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.activeElement) === "undefined"
        ? "" : document.activeElement.id;
}

function focusControl(targetControl) {
    if (Sys.Browser.agent === Sys.Browser.InternetExplorer) {
        var focusTarget = targetControl;
        if (focusTarget && (typeof (focusTarget.contentEditable) !== "undefined")) {
            oldContentEditableSetting = focusTarget.contentEditable;
            focusTarget.contentEditable = false;
        }
        else {
            focusTarget = null;
        }
        targetControl.focus();
        if (focusTarget) {
            focusTarget.contentEditable = oldContentEditableSetting;
        }
    }
    else {
        targetControl.focus();
    }
}

function pageLoadedHandler(sender, args) {
    if (typeof (lastFocusedControlId) !== "undefined" && lastFocusedControlId != "") {
        var newFocused = $get(lastFocusedControlId);
        if (newFocused) {
            focusControl(newFocused);
        }
    }
}

Sys.Application.add_init(appInit);

Step 2: Do the following setting in aspx page

    <asp:ScriptManager ID="c_scriptManager" runat="server">
        <Scripts>
            <asp:ScriptReference Path="~/MyUpdatePanelFocus.js" />
        </Scripts>
    </asp:ScriptManager>

That's it you have done it!!!!

Comments

  1. Thank you soooo much this is the only script i have found that has worked the way i wanted it to and was easy to implement.

    ReplyDelete
  2. GOOd work friend......keep it up.i am seraching thgis type code

    ReplyDelete
  3. Nice work, worked perfectly.

    ReplyDelete
  4. Hi,
    But it's not working in ModlelPopupExtender.
    u people having any solution.


    ReplyDelete
  5. oh nice yaar it is working ......thanks dear

    ReplyDelete
  6. Great Work.. After a long search got a perfect solution.

    ReplyDelete
  7. Really good concept (the most important pat). Great would be to also keep the cursor position for cases when user is in middle of editing.

    ReplyDelete
  8. realy great work!

    ReplyDelete
  9. This comment has been removed by the author.

    ReplyDelete
  10. I have tried this but the issue is that the position of the cursor is not being set to where the user clicked after editing in the previous text area. but if there is no edit to the previous control, the cursor position is maintained and is set to the user's desired location. Could anyone please help on this

    ReplyDelete

Post a Comment

Popular posts from this blog

Disable backspace key using Jquery

Clone a generic list in C# using extension method

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

Add Comma automatically while entering amounts in textbox using Javascript

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

Source Code Beautifier And Format Source Code For Blogger and Websites

Email validation using regular expression in jQuery

Send bulk Email in asp.net using excel file