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QUESTION
I have a WPF app, linked to a SQL-server. I am using the MVVM-light package (I do actually have Prism.Core installed, but I'm not sure if I'm using it or not.... new to MVVM).
There's a DataGrid
, bound to an ObservableCollection
.
I have been trying to implement the PropertyChangedEventHandler
, but I can't seem to get it to work.
I have a Delete button bound, and I am able to remove rows, but when I re-open the form, the changes does not carry over.
I tried to change the binding-mode for the DataGrid
from OneWay
to TwoWay
. With OneWay
, the changes does not carry over when I re-open the form. With TwoWay
, I get this error message when opening the child form (which contains the DataGrid
):
System.InvalidOperationException: 'A TwoWay or OneWayToSource binding cannot work on the read->only property 'licenseHolders' of type 'Ridel.Hub.ViewModel.LicenseHoldersViewModel'.'
So, If I then add a set;
to my public ObservableCollection licenseHolders { get; }
,
the program runs, but the previous problem persists, like it did when there was a OneWay
mode configuration on the DataGrid
.
What do I need to do to get this to work without communicating directly with the Sql-server
, which would defy the whole point of using this methodology in the first place?
ANSWER
Answered 2021-Jun-15 at 13:26You are confusing topics. The VM needs InotifyPropertyChanged
events, which you have but are not using, to notify the Xaml in the front-end that a VMs property has changed and to bind to the new data reference.
This is needed for List
s or ObservableCollection
s. Once that is done, the ObservableCollection
will then send notifications on changes to the list as items are added or removed.
Because you miss the first step:
QUESTION
Hey to all in the forum
I use JSF Mojarra implementation, version JSF 2.2
I need desperately a help on this.
- I have a snippet of my page.
- I have a custom component "example_result.xhtml" used in the page.
- I have my BackingBean.java Be aware please that this code is not the real code I made. If you run it, it will be very ugly maybe because I deleted all the css classes and I kept only the hot stuff I need to show you my problem.
Everything is inside 1 form.
The 5 "h:selectManyCheckbox" (in my code I have 8 or 9)
In the form I have 5 "h:selectManyCheckbox" which are using values in the "value" attribute for different cases (javaFrameworks2Values, javaFrameworks3Values,...), and the "f:selectItems" use arrays of "SelectItem" (javaFrameworksSelectItems2, javaFrameworksSelectItems3...) created for these different cases, just to make some examples for me to understand how all the selectOne and selectMany components work. The ideas for this, about different cases were taken from these links: "https://stackoverflow.com/tags/selectonemenu/info" and "https://mkyong.com/jsf2/jsf-2-checkboxes-example".
After I have 2 commandButtons
1 for submit, and 1 for reset the values.
Display the values
After I display the results of the values of the "h:selectManyCheckbox" via the "example_result.xhtml".
You can see the 4th "h:selectManyCheckbox" that is the only one different, because it has the attribute "required" with the attribute "requiredMessage". With it there is a "h:message" to display the validation error.
In the BackingBean (which is Spring Bean, but it works perfectly good - sorry I don't want ejbs 3.x), I have initialized:
- The values of the SelectItems and
- The values of the "value" attribute, where the values of the "h:selectManyCheckbox" will be stored to be displayed later. [The code is completely castrated, to make it readable snippet].
When the page is rendered, I select checkBoxes (e.g. the 2 last, because the 2 first are initials) from all the "h:selectManyCheckbox". When I say that select from all, I mean it. And from the 4th with the "required" attribute. I try in the buttons (see in the code) the "Effort 1", or "Effort 2", or "Effort 3" (in the "f:ajax" in the buttons) and the result outputs in the last part are displayed and updated like a candy. Without any problem. To achive this with the composite component I googled and tried a lot. But I made it.
Then it comes the time to try the 4th to see the validation error of the "required" attribute.
I select again from all as before, but not from all. NOT from the 4th "h:selectManyCheckbox" this time. I select nothing from the 4th "h:selectManyCheckbox" to ckeck the validator error message ("requiredMessage"). The result is: It displays the message of error (GOOD until now), BUT this time it does not update anything from the others "h:selectManyCheckbox" to the output results at the end, and it does not reset the values as well as it was doing before (when I selected from all and from the 4th as well).
I understand that it says: as long as in the form the 4th failed with validation error, all the other "h:selectManyCheckbox" will not update the output results (something like wanting to fail all the others too).
But what really happes here?
- It does not give the values to the "h:selectManyCheckbox", to be updated to the output?
- It gives the vales to the "h:selectManyCheckbox" normally, BUT it just not updates the output?
The other efforts in the "f:ajax" in the buttons, are just efforts maybe to solve the problem but in these cases they don't even display the error message in the 4th case and of cource they don't update the other output results as well (again). But no message error as well.
I don't know if the problem is clear to you. I can explain in the discussion better so I can clarify the situation better. [To be honnet it took me 1 and half hour to write all this thing]
Thanks a lot in advance
========== Snippet from my page ==========
...ANSWER
Answered 2021-Jun-15 at 14:11After a lot of discussing with the only person who wanted to help to my issue here (and I thank him @WoAiNii for this a lot), I decided to post my solution:
I will make 5 different forms with 5 set of buttons (submit/reset), to make escalate this problem, for 5 so much related components in the form.
But my question is open: Why this is happening, what rule in JSF in this case is taking place and makes this situation. Anyone, comes with an explanation:
- Thomas: this is a rule in JSF, or
- is a JSF bug, or
- this happens in these cases, or... whatever...,
I will be glad to read it here so I will learn better, and others to will learn from these ideas of yours. Thanks a lot
QUESTION
Current situation : I have one GUI program(written by python) which using sqlite data stored on my computer.
Wishlist: I would like to have one server computer to locate sqlite data (DATA A1) (CRUD operation needed) and ten more client computer using GUI program(written by python) which connect with the sqlite data (DATA A1) on lan.
I have no idea how to set up this program and server and what I need to learn more.
Current example code for check product in shop:
...ANSWER
Answered 2021-Jun-15 at 04:15Don't do that. Sqlite
is a simple, in-memory, single-process database. If you need a database server, then use a database server. There are many choices.
QUESTION
I'm trying to limit a calculation only when a field is blank. I have many other fields that are calculated simultaneously, I would like to limit the calculation to only the fields that have not been filled.
I don't know JS very well, so I hope to be able to find help here ... Thanks for any answers, I leave more info below.
Basically everything works fine. However, when the bodyfat field is empty, the calculation for BMR and TDEE Katch McArdle and Cunningham Formula is performed.
What I am trying to do is to calculate the McArdle and Cunningham Formula fields only when the Bodyfat field contains values.
...ANSWER
Answered 2021-Jun-14 at 12:54I have added a if condition for checking body fat Now it will works fine.
QUESTION
How to extract from this JSON object "artist name", "popularity" and "uri" into a dataframe?
...ANSWER
Answered 2021-Jun-11 at 14:43if i understood the problem correctly you can try not to use list structure, edit it like this
QUESTION
I got a button (using MaterialDesign theme) in a WPF form button that is not styling correctly, where am I going wrong?. The button in the DataGrid is fine. I tried near Window on mainWindow doing Foreground="white" but when I take the theme off everything returns to nornal WPF form with the text colour (lower right) missing
app.xamp:
...ANSWER
Answered 2021-Jun-13 at 07:00it was because of Padding="15"
must've pushed the content outside the button area
QUESTION
I'm running java application(ksqldb 0.15.0) on GKE cluster, and passed the java opts -Xms3G
and -Xmx5G
.
-Xmx
option is working well, but -Xms
options seems not to be effected.
The running command is as follows;
...ANSWER
Answered 2021-Mar-30 at 23:38-Xms
sets the initial heap size, not the minimum size.
NGCMN
and OGCMN
denote the minimum capacity of the new generation and the old generation respectively. These numbers are useless most of the time. What you probably wanted to look at is NGC
/OGC
- the current capacity of the new generation and the old generation.
You've set -Xms3G
, and the current heap size is exactly
QUESTION
Following is the query I have written and I need to where conditions.
- Admin_Level_3_palika is not null
- Year = '2021'
However, the following query is still giving me null values for Admin_Level_3_palika
...ANSWER
Answered 2021-Jun-12 at 16:31change the or
to and
the line:
QUESTION
(new in javascript)
I am asked to remove a country (China) from the dropdown menu of the plugin intl-tel-input
the code below displays the dropdown menu and it looks that it calls the utils.js file to retain the countries
...ANSWER
Answered 2021-Jun-11 at 12:14If you take a look at the intl-tel-input
documentation regarding Initialisation Options. There is an option called excludeCountries
.
We can modify your initialisation code to include this option to exclude China:
QUESTION
How can I resize a *
column in the XamDataGrid
? In this example, I cannot resize the department
column.
MWE: MainWindow.xaml
ANSWER
Answered 2021-Jun-11 at 11:06Setting the department
field to Width="*"
prevents it from resizing. To enable resizing of this field it is necessary just remove the width setting in this column.
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