavaScript?
Yes, this can be done. When you have a global scope, you can use a variable without declaring it. The following “no var” variable “points” will look at the scope chain, wince var keyword isn’t use − var rank = 5; points = 50; marks = 300; // Anonymous function (function() { points = 100; //overwrites global scope points var rank = 4; //new rank variable is created in this' function's scope var marks = 900; document.write(rank+"\r"); //prints 4 document.write(points+"\r"); //prints 100 document.write(marks+"\r"); //prints 900 })(); document.write(''); document.write(''); document.write(rank+"\r"); //prints 5 document.write(points+"\r"); //prints 100 document.write(marks+"\r"); //prints 300
Read MoreVariable Hoisting in JavaScript
When you can use a JavaScript variable before it is declared, it is done using a technique called hoisting. The parser read through the complete function before running it.The behavior in which a variable appears to be used before it is declared is known as hoisting −For example, the following,points =200; var points;The above works the same like the following −var points; ponts = 200;
Read MoreWhat is the "double tilde" (~~) operator in JavaScript?
The “double tilde” (~~) operator is a double NOT Bitwise operator. Use it as a substitute for Math.floor(), since it’s faster.ExampleYou can try to run the following code to learn about double tilde operator − var a = 2; var b,c, d; b = ~~a; c = Math.floor(a); d = ~~b=== c; document.write(b); document.write(""+c); document.write(""+d); // They are equal
Read MoreHTML DOM Input Month step Property
The HTML DOM input month step property returns and modify the value of the step attribute of input month field in an HTML document.SyntaxFollowing is the syntax −1. Returning stepobject.step2. Modifying stepobject.step = “number”ExampleLet us see an example of HTML DOM input month step property − Live Demo html{ height:100%; } body{ text-align:center; color:#fff; background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) center/cover no-repeat; height:100%; } p{ font-weight:700; font-size:1.1rem; } input{ ...
Read MoreHTML DOM Input Month max Property
The HTML DOM input month max property returns and modify the value of the max attribute of the input field of type=”month” in a HTML document.SyntaxFollowing is the syntax −1. Returning maxobject.max2. Modifying maxobject.max = “YYYY-MM”Here, YYYY represent year and MM represent month like “2019-02”ExampleLet us see an example of HTML DOM input month max property − Live Demo html{ height:100%; } body{ text-align:center; color:#fff; background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) center/cover no-repeat; height:100%; } ...
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