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The options binding controls what options should appear in a drop-down list i. The value you assign should be an array or observable array. For a multi-select list, to set which of the options are selected, or to read which of the options are selected, use the selectedOptions binding.
For a single-select list, you can also read and write the selected option using the value binding. Note that the only difference between examples 3 and 4 is the optionsText value.
By default, the options binding will skip over i. If you want to show destroyed entries, then specify this additional parameter like:. If you need to run some further custom logic on the generated option elements, you can use the optionsAfterRender callback. See Note 2 below. For a multi-select list, you can read and write the selection state using selectedOptions.
Technically this is a separate binding, so it has its own documentation. The callback function is invoked each time an option element is inserted into the list, with the following parameters:. Extending the binding syntax Components Overview: What components and custom elements offer Defining and registering components The component binding Using custom elements Advanced: The "options" binding Purpose The options binding controls what options should appear in a drop-down list i.