I have some requirment which happen after the selecting from dropdown in combobox. But In some cases I getting default value. So for that which even i have to fier.
onchange and onselect is working when I select from the dropdown. But in my case I need event when Combo value is by default select.
So the change events don't fire when field's are created with a value so you will either have to run your post-change code after the init code (i.e. initComponent, constructor or render) or you could override the initValue method of the component and prevent it suspending those events on the initial value set.
Whether that's a good idea I'll leave up to you to decide!
Check out this Fiddle and the source file for the original code
Related
I use the onClick event to get values from a combo box. As here:
Me.ComboSelProject.Recordset.Fields(0).Value
On the first onClick event, no matter what row has been selected, the value is from the first row of the recordset. On subsequent onClick events the value is for the selected row.
The value shown in the face of the combobox is always the correct selected value. IOW comboSelProject.text is always correct.
I've tried to initialize the combobox in the Form_load() procedure using:
Me.ComboSelClient.Value = Me.ComboSelClient.ItemData(0) but this has not helped.
Thanks for any help ...
The click event happens before the change event. If you want to use the new value, use the Change event.
And you should probably try to initialize the .text of the combo box rather than the .value
I'm using Semantic-React and I have component-filter which consists of checkbox groups. Every checkbox has id and I must pass them in order to filter the results.First idea was to perform method which would be called after checkbox onCLick(which would pass checkbox id). And in this method set in state an object and after every checkbox click change it. I remember, that in Jquery exists $('form').serialize() which everytime checks form elements and gets checked values automaticaly. Exists something like this in react, or semantic-ui react? I would be simplier to use such method than to create and control object in state
You should use "controlled components":
Filter component should keep a set of checked ids as part of state.
Checkbox checked property should be set to true if the set contains box id (and to false otherwise) in Filter component render.
Checkbox onChange should be handled by filter component and modify state.
Filter can access it's state handling checkbox onChange or button "Apply" onClick (or any other event handled by Filter component).
Be careful: setState is an async function and directly reading other component state can lead to data race, so state must be read after proper event fired by React. Also there are a bunch of state-keepers like Redux.
It is described in official docs here: https://reactjs.org/docs/forms.html
I am facing one problem with textbox in angularjs.
When I am updating textfield data by some way(Like clicking button) then ng-change is not working. Please check plnkr
[https://plnkr.co/edit/32eE0ejSNBTkWJ4LVErR?p=preview][1]
When I am updating first name on button click ng-change is not firing, but when i am changing first name in textfield ng-change is getting fired
This behaviour is intended. It says this in the official documentation:
The ngChange expression is only evaluated when a change in the input
value causes a new value to be committed to the model.
It will not be evaluated:
if the value returned from the $parsers transformation pipeline has
not changed
if the input has continued to be invalid since the model will stay null
if the model is changed programmatically and not by a change to the input value
source
In your case, the last item in that list applies.
if the model is changed programmatically and not by a change to the input value
You'll have to use a watch in this case.
Introduction
I' m writing checkbox tree directive using angular. Part of the behaviour is when I check checkbox in the middle of the tree, I need to unset all ancestor checkboxes and set all descendant checkboxes (see screenshot, transparent checkboxes are unchecked in fact).
https://www.dropbox.com/s/yx1bzqsamunmjpx/Screenshot%20from%202014-08-25%2018%3A39%3A44.png?dl=0
I'm using:
itemScope.$watch('checked', function setCheckboxes(newValue, oldValue) { ... });
For descendants everything works fine. I forEach child checkboxes and set them a new value, which in turn fires events for their descendants and so forth.
Problem is with ancestors. If I set parent checked value to false, it triggers event which sets all children to false which is not desired.
Question starts here:
I need to find a way to update (ancestor checkbox) model without firing event I subscribed with $watch. I know one way to wrap new value assignment in setTimeout(fn, 1), but I think it's not cool. What's the correct way of doing this?
Thanks!
You could use the ngChange directive on the checkbox to kick off the correct behavior, rather than $scope.watch. From the docs:
The ngChange expression is only evaluated when a change in the input value causes a new value to be committed to the model.
It will not be evaluated:
if the value returned from the $parsers transformation pipeline has not changed
if the input has continued to be invalid since the model will stay null
if the model is changed programmatically and not by a change to the input value
When I change a value in a DataGridViewComboBoxCell the new value is not immediately applied until that cell leaves focus.
Is there a way to have the new value applied immediately?
If you handle the EditingControlShowing event on the DataGridView, you can attach an event handler to the underlying ComboBox's SelectedIndexChanged event (or SelectedValueChanged, or any other ComboBox event). It will fire immediately whenever the ComboBox value changes, and you can do whatever you want with the new value.
There's example code for this in the MSDN docs for DataGridViewComboBoxEditingControl.
DataGridView.CommitEdit Method
This might be of some use to you as well. Handle the CurrentCellDirtyStateChanged event, check for Dirty, and Commit the edit. Then you can use the CurrentCell property to access the value that was selected (assuming it was validated).
DataGridView1.EndEdit()
Ignore this text, answer must be at least 30 characters