Hi Houssam
This is Juan, lead Toolset developer, and the one in charge of Views.
First of all, let me apologize for the delay with this feature, and if we have caused you any issue.
I know this has been discussed a number of times, and in the past we already mentioned that we would evaluate and eventually bring this feature to Views, but the reality is that it is not that simple. Let me elaborate.
While the feature seems easy to grasp (use a set of frontend controls as checkboxes, each of them pointing to a range of values for a given custom field), and coding the solution does not seem to be entirely complex (because we have all the means to do so, like filtering by values BETWEEN a minimum and a maximum), the harder part here is providing a good GUI and shortcode options to cover this behavior.
Overall, for this feature we need to:
* Find a way to set minimin, maximum values, as well as the option label. Each option must have at least those three elements.
* Code how this will be rendered in the frontend, including all the different frontend controls (checkboxes, radios, select dropdowns, etc), which demands also a carefull review of data attributes on each control.
* Decide how this will be managed in the frontend, too. We need to post the form with two values for each selected option, plus the placeholder one that actually sets it as selected when the form returns content. This can be done fast (with hidden inputs that will populate your form) or with JavaScript, or making things more complex by storing data as part of the View settings (which involves invalidation, for example, when removing the filter).
* Besides that, we also need to check how this plays with existing parametric search features, like AJAXed results, and combinations with other Views features, like AJAX pagination and table sorting.
As you can see, it is quite a complex task in the end. Ww know this would be a quite usefull way of presenting parametric searc filters to visitors, but we have had other most needed tasks to work on, including security improvements, long-waiting features demanded by lots of users and several (several) bug fixes.
I can put this into the list of tasks that we will evaluate on the coming Views versions, but I can not guarantee that this will come to happen anytime soon.
Again, sorry about the late response and the bad news. I can bring you some good news.
You can indeed search for a range of values, although you need different controls for the minimum and maximum values You can have this with select dropdowns, although not with checkboxes. In the end, there are basic options to provide the search capabilities that you want to have, just not the exact way you want to have them.
Hope it helps.
Regards.