Modern browsers natively suppport file pickers that allow the user to choose multiple files at once. To activate this feature, set the multiple attribute:

<input type="file" name="images[]" multiple />

Or in a Rails view:

<%= file_field_tag "images[]", multiple: true %>

This works in IE10+.

Make sure that the field name ends in [] so your server-side code will parse the incoming files into an array. Obviously this naming convention is not compatible with default Rails nested attribute setters, so you'll need to write a form model to adapt.

Henning Koch

makandra.com

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Over 9 years ago

Henning Koch

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Source code in this card is licensed under the MIT License.

Async control flow in JavaScript: Promises, Microtasks, async/await

Slides for Henning's talk on Sep 21st 2017.

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Talking to synchronous (or "blocking") API

print('script start')
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Delivering Carrierwave attachments to authorized users only

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To attach files to your records, you will need a new database column representing the filename of the file. To do this, add a new migration (rails g migration <name>) with the following content:

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Posted by Henning Koch to makandra dev (2014-10-21 08:38)

HTML5: Allow to choose multiple files with a vanilla file picker

Related cards:

Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

Preparation

Summary

Introduction