I have an app with a KendoUI DropDownList that is populated with a list of tables from a database and a grid that is initially set with a columns atrribute of an empty array:
...
columns: []
...
The intent is to select a table from the list, send the table name to the server and have the server return JSON data containing the column names and the data from a "SELECT * FROM table" query. The data comes back as expected and the first time through I can use it as follows where "self" is just a reference to the grid in my view/model:
self.columns.removeAll();
for (var i = 0; i < joOutput["Cols"].length; i++) {
var col = { title: joOutput["Cols"][i], field: joOutput["Cols"][i] };
self.columns.push(col);
}
After extracting my data and assigning it to the grids datasource, the grid displays correctly with the correct column headers and data. However, when I select another table from the list and receive data from the server, the grid display does not update, even though it seems the grid columns have been updated though the execution of the above code. The end the result on screen is the column headers are the names of the columns from the first grid and the number of empty lines from the rows returned from the second query.
This dynamic manipulation of columns seems to be very difficult to do as seen by the forum post at http://www.kendoui.com/forums/ui/grid/dynamically-add-new-column.aspx but that post is over a year old now and I would've hoped some progress would've been made on this now, especially in light on the recent webcast on March 20 for the new release. So I guess the question remains: Is what I'm after even possible or am I SOL? Thanks.
You cannot dynamically change the columns of the grid after initialization. You can however create a new grid instance. Don't forget to call the destroy method of the old grid.
Related
I'm learning about Power Builder, and i don't know how to use these, (DWitemstatus, getnextmodified, modifiedcount, getitemstatus, NotModified!, DataModified!, New!, NewModified!)
please help me.
Thanks for read !
These relate to the status of rows in a datawindow. Generally the rows are retrieved from a database but this doesn't always have to be the case - data can be imported from a text file, XML, JSON, etc. as well.
DWItemstatus - these values are constants and describe how the data would be changed in the database.
Values are:
NotModified! - data unchanged since retrieved
DataModified! - data in one or more columns has changed
New! - row is new but no values have been assigned
NewModifed! - row is new and at least one value has been assigned to a column.
So in terms of SQL, a row which is not modified would not generate any SQL to the DBMS. A DataModified row would typically generate an UPDATE statement. New and NewModifed would typically generate INSERT statements.
GetNextModifed is a method to search a set of rows in a datawindow to find the modified rows within that set. The method takes a buffer parameter and a row parameter. The datawindow buffers are Primary!, Filter!, and Delete!. In general you would only look at the Primary buffer.
ModifedCount is a method to determine the number of rows which have been modifed in a datawindow. Note that deleting a row is not considered a modification. To find the number of rows deleted use the DeletedCount method.
GetItemStatus is a method to get the status of column within a row in a data set in a datawindow. It takes the parameters row, column (name or number), and DWBuffer.
So now an example of using this:
// loop through rows checking for changes
IF dw_dash.Modifiedcount() > 0 THEN
ll = dw_dash.GetNextModified(0,Primary!)
ldw = dw_dash
DO WHILE ll > 0
// watch value changed
IF ldw.GetItemStatus(ll,'watch',Primary!) = DataModified! THEN
event we_post_item(ll, 'watch', ldw)
END IF
// followup value changed
IF ldw.GetItemStatus(ll,'followupdate',Primary!) = DataModified! THEN
event we_post_item(ll, 'followupdate', ldw)
END IF
ll = ldw.GetNextModified(ll,Primary!)
LOOP
ldw.resetupdate() //reset the modifed flags
END IF
In this example we first check to see if any row in the datawindow has been modified. Then we get the first modified row and check if either the 'watch' or 'followupdate' columns were changed. If they were we trigger an event to do something. We then loop to the next modified row and so on. Finally we reset the modified flags so the row would now show as not being mofified.
I am trying to add rows to a grid using dhtmlx in java, following is the code.
var combinedColumn = "displayText";
displayOptionsGrid.addRow(selectedID, [ displayOptionsGrid.getRowsNum() == 0 ? 1 : 0, combinedColumn]);
What the function is supposed to do is that if the number of rows is zero it adds the first row as checked and then the rest as unchecked. The error which I am facing is, I delete the rows one by one and try to re-add the rows in the same session with some other row at first than the row I added previously, but can't. I can only add the row which I added first previously as the first row.
When I use grid.clearAll() it works fine. Can someone tell me the exact thing we do in clearAll() which we don't in deleteSelectedRows() in dhtmlxgrid. Thanks.
Please, check your selectedID attribute.
Note that each row should have a unique id, so adding a row with the id existing in your grid will break the grid.
My datasource has a column that contains a comma-separated list of numbers.
I want to create a dataset that takes those numbers and turns them into groupings to use in a bar chart.
requirements
numbers will be between 0-17 inclusive
groupings: 0-2,3-5,6-10,11-17
x-axis labels have to be the groupings
y-axis is the percent of rows that contain that grouping
note that because each row can contribute to multiple columns the percentages can add up to > 100%
any help you can offer would be awesome... i'm very new to BIRT and have been stuck on this for a couple days now
Not sure that I understand the requirements exactly, but your basic question "split dataset column into multiple rows" can be solved either using a scripted dataset or with pure SQL (depending on your DB).
Either way, you will need a second dataset (e.g. your data model is master-detail, and in your layout you will need something like
Table/List "Master bound to master DS
Table/List "Detail" bound to detail DS
The detail DS need the comma-separated result column from the master DS as an input parameter of type "String".
Doing this with a scripted dataset is quite easy IFF you understand Javascript AND you understand how scripted datasets work: Create a report variable "myValues" of type object with a default value of null and a second report variable "myValuesIndex" of type integer with a default value of 0.
(Note: this is all untested!)
Create the dataset "detail" as a scripted DS, with one input parameter "csv" of type String and one output parameter "value" of type String.
In the open event of the scripted DS, code:
vars["myValues"] = this.getInputParameterValue("csv").split(",");
vars["myValuesIndex"] = 0;
In the fetch event, code:
var i = vars["myValuesIndex"];
var len = vars["myValues"].length;
if (i < len) {
row["value"] = vars["myValues"][i];
vars["myValuesIndex"] = i+1;
return true;
} else {
return false;
}
For example, for the master DS result row with csv = "1,2,3-4,foo", the detail DS will result in 4 rows with
value = "1"
value = "2"
value = "3-4"
value = "foo"
Using an Oracle DB, this can be done without Javascript. The detail DS (with the same input parameter as above) would then look like:
select t.value as value from table(split(?)) t
For the definition of the split function, see RedFilter's answer on
Is there a function to split a string in PL/SQL?
If you get ORA-22813, you should change the original definition
create or replace type split_tbl as table of varchar2(32767);
to
create or replace type split_tbl as table of varchar2(4000);
as mentioned on https://community.oracle.com/thread/2288603?tstart=0
It's also possible with pure SQL in 11g using regexp_substr (see the same page).
create parameters in the scripted data set. we have to pass or link actual dataset values to scripted dataset parameters through DataSet parameter Binding after assigning the scripted data set to Table.
I need to keep the original DataTable and filter it based on list values. I've tried to hide rows that don't match up to the list but it doesn't work instantly. I don't want to copy the list to another dataTable and bind my dataGridView to is cause i have too much tied up to the original DataTable. Filtering only works for a few conditions but the list is holds only the values that are needed. Is there a LINQ solution to this? C# only please. This is how I got my list. There is another dataGridView that holds primary key for the datatable that I need to filter. It's key is held in a comboBox.
DataTable MainTable = MainDataSet.Tables["MyTable"];
DataTable lookupTable = lookupDataSet.Tables["MyLookupTable"];
var List = (from x in lookupTable.AsEnumerable()
where x.Field<string>("kAutoInc") == comboBox.SelectedValue.ToString()
select x.Field<int>("Pct")).ToList();
var a = MainTable.AsEnumerable().Where(r =>
List .Any(id => id == r.Field<int>("Pct")));
This gives me values of int 30, 40, 50, 60...
The DataGridView has a matching column "Pct" that I need to filter rows that only contain these values. I know it seems easy but I just can't seem to get it to work.
Please use DataView instead.
dataview dv=new dataview(datatable);
dv.filter=string.format("column1={0}","value1");
Like that.
I am using PowerBuilder classic 12.5
am having difficulties in inserting, editing, creating and printing reports.
i have a datawindow, dw_NewEmployee with dataobject, d_newrecord which is update-able.
should i use the columns to insert records through the columns or i
create single line texts on the window object
is the itemchanged event used on columns and rows on dataobject or
on single line texts... I am having trouble figuring out how to implement validation rules.
please give me an example to validate employee ID_Number
I see that you seem confused about the datawindow usage.
Let's try to summarize:
you create a new datawindow d_newrecord (say it is a grid) based on a sql select in your database, say select id_number, name from employee.
in the detail zone of the datawindow (that will be repeated for each record at runtime but that is only once in design), you need to put one column object for each column (here you will have id_number and name) these objects are both to display existing data and receive user input for editing data and inserting new records.
don't forget to set the Rows / Update properties if you need to make the dw updatable.
in the header zone of the datawindow you can have a static text associated to each column that is just here to display the column name, it does not concern table data.
in some window object, you place a datawindow control dw_newemployee where the content of the datawindow will be painted, you set d_newrecord as its dataobject.
you need to set at some point the transaction object of the dw, for example in the open() event of the window:
dw_newemployee.SetTransObject(sqlca)
dw_newemployee.Retreive() //if you are using some retreival arguments, don't forget to include them here
When you want to insert new data in your table (for example with a window button "add"), in the clicked() event of the button you call dw_newemployee.InsertRow(0) to insert at the end.
The ItemChanged() event will be triggered after one cell will be modified, you will be given the row, item (a dwobject) and new data. By choosing the returned value of the event, you can accept or reject the new data.
Here is an example for a field validation in itemchanged() event:
long ll_return_code = 0
string ls_column
ls_column = lower(dwo.name)
choose case ls_column
case "id_number"
if long(data) = 42 THEN
messagebox("validation error", "You cannot use 42 for the ID")
ll_return_code = 1 //reject and stay in cell
end if
case "name"
if data = "foobar" then
messagebox("validation error", "Do not use dummy value...")
ll_return_code = 2 //reject but allow to go elsewhere
end if
end choose
return ll_return_code