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Javascript Articles
Page 471 of 534
Bootstrap Form select
A select is used when you want to allow the user to pick from multiple options, but by default, it only allows one.Use for list options with which the user is familiar, such as states or numbers.Use multiple = "multiple" to allow the users to select more than one option.ExampleYou can try to run the following code to implement Bootstrap form selectLive Demo Bootstrap Example Country India Australia US
Read MoreSet heights and widths of forms with Bootstrap
Use classes like .input-lg and .col-lg-* to set the height and width of forms.ExampleYou can try to run the following code to set the form height and width −Live Demo Bootstrap Example .input-lg Default select .input-sm
Read MoreHow to use window.location to redirect to a different URL with JavaScript?
You might have encountered a situation where you clicked a URL to reach a page X but internally you were directed to another page Y. It happens due to page redirection.It is quite simple to do a page redirect using JavaScript on the client side. To redirect your site visitors to a new page, you just need to add a line in your head section as follows −ExampleYou can try to run the following code to learn how to use window.location to redirect to another URL. Here, we will redirect to the home pageLive Demo ...
Read MoreWhy doesn't JavaScript have a goto statement?
JavaScript has a goto statement, which is a reserved keyword. It isn’t popular since it is not needed in JavaScript. Generally, it isn’t considered a good practice to use a goto statement.Using goto with JavaScript preprocessing is still considered good as shown below −var a = 0; [lbl] beginning: console.log("Demo Text!"); a++; if(i < 424) goto beginning;The above code gets translated like the following −var a = 0; beginning: while(true) { console.log("Demo Text!"); a++; if(i < 424) continue beginning; break; }
Read MoreHow to use labels to control the Flow in JavaScript?
To control the flow in JavaScript, use labels. A label can be used with break and continue statement to control the flow more precisely. A label is simply an identifier followed by a colon (:) that is applied to a statement or a block of code. We will see two different examples to understand how to use labels with break and continue.ExampleYou can try to run the following code to use labels to control the flow, with break statement −Live Demo ...
Read MoreWhat is the best way to break from nested loops in JavaScript?
The best way to break from nested loops is to use labels. A label can be used with break and continue to control the flow more precisely. A label is simply an identifier followed by a colon (:) that is applied to a statement or a block of code.ExampleYou can try to run the following code to implement Label with a break statement to break from nested loops −Live Demo document.write("Entering the loop! "); outerloop: // This is the label name for (var ...
Read MoreBootstrap Contextual classes
The Bootstrap Contextual Class allows you to change the background color of your table rows or individual cells.The following are the classes −ClassDescription.activeApplies the hover color to a particular row or cell.successIndicates a successful or positive action.warningIndicates a warning that might need attention.dangerIndicates a dangerous or potentially negative actionExampleThe following is an example of the active class −ExampleLive Demo Bootstrap Table Subject Marks Student Maths 90 Amit Science 80 Aman English 85 Rahul
Read MoreHow to parse JSON object in JavaScript?
ExampleTo parse JSON object in JavaScript, implement the following code − myData = JSON.parse('{"event1":{"title":"Employment period","start":"12\/29\/2011 10:20 ","end":"12\/15\/2013 00:00 "},"event2":{"title":"Employment period","start":"12\/14\/2011 10:20 ","end":"12\/18\/2013 00:00 "}}') myArray = [] for(var e in myData){ var dataCopy = myData[e] for(key in dataCopy){ if(key == "start" || key == "end"){ dataCopy[key] = new Date(dataCopy[key]) } } myArray.push(dataCopy) } document.write(JSON.stringify(myArray));
Read MoreHow can I pass a parameter to a setTimeout() callback?
To pass a parameter to setTimeout() callback, use the following syntax −setTimeout(functionname, milliseconds, arg1, arg2, arg3...)The following are the parameters −function name − The function name for the function to be executed.milliseconds − The number of milliseconds.arg1, arg2, arg3 − These are the arguments passed to the function.ExampleYou can try to run the following code to pass a parameter to a setTimeout() callbackLive Demo Submit function timeFunction() { setTimeout(function(){ alert("After 5 seconds!"); }, 5000); } Click the above button and wait for 5 seconds.
Read MoreWhat is the syntax for leading bang! in JavaScript function?
To execute an anonymous function you need to use the leading bang! or any other symbol −!function(){ // do stuff }();You can also write it like −+function(){ // do stuff }();Even the following is an acceptable syntax −~function(){ // do stuff return 0; }( );
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