Primeng: Text input readonly attribute

[just-paja]

PrimeNG needs to support readonly attribute for inputs. It was already mentioned and closed as #117 stating that issue is too common. Requesting to add support for readonly attribute to Text input.

I'm submitting a ... (check one with "x")

[ ] bug report => Search github for a similar issue or PR before submitting
[x] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

What is the motivation / use case for changing the behavior?
There is behavioral and semantic difference between readonly and disabled

• PrimeNG version: 4.1.1
• Browser: all
• Language: all

[cagataycivici]

Provide separate tickets per component please as this issue is too broad.

[just-paja]

@cagataycivici, "Text input read only attribute" is too broad? Can you please provide an example of less broad issue? I think this relates only to text input component.

[sabithpocker]

.ui-widget.read-only:disabled{
    opacity: 1;
    background-color: #dddddd;
}

                <input
                  type="text"
                  class="read-only"
                  disabled="disabled"
                  name="name"
                  [(ngModel)]="model.name" pInputText>