I'm pretty new to Core Data and managed to get the NSTableView to show my Core Data values. The entity that the table uses is Emotes that have the two properties, Emote (string) and Usage (integer 16)
When a user selects a item, it will allow a person to copy that emote to clipboard. In order to do that, I need to get the ManagedObject of the selected row and send the Emote value in the object to the clipboard. I got the clipboard part, but stuck on the part in retrieving the data of the selected row from the data source.
What is the easiest way in getting the value of the selected row?
What is the easiest way in getting the value of the selected row?
The easiest way is to query the NSArrayController for
- (NSArray *)selectedObjects
You don't have to worry about what rows are selected; the table view will tell you what rows to copy by sending you (the data source) a tableView:writeRowsWithIndexes:toPasteboard: message.
Whatever you do in your implementation of tableView:objectValueForTableColumn:row:, you'll implement that method pretty much the same way, except that instead of retrieving and returning a single column value, you'll write (or at least promise) all of them at once, in whatever formats make sense, to the pasteboard.
Related
I want to save a specific value that is on a specific row and column. How I can do this? I already search, but I didn't find anything
One doesn't save a value from the grid but rather from the underlying dataset. The following is for Delphi, but I understand that Lazarus is near enough the same. Let's say that the grid is displaying data from a query qTest that has fields id, surname, forename, date of birth (DOB). In Delphi, one can automatically have variables created with names qTestID, qTestSurname, etc. Another way of referring to the variables is by use of the 'fieldbyname' syntax - qTest.fieldbyname ('surname').asstring.
Write a dblClick handler for the grid: when one gets to the row that holds the required data, perform a double click. In the handler, the fields of the row will now be available as qTestID.asinteger, qTestSurname.asstring, etc.
The Problem
I have a very complex, rather outdated jqgrid implementation that I'm upgrading to the latest free-jqgrid and we're having an issue in that after clearing the grid with unload, when we re-initialize the grid, the row ids are higher than they should be to start.
They seem to still be incrementing and not starting again. Are there some global counters I need to clear out to have the grid completely clear itself before we re-render it?
Grid Clear
if ( this.timesheet_grid ) {
this.timesheet_grid.grid.jqGrid( 'GridUnload' );
this.timesheet_grid.grid = null;
this.timesheet_grid = null;
Rows after GridUnload has been run
Shows an id like jqg56
Stuff I've Tried Since Posting
GridDestroy
clearGridBeforeUnload
SOLUTION
As #Oleg has suggested i simply needed to set the id attribute manually when processing the grid data.
I see that your incorrectly understand the meaning of rowids and the requirements for input data. I'm wonder especially about the suggestion of Tony to reset $.jgrid.guid. I find the suggestion very bad because it looks like a solution, but it can produce more seriously problems as the problems, which are solved!
First of all, it's important to understand what is rowid. Rowid is the values of id attribute of the grid rows: the id values of <tr> elements of the grid's body (see here). The rowid are used as a parameter of almost all callbacks and events of jqGrid. Because of that jqGrid must assign id attribute to every row and the input data of the grid have to contain rowid information! The existence of rowids is critical for working jqGrid. Only because of that jqGrid generates unique rowids in case of wrong input data. Alternative for generation of ids would be preventing creating the grid at all.
jqGrid tolerates the error with specifying the rowids in input data only for some simple grids, where one need just display some simple data and one never need to use rowids. If you use ids then you should fix the problem only in one way: you have to fix your input data. You can for example include id property with unique value in every element of input data. You should take in consideration that no id duplicates exist not only in the grid but on the whole HTML page. It's strictly recommended to use idPrefix option with unique value for every grid always if your HTML page have more as one grids (inclusive grid with subgrids).
Resetting of $.jgrid.guid is very dangerous and it can break functionality of jqGrid because of creating elements with duplicate id values. The property $.jgrid.guid is global. It's common over all grids and subgrids on the page. Simple subgrids scenario will produces id duplicates after you manually reset $.jgrid.guid. It will be used inside of $.jgrid.randId() method used in many places of jqGrid code. For example, the method addRow used by inlineNav uses the method.
I repeat my suggestion more clear once more. If you uses rowids or if the values of rowids are important for you in some way then you have to include id property to every item of input data. If some other property has already an unique value then you can add key: true in the corresponding column of colModel (one can use key: true in only one column). Alternatively, you can add prmNames: { id: "myId" } if myId property of input data contains unique rowid instead of default id property.
jqGrid uses common counter in order to be a sure that there will be no duplicate values when a build in id generator is used.
To reset the value you will need to set the guid parameter to 1 - i.e
$.jgrid.guid =1;
after you unload the grid
If the solution is based on the knowing the behavior of the product, then this is a good solution.
If we try to solve the problem, without to knowing the behavior - it is a dangerous solution.
It is very easy to say - this is bad solution and it is very very dangerous to use this solution - so my question is:
What is happen with the counter if the user reload the page under some conditions?
The answer is: the counter is reset and we go to the same situations which are described in the above answer.
I have a grid where the user can select records via checkbox in front of every record. Now I have a requirement to sort the records based on their selection, so that all selected records should be placed top, followed by the not selected ones.
Is there any standard function to achieve this? As an alternative I thought of saving the selection state as an attribute on every record and sort based on the attribute.
The code for the column is:
gridRealmDt.setSelectionType(SelectionStyle.SIMPLE);
gridRealmDt.setSelectionAppearance(SelectionAppearance.CHECKBOX);
I try to describe the code I use as the affected code is deeply nested in our own framework classes.
gridRealmDt is a subclass of smartgwt ListGrid. In my Dialog a create an instance of the grid which creates an instance of a database bound datasource. When the dialog is loaded the records are fetched from the database and after that a registered an dataArrivedHandler where I select the records which match records from another table.
I tried to place the selection attribute in an extra field and use that for sortig before my other sort criteria, but this does not work. Here is the code for the field I am using.
ListGridField txtSelected = new ListGridField(SELECTED, "");
txtSelected.setHidden(true);
txtSelected.setSortByDisplayField(true);
txtSelected.setCanSortClientOnly(true);
When I do not set the canSortClientOnly property the order by is sent to my database resulting in an error, as the table does not contain that field, so I set the property. Now I get following error
Removing field from the sort Specifier array because it specifies canSort Client Only: true and all data is not yet client-side.
I also tried to use a sortNormilizer on the Name field which is my main sort criteria, but the normalizer is called before the selection value is set to the record.
record.setAttribute(CARealmDS.SELECTED,selected ? "a" : "b");
I also cannnot find a way to call the normalizer when selection changes.
Currently we are using Smart GWT Version 6.0p.
I don't think there is any standard function. Just use grid store update. Place checked items first.
I have a abstract table (table or treetable view does not matter) view which have lots of column. But not all columns are visible at the same time. Now what i want to do, when i export the table contents to pdf/excel read each row data but actually in javafx we can not get row and cell data directly. For this we must use row/cell factory. But in this case this factory is called only when we add data to the table. I can read table data model for each row but in this case i must chek which columns are visible and invisible and which data model used always, and call the required method of the data model. Doing this required lots of code lines because as mentioned i have lots of column and nested column and also different data models. So during exporting to check all of these required lots of code line. But if i can read the row and cells of row i do't need to check invisible row and data model. Just read current row and data of cell. So my question is how can i solve this issued? Do you have any suggestion?
Any suggestion?
finally I solved this problem. Thanks for java documentation. I post some code snippet so who needs can use. For reading cell value on (row,column) intersection on TreeTableView
int rowIndex = treeTableView.getRow(treeRowItem);
for(int i=0;i<treeTable.getColumns();i++){
TreeTableColumn ttc = treeTable.getColumns().get(i);
String value = ttc.getCellData(rowIndex).toString();
}
you can also use the same logic on TableView
Is it possible to have data in a Handsontable sorted by a field which is not displayed? I have a grid of data which I would like to display that contains a column called "sortOrder", but I don't want to display this.
The sorting needs to be done client side because events are coming in over web sockets and need to be reflected in the table.
If you're not showing the column then I assume you're not expecting the user to be able to manually sort by this hidden column. Therefore, why don't you simply sort your data array with native JS? At any point during execution you could have a function which sorts by this hidden column and then just don't render this in your Handson definition.
So yes, the answer is it is possible. The not showing of a column is as simple as defining the columns option and not including a column for this hidden value.