How to set a dropdown box value in jQuery

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Select2 is licensed under MIT. Creating new options in the dropdown New options can be set option value javascript to a Set option value javascript control programmatically by creating a new Javascript Option object and appending it to the control:.

The third parameter of new Option The fourth parameter sets the options actual selected state - if set to truethe new option will be selected by default. When you make any external changes that need to be reflected in Select2 such as changing the valueyou should trigger this event.

This is further complicated by server-side filtering and pagination - there is no guarantee when a particular item will actually be loaded into the Select2 control!

The best way to deal with this, therefore, is to simply add the preselected item as set option value javascript new option.

For remotely sourced data, this will probably involve creating a new API endpoint in your server-side application that can retrieve individual items:. Notice that we manually trigger the select2: This allows other handlers to access additional properties of the selected item. You may clear all current selections in a Select2 control by setting the value of the control to null:. Getting Started Installation Basic usage Builds and modules 2. Troubleshooting Getting Help Common problems 3.

Data sources The Select2 data format Ajax remote data Arrays 7. Dynamic option creation Programmatic control Add, select, or clear items Set option value javascript selections Methods Events Upgrading What's new in set option value javascript. Docs maintained by Alexander Weissman. Getting Started Programmatic control Add, select, or clear items. Add, select, or clear items Creating new options in the dropdown New options can be added to a Select2 control programmatically by creating a new Javascript Option object and appending it to the control: Create if not exists You can use.

For remotely sourced data, this will probably involve creating a new API endpoint in your server-side application that can retrieve individual items: Clearing selections You may clear all current selections in a Select2 control by setting the value of the control to null:

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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. You should supply an array or observable array. Any previous options will be removed. However, if you want to let the user choose from an array of arbitrary JavaScript objects not merely strings , then see the optionsText and optionsValue parameters below.

Sometimes, you might not want to select any particular option by default. But a single-select drop-down list usually starts with some item selected, so how can you avoid preselecting something?

This easy to do: So, if myChosenValue holds the value undefined which observables do by default , then the dummy option will be selected. See Example 3 above to see how you can bind options to an array of arbitrary JavaScript object - not just strings. Example 3 shows how you can specify that property name by passing an additional parameter called optionsText.

See Example 4 above, which shows how you could generate the displayed text by concatenating together multiple property values. You can also specify a JavaScript function to determine this value.

Sometimes you may want to mark an array entry as deleted, but without actually losing record of its existence. This is known as a non-destructive delete. For details of how to do this, see the destroy function on observableArray. 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.