(0,5*left_picker*right_picker)/600

11 Answers

• Dennis

  I don't understand what you are using the comma for. Do you mean 0.5?

  What values do left_picker and right_picker contain?

  Do you want ((0.5 left_picker right_picker)/600) ?

• Hi Hal

  I am from Denmark where we use , instead of .

  Sorry about that. Left contains the numbers: 3,4,5,6,7,8,9,10,12,15,20 and right contains: 25,50,75,100,125,150,175,200,250,300,350,400,450,500,550,600

• Anybody who can help?

• Dennis, I think you have 2 columns in the picker, that you named left_picker and right_picker
  In this case you can use the change event to take the selectedValue that in your case will be an array with 2 elements ( at least this is what I know).

  Makes sense?

• Makes perfect sense, I just cannot figure out how to do this…

• 
  
  the_picker.addEvent('change', function(e) {
  
      the_label.text = (0.5*e.selectedValue[0]*e.selecteValue[1])/600;
  
  })
  

  it works?

• ups

  the_label.text = ...
  

  not value

• hmm no it makes an error in line 88, saying picker.addevent is not a function.

  Dennis

  // this sets the background color of the master UIView (when there are no windows/tab groups on it)
  Titanium.UI.setBackgroundColor('#000');
  
  // create tab group
  var tabGroup = Titanium.UI.createTabGroup();
  
  
  //
  // create base UI tab and root window
  //
  var win = Titanium.UI.createWindow({  
      title:'Calculate l/min',
      backgroundColor:'black',
  
  });
  
  
  
  var pickerview = Titanium.UI.createView({ 
  top:-159,
  
  });
  
  
  var picker = Ti.UI.createPicker();
  
  
  var speed = Ti.UI.createPickerColumn({opacity:0});
  speed.addRow(Ti.UI.createPickerRow({title:'Speed km/h', selected:true}));
  speed.addRow(Ti.UI.createPickerRow({title:'3',custom_item:'3'}));
  speed.addRow(Ti.UI.createPickerRow({title:'4',custom_item:'4'}));
  speed.addRow(Ti.UI.createPickerRow({title:'5',custom_item:'5'}));
  speed.addRow(Ti.UI.createPickerRow({title:'6',custom_item:'6'}));
  speed.addRow(Ti.UI.createPickerRow({title:'7',custom_item:'7'}));
  speed.addRow(Ti.UI.createPickerRow({title:'8',custom_item:'8'}));
  speed.addRow(Ti.UI.createPickerRow({title:'9',custom_item:'9'}));
  speed.addRow(Ti.UI.createPickerRow({title:'10',custom_item:'10'}));
  speed.addRow(Ti.UI.createPickerRow({title:'12',custom_item:'12'}));
  speed.addRow(Ti.UI.createPickerRow({title:'15',custom_item:'15'}));
  speed.addRow(Ti.UI.createPickerRow({title:'20',custom_item:'20'}));
  
  
  var volume = Ti.UI.createPickerColumn();
  volume.addRow(Ti.UI.createPickerRow({title:'Volume l/ha', selected:true}));
  volume.addRow(Ti.UI.createPickerRow({title:'25',custom_item:'25'}));
  volume.addRow(Ti.UI.createPickerRow({title:'50',custom_item:'50'}));
  volume.addRow(Ti.UI.createPickerRow({title:'75',custom_item:'75'}));
  volume.addRow(Ti.UI.createPickerRow({title:'100',custom_item:'100'}));
  volume.addRow(Ti.UI.createPickerRow({title:'125',custom_item:'125'}));
  volume.addRow(Ti.UI.createPickerRow({title:'150',custom_item:'150'}));
  volume.addRow(Ti.UI.createPickerRow({title:'175',custom_item:'175'}));
  volume.addRow(Ti.UI.createPickerRow({title:'200',custom_item:'200'}));
  volume.addRow(Ti.UI.createPickerRow({title:'250',custom_item:'250'}));
  volume.addRow(Ti.UI.createPickerRow({title:'300',custom_item:'300'}));
  volume.addRow(Ti.UI.createPickerRow({title:'350',custom_item:'350'}));
  volume.addRow(Ti.UI.createPickerRow({title:'400',custom_item:'400'}));
  volume.addRow(Ti.UI.createPickerRow({title:'450',custom_item:'450'}));
  volume.addRow(Ti.UI.createPickerRow({title:'500',custom_item:'500'}));
  volume.addRow(Ti.UI.createPickerRow({title:'550',custom_item:'550'}));
  volume.addRow(Ti.UI.createPickerRow({title:'600',custom_item:'600'}));
  
  
  
  // 2 columns as an array
  picker.add([speed,volume]);
  
  
  // turn on the selection indicator (off by default)
  picker.selectionIndicator = true;
  
  pickerview.add(picker);
  
  var label = Ti.UI.createLabel({
      text:'l/min.',
      top:400,
      width:'auto',
      height:'auto',
      textAlign:'left',
      color:'white',
      left:10,
  });
  
  
  picker.addEvent('change', function(e) {
  
      label.text = (0.5*e.selectedValue[0]*e.selecteValue[1])/600;
  
  })
  
  
  pickerview.add(label);
  win.add(pickerview);
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  var tab1 = Titanium.UI.createTab({  
      icon:'KS_nav_views.png',
      title:'l/min',
      window:win
  });
  
  
  
  
  
  
  //
  // create controls tab and root window
  //
  var win2 = Titanium.UI.createWindow({  
      title:'Tab 2',
      backgroundColor:'#fff'
  });
  var tab2 = Titanium.UI.createTab({  
      icon:'KS_nav_ui.png',
      title:'Tab 2',
      window:win2
  });
  
  var label2 = Titanium.UI.createLabel({
      color:'#999',
      text:'I am Window 2',
      font:{fontSize:20,fontFamily:'Helvetica Neue'},
      textAlign:'center',
      width:'auto'
  });
  
  win2.add(label2);
  
  
  
  //
  //  add tabs
  //
  tabGroup.addTab(tab1);  
  tabGroup.addTab(tab2);  
  
  
  // open tab group
  tabGroup.open();
  

• addEventListener not addEvent, sorry

• Got it to work! But how do I add some text behind the result? eg. "l/min"

  And how do I limit the digits to x.xx ??

• 
   label.text = ((0.5*e.selectedValue[0]*e.selecteValue[1])/600).toFixed(2)+'l/min';
  

  This is pure javascript, has nothing with Appcelerator, maybe you'd like to take a deeper look at the JS documentation :)