Chosen select an option by default with jQuery

Question

I have one select box with options and I am using jQuery "Chosen" on a Zend View. This plugin is working fine.

Javascript: $('#select_type').chosen(); 

My problem is I need to select one of the options when the page loads depending on what the value of type_id is. I tried this:

document.getElementById('select_type').value = '<?=$this->type_id?>'; 

This changes its value but the option is not selected in the JQuery chosen.

Any ideas?

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EDIT: The option successfully changes by doing what I have mentioned above but it does not update/change the selected element in jQuery "chosen" plugin. My question is about updating the selected value for jQuery Chosen not the HTML SELECT (which I have done successfully). Here is a link to jQuery Chosen plugin

Answer 1

Update list with JS

After you run:

document.getElementById('select_type').value = '<?=$this->type_id?>'; 

For Chosen version 1 and above (newer)

You should call:

$('#select_type').trigger('chosen:updated'); 

Taken from the Chosen documentation:

Updating Chosen Dynamically

If you need to update the options in your select field and want Chosen to pick up the changes, you'll need to trigger the "chosen:updated" event on the field. Chosen will re-build itself based on the updated content.

$("#form_field").trigger("chosen:updated");

See the change log for the announcement of this API change.

For Chosen versions below 1 (older)

You should call:

$('#select_type').trigger('liszt:updated'); 

Taken from the Chosen documentation:

Updating Chosen Dynamically

If you need to update the options in your select field and want Chosen to pick up the changes, you'll need to trigger the "liszt:updated" event on the field. Chosen will re-build itself based on the updated content.

• jQuery Version: $("#form_field").trigger("liszt:updated");
• Prototype Version: Event.fire($("form_field"), "liszt:updated");

Set the value before calling Chosen

Instead of doing this from JS why don't you just set the selected option in the HTML before calling the Chosen plugin with JavaScript? You are setting the value from a piece of PHP so I don't see why this couldn't be done.

Answer 2

You can just set the correct elements with the attribute selected like so:

<select name="teams[]" data-placeholder="Chose an option:"          class="chzn-select" multiple tabindex="6">     <option value=""></option>     <option selected="selected">Dallas Cowboys</option>     <option selected="selected">New York Giants</option>     <option>Philadelphia Eagles</option>     <option>Washington Redskins</option> </select> 

Chosen will take care to initialize itself and show the two pre-selected choices.