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Javascript Articles
Page 274 of 534
With JavaScript Regular Expression find a non-whitespace character.
To find a non-whitespace character in JavaScript regular expressions, use the \S metacharacter. This matches any character that is not a space, tab, newline, or other whitespace character. Syntax \S // Matches any non-whitespace character \S+ // Matches one or more non-whitespace characters \S* // Matches zero or more non-whitespace characters Example: Finding Non-Whitespace Characters JavaScript Regular Expression ...
Read MoreWith JavaScript RegExp search a carriage return character.
To find carriage return characters with JavaScript Regular Expression, use the \r metacharacter. This pattern matches the carriage return character (ASCII code 13) in strings. Syntax /\r/ Example: Finding Carriage Return Position The following example shows how to search for a carriage return character and return its position in the string: JavaScript Regular Expression ...
Read MoreWhat is availHeight property in JavaScript?
The screen.availHeight property returns the available height of the user's screen in pixels, excluding areas occupied by the taskbar, dock, or other system interfaces. Syntax screen.availHeight Return Value Returns a number representing the available screen height in pixels, excluding system UI elements like taskbars. Example Here's how to use the screen.availHeight property to get the available screen height: Screen Available Height ...
Read MoreMatch any string containing a sequence of two to three p's.
To match any string containing a sequence of two to three p's with JavaScript RegExp, use the p{2, 3} quantifier. This pattern matches exactly 2 or 3 consecutive occurrences of the letter "p". Syntax /p{2, 3}/flags Where {2, 3} specifies the minimum (2) and maximum (3) number of consecutive p's to match. Example: Matching 2-3 Consecutive p's JavaScript Regular Expression var str = "apple pepper hippopotamus p programming"; ...
Read MoreMatch any single character outside the given set.
To match any single character outside the given set with JavaScript RegExp, use the [^...] metacharacter. The caret ^ inside square brackets creates a negated character class that matches any character NOT in the specified set. Syntax /[^characters]/flags Where characters are the characters you want to exclude from matching. Example: Matching Characters Outside a Set JavaScript Regular Expression var myStr = "Welcome!"; var ...
Read MoreHow to return a number indicating the Unicode value of the character?
The charCodeAt() method returns a number indicating the Unicode value of the character at the given index. Unicode code points range from 0 to 1, 114, 111. The first 128 Unicode code points are a direct match of the ASCII character encoding. Syntax string.charCodeAt(index) Parameters index − An integer between 0 and 1 less than the length of the string; if unspecified, defaults to 0. Return Value Returns a number representing the Unicode code point of the character at the specified index. If the index is ...
Read MoreWhat will happen if a semicolon is misplaced in JavaScript?
If a semicolon is misplaced in JavaScript, it can lead to unexpected behavior due to Automatic Semicolon Insertion (ASI). JavaScript automatically inserts semicolons at the end of statements, which can sometimes cause logical errors when semicolons are placed incorrectly. Common Semicolon Misplacement Issues The most common problem occurs when a semicolon is accidentally placed after control flow statements like if, for, or while. Example: Semicolon After if Statement var val1 = 10; ...
Read MoreHow to return a random number between 0 and 199 with JavaScript?
To return a random number between 0 and 199, use the JavaScript Math.random() and Math.floor() methods together. How It Works Math.random() generates a random decimal between 0 (inclusive) and 1 (exclusive). To get integers from 0 to 199: Multiply by 200 to get range 0 to 199.999... Use Math.floor() to round down to nearest integer Example // Generate random number between 0-199 let randomNum = Math.floor(Math.random() * ...
Read MoreWhat is the usage of onpageshow event in JavaScript?
The onpageshow event triggers in JavaScript when a user navigates to a web page, including when the page loads for the first time or when returning from the browser's back/forward cache (bfcache). Syntax // HTML attribute // Event listener window.addEventListener('pageshow', function(event) { // Handle page show }); Example: Basic Usage Here's how to implement the onpageshow event using HTML attribute: On first visit, a welcome message is visible. ...
Read MoreWhat is the usage of onpagehide event in JavaScript?
The onpagehide event triggers in JavaScript when a user leaves the page and navigates away. This occurs during page refresh, clicking links, closing the browser tab, or navigating to another page. Syntax // HTML attribute // JavaScript event listener window.addEventListener('pagehide', function(event) { // Code to execute }); Example: Basic Usage Here's how to implement the onpagehide event using an HTML attribute: Navigate away from this page to see the alert! ...
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