List

From NSB App Studio
Jump to: navigation, search

List.png

Description

The List control is used to display a menu list. Each line can have a name, a number and an image. Selecting one will call <ListID>_onclick(i), with i containing the line number chosen.

To add a control to your app, choose the control’s icon in the Toolbar, then position it on the Design Screen. Use the Property Editor to set the properties you need, then add functions to your code to respond to the events that come from the control: usually, just onclick.

If you have a List in a container, you cannot set the height of the list to a percentage with scrolling enabled. If you do, the list will not display. One workaround is to set height to auto and have a value for bottom.

Custom Icons

There are a few steps to using your own icon(s) instead of the built in ones.

1. In the Properties Window, put 'custom' into the icon property. (In the picker, it's the gray circle in the 4th row).

2. Add your icon(s) to the project. Dragging into the Project Explorer is fine. The icon(s) should be 16x16.

3. Add this code to the styleheaders property in Project Properties:

#List1_1:after {background-image: url("icon_16x16.png")}
#List1_2:after {background-image: url("icon_16x16.png")}

The first word on each line should be the name of the control with a # in front of it. Use the suffix _1, _2, etc.) after the control name to target a specific list row (e.g. #List1_1).

Properties

Standard properties are supported, plus:

ChangeForm A comma separated list of form names to go to if a line is clicked. If line is a divider, then leave a blank value. i.e.

,Form2,Form2

if the first line is a divider.

autoDividers Put dividers between different letters of the alphabet?
corners round or square.
dividers Is the item a divider? Comma separated list of Y and N. Design time.
dividerTheme Which theme should all the dividers have? A-z. Design time
filter Show a filter box above the list? Design time
filterPlaceholder Prompt to display in filter box. Design time
filterReveal If filter is true, only show matching items. A-z. Design time
icon The icon to show on the right of each list item. Design time
images Image file names for each line, comma separated. Design time
imageStyle None, 16x16 or 80x80. Design time
items List of item names, comma separated. Since commas act as separators, use &#44; instead of a comma in the middle of your text. Items can be plain text or HTML. Hard returns are ignored. Design time.
showNumbers Show numbers to the left of each item. True/false. Design time
getItem(i) Returns the text of item i.
getItemCount() Returns the number of of items. Runtime.
deleteItem("all") Delete all items. With no argument, just the last item is deleted. Runtime.
addItem(text, img, n, header) Add a new item at position n with text and img. text can be html. Runtime. If header is true, the line appears as a heading. Only text is required.
replaceItem(n, text, img) Replace item n with new text and optional img. Runtime.
refresh() Redraw list after updating. Runtime.
showNumbers true/false

Events

Standard events are supported. However, events are not usually associated with the control.

Example (BASIC)

Function List1_onclick(i)
  If TypeName(i)="object" Then Exit Function
  MsgBox "Menu item chosen: " & i & " " & List1.getItem(i)
End Function

Example (JavaScript)

List1.onclick=function(i){
  if(typeof i == "object") return;
  alert("Menu item chosen: " + i + " " + List1.getItem(i));
}

Other examples and tricks

Formatting items using HTML

List1.addItem("<table><tr><td width=30>1</td><td width=200>Beschreibung</td><td>19.99</td></tr></table>")

Change the color of the selected item

List1.children[i].style.background="yellow"     'jQM 1.3
List1_1.style.background="yellow"               'jQM 1.4

Change the font size of the list

   $(List1).find("li").css("fontSize", "10px")  'heading
   $(List1).find("a").css("fontSize", "10px")   'detail lines

Change the background color of the list

$("#List1 li").css("background-image", "none")
$("#List1 li").css("background-color", "yellow")

Load items from a database

This is a successCallback function which would be executed via the Sql command. For more details on that, see: Sql

Function successCallback(transaction, results)
  For i = 0 to results.rows.length
    List1.addItem(results.rows.item(i).columnName) 'where columnName is the name of your data column
  Next
End Function

You can add images too:

Function successCallback(transaction, results)
  Dim Text, ImgSrc
  For i = 0 to results.rows.length
    Text = results.rows.item(i).columnName
    ImgSrc = "img\" & (i+1) & ".png"    'images saved numbered under the older "img\" and deployed
    List1.addItem(Text,ImgSrc) 
  Next
End Function

Delete individual lines

It is better to clear the list using deleteItem("all") so new items will be created properly.

$("#List1_1").remove()

Use count bubbles

Choose One, Apples <span class='ui-li-count'>73</span>, Oranges <span class='ui-li-count'>82</span>

Change the height of a scrollable List at runtime

  List1.Height=200

Change the icon of the second line

  $(List1).children("li").each(changeIcon(2,List1_2))

Sub changeIcon(index, line)
  If index=1 Then
    $(line).buttonMarkup({ icon: "edit" })
  End If
End Sub

Scroll to line n

  List1_ref.scrollTo(0, -43 * n)

Scroll back to the top programmatically

  'The third argument is the speed. 
  'If you set it at zero, it is instant. 500 will take half a second.
  List1_ref.scrollTo(0,0,500)

  'or you can do this
  List1_scroller.scrollTop=100

ListView.png

Add a List item with a title and description

Function ListViewAddTitleDescription(lstView,Title,Description)
  Dim sText
  sText = "<h2>" & Title & "</h2>" & "<p>" & Description & "</p>"
  lstView.addItem(sText)
End Function

Add a List item with a counter

Function ListViewAddTitleCount(lstView,Title,Counted)
  Dim sText
  sText = Title & "<span class='ui-li-count'>" & Counted & "</span>"
  lstView.addItem(sText)
End Function

Add a List item with aside content

Function ListViewAddTitleAsideContent(lstView,Title,Content)
  Dim sText
  sText = Title & "<span class='ui-li-aside'><p>" & Content & "</p></span>"
  lstView.addItem(sText)
End Function

Detecting swipe motions

Sub Main()
  $(List1).on("swipeleft swiperight", onswipe )
End Sub

Function List1_ontouchmove(event)
  TextArea1.value="move " & event.target.getAttribute("nsbvalue") & vbCRLF & TextArea1.value
End Function


Function onswipe(event)
  TextArea1.value="swipe " & event.target.getAttribute("nsbvalue") & vbCRLF & TextArea1.value
End Function

Function List1_onswiperight(event)
  TextArea1.value="swiperight " & event.target.getAttribute("nsbvalue") & vbCRLF & TextArea1.value
End Function

Function List1_onswipe(event)
  TextArea1.value="swipeleft " & event.target.getAttribute("nsbvalue") & vbCRLF & TextArea1.value
End Function

Remove highlight from selected line

    $("#List1_" & i).css("background-color", RGB(246, 246, 246))

Change the text of a filter

    $("#List1 input").val("two").trigger("change")

Disable and Enable an item

 Function List1_onclick(i)
   If TypeName(i) = "object" Then Exit Function
   $("#List1_" & i).addClass("ui-state-disabled")
 End Function

 $("#List1_x").removeClass("ui-state-disabled") 'to enable it again

Output

(message box showing “Menu item chosen: 2 Two”)