To add an HTML button as a link to other HTML, we can use the button inside HTML form or style an anchor link as a button or use button onClick event.Add an HTML button as a link using the form tag Add an HTML button as a link
Read MoreTo check if a string is empty or null or undefined in Javascript use the following js code snippet. var emptyString; if(!emptyString){ // String is empty } In JavaScript, if the string is empty or null or undefined IF condition returns false. var undefinedString; if(!undefinedString){ console.log("string is undefined"); }var emptyString=""; if(!emptyString){ console.log("string is empty"); }var nullString=null; if(!nullString){ console.log("string is null"); } If
Read MoreIn SQL server, To write if then else in SQL select query we can useSELECT CASE statement (In all versions of SQL server) SELECT IIF logical function (From SQL server 2012 )We will take an example Employee table which has columns EmpId, EmpName, Experience, Salary, Gender. Now we want
Read MoreTo create GUID or UUID in JavaScript we can use the following methodsJavascript Math.Random() ES6 crypto API getRandomValues method.GUID or UUID generated by Math.Random() may not be unique.According to the RFC4122 version 4 complaint. A GUID or UUID should be in below format xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx Where the allowed values of
Read MoreUsually, we will return JSON data from server APIs (through AJAX). Sometimes the API might return an empty object i.e., "{}".In javascript, we can check if an object is empty or not by usingJSON.stringify Object.keys (ECMA 5+) Object.entries (ECMA 7+)And if you are using any third party libraries like
Read MoreJavascript replace() method replaces only the first occurrence of the stringTo replace all occurrences of a string in Javascript, use the below methodsJavascript string replace method with regular expression Javascript split and join method Javascript indexOf methodTake a look at the below example of Javascript Replace() method var stringtoreplace="js"; var targetstring="vanilla
Read MoreTo check if a Javascript String Contains a substring or not, we can use 7 different Javascript methods as listed in below table.To check for case-insensitive Javascript string contains or Javascript string contains after some index, go through the complete tutorial.Javascript string contains substring check using includes method (in
Read MoreIn Oracle, to rename a column in a table, use ALTER TABLE RENAME COLUMN statement.Oracle Rename Column table syntax Oracle Rename Column in a table query example Oracle Rename table syntax Oracle Rename table query exampleOracle Rename Column table syntax:To rename a column in oracle we have to
Read MoreTo Delete columns in Oracle, we have to use ALTER TABLE...DROP COLUMN statement query.Dropping columns in oracle can be done in 2 ways.Delete Columns Logically or make them unused columns Delete columns with data or physically deleting the columnsDelete columns in oracle table logicallyDelete a single column
Read MoreWe can use user-select property in CSS to disable text selection highlighting in HTML pages.It is not a standard feature, but available in all modern browsers except IE 9 & before.Disable text selection highlighting in HTML using CSS user-select:none Disable text selection highlighting in Chrome using CSS Disable text selection highlighting in
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