module CGI::HtmlExtension
Mixin module providing HTML generation methods.
For example,
cgi.a("http://www.example.com") { "Example" } # => "<A HREF=\"http://www.example.com\">Example</A>"
Modules Html3, Html4, etc., contain more basic HTML-generation methods (#title
, #h1
, etc.).
See class CGI
for a detailed example.
Public Instance Methods
Generate an Anchor element as a string.
href
can either be a string, giving the URL for the HREF attribute, or it can be a hash of the element’s attributes.
The body of the element is the string returned by the no-argument block passed in.
a("http://www.example.com") { "Example" } # => "<A HREF=\"http://www.example.com\">Example</A>" a("HREF" => "http://www.example.com", "TARGET" => "_top") { "Example" } # => "<A HREF=\"http://www.example.com\" TARGET=\"_top\">Example</A>"
# File cgi/html.rb, line 97 def a(href = "") # :yield: attributes = if href.kind_of?(String) { "HREF" => href } else href end super(attributes) end
Generate a Document Base URI element as a String.
href
can either by a string, giving the base URL for the HREF attribute, or it can be a has of the element’s attributes.
The passed-in no-argument block is ignored.
base("http://www.example.com/cgi") # => "<BASE HREF=\"http://www.example.com/cgi\">"
# File cgi/html.rb, line 115 def base(href = "") # :yield: attributes = if href.kind_of?(String) { "HREF" => href } else href end super(attributes) end
Generate a BlockQuote element as a string.
cite
can either be a string, give the URI for the source of the quoted text, or a hash, giving all attributes of the element, or it can be omitted, in which case the element has no attributes.
The body is provided by the passed-in no-argument block
blockquote("http://www.example.com/quotes/foo.html") { "Foo!" } #=> "<BLOCKQUOTE CITE=\"http://www.example.com/quotes/foo.html\">Foo!</BLOCKQUOTE>
# File cgi/html.rb, line 134 def blockquote(cite = {}) # :yield: attributes = if cite.kind_of?(String) { "CITE" => cite } else cite end super(attributes) end
Generate a Checkbox Input element as a string.
The attributes of the element can be specified as three arguments, name
, value
, and checked
. checked
is a boolean value; if true, the CHECKED attribute will be included in the element.
Alternatively, the attributes can be specified as a hash.
checkbox("name") # = checkbox("NAME" => "name") checkbox("name", "value") # = checkbox("NAME" => "name", "VALUE" => "value") checkbox("name", "value", true) # = checkbox("NAME" => "name", "VALUE" => "value", "CHECKED" => true)
# File cgi/html.rb, line 180 def checkbox(name = "", value = nil, checked = nil) attributes = if name.kind_of?(String) { "TYPE" => "checkbox", "NAME" => name, "VALUE" => value, "CHECKED" => checked } else name["TYPE"] = "checkbox" name end input(attributes) end
Generate a sequence of checkbox elements, as a String.
The checkboxes will all have the same name
attribute. Each checkbox is followed by a label. There will be one checkbox for each value. Each value can be specified as a String, which will be used both as the value of the VALUE attribute and as the label for that checkbox. A single-element array has the same effect.
Each value can also be specified as a three-element array. The first element is the VALUE attribute; the second is the label; and the third is a boolean specifying whether this checkbox is CHECKED.
Each value can also be specified as a two-element array, by omitting either the value element (defaults to the same as the label), or the boolean checked element (defaults to false).
checkbox_group("name", "foo", "bar", "baz") # <INPUT TYPE="checkbox" NAME="name" VALUE="foo">foo # <INPUT TYPE="checkbox" NAME="name" VALUE="bar">bar # <INPUT TYPE="checkbox" NAME="name" VALUE="baz">baz checkbox_group("name", ["foo"], ["bar", true], "baz") # <INPUT TYPE="checkbox" NAME="name" VALUE="foo">foo # <INPUT TYPE="checkbox" CHECKED NAME="name" VALUE="bar">bar # <INPUT TYPE="checkbox" NAME="name" VALUE="baz">baz checkbox_group("name", ["1", "Foo"], ["2", "Bar", true], "Baz") # <INPUT TYPE="checkbox" NAME="name" VALUE="1">Foo # <INPUT TYPE="checkbox" CHECKED NAME="name" VALUE="2">Bar # <INPUT TYPE="checkbox" NAME="name" VALUE="Baz">Baz checkbox_group("NAME" => "name", "VALUES" => ["foo", "bar", "baz"]) checkbox_group("NAME" => "name", "VALUES" => [["foo"], ["bar", true], "baz"]) checkbox_group("NAME" => "name", "VALUES" => [["1", "Foo"], ["2", "Bar", true], "Baz"])
# File cgi/html.rb, line 234 def checkbox_group(name = "", *values) if name.kind_of?(Hash) values = name["VALUES"] name = name["NAME"] end values.collect{|value| if value.kind_of?(String) checkbox(name, value) + value else if value[-1] == true || value[-1] == false checkbox(name, value[0], value[-1]) + value[-2] else checkbox(name, value[0]) + value[-1] end end }.join end
Generate an File Upload Input element as a string.
The attributes of the element can be specified as three arguments, name
, size
, and maxlength
. maxlength
is the maximum length of the file’s name, not of the file’s contents.
Alternatively, the attributes can be specified as a hash.
See multipart_form()
for forms that include file uploads.
file_field("name") # <INPUT TYPE="file" NAME="name" SIZE="20"> file_field("name", 40) # <INPUT TYPE="file" NAME="name" SIZE="40"> file_field("name", 40, 100) # <INPUT TYPE="file" NAME="name" SIZE="40" MAXLENGTH="100"> file_field("NAME" => "name", "SIZE" => 40) # <INPUT TYPE="file" NAME="name" SIZE="40">
# File cgi/html.rb, line 276 def file_field(name = "", size = 20, maxlength = nil) attributes = if name.kind_of?(String) { "TYPE" => "file", "NAME" => name, "SIZE" => size.to_s } else name["TYPE"] = "file" name end attributes["MAXLENGTH"] = maxlength.to_s if maxlength input(attributes) end
Generate a Form element as a string.
method
should be either “get” or “post”, and defaults to the latter. action
defaults to the current CGI
script name. enctype
defaults to “application/x-www-form-urlencoded”.
Alternatively, the attributes can be specified as a hash.
See also multipart_form()
for forms that include file uploads.
form{ "string" } # <FORM METHOD="post" ENCTYPE="application/x-www-form-urlencoded">string</FORM> form("get") { "string" } # <FORM METHOD="get" ENCTYPE="application/x-www-form-urlencoded">string</FORM> form("get", "url") { "string" } # <FORM METHOD="get" ACTION="url" ENCTYPE="application/x-www-form-urlencoded">string</FORM> form("METHOD" => "post", "ENCTYPE" => "enctype") { "string" } # <FORM METHOD="post" ENCTYPE="enctype">string</FORM>
# File cgi/html.rb, line 310 def form(method = "post", action = script_name, enctype = "application/x-www-form-urlencoded") attributes = if method.kind_of?(String) { "METHOD" => method, "ACTION" => action, "ENCTYPE" => enctype } else unless method.has_key?("METHOD") method["METHOD"] = "post" end unless method.has_key?("ENCTYPE") method["ENCTYPE"] = enctype end method end if block_given? body = yield else body = "" end if @output_hidden body << @output_hidden.collect{|k,v| "<INPUT TYPE=\"HIDDEN\" NAME=\"#{k}\" VALUE=\"#{v}\">" }.join end super(attributes){body} end
Generate a top-level HTML element as a string.
The attributes of the element are specified as a hash. The pseudo-attribute “PRETTY” can be used to specify that the generated HTML string should be indented. “PRETTY” can also be specified as a string as the sole argument to this method. The pseudo-attribute “DOCTYPE”, if given, is used as the leading DOCTYPE SGML tag; it should include the entire text of this tag, including angle brackets.
The body of the html element is supplied as a block.
html{ "string" } # <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML>string</HTML> html("LANG" => "ja") { "string" } # <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML LANG="ja">string</HTML> html("DOCTYPE" => false) { "string" } # <HTML>string</HTML> html("DOCTYPE" => '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">') { "string" } # <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><HTML>string</HTML> html("PRETTY" => " ") { "<BODY></BODY>" } # <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> # <HTML> # <BODY> # </BODY> # </HTML> html("PRETTY" => "\t") { "<BODY></BODY>" } # <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> # <HTML> # <BODY> # </BODY> # </HTML> html("PRETTY") { "<BODY></BODY>" } # = html("PRETTY" => " ") { "<BODY></BODY>" } html(if $VERBOSE then "PRETTY" end) { "HTML string" }
# File cgi/html.rb, line 403 def html(attributes = {}) # :yield: if nil == attributes attributes = {} elsif "PRETTY" == attributes attributes = { "PRETTY" => true } end pretty = attributes.delete("PRETTY") pretty = " " if true == pretty buf = "".dup if attributes.has_key?("DOCTYPE") if attributes["DOCTYPE"] buf << attributes.delete("DOCTYPE") else attributes.delete("DOCTYPE") end else buf << doctype end buf << super(attributes) if pretty CGI.pretty(buf, pretty) else buf end end
Generate an Image element as a string.
src
is the URL of the image. alt
is the alternative text for the image. width
is the width of the image, and height
is its height.
Alternatively, the attributes can be specified as a hash.
img("src", "alt", 100, 50) # <IMG SRC="src" ALT="alt" WIDTH="100" HEIGHT="50"> img("SRC" => "src", "ALT" => "alt", "WIDTH" => 100, "HEIGHT" => 50) # <IMG SRC="src" ALT="alt" WIDTH="100" HEIGHT="50">
# File cgi/html.rb, line 474 def img(src = "", alt = "", width = nil, height = nil) attributes = if src.kind_of?(String) { "SRC" => src, "ALT" => alt } else src end attributes["WIDTH"] = width.to_s if width attributes["HEIGHT"] = height.to_s if height super(attributes) end
Generate a Form element with multipart encoding as a String.
Multipart encoding is used for forms that include file uploads.
action
is the action to perform. enctype
is the encoding type, which defaults to “multipart/form-data”.
Alternatively, the attributes can be specified as a hash.
multipart_form{ "string" } # <FORM METHOD="post" ENCTYPE="multipart/form-data">string</FORM> multipart_form("url") { "string" } # <FORM METHOD="post" ACTION="url" ENCTYPE="multipart/form-data">string</FORM>
# File cgi/html.rb, line 500 def multipart_form(action = nil, enctype = "multipart/form-data") attributes = if action == nil { "METHOD" => "post", "ENCTYPE" => enctype } elsif action.kind_of?(String) { "METHOD" => "post", "ACTION" => action, "ENCTYPE" => enctype } else unless action.has_key?("METHOD") action["METHOD"] = "post" end unless action.has_key?("ENCTYPE") action["ENCTYPE"] = enctype end action end if block_given? form(attributes){ yield } else form(attributes) end end
Generate a Password Input element as a string.
name
is the name of the input field. value
is its default value. size
is the size of the input field display. maxlength
is the maximum length of the inputted password.
Alternatively, attributes can be specified as a hash.
password_field("name") # <INPUT TYPE="password" NAME="name" SIZE="40"> password_field("name", "value") # <INPUT TYPE="password" NAME="name" VALUE="value" SIZE="40"> password_field("password", "value", 80, 200) # <INPUT TYPE="password" NAME="name" VALUE="value" SIZE="80" MAXLENGTH="200"> password_field("NAME" => "name", "VALUE" => "value") # <INPUT TYPE="password" NAME="name" VALUE="value">
# File cgi/html.rb, line 542 def password_field(name = "", value = nil, size = 40, maxlength = nil) attributes = if name.kind_of?(String) { "TYPE" => "password", "NAME" => name, "VALUE" => value, "SIZE" => size.to_s } else name["TYPE"] = "password" name end attributes["MAXLENGTH"] = maxlength.to_s if maxlength input(attributes) end
Generate a sequence of radio button Input elements, as a String.
This works the same as checkbox_group()
. However, it is not valid to have more than one radiobutton in a group checked.
radio_group("name", "foo", "bar", "baz") # <INPUT TYPE="radio" NAME="name" VALUE="foo">foo # <INPUT TYPE="radio" NAME="name" VALUE="bar">bar # <INPUT TYPE="radio" NAME="name" VALUE="baz">baz radio_group("name", ["foo"], ["bar", true], "baz") # <INPUT TYPE="radio" NAME="name" VALUE="foo">foo # <INPUT TYPE="radio" CHECKED NAME="name" VALUE="bar">bar # <INPUT TYPE="radio" NAME="name" VALUE="baz">baz radio_group("name", ["1", "Foo"], ["2", "Bar", true], "Baz") # <INPUT TYPE="radio" NAME="name" VALUE="1">Foo # <INPUT TYPE="radio" CHECKED NAME="name" VALUE="2">Bar # <INPUT TYPE="radio" NAME="name" VALUE="Baz">Baz radio_group("NAME" => "name", "VALUES" => ["foo", "bar", "baz"]) radio_group("NAME" => "name", "VALUES" => [["foo"], ["bar", true], "baz"]) radio_group("NAME" => "name", "VALUES" => [["1", "Foo"], ["2", "Bar", true], "Baz"])
# File cgi/html.rb, line 685 def radio_group(name = "", *values) if name.kind_of?(Hash) values = name["VALUES"] name = name["NAME"] end values.collect{|value| if value.kind_of?(String) radio_button(name, value) + value else if value[-1] == true || value[-1] == false radio_button(name, value[0], value[-1]) + value[-2] else radio_button(name, value[0]) + value[-1] end end }.join end
Generate a reset button Input element, as a String.
This resets the values on a form to their initial values. value
is the text displayed on the button. name
is the name of this button.
Alternatively, the attributes can be specified as a hash.
reset # <INPUT TYPE="reset"> reset("reset") # <INPUT TYPE="reset" VALUE="reset"> reset("VALUE" => "reset", "ID" => "foo") # <INPUT TYPE="reset" VALUE="reset" ID="foo">
# File cgi/html.rb, line 720 def reset(value = nil, name = nil) attributes = if (not value) or value.kind_of?(String) { "TYPE" => "reset", "VALUE" => value, "NAME" => name } else value["TYPE"] = "reset" value end input(attributes) end
Generate a submit button Input element, as a String.
value
is the text to display on the button. name
is the name of the input.
Alternatively, the attributes can be specified as a hash.
submit # <INPUT TYPE="submit"> submit("ok") # <INPUT TYPE="submit" VALUE="ok"> submit("ok", "button1") # <INPUT TYPE="submit" VALUE="ok" NAME="button1"> submit("VALUE" => "ok", "NAME" => "button1", "ID" => "foo") # <INPUT TYPE="submit" VALUE="ok" NAME="button1" ID="foo">
# File cgi/html.rb, line 750 def submit(value = nil, name = nil) attributes = if (not value) or value.kind_of?(String) { "TYPE" => "submit", "VALUE" => value, "NAME" => name } else value["TYPE"] = "submit" value end input(attributes) end
Generate a text field Input element, as a String.
name
is the name of the input field. value
is its initial value. size
is the size of the input area. maxlength
is the maximum length of input accepted.
Alternatively, the attributes can be specified as a hash.
text_field("name") # <INPUT TYPE="text" NAME="name" SIZE="40"> text_field("name", "value") # <INPUT TYPE="text" NAME="name" VALUE="value" SIZE="40"> text_field("name", "value", 80) # <INPUT TYPE="text" NAME="name" VALUE="value" SIZE="80"> text_field("name", "value", 80, 200) # <INPUT TYPE="text" NAME="name" VALUE="value" SIZE="80" MAXLENGTH="200"> text_field("NAME" => "name", "VALUE" => "value") # <INPUT TYPE="text" NAME="name" VALUE="value">
# File cgi/html.rb, line 782 def text_field(name = "", value = nil, size = 40, maxlength = nil) attributes = if name.kind_of?(String) { "TYPE" => "text", "NAME" => name, "VALUE" => value, "SIZE" => size.to_s } else name["TYPE"] = "text" name end attributes["MAXLENGTH"] = maxlength.to_s if maxlength input(attributes) end
Generate a TextArea element, as a String.
name
is the name of the textarea. cols
is the number of columns and rows
is the number of rows in the display.
Alternatively, the attributes can be specified as a hash.
The body is provided by the passed-in no-argument block
textarea("name") # = textarea("NAME" => "name", "COLS" => 70, "ROWS" => 10) textarea("name", 40, 5) # = textarea("NAME" => "name", "COLS" => 40, "ROWS" => 5)
# File cgi/html.rb, line 808 def textarea(name = "", cols = 70, rows = 10) # :yield: attributes = if name.kind_of?(String) { "NAME" => name, "COLS" => cols.to_s, "ROWS" => rows.to_s } else name end super(attributes) end