Add Custom Button to Dynamics 365 CRM Form.

I have a requirement to add a custom button to dynamics CRM form (in the body) and not the header using ribbon workbench.

The existing customization is on dynamics 2011 , its unsupported and doesn't work for dynamics CRM, web-resources might be a good idea but they take lots of space , I want the button just next to a filed.

The existing java-script code is below

CustomSearchButton = function ()
    {
    var atrribute = document.getElementById("attribute_c").parentNode;
    AddButtonToRow(atrribute , "Custom Search", 150, CustomSearchFunction);
    };

The attribute is the schema name of the field.

Also some other deprecated methods from 2011 like AttachRefreshButtonToTextboxField() can this still be achieved in Dynamics 365