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Author's profile photo Anastasios Georgousakis
Anastasios Georgousakis
Posted on December 11, 2013 1 minute read

Item index in aggregation template

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We would like to have the index of aggregated element in the template generation. There are a lot of reasons someone needs the index of the aggregation item.

  1. Display the sequence of the item
  2. Display a control when it is the first, last, even or odd template
  3. Pass it as a parameter to an event
  4. Name an object according to the index

As an example we would like to use the index of aggregation in the name of a TextField

_addressEditFormElementTemplate: function(oController) {


     return new sap.ui.commons.form.FormElement(this.createId(‘fldAddress’), {

            label: new sap.ui.commons.Label(this.createId(‘lblAddress’), {

                text: ‘Address’

                }

            }),

            fields: [

                new sap.ui.commons.TextField(this.createId(‘inpAddress’), {

                    value: ‘{address}’,

                    name: ‘addresses[${index}].address’

                })

          ]

     });

}

Is it possible now?

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      • Author's profile photo Former Member
        Former Member

        Hi Anastasios,


        it is not really what you are asking for but might help you anyway: You could use the index of the data you are binding the control to. This breaks, of course, when you apply sorters or filters. But if the index you are asking about is equivalent with the position of the item inside the aggregation, then this might help. Here’s an example:

        
//--------------------------------------------------------------------
// define a model and set some data
var oModel = new sap.ui.model.json.JSONModel();
oModel.setData({"textMessages": [
    {"note": "Message A"},
    {"note": "Nachricht B"},
    {"note": "Message C"},
    {"note": "Zpráva D"},
    {"note": "Notizia E"}]});
// define a control with aggregation binding
var oList = new sap.ui.commons.ListBox();
oList.bindAggregation("items", "/textMessages",
  function(sId, oContext) {
      // get the path this item belongs to in the model
      var sPath = oContext.getPath();
      // get its index for enumeration
      var aParts = sPath.split("/");
      var iIdx = aParts[aParts.length - 1];
      // get the item itself using the path
      var oModel = oContext.getModel();
      var oItem = oModel.getProperty(sPath, oContext);
      // set a control combining the binding info as well as the item
      // itselfq
      return new sap.ui.core.ListItem(sId, {
          text: (iIdx + ". -- " + oItem.note)});});
// bind the model to the view
oList.setModel(oModel);
// insert into the html
oList.placeAt("main");

        HTH,

        M.

        PS: Maybe you should have gone for a `Discussion` rather than a `Blog Post` to get some more attention …