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jbe/bsw@0
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     1 --[[--
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     2 ui.link{
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     3   external  = external,   -- external URL
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     4   static    = static,     -- URL relative to the static file directory
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     5   module    = module,     -- module name
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     6   view      = view,       -- view name
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     7   action    = action,     -- action name
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jbe@53
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     8   attr      = attr,       -- for views: table of HTML attributes
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jbe@53
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     9   a_attr    = a_attr,     -- for actions: table of HTML attributes for the "a" tag
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jbe@53
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    10   form_attr = form_attr,  -- for actions: table of HTML attributes for the "form" tag
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    11   id        = id,         -- optional id to be passed to the view or action to select a particular data record
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    12   params    = params,     -- optional parameters to be passed to the view or action
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    13   routing   = routing,    -- optional routing information for action links, as described for ui.form{...}
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jbe@79
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    14   anchor    = anchor,     -- for views: anchor in destination URL
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    15   text      = text,       -- link text
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jbe@223
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    16   content   = content     -- link content (overrides link text, except for submit buttons for action calls without JavaScript)
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    17 }
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    18 
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    19 This function inserts a link into the active slot. It may be either an internal application link ('module' given and 'view' or 'action' given), or a link to an external web page ('external' given), or a link to a file in the static file directory of the application ('static' given).
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    20 
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    21 --]]--
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    22 
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    23 function ui.link(args)
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    24   local args = args or {}
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    25   local content = args.content or args.text
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    26   assert(content, "ui.link{...} needs a text.")
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    27   local function wrapped_content()
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    28     if args.image then
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    29       ui.image(args.image)
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    30     end
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    31     if type(content) == "function" then
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    32       content()
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    33     else
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    34       slot.put(encode.html(content))
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    35     end
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    36   end
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    37   if args.action then
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    38     local form_attr   = table.new(args.form_attr)
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    39     local form_id
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    40     if form_attr.id then
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    41       form_id = form_attr.id
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    42     else
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    43       form_id = ui.create_unique_id()
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    44     end
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    45     local quoted_form_id = encode.json(form_id)
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    46     form_attr.id      = form_id
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    47     local a_attr      = table.new(args.attr)
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    48     a_attr.href       = "#"
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    49     a_attr.onclick    =
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jbe@52
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    50       "var f = document.getElementById(" .. quoted_form_id .. "); if (! f.onsubmit || f.onsubmit() != false) { f.submit() }; return false;"
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    51     ui.form{
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    52       external = args.external,
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    53       module   = args.module or request.get_module(),
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    54       action   = args.action,
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    55       id       = args.id,
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    56       params   = args.params,
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    57       routing  = args.routing,
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    58       attr     = form_attr,
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    59       content  = function()
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    60         ui.submit{ text = args.text, attr = args.submit_attr }
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    61       end
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    62     }
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    63     ui.script{
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    64       type = "text/javascript",
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    65       script = (
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    66         "document.getElementById(" ..
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    67         quoted_form_id ..
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    68         ").style.display = 'none'; document.write(" ..
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    69         encode.json(
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    70           slot.use_temporary(
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    71             function()
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    72               ui.tag{
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    73                 tag     = "a",
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    74                 attr    = a_attr,
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    75                 content = wrapped_content
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    76               }
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    77             end
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    78           )
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    79         ) ..
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    80         ");"
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    81       )
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    82     }
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    83   else
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    84     -- TODO: support content function
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    85     local a_attr = table.new(args.attr)
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    86     a_attr.href = encode.url{
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    87       external  = args.external,
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    88       static    = args.static,
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    89       module    = args.module or request.get_module(),
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    90       view      = args.view,
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    91       id        = args.id,
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    92       params    = args.params,
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    93       anchor    = args.anchor
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    94     }
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    95     return ui.tag{ tag  = "a", attr = a_attr, content = wrapped_content }
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    96   end
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    97 end
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