If you have large collections, you might want to let your customers change the order in which collection contents are displayed. You can do this by adding a sort order drop-down menu to your collection pages.

Demo
You can view a demo of this customization at the-new-standard-theme.myshopify.com.
To create the sort order drop-down menu, you will need to add code to your collection.liquid template.
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From your Shopify admin, click Online Store, and then click Themes (or press GWT).
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Find the theme you want to edit, click the ...button, and then click Edit HTML/CSS.
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Under the Templates heading, click collection.liquid to open your collection template in the online code editor. TipIf you're using the Brooklyn theme, click collection-template.liquid instead. 
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In a new browser tab, go to this gist file. 
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Copy the contents of this gist file. 
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Back in your admin, paste the code where you would like the sort order drop-down menu to appear on your collection page. TipFor Brooklyn, paste the code directly above the {% if settings.collection_tags_enable %}code in collection-template.liquid.
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Save your changes. 
 
        
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