ListView1_PagePropertiesChanged issue

Question

User-1578974752 posted

I have a List view with pager.

 Once the user click 2 (page2) in listview ,how can I make page 1 (That is only 1 showing below the list view ) to invisible and when they click  3 then 1 and 2 will become invisible so that user can not return to page 1 and 2 ,once they reach page 3.  Pageview properties of list view page is not familiar...How can I call the page number in Protected Sub ListView1_PagePropertiesChanged(sender As Object, e As EventArgs)

Appreciate the help

Protected Sub ListView1_PagePropertiesChanged(sender As Object, e As EventArgs)

Button1.Visible = True

  End Sub

Answer 1

User-893317190 posted

Hi shsu,

If you open F12 , you will find  the element which represents current page is a span and other  page numbers is represented as  <a> link .

So you could use js to finish your requirement.

Below is  the datapager  when the page number is three.

<span id="ListView1_DataPager1">
<a class="numeric_button" href="javascript:__doPostBack('ListView1$DataPager1$ctl00$ctl00','')">1</a>
&nbsp
;<a class="numeric_button" href="javascript:__doPostBack('ListView1$DataPager1$ctl00$ctl01','')">2</a>&nbsp;

<span class="current_page">3</span>&nbsp;
</span>

And my js .  DataPager1 is the id of your datapager.

$(function () {

            $("table [id*=DataPager1]  span").prevAll().hide()  // make all the a link hide

            })

The result.

Best regards,

Ackerly Xu

Answer 2

User-1578974752 posted

I didn't use javascript in my code.can provide how to incorporate in my code. Thanks

Answer 3

User-893317190 posted

Hi shsu

If you want to use code behind. You could  use listview's   OnPagePropertiesChanging and OnDataBound event.

Below is my code.

<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" ItemPlaceholderID="itemPlaceHolder" DataKeyNames="id"  OnPagePropertiesChanging="ListView1_PagePropertiesChanging"
            OnDataBound="ListView1_DataBound"
            >

Code behind.

 Private pageNumber As Int32    'record the currentPage
    Protected Sub ListView1_PagePropertiesChanging(sender As Object, e As PagePropertiesChangingEventArgs)
        pageNumber = e.StartRowIndex / e.MaximumRows
    End Sub

    Protected Sub ListView1_DataBound(sender As Object, e As EventArgs)   
        Dim pager As DataPager = CType(ListView1.FindControl("DataPager1"), DataPager) 'get the datapager
        For index = 0 To pageNumber - 1  'make previous page numbers invisiable
            pager.Controls(0).Controls(index * 2).Visible = False
        Next

    End Sub

Best regards,

Ackerly Xu

Answer 4

User-1578974752 posted

Protected Sub ListView1_PagePropertiesChanged(sender As Object, e As EventArgs)

'Dim list As ListView = ListView1

'Dim btn As Button = CType(list.FindControl("Button1"), Button)

Button1.Visible = True

Dim pageNumber As Integer = ((dtpgr.StartRowIndex) / dtpgr.MaximumRows) + 1

k = pageNumber

' Label1.Text = ""

End Sub

Protected Sub ListView1_DataBound(sender As Object, e As EventArgs)

Dim dtpgr As DataPager = CType(ListView1.FindControl("DataPager1"), DataPager) 'get the datapager

For index = 0 To k - 1 'make previous page numbers invisiable

dtpgr.Controls(0).Controls(index * 2).Visible = False

Next

End Sub

error is showing for the above code.

Answer 5

User-893317190 posted

Hi shsu,

I write

 pageNumber = e.StartRowIndex / e.MaximumRows

Your  code is

Dim pageNumber As Integer = ((dtpgr.StartRowIndex) / dtpgr.MaximumRows) + 1

Please remove the code I have hightlighted , it should be well.

Best regards,

Ackerly Xu

Answer 6

User-1578974752 posted

Done as below as your code .error is:

System.NullReferenceException: 'Object reference not set to an instance of an object. dtpgr is my pager name. Showing pager is Nothing.When I click page 2,this happened.When I click page 2,page 1 must become invisble.After saving Page 2 when I click page 3 both page 1 ang page 2 must become invisible.

Private pageNumber As Int32 'record the currentPage

Protected Sub ListView1_PagePropertiesChanging(sender As Object, e As PagePropertiesChangingEventArgs)

Button1.Visible = True

pageNumber = e.StartRowIndex / e.MaximumRows

End Sub

Protected Sub ListView1_DataBound(sender As Object, e As EventArgs)

Dim pager As DataPager = CType(ListView1.FindControl("dtpgr"), DataPager) 'get the datapager

For index = 0 To pageNumber - 1 'make previous page numbers invisiable

pager.Controls(0).Controls(index * 2).Visible = False

Next

End Sub

Answer 7

User-893317190 posted

Hi shsu,

I find you code 

<asp:Datapager ID="dtpgr" runat="server" pagedcontrolid="ListView1" Pagesize="5">

and , my code is to find tghe datapager , so you should change it to the id of your datapager.

Dim dtpgr As DataPager = CType(ListView1.FindControl("DataPager1"), DataPager) 'get the datapager

Please change it to

Dim dtpgr As DataPager = CType(ListView1.FindControl("dtpgr"), DataPager) 'get the datapager

Best regards,

Ackerly Xu

Answer 8

User-893317190 posted

Hi shsu,

I am sorry, I haven't seen your datapager is outside the listview,

Please change your code 

Dim dtpgr As DataPager = CType(ListView1.FindControl("DataPager1"), DataPager) 'get the datapage

To

Dim dtpgr As DataPager =dtpgr

Best regards,

Ackerly Xu

Answer 9

User-1578974752 posted

Tahnks Ackerly,It is working