I'm having a strange problem, I've made a Select all checkbox, that mark as selected a lot of checkboxes.
This is the CheckedChanged event
protected void chkSelecionaTodasOcorrencias_CheckedChanged(object sender, EventArgs e)
{
if (chk_selecionaTodasOcorrencias.Checked)
{
foreach (ListItem c in chkBox_TiposOcorrencia.Items)
{
c.Selected = true;
}
}
else
{
foreach (ListItem c in chkBox_TiposOcorrencia.Items)
{
c.Selected = false;
}
}
chkBox_TiposOcorrencia.DataBind();
}
It checks all checkboxes, or uncheck all.
Then I Have another method that insert all checkedboxes in a list.
private List<int> insertItensInListIntegers(ListItemCollection itens)
{
int value = 0;
List<int> queryItens = new List<int>();
foreach (ListItem c in itens)
{
if (c.Selected) //<-- Here i'm getting false
{
tiposOcorrencias.TryGetValue(c.Text, out value);
queryItens.Add(value);
}
}
return queryItens;
}
The value informed in parameter is: chkBox_TiposOcorrencia.Items
At screen all checkboxes are cheched, but when I try debug, the c.Selected value is false.
Thanks in advance.
Like Freak_Droid was describing in his comment, if you are loading your checkboxes on pageload, simply put your code that loads your checkboxes inside an if statement checking for !ispostback. For example--
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//here is where you would put any of your code for databinding your checkboxes
}
}
Related
I have a project that using dropdownlist for choices.When check checkbox1 dropdown automatically bind data from database using table1 and when I check checkbox2 dropdown automatically binding data from database using table2.I do not want to use get data by using any button .How can I do that .Please help me.
here is code by using button:
public void LokasyonDoldur()
{
birimBUS = new BirimBUSV1();
List<BirimVO> birimVO = new List<BirimVO>();
DrpChcs.Items.Clear();
List<ListItem> items = new List<ListItem>();
birimVO = birimBUS.LokasyonlariGetir();
foreach (var item in birimVO)
{
items.Add(new ListItem(item.BirimAdi, item.ID.ToString()));
}
DrpChcs.Items.AddRange(items.ToArray());
}
public void BirimleriDoldur()
{
PoliklinikBUS poliklinikBUS = new PoliklinikBUS();
List<PoliklinikVO> poliklinikVO = new List<PoliklinikVO>();
DrpChcs.Items.Clear();
List<ListItem> items = new List<ListItem>();
poliklinikVO = poliklinikBUS.Poliklinikler();
foreach (var item in poliklinikVO)
{
items.Add(new ListItem(item.PoliklinikAdi, item.ID.ToString()));
}
DrpChcs.Items.AddRange(items.ToArray());
}
protected void BtnLokasyon_Click(object sender, EventArgs e)
{
if (ChckLctn.Checked == true && ChckBrm.Checked==false)
{
LokasyonDoldur();
}
else if (ChckLctn.Checked == false && ChckBrm.Checked == true)
{
BirimleriDoldur();
}
else
{
}
Button1.Visible = true;
BtnLokasyon.Visible = false;
}
protected void DrpChcs_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
KirilimId = Int32.Parse(DrpChcs.SelectedValue);
BPolikilinikID= KirilimId;
}
but I do not want to use this one.
ohh its another language. its hard to read. but what you basicly have to do is check which checkbox is checked in the page load and then load the dropdown based on what is loaded.
something like this. (I have typed it from my head so its not like copy-paste but you get the idea)
page_load
{
if(checkbox1.checked)
{
dropdown.dataitems = items1;
dropdown.databind();
return;
}
if(checkbox2.checked)
{
dropdown.dataitems = items2;
dropdown.databind();
return;
}
}
YOu can call the Button1_click event from the Dropdown list selected index changed event like this
Button1_Click(Button1,new EventArgs());
and in this you can hide that button from the page and in code behind you are calling the same function
OR
You can refactor the code in a seperate function from the button click event and call that function in the selected index changed event.
Please let me knwo if I misunderstood your question
Thanks
namespace Dynamic_Controls.Dropdowndynamic
{
public partial class DropdowndynamicUserControl : UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
if (ControlCount != 0)
{
Recreatecontrols();
}
}
private void Recreatecontrols()
{
// createtextboxes(ControlCount);
createtextboxes(2);
}
protected void createtextboxes(int ControlCount)
{
DynPanel.Visible = true;
for (int i = 0; i <= ControlCount; i++)
{
TextBox tb = new TextBox();
tb.Width = 150;
tb.Height = 18;
tb.TextMode = TextBoxMode.SingleLine;
tb.ID = "TextBoxID" + this.DynPanel.Controls.Count;
tb.Text = "EnterTitle" + this.DynPanel.Controls.Count;
tb.Load+=new EventHandler(tb_Load);
tb.Visible = true;
tb.EnableViewState = true;
DynPanel.Controls.Add(tb);
DynPanel.Controls.Add(new LiteralControl("<br/>"));
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Int32 newControlCount = Int32.Parse(DropDownList1.SelectedValue);
//createtextboxes(newControlCount);
//ControlCount+=newControlCount;
createtextboxes(2);
}
protected void Button1_Click(object sender, EventArgs e)
{
readtextboxes();
}
public void readtextboxes()
{
string x = string.Empty;
for (int a = 0; a < DynPanel.Controls.Count; a++)
{
foreach (Control ctrl in DynPanel.Controls)
{
if (ctrl is TextBox)
{
x = ((TextBox)ctrl).Text;
}
x+=x+("\n");
}
Result.Text = x;
}
}
private Int32 ControlCount
{
get
{
if (ViewState["ControlCount"] == null)
{
ViewState["ControlCount"] = 0;
}
return (Int32)ViewState["ControlCount"];
}
set
{
// ViewState["ControlCount"] = value;
ViewState["ControlCount"] = 2;
}
}
private void tb_Load(object sender, EventArgs e)
{
LblInfo.Text = ((TextBox)sender).ID + "entered";
}
}
}
Are you adding these controls dynamically in Page_Load (by, I'm assuming, calling your AddRequiredControl() method)? If so, is it wrapped in a conditional which checks for IsPostBack? The likely culprit is that you're destructively re-populating the page with controls before you get to the button click handler, so all the controls would be present but empty (as in an initial load of the page).
Also, just a note, if you're storing each control in _txt in your loop, why not refer to that variable instead of re-casting on each line. The code in your loop seems to be doing a lot of work for little return.
You need to recreate any dynamically created controls on or before Page_Load or they won't contain postback data.
I'm not entirely clear what happens on DropdownList changed - are you trying to preserve anything that has been entered already based on the textboxes previously generated?
In any event (no pun intended) you need to recreate exactly the same textboxes in or before Page_Load that were there present on the postback, or there won't be data.
A typical way to do this is save something in ViewState that your code can use to figure out what to recreate - e.g. the previous value of the DropDownList. Override LoadViewState and call the creation code there in order to capture the needed value, create the textboxes, then in the DropDownList change event, remove any controls that may have been created in LoadViewState (after of course dealing with their data) and recreate them based on the new value.
edit - i can't figure out how your code works now, you have AddRequiredControl with parameters but you call it with none. Let's assume you have a function AddRequiredControls that creates all textboxes for a given DropDownList1 value, and has this signature:
void AddRequiredControls(int index)
Let's also assume you have a PlaceHolder called ControlsPlaceholder that will contain the textboxes. Here's some pseudocode:
override void LoadViewState(..) {
base.LoadViewState(..);
if (ViewState["oldDropDownIndex"]!=null) {
AddRequiredControls((int)ViewState["oldDropDownIndex"]);
}
}
override OnLoad(EventArgs e)
{
// process data from textboxes
}
void DropDownList1_SelectedIndexChanged(..) {
ControlsPlaceholder.Controls.Clear();
AddRequiredControls(DropDownList1.SelectedIndex);
ViewState["oldDropDownIndex"]=DropDownList1.SelectedIndex;
}
Hi someone can tell me how to hide a LinkButton inside a DataList?
I've tried to do this but I do not work:
protected void Page_PreRender(object sender, EventArgs e)
{
foreach (var item in listanews)
{
DataList container = dlgestionenews;
if (string.IsNullOrEmpty(item.IdNews))
{
DataListItem itemdatalist = null;
foreach (DataListItem itemdl in container.Items)
{
foreach (Control control in itemdatalist.Controls)
{
if (control.GetType().FullName == "LinkButton")
{
((LinkButton)control).Visible = false;
}
}
}
}
}
}
Thanks!
Try this:
foreach (DataListItem dli in yourDataListControl.Items)
{
LinkButton lbLinkButton = (LinkButton)dli.FindControl("yourLinkButtonID");
if (lbLinkButton != null)
{
lbLinkButton.Visible = false;
}
}
You should move this code to the
protected virtual void OnItemDataBound(
DataListItemEventArgs e
)
event. In this event, you should use the e.Item.FindControl('LinkButtonID') method for the finding your control
More info is here
In my asp.net application i have created checkboxes at runtime. I want to disable the checked checkbox when i click on a button. How do I achieve this? Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
for (int i = 0; i < 12; i++)
{
tr = new TableRow();
tr.BorderStyle = BorderStyle.Groove;
for (int j = 0; j < 18; j++)
{
tc = new TableCell();
tc.BorderStyle = BorderStyle.Groove;
ch = new CheckBox();
tc.Controls.Add(ch);
tr.Cells.Add(tc);
}
Table1.Rows.Add(tr);
}
if(!IsPostBack)
{
form1.Controls.Add(ch);
mRoleCheckBoxList.Add("RoleName", ch);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
IDictionaryEnumerator RoleCheckBoxEnumerator = mRoleCheckBoxList.GetEnumerator();
while (RoleCheckBoxEnumerator.MoveNext())
{
CheckBox RoleCheckBox = (CheckBox)RoleCheckBoxEnumerator.Value;
string BoxRoleName = (string)RoleCheckBox.Text;
if (RoleCheckBox.Checked == true)
{
RoleCheckBox.Enabled = false;
break;
}
}
}
One rule-of-thumb while dealing with dynamically generated user controls is that you have to add them to the container on EVERY POSTBACK.
Just modify your code to generate the controls on every postback, and your code will start working like a charm!
EDIT
I am unsure what the ch variable is. I have assumed that its a checkbox. If I am correct, then all you have to do is to modify these lines
if(!IsPostBack)
{
form1.Controls.Add(ch);
mRoleCheckBoxList.Add("RoleName", ch);
}
to this
//if(!IsPostBack)
{
form1.Controls.Add(ch);
mRoleCheckBoxList.Add("RoleName", ch);
}
EDIT 2
This is the code for generating 10 checkboxes dynamically -
protected void Page_Init(object sender, EventArgs e)
{
CheckBox c = null;
for (int i = 0; i < 10; i++)
{
c = new CheckBox();
c.ID = "chk" + i.ToString();
c.Text = "Checkbox " + (i + 1).ToString();
container.Controls.Add(c);
}
}
Check the checkboxes when the page renders on the client side, click the button. This will cause a postback and the checkboxes will be generated again. In the click event of the button, you'll be able to find the checkboxes like this -
protected void Button1_Click(object sender, EventArgs e)
{
CheckBox c = null;
for (int i = 0; i < 10; i++)
{
c = container.FindControl("chk" + i.ToString()) as CheckBox;
//Perform your relevant checks here, and disable the checkbox.
}
}
I hope this is clear.
Maybe
RoleCheckBox.Parent.Controls.Remove(RoleCheckBox);
You are not getting a proper reference to your checkboxes - mRoleCheckBoxList is not mentioned as part of your checkbox creation.
Try the following in your button event handler:
foreach (TableRow row in Table1.Rows)
foreach (TableCell cell in row.Cells)
{
CheckBox check = (CheckBox)cell.Controls[0];
if (check.Checked) check.Enabled = false;
}
Always when creating dynamic controls in .Net create them here:
protected override void CreateChildControls()
{
base.CreateChildControls();
this.CreateDynamicControls();
} //eof method
and in the PostBack find the them either from the event trigger or from a non-dynamic control:
/// <summary>
/// Search for a control within the passed root control by the control id passed as string
/// </summary>
/// <param name="root">the upper control to start to search for</param>
/// <param name="id">the id of the control as string</param>
/// <returns></returns>
public virtual Control FindControlRecursively(Control root, string id)
{
try
{
if (root.ID == id)
{
return root;
} //eof if
foreach (Control c in root.Controls)
{
Control t = this.FindControlRecursively( c, id);
if (t != null)
{
return t;
} //eof if
} //eof foreach
} //eof try
catch (Exception e)
{
return null;
} //eof catch
return null;
} //eof method
I've created a control that extends the BoundField control to do some special processing on the data that's passed into it.
I now have a grid that has AutoGenerateColumns="true", by which I'd like to intercept the HeaderText, see if it's a particular value and then swap in the "SpecialBoundField" instead. I've tried using the OnDataBinding event to loop through the columns, but at this point there are no columns in the grid. I think that RowDataBound and DataBound are too late in the game so not sure what to do.
My next thought was to override the grid control itself to add in a "AutoGeneratingColumn" event in
protected virtual AutoGeneratedField CreateAutoGeneratedColumn(AutoGeneratedFieldProperties fieldProperties)
Can anyone help or point me in a better direction? Thanks!
If you have both fields coming back in the dataset, I would suggest setting the column visibilities instead of trying to dynamically add or change the datafields. Invisible columns don't render any HTML, so it would just be a matter of looking at the header row when it gets bound, checking the field you're interested in, and setting the column visibility.
void myGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
if (e.Row.Cells[1].Text = "BadText")
{
myGridView.Columns[1].Visible = false;
myGridView.Columns[5].Visible = true;
}
}
}
What I ended up with:
public class SpecialGridView : GridView
{
protected override void OnRowDataBound(GridViewRowEventArgs e)
{
ModifyData(e);
base.OnRowDataBound(e);
}
IList<string> _columnNames = new List<string>();
protected void ModifyData(GridViewRowEventArgs e)
{
LoadColumnNames(e);
if (e.Row.RowType == DataControlRowType.DataRow)
{
for (int i = 0; i < e.Row.Cells.Count; i++)
{
string currentColumnName = _columnNames[i];
if (IsSpecialColumn(currentColumnName))
{
string text = e.Row.Cells[0].Text;
bool isSpecialData = text.ToUpper() == "Y";
if (isSpecialData)
{
e.Row.Cells[i].CssClass += " specialData";
}
}
}
}
}
private void LoadColumnNames(GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
foreach (TableCell cell in e.Row.Cells)
{
_columnNames.Add(cell.Text);
}
}
}
private bool IsSpecialColumn(string currentColumnName)
{
foreach (string columnName in SpecialColumnNames)
{
if (currentColumnName.ToUpper() == columnName.ToUpper())
{
return true;
}
}
return false;
}
private IList<string> _specialColumnNames = new List<string>();
public IList<string> SpecialColumnNames
{
get { return _specialColumnNames; }
set { _specialColumnNames = value; }
}
}