I'm trying to implement a single option select dropdown list for my component, and I've gotten as far as displaying the data members and the correct values for them. However, I can't find any example within the SLDS website that gives me an idea of how to get this value out. I'm still new to working with Lightning(and front-end in general).

Here's the code I've written:

<aura:component>
<aura:attribute name="productCategories" type="Object[]"/>

<aura:handler name="change" value="{!v.productCategories}" action="{!c.doInit}"/>

<div class="slds-form-element__control">
    <div class="slds-select_container">
        <select id="categoryPicklist" class="slds-select">
            <option>All</option>
            <aura:iteration items="{!v.productCategories}" var="category" indexVar="index">
                <option>{!category.label}</option>
            </aura:iteration>
        </select>
    </div>
</div>

</aura:component>

How would I get the chosen option data and pass it into my controller?