Javascript keaboard events for function keys f1 to f12

-
Using the function keys in a web application is a dicey situation.  Several of the keys have specific uses in the browser and these keys should be avoided at all costs.  Additionally, the keys all have a semantic meaning in the UI standards of various operating systems.  But if you insist on using function keys, here’s a handy matrix for how they map and what events they can be used from.



Key Windows Semantic Meaning onKeyDown onKeyPress* onKeyUp Notes
F1 Help 112 112 N/A Don’t use this, it will open the browser’s help regardless of the way you process this key.
F2 Undo 113 113 113
F3 Redo 114 114 N/A
F4 New 115 115 115
F5 Open/Refresh N/A N/A 116 Don’t use this… ever.  It always refreshes the browser and this functionality cannot be overridden.
F6 Close 117 117 N/A
F7 Reply 118 118 N/A In Firefox this brings up the dialog to turn off caret browsing.  You should avoid this key.
F8 Forward 119 119 119
F9 Send 120 120 120
F10 Spell 121 121 121
F11 Save/Full Screen 122 122 122 DON’T USE THIS!  This causes the browser to go full screen (just about all browsers have this now).  The semantic meaning of Save should be transferred to F6 which is semantically Close by default.
F12 Print 123 123 123

* IE does not support the onKeyPress event for function keys!

You’ll notice several keys don’t show up in the onKeyUp event.  I have no idea why this behavior exists.

Comments

Post a Comment

Popular posts from this blog

Restore the lost focus of Auto post back controls in asp.net update Panel control

-
Problem: We put  autopostback controls like textbox, DropDownList controls inside in update panel to reducing the flickering of the Page.but when user uses tab for entering the details  the focus of the control losts. Web site users who prefer to use keyboard need to use mouse to activate appropriate input box or press TAB multiple times. Solution: Step 1: Save following in js file give any name to it (like MyUpdatePanelFocus.js ) var lastFocusedControlId = ""; function focusHandler(e) { document.activeElement = e.originalTarget; } function appInit() { if (typeof (window.addEventListener) !== "undefined") { window.addEventListener("focus", focusHandler, true); } Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(pageLoadingHandler); Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pageLoadedHandler); } function pageLoadingHandler(sender, args) { lastFocusedControlId = typeof (document.acti
Read more

Clone a generic list in C# using extension method

-
In practical situation you need to clone of object so that change in cloned object will not affect the original one. If you need a cloned list with the same capacity you need to do some extra stuff with your user type. I came up with this easy solution using ICloneable interface in your custom type class. The first step you need to implement the ICloneable interface in your class like below. public class MyClassDto : ICloneable { public Int64 Id { get; set; } public string Time { get; set; } public int user{ get; set; } public object Clone() { return new MyClassDto{ Date = this.Date, Id = this.Id, user = this.user}; } } after that you need to add extension method in common class so that you can use it everywhere you want. public static class Extensions { public static List<T> Clone<T>(this List<T> listToClone) where T : ICloneable { return listToClone.Select(item
Read more

Add Comma automatically while entering amounts in textbox using Javascript

-
Use following javascript function to add comma in numerics input in textbox function Comma(Num) { Num += ''; Num = Num.replace(/,/g, ''); x = Num.split('.'); x1 = x[0]; x2 = x.length > 1 ? '.' + x[1] : ''; var rgx = /(\d)((\d)(\d{2}?)+)$/; while (rgx.test(x1)) x1 = x1.replace(rgx, '$1' + ',' + '$2'); return x1 + x2; } Use following event of input textbox to call above function onkeyup = "javascript:this.value=Comma(this.value);"
Read more

Disable backspace key using Jquery

-
Disable backspace key in HTML form using Jquery in simple steps. While user enters data into application if user accidentally  press backspace button then it will redirect to previous page and all entered data would be lost. to eliminate this event we can disable the backspace key using Jquery. Following is the JQuery script tag you can add to the web page $(document).keydown(function (e) { var nodeName = e.target.nodeName.toLowerCase(); if (e.which === 8) { if ((nodeName === 'input' && e.target.type === 'text') || nodeName === 'textarea') { // do nothing } else { e.preventDefault(); } } }); The above code can be used seamlessly with any web technology you are using. Hope this will help you in your web application. Happy coding:)
Read more

Step by step migration of ASP.NET Core 2.2 to 3.1

-
In order to upgrade/migrate asp.net core version to 3.1 following steps to be perform. Download and install Visual Studio 2019 version 16.4 or higher. Download and install .NET Core 3.1  https://dotnet.microsoft.com/download/dotnet-core/3.1 Upgrade the projects of solution to .NET Core 3.1 , because ASP.NET Core 3.1 requires it. Update existing Nuget packages to a version compatible with ASP.NET Core 3.1 in each project Use IHost interface from a IHostBuilder instead of building and running a IWebHost from a IWebHostBuilder in Program.cs public static IHostBuilder CreateWebHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseKestrel() .UseSerilog() .UseStartup<Startup>(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects. In Startup.cs, UseMvc method to b
Read more

How to Import CSV File and bind csv file data to gridview in asp.net using c#

-
I am going to demonstrate in this article about importing CSV file data into datatable and then bind that data to Asp.net gridview control. i have tried to make code simpler and less line of code. I am assuming that you have saved the csv file to server by using fileupload control. After that create function which returns string[] private IEnumerable<string[]> GetAllDataFromCSVFile(string FileName) { string str; using (StreamReader rd=new StreamReader(FileName)) { while ((str = rd.ReadLine()) != null) { yield return str.Split(','); } } } Create another function which returns final data-table with CSV File data private DataTable GetCSVData(string FileName) { var values = GetAllDataFromCSVFile(FileName); DataTable dt = new DataTable(); int j=0; foreach (var i
Read more

Source Code Beautifier And Format Source Code For Blogger and Websites

-
Source Code Beautifier And Formatter For Blogger and Websites, Format Source Code , Format Source code for blog or blogging & website, Online line source code formatter tool, blogger code format tool, Format source code for blog-spot,Insert formatted source code How to format source code for blogger & website :   You can format your source code for blogger & website in easy three steps.. 1) Paste your source code into "Paste Here Your Source Code" Text-area. 2) Choose appropriate options from "formatting options" and click Format Source Code button.. 3) See preview of formatted source code if it's fine then copy from "Copy Formatted Source Code" text-area otherwise repeat step 2  This source code formatter allow you to format code like JavaScript, HTML, CSS, C#, PHP, ASP.net, VB.Net, Visual Basic, DOT.net, ASP & many other languages.  It does not add unnecessary tags into formatted code, It use only two t
Read more

Remove Owin from MVC 5 Application and use asp.net custom forms authentication

-
Image
Owin comes with 15 other dependencies when we add default "blank" mvc5 template in solution. Which some time is irrelevant to web application hence needs to be removed for adding custom authentication techniques in the web application. Remove the owin  from solution is tedious task but if we follow the below procedure then it can be easily removed from the solution. Right click on your project and from menu click on Manage Nuget Packages. on left side of Manage Nuget Packages window click on Installed Package then on right side of window in search box type owin.  Uninstall packages in order of: microsoft.aspnet.identity.owin microsoft.owin.host.systemweb microsoft.owin.security.cookies microsoft.owin.security.facebook microsoft.owin.security.google microsoft.owin.security.microsoftaccount microsoft.owin.security.twitter microsoft.aspnet.identity.entityframework microsoft.aspnet.identity.core Open web.config file and remove these sections from   &l
Read more

All about the IEnumerable VS IQueryable in c#

-
In Linq or entity framework, we use IEnumerable and IQueryable for data manipulation or query data. IEnumerable is inherited by IQueryable , Hence IQueryable has all the features of IEnumerable and except this, it has its own features and benefits. Both have its own importance to query data and data manipulation in different situations in the application. we can go through with both the features and take the advantage of both the features to boost the LINQ Query performance. As per the need of application at some stage  IEnumerable is useful and some stage in the application  IQueryable is useful. Lets discuss about its use and features now. IEnumerable Features: IEnumerable exists in System.Collections Namespace. IEnumerable can move forward only over a collection, it can’t move backward and between the items. IEnumerable is best to query data from in-memory collections like List, Array etc. While query data from database, IEnumerable execute select query on server side,
Read more