R – go back to the first form in windows mobile application

formswindows-mobile

i am developing an application in which i have a logout option at all the forms. When i click that button I have to return to login form which is the first form to be displayed . So i am able to track back to the first from by making a new object of this from by the way this idea is bad to implement because the other froms are also in the stack. My question is how will i go to that first form while the other form objects are distroyed.

The whole idea is about login-logout functionality in winMo app. If somebody can help me with some part of code it will be very great.

Regards,
Madhup

Best Answer

The easiest way is to pass a reference to the Log-in form to all other forms. Avoid creating and destroying forms. Since you know you are going to reuse them, create them only once and then show or hide them.

In log-in form:

if (isLoginSuccessfull) {
   newForm.SetParentForm(this);
   newForm.Show();
   // Do not call Close();
}

In secondary-forms:

public void SetParentForm(Form parent) {
  this.parent = parent;
}

// When you need to close the form:
parent.Show();

Related Solutions

Html – How to overcome the HTML form nesting limitation

I know this is an old question, but HTML5 offers a couple new options.

The first is to separate the form from the toolbar in the markup, add another form for the delete action, and associate the buttons in the toolbar with their respective forms using the form attribute.

<form id="saveForm" action="/post/dispatch/save" method="post">
    <input type="text" name="foo" /> <!-- several of those here -->  
</form>
<form id="deleteForm" action="/post/dispatch/delete" method="post">
    <input type="hidden" value="some_id" />
</form>
<div id="toolbar">
    <input type="submit" name="save" value="Save" form="saveForm" />
    <input type="submit" name="delete" value="Delete" form="deleteForm" />
    <a href="/home/index">Cancel</a>
</div>

This option is quite flexible, but the original post also mentioned that it may be necessary to perform different actions with a single form. HTML5 comes to the rescue, again. You can use the formaction attribute on submit buttons, so different buttons in the same form can submit to different URLs. This example just adds a clone method to the toolbar outside the form, but it would work the same nested in the form.

<div id="toolbar">
    <input type="submit" name="clone" value="Clone" form="saveForm"
           formaction="/post/dispatch/clone" />
</div>

http://www.whatwg.org/specs/web-apps/current-work/#attributes-for-form-submission

The advantage of these new features is that they do all this declaratively without JavaScript. The disadvantage is that they are not supported on older browsers, so you'd have to do some polyfilling for older browsers.

C# – how to logout in windows mobile based application

Try this. Your main form becomes a "shell" with a logout button (or possibly you do that via a MainMenu object). Then rewrite your other forms into UserControls instead. Then when the user "moves" to a new page just initialise the usercontrol and slap it into the .Controls collection in your shell form (oh and remove the current one first :) ).

Technically you always remain on the first form this way, you don't need to duplicate the logout code/UI and moving the user back to the login page is easy, just remove the "Current" usercontrol and replace it with the "Login" user control.

Best Answer

Related Solutions

Html – How to overcome the HTML form nesting limitation

C# – how to logout in windows mobile based application

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