I am disabling a checkbox column in a XtraGrid GridView with the following code (works as expected). Got the code from this post https://www.devexpress.com/Support/Center/Question/Details/Q423605:
private void GridViewWeeklyPlan_CustomDrawCell(object sender, DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e)
{
if (e.Column.FieldName == "Ignore")
{
CheckEditViewInfo viewInfo = ((GridCellInfo)e.Cell).ViewInfo as CheckEditViewInfo;
viewInfo.CheckInfo.State = DevExpress.Utils.Drawing.ObjectState.Disabled;
}
}
ISSUE
I want to enable the checkbox again when a certain column changes and has a value. This is where I am stuck and I thought I can change it in the GridView's CellValueChanged event, but I do not know how to reference the cell/column for the row:
private void GridViewWeeklyPlan_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)
{
if (e.Column.FieldName != "Reason") return;
if (String.IsNullOrEmpty(e.Value.ToString()))
{
//Make sure the checkbox is disabled again
}
else
{
//Enable the checkbox to allow user to select it
}
}
You need to refresh a cell in the Ignore column. You can do this by calling the GridView.RefreshRowCell method. To identify a row that you need to refresh, the CellValueChanged event provides the e.RowHandle parameter.
private void GridViewWeeklyPlan_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)
{
if (e.Column.FieldName != "Reason") return;
GridView view = (GridView)sender;
view.RefreshRowCell(e.RowHandle, view.Columns["Ignore"]);
}
The CustomDrawCell event will be raised again to update the cell appearance.
Related
I am working on a windows Forms Application and trying to validate few textboxes using errorproviders but the problem is when I am clicking on a button present in Tab 1, all the textboxes even present on a different tabs gets validated. I want the validation to occur for textboxes present on the current tab and not on any control present on any other tab. How can I achieve this? Please help. Below is the code related to validation in the click event.
private void btnCreateUser_Click(object sender, EventArgs e)
{
if (this.ValidateChildren(ValidationConstraints.Enabled))
{
// Some Code here
}
}
Below is code used for validating and validated event for one textbox. I am using similar code for other textboxes as well present on other tabs.
private void txtFirstNm_Validating(object sender, CancelEventArgs e)
{
bool cancel = false;
if (txtFirstNm.Text.Trim().Length == 0)
{
cancel = true;
errorProvider1.SetError(txtFirstNm,"Please enter First Name");
}
else
{
cancel = false;
errorProvider1.SetError(txtFirstNm, "");
}
e.Cancel = cancel;
}
private void txtFirstNm_Validated(object sender, EventArgs e)
{
errorProvider1.SetError(txtFirstNm,"");
}
The Scenario that is given in my question can be handled by using below code. We can use the ValidationConstraint as Visible and this will make sure that Validation occurs on the Current visible Controls.
private void btnCreateUser_Click(object sender, EventArgs e)
{
if (this.ValidateChildren(ValidationConstraints.Visible))
{
// Some Code here
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (ScriptManager.GetCurrent(this).IsInAsyncPostBack)
{
string id = ScriptManager.GetCurrent(Page).AsyncPostBackSourceElementID;
if (id == cboGroup.UniqueID)
{
foreach (ListItem i in lstTest.Items)
i.Selected = true;
}
}
}
This code runs when my cboGroup causes my UpdatePanel to refresh which has the lstTest in it and the data inside of it gets updated, but it does NOT select them all. How can I make it so when my UpdatePanel is finished refreshing all elements of the list box that it refreshed get selected?
[edit] I'm noticing now that at this point what's in the listbox is the previous values and not the new values I would need. So this seems to be before the listbox is filled with data (which is via a SqlDataSource) so it's probably overwriting this.
I was able to put my selection code in the list box's DataBound() event.
protected void lstTest_DataBound(object sender, EventArgs e)
{
SelectAllTest();
}
I have a series of checkboxes in an ASP.Net page. Every checkbox makes call to single function that accepts the checkbox id as a parameter.
The problem is that the code is now redundant. Is there a way to generalize the code. Attaching the sample code below:
protected void chkAddlDetails_CheckedChanged(object sender, EventArgs e)
{
if (chkAddlDetails.Checked == true)
{
blnShouldLock("chkAddlDetails");
Panel9.Visible = true;
}
else
{
Panel9.Visible = false;
}
}
protected void chkDeValidate_CheckedChanged(object sender,EventArgs e)
{
if (chkDeValidate.Checked == true)
{
blnShouldLock("chkDeValidate");
Panel10.Visible = true;
}
else
{
Panel10.Visible = false;
}
}
............
............ and similar code repeats for other check boxes
As the checkbox count is increasing the code is expanding and getting more redundant.
Can anyone assist to have a generalized code to avoid redundancy. Appreciate if a pseudo code can be provided.
Thank you.
Use the same event for all your checkboxes. You can then cast sender to the CheckBox that fired the event.
If each panel corresponds to a single checkbox, you can name the panels with the names of the checkboxes and suffix them with "Panel". For example a checkbox called chkDevalidate could have a panel called chkDevalidatePanel and the below method should work for all your checkboxes. If the same panel is shown or hidden by multiple checkboxes you'll need to map them between each other using a Dictionary or similar.
protected void GenericCheckedChanged(object sender, EventArgs e)
{
CheckBox checkbox = (CheckBox)sender;
Panel panel = (Panel)Page.FindControl(checkbox.ID + "Panel");
if (checkbox.Checked)
{
blnShouldLock(checkbox.ID);
panel.Visible = true;
}
else
{
panel.Visible = false;
}
}
or without an if.
panel.Visible = checkbox.Checked
I have a page to do a heirarchical search, it starts with a dropdownlist and based on the value selected in the dropdown it will query the database and show the childs in another dropdown list and this continues as long as it hits the leaf... so I've first dropdown added dynamically and it has the event handler on SelectedIndexChanged, when I change the selected value, it triggers the postback but however not calling event handler method.. Not sure what i'm doing wrong here.. or is it a bug??
Using a session variable to keep track the created controls
private List<DynamicControlProperties> PersistedControls
{
get
{
if (_persistedControls == null)
{
if (Session[PersistedControlsKey] == null)
{
Session[PersistedControlsKey] = new List<DynamicControlProperties>();
}
_persistedControls = Session[PersistedControlsKey] as List<DynamicControlProperties>;
}
return _persistedControls;
}
}
And in Page Init, recreating the dynamically generated controls
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
// regenerate the persisted controls
foreach (var prop in PersistedControls)
{
CreateControl(prop);
}
}
In page load, created the very first dropdown
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
// create the control
CreateControl(....)
// bind the data to the dropdown
}
}
In create control method, just creating a label and a dropdown wrap it inside a and adding it to place holder
private DropDownList CreateControl(DynamicControlProperties dynamiccntrlprop)
{
// create a new HTML row
HtmlGenericControlWithParentID tr = new HtmlGenericControlWithParentID("tr");
HtmlGenericControlWithParentID td1 = new HtmlGenericControlWithParentID("td");
HtmlGenericControlWithParentID td2 = new HtmlGenericControlWithParentID("td");
// make sure we set the id and parentid
tr.ID = string.Format("tr{0}", dynamiccntrlprop.ID);
tr.ParentID = dynamiccntrlprop.ParentID;
tr.EnableViewState = true;
// create a new label for dropdown
Label lbl = new Label() { ID = string.Format("lbl{0}", dynamiccntrlprop.DisplayName), Text = dynamiccntrlprop.DisplayName };
// create a new dropdown list
DropDownList ddl = new DropDownList()
{
ID = string.Format("ddl{0}", dynamiccntrlprop.DisplayName),
// set the postback
AutoPostBack = true,
EnableViewState = true
};
// subscribe for the select index changed event
ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
// add the controls to table row
td1.Controls.Add(lbl);
td2.Controls.Add(ddl);
tr.Controls.Add(td1);
tr.Controls.Add(td2);
// add the control to place holder
this.filtersPlaceHolder.Controls.Add(tr);
return ddl;
}
Here is the index changed handler,
protected void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
}
Enabled the viewstate,autopostback blah blah blah... recreated the controls with same id in post back.. tried all the answers in google.. but NO luck.. It does trigger the postback when i changed the index but not calling the event handler method..
Any ideas, please???
Many Thanks,
K
You have to make sure that The CreateControl method is called on each and every page postback. This needs to happen to ensure that the dynamic control's event handler is hooked up after the postback.
protected void Page_Load(object sender, EventArgs e)
{
// you shouldn't wrap the call to CreateControl in this 'if' statement
//if (!Page.IsPostBack)
//{
// create the control
CreateControl(....)
// bind the data to the dropdown
//}
}
once you do this, the selected index changed event will fire.
Maybe It is beacuse new value of the dropdownlist don't be loaded.
protected override void LoadViewState(object savedState)
{
// regenerate the persisted controls
foreach (var prop in PersistedControls)
{
CreateControl(prop);
}
base.LoadViewState(savedState);
}
I have SqlDataSource and GridView on web form. GridView.DataSourceID = mySqlDataSource.
When I call myGridView.DataBind(), all data successfully bind on the page.
How is it possible to read already got data from mySqlDataSource or myGridView objects as DataTable or DataView? Thanks
The data in the gridview can read by using FindControl property of Gridview control. For example, for reading values set in the Checkbox column in the grid.
for (i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox chk = (CheckBox)GridView1.Rows[i].FindControl("checkbox1");
//here code for using value captured in chk
}
Provided your data set isn't gigantic, you could store it in the Session, bind your GridView to the Session data, and then re-use the Session data in your other web objects.
Your code would then look something like this (you'll have to forgive any minor inaccuracies -- I'm away from my development box at the moment):
protected override OnInit(object sender, EventArgs e)
{
base.OnInit();
if (Page.IsPostback == false)
{
SetSessionData();
}
//
// Set your GridView, DataTable, DataView, etc. events here.
//
}
void SetSessionData();
{
List<YourDataBoundObject> myDataBoundObject = GetYourDataBoundObject(); // Or Collection<T>, IEnumerable<T>, etc.
Session["data"] = myDataBoundObject;
}
void YourGridView_Load(object sender, EventArgs e)
{
BindYourGridView();
}
void BindYourGridView()
{
YourGridView.DataSource = GetSessionData();
YourGridView.DataBind();
}
List<YourDataBoundObject> GetSessionData()
{
return (List<YourDataBoundObject>) Session["data"];
}
void YourDataTable_Load(object sender, EventArgs e)
{
BindYourDataTable();
}
void BindYourDataTable()
{
YourDataTable.DataSource = GetSessionData();
YourDataTable.DataBind();
}