How to add an empty row in the grid view at the top?
Insert at index 0 in your datasource.
e.g.
DataRow newRow;
newRow = dataSet.dataTable.NewRow();
newRow[0] = "a";
newRow[1] = "b";
// ...
dataSet.dataTable.Rows.InsertAt(myNewRow, 0);
Related
Is there a better way to calculate a moving sum of a list?
List<double?> rollingSum({int window = 3, List data = const []}) {
List<double?> sum = [];
int i = 0;
int maxLength = data.length - window + 1;
while (i < maxLength) {
List tmpData = data.getRange(i, i + window).toList();
double tmpSum = tmpData.reduce((a, b) => a + b);
sum.add(tmpSum);
i++;
}
// filling the first n values with null
i = 0;
while (i < window - 1) {
sum.insert(0, null);
i++;
}
return sum;
}
Well, the code is already clean for what you need. Maybe just some improvements like:
Use a for loop
You can use the method sublist which creates a "view" of a list, which is more efficient
To insert some values in the left/right of a list, there is a specific Dart method called padLeft, where you specify the lenght of the list which you want it to become (first parameter), then the value you want to use to fill it (second parameter). For example, if you have an array of N elements, and you want to fill it with X "null"s to the left, use padLeft(N+X, null).
List<double?> rollingSum({int window = 3, List data = const []}) {
List<double?> sum = [];
for (int i = 0; i < data.length - window + 1; i++) {
List tmpData = data.sublist(i, i + window);
double tmpSum = tmpData.reduce((a, b) => a + b);
sum.add(tmpSum);
}
sum.padLeft(window - 1, null);
return sum;
}
if I understand your problem correctly you can just calculate the window one time and in one loop you can for each iteration you can add the current element to the sum and subtract i - (window - 1)
so for an input like this
data = [1,2,3,4,5,6]
window = 3
the below code will result in [6,9,12,15]
int sum = 0;
List<double> res = [];
for (int i = 0;i<data.length;i++) {
sum += data[i];
if (i < window - 1) {
continue;
}
res.add(sum);
sum -= data[i - (window - 1)]; // remove element that got out of the window size
}
this way you won't have to use getRange nor sublist nor reduce as all of those are expensive functions in terms of time and space complexity
I using netbeans 8.
I need to loop to collect all employee ID from first column of jtable and store those IDs into an arraylist.
if (jTabledetail.getRowCount() > 0) {
String ecode = "";
int ishasRow = jTabledetail.getRowCount();// total 1 row
for (int r = 0; r <= ishasRow; r++) {// loop twice. First loop is gone, return to second loop or final loop for 1 row exists giving error bellow.
ecode = jTabledetail.getValueAt(r, 0).toString();
arrempcode.add(ecode);
}
}
I also tried changing to ==>> for (int r = 0; r < ishasRow; r++) but not worked.
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1 >= 1
at java.util.Vector.elementAt(Vector.java:474)
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:648)
at javax.swing.JTable.getValueAt(JTable.java:2717)
I don't understand the error. I known that the error comes from loop expression. I am not sure for this error.
Now my jtable named "jTabledetail" has 1 row exists.
Do I need to change something for this case of error? I am not sure that the loop expression is wrong.
Thank you very much.
DefaultTableModel tableModel = (DefaultTableModel) TableName.getModel();
Get the row count of the table
int rowCount = tableModel.getRowCount();
Declare ArrayList
ArrayList<Object> list = new ArrayList<Object>();
Traversing table and adding values into arraylist
for(int i=0; i<rowCount; i++){
for(int j=0; j<tableModel.getColumnCount(); j++){
if(j==0){
list.add(tableModel.getValueAt(i,j));
}
}
}
I have a function that counts and hides the number of columns that does not fit the screen. I want to exclude a column when resizing and hiding the columns. Here is what I have.
let ctrOfColumns = this.gridOptionsValue.columnApi.getAllColumns();
this returns the columns that i have. I want to exclude a specific column which has a colId of 'toBeExcludedId' so that It won't be included in the hiding of columns algo.
Here is my algo in hiding of the columns
let gridWidthOfMyTable = $('#idOfMyGrid').outerWidth();
let columnsToBeShown = [];
let columnsToBeHidden = [];
let totalWidthOfColumn = 0;
for(let x = 0 ; x < ctrOfColumns.length; x ++){
const singleColumn = ctrOfColumns[x];
totalWidthOfColumn += singleColumn.getMinWidth();
if (totalWidthOfColumn > gridWidthOfMyTable) {
columnsToBeHidden.push(singleColumn);
} else {
columnsToBeShown.push(singleColumn);
}
}
this.gridOptionsValue.columnApi.setColumnsVisible(columnsToBeShown, true);
this.gridOptionsValue.columnApi.setColumnsVisible(columnsToBeHidden, false);
There is no need to loop through all the values in your array. You can just use chaining and apply a filter directly to getAllColumns(), like this:
let ctrOfColumns = this.gridOptionsValue
.columnApi
.getAllColumns()
.filter((column) => column.colId !== 'toBeExcludedId');
I need the below macro to reference another sub change event to loop reference to the row number of the scroll bar, i and then adjust the cell Bi . So far I can only get 100 scroll bars to reference only B2
Sub Tester88()
Dim ScrollBar As Object
Dim rng As Range
Dim i As Long
Dim lastRow As Long
lastRow = 99 'Modify as needed this will be the last possible row to add a button
For i = 2 To lastRow Step 4
Set rng = ActiveSheet.Cells(i, 18) 'Column 3, row i
'## Create the button object and assign a variable to represent it
Set ScrollBar = ActiveSheet.ScrollBars.Add(1, 1, 1, 1)
'## use the btn variable to manipulate the button:
With ScrollBar
.Top = rng.Top
.Left = rng.Left
.width = rng.width
.height = rng.RowHeight
.Value = 1
.Min = 1
.Max = 100
.SmallChange = 1
.LargeChange = 10
.LinkedCell = "$B$2"
.Display3DShading = True
End With
Next
End Sub
It looks like you can just put the row in .LinkedCell instead of having it hardcoded. You've set it to a range of 1-100; keep in mind if you are using LinkedCell you are directly controlling the value of the cell, so if you are controlling data that has an existing set of values you need to either set the range (and the value) to the existing value of the cell, or have it as a cell that just shows the scroll bar value and use a formula referencing that cell for the final result you want.+
I've solved this task, so:
Sub Tester88()
Dim ScrollBar As Object
Dim rng As Range
Dim i As Long
Dim lastRow As Long
lastRow = 99 'Modify as needed this will be the last possible row to add a button
For i = 2 To lastRow Step 4
Set rng = ActiveSheet.Cells(i, 13) 'Column 3, row i
'## Create the button object and assign a variable to represent it
Set ScrollBar = ActiveSheet.ScrollBars.Add(1, 1, 1, 1)
'## use the btn variable to manipulate the button:
With ScrollBar
.Top = rng.Top
.Left = rng.Left
.Width = rng.Width
.Height = rng.RowHeight
.Min = 1
.Max = 100
.SmallChange = 1
.LargeChange = 1
.LinkedCell = "B" & i
End With
Next
End Sub
[Flextable1][Flextable2]
[Flextable3][Flextable4]
Inside every flextable: put vertical panel
inside every verticalpanel: consists of label and link shown as diagram below:
I want to use for loop in the flextable but i don't know where to start first.
Please help me to solve. Thanks.
It's a very simple code. Read inline comments for more info.
// root flex table that contains other widgets
FlexTable rootFlexTable = new FlexTable();
int counter = 0;
// 2 rows and 2 columns (change it as per your requirement)
for (int i = 0; i < 2; i++) { // rows
for (int j = 0; j < 2; j++) {// columns
counter++;
FlexTable flexTable = new FlexTable();
VerticalPanel verticalPanel = new VerticalPanel();
Label label = new Label("No " + counter + "(label)");
Hyperlink hyperlink = new Hyperlink("Name " + counter + "(link)",
"link" + counter);
verticalPanel.add(label);
verticalPanel.add(hyperlink);
// why are you using one extra flex table
// that contains only single component?
flexTable.setWidget(0, 0, verticalPanel);
// add inner flex table at row i and column j
rootFlexTable.setWidget(i, j, flexTable);
}
}
RootPanel.get().add(rootFlexTable);
Screenshot: