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Gravity Forms does not yet support slider fields. Until that time, this plugin may serve the purpose well.
The plugin adds a new slider field within the advanced field group. Customize your slider with the following set of options.
<h4>Supported Options</h4>
Native to Gravity Forms
<ul>
<li>field label</li>
<li>description</li>
<li>number format</li>
<li>range</li>
<li>handle connects</li>
<li>field label visibility</li>
<li>description placement</li>
<li>custom css class</li>
<li>field size</li>
<li>admin field label</li>
<li>default value</li>
<li>visibility</li>
<li>allow field to be populated dynamically</li>
<li>enable conditional logic</li>
</ul>
Custom
<ul>
<li>value relations (descriptive terms that relate to min & max number values of slider)</li>
<li>step (precision of values that can selected along the slider)</li>
<li>show value (select whether to hide, show on hover & drag, or always shows the currently selected value)</li>
<li>connect (visually connect the handle to the upper or lower edge of the slider)</li>
</ul>
If value relations have been defined, they will be displayed along with the field label in form entry details and when using merge tags.
<h4>Credits</h4>
In order to play nice with touch devices, Gravity Slider Fields utilizes <a href="http://refreshless.com/nouislider" title="noUiSlider" rel="nofollow ugc">noUiSlider</a> (developed by <a href="http://twitter.com/LeonGersen" rel="nofollow ugc">Léon Gersen</a>)

Gravity Slider Fields

This looks and appears nicely on Gravity Forms. However, I have calculated fields and it's only taking the default value I've set and not the updated value. My confirmation message repeats the slider value... and it's not the actual slider value it's the default.

Not working with calculated fields

Hackbard23

You are using the Contact Forms 7 Plugin and are angy about the none HTML 5 Support? 
No Problem. With this Plugin u will have the normal Datepicker & Number Spinner from jQuery in your Internet Explorers and other none HTML5 browsers.
If you have Questions or Feature Request, feel free and contact me.

Contact Form 7 IE DatePicker and Number Spinner Fix

Still works on actual WP 4.7.3. but the need to hack the date format in plugin it self makes it bit awkward.

missing set date format

Works like a charm!

Add the jQuery Datepicker and Spinner functionality to your Contact Form 7

Gravity Slider Fields vs Contact Form 7 IE DatePicker and Number Spinner Fix