HTML5: disabled vs. readonly form fields

In rare cases you might need something like form_for (for using form builder methods on the resulting block element) but without the surrounding form. One such case would be upda...

Any form fields where users enter numbers should be an <input type="number">.

Numeric inputs have several benefits over <input type="text">:

• On mobile or tablet devices, number fields show a special virtual keyboard that shows mostly digit...

Let's say we have posts with an attribute title that is mandatory.

Our example feature request is to tag these posts with a limited number of tags. The following chapters explain different approaches in Rails, how you can assign such a...

When HTTP clients make an request they can define which response formats they can process. They do it by adding a header to the HTTP request like this:

Accept: application/json

This means the client will only understand JSON respon...

Be careful!
The following solution will delete files on a volume. If you don't know exactly what you're doing, you can run into big trouble with your computer.

I play mp3 files on my car stereo that are stored on a SD-C...

You've been there: A form cannot be submitted, but you don't see a validation error because the field at fault has no corresponding input field on the form. Because this is usually a bug, you insert debug information listing all errors into the fo...

At least Selenium cannot find disabled fields. Unless you find them explicitly:

find_field 'This is disabled', disabled: true

In Webkit you can use the HTML5-attribute autofocus:

= form.text_field :title, :autofocus => 'autofocus'

Here is a jQuery fallback for browsers that don't speak HTML5:

var Autofocus = {

  supported: function() {
    retur...