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forms jquery onload

Jquery Chosen focus on page load (onLoad?)

I’m using the Jquery Chosen plugin on a select box, however I’d like to focus this on page load. I’ve used the following code to focus a text input:

onLoad="document.forms.sales_order_form.customer.focus()"

But this doesn’t work for the select box:

<select data-placeholder="Select a Customer..." class="chzn-select" name="customer" style="width:400px;">
<option value=""></option>
</select>