I have requirement as below
I want to navigate to a state of an mxmlcomponent (lets assume A) when I click on the mxmlComponentB's button.
how can this be possible?
There are plenty of ways this could be done. Given what context you've given, you could have component A listen to click event on component B's button, and the event handler could change state.
This is a pretty tightly coupled solution, though likely the most straight forward, so it depends on what else is going on with your app.
Related
Am using vb.net in asp.net to create my project. I use also a bootstrap modal to get data from client.
In the modal I have buttons and textboxes that get the data from user. there is a FINISH button that ends the process and closes the modal
the problem is that the other buttons are not supposed to close the modal, but make some calculations and processes. At one hand I need the postback in order to tiger the events of the buttons, And at the other hand the post back closes the modal, and i have to re-open it at the end of each process. This action makes the modal close and re-open after each click, and it is not Nice or Convenient
I thought that if I disable the postback of the buttons, and use the OnClientClick to catch the client click, this will work for me. But the Question is how can I make the OnClientClick Call a server side code (Sub)?
Any other Suggestions are welcome :)
OnClientClick is just that the CLIENT CLICK it doesn't translate into a server side method. Each ASP.Net server control has an OnClick event which is associated with a server based method, but that would give you the exact same scenario that you're dealing with now.
In this situation, I would have the secondary buttons (i.e. the ones that don't close the modal by behavior) use AJAX to send/receive data from the server (accessing an ASHX file or some other handler/WebAPI). This removes the entire postback situation entirely which sidesteps the issue.
I have my form with a menu bar and space underneath to display my controls. One of the buttons in my menu bar is suppose to be a print button that prints a graph that's currently in a User Control I display in the form. If the graph was on the form in the print button's eventhandler I could just simply call
graph.printing.print(true)
which isn't going to work in my case since the graph is in the control and not the form.
How do I communicate with a User Control from the containing form and access or pass its variables when needed? I also have a status bar on the bottom of the form which would also need to get updated from the User Control, but I'll be able to deal with that if I got help with just this one part. Please bear in mind, I also have another User Control I'm going to add to the form which will also contain a graph which will need the same treatment as the other graph on the first control when the print button is pressed. I plan on swapping these two out so I have one form displaying one control at a time.
I got this idea from this answer: https://stackoverflow.com/a/18191630/2567273 but after further research I can't find anyone asking about the actual communication process between a form and the control it contains.
I think this answer is close to what I'm looking for, but I think it's leading me down the path to using panels instead of User Controls.
After typing this I noticed the closest answer to my question may be this, but that question has the child raising events and the parent responding while I have the parent raising the event and the parent has to get information from the child.
One way to think about this is Roles. Presumably you built this UserControl to handle the management of the data related to the graphs. As such you can think of them in the Role of a Graphs Specialist . Once you do that, printing them is actually just one more thing it should perhaps do.
The form on the other hand, is not special just because it happens to get receive the command from the user to print. Its role in this might simply to be to know which usercontrol to contact and which method to invoke:
Sub PrintGraphMenuClick....
Select Case something ' determinant as to which UC to contact
Case operation.Foo
ucFoo.PrintGraph
Case operation.Bar
ucBar.PrintGraph
Other menu options like Clear, NewGraph, Save and whatever else there is somewhat the same way. The Form's Role here may be to receive the command from the user and pass it along to the right control, invoking the correct right method and passing the correct parameters - that is not a trivial task.
Of course, rather than a MainMenu, the usercontols could alternatively implement a ContextMenu and even receive those commands directly.
Very often offloading an operation to something else results in so many properties, filenames, streams etc having to be moved from here to there that it becomes burdensome. In this case it is not like the MainForm has some special ability regarding printers that the UserControl cannot handle.
There is only one right solution:
1) Add an event to your user control.
2) Raise the event when the particular "thing" happens in the user control.
3) Attach a handler to the event in Form code.
4) Add code to update the bottom bar in the event handler.
I am able to open a new window by clicking on a button in another window, but my requirement is that I should be able to listen to the events generated from the other window.
Can anybody help me? How can I register the events from one window and listen to them in the other, so that intercommunication can happen?
My answer would be that you shouldn't. Register your listeners in a common controller--that way, whatever events are fired by either window can be captured by the controller, and the controller can decide what needs to happen to what window in what circumstance.
I use TIBCO PageBus (http://developer.tibco.com/pagebus/default.jsp) for inter application events within my ExtJs applications. It is a JavaScript event bus. For instance, similar to what you describe, I have an editor window, which has a button to display a preview window. The editor window on a save, raises a update content event on the page bus, which the preview window subscribes to, upon receiving the event it refreshes the preview.
One of the advantages of this approach is that many clients can subscribe to events, if you have a complex application.
I have a Control say for ex a Submit button if user clicks the button twice or more continuously then user receiving same message / same operation taking place twice or more.
I need to avoid this situation.
thanks for your inputs.
You need to detect the button click event either in the code behind of the view (or ViewModel if using the MVVM pattern) and disable the button. Now I take it that your submit button is firing off some kind of asynchronous operation. Once the asynchronous operation has successfully completed you will probably need to enable the button so that it is available again.
Shankar, if you want to avoid clicking on button, you should disable it. If you can give more details about what exactly you are trying to do, more details can be given.
I've got two forms, one being frmMain and the other being frmDatasets. The idea is that frmDatasets is used to manage the application's datasets (it's a program for comparing sorting algorithms).
I have a MenuStrip on frmDatasets with a few items. I just decided to change the Add Dataset item to a drop-down menu with options for loading one from file, or generating one according to certain parameters. All well and good; just add the items, swap some icons around, and change the event handler's signature to handle the right Click event.
Except when I run the program, clicking on the Add Datasets top-level item for the first time sends frmDatasets to the back, displaying an inactive frmMain. Clicking the item again shows the dropdown menu as usual.
If I instead click another top-level menu item, that works just fine. But then simply hovering my mouse over the Add Dataset item causes the 'send to back' thing to happen.
I say "send to back", but it's really just putting it behind frmMain. It remains in front of other windows like Visual Studio and Firefox.
Anyone know what on Earth is going on with this form?
EDIT: If I show frmDatasets as a modal dialog, it stops the whole "sending to back" thing, but I still have to click the menu item twice before it shows the list.
EDIT2: Overriding the onClick event to call mnuAddDatasetDropDown.ShowDropDown removes the double-click issue, but it's only a solution if I keep the form as a modal dialog. Still gets sent to back. Overriding mouseEnter doesn't do anything to solve it.
Setting the TopMost property of frmDatasets from its Design view to 'true' fixed all of the problems I was having. No insight as to what was going on, unfortunately, but if anyone else is having this problem then hopefully it'll work for them too.