HTML::tag attribute

Description

Queries, removes and changes attribute/value pairs of this HTML tag.

Syntax

HTML::tag attribute [value] <name>
HTML::tag attribute count
HTML::tag attribute exists <name>
HTML::tag attribute insert <name> <value>
HTML::tag attribute names
HTML::tag attribute remove <name>
HTML::tag attribute replace <name> <value>

HTML::tag attribute value <name>

  • Return the value of the attribute under this HTML tag.
  • Introduced: BIGIP-11.0.0

HTML::tag attribute count

  • Return the number of attributes in this HTML tag.
  • Introduced: BIGIP-11.4.0

HTML::tag attribute exists <name>

  • Return true if the HTML tag has the attribute identified by <name>
  • Introduced: BIGIP-11.0.0

HTML::tag attribute insert <name> <value>

  • Insert a string of “<name>=<value>” pair at the end of the attributes, before the closing delimiter of the tag.
  • Introduced: BIGIP-11.0.0

HTML::tag attribute names

  • Return the names of all attributes in this HTML tag.
  • Introduced: BIGIP-11.4.0

HTML::tag attribute remove <name>

  • Remove the attribute identified by <name> in this HTML tag.
  • Introduced: BIGIP-11.4.0

HTML::tag attribute replace <name> <value>

  • Replace the existing value of the attribute, identified by <name>, with <value>.
  • Introduced: BIGIP-11.0.0

Examples

Auto-submit Stock Symbol Lookup on Yahoo-Finance
  • The iRule enables HTML on the root path and disables HTML everywhere else. The HTML iRule scans the HTML document as it streams from the backend server and raises HTML_TAG_MATCHED event when seeing it encounters the FORM start tag and the FORM end tag. Specifically, the iRule looks for the form that has an attribute ID with a value “quote”. Once this form is found, the iRules remembers it and injects a piece of Javascript after the first FORM end tag.
    when HTTP_REQUEST {

set uri [HTTP::uri]

HTTP::header replace "Host" "finance.yahoo.com"

}

when HTTP_RESPONSE {

if { $uri equals "/" } {

HTML::enable

} else {

HTML::disable

}

}

when HTML_TAG_MATCHED {

log local0. "element = [HTML::tag name]"

log local0. "attribute id = [HTML::tag attribute id]"


switch [HTML::tag name] {

"form" {

if { [HTML::tag attribute "id"] equals "quote" } {

set inject_js 1

}

}

"/form" {

if { [info exists inject_js] && $inject_js == 1 } {

unset inject_js

HTML::tag append "<scr"

HTML::tag append "ipt>"

HTML::tag append "function submitForm() {"

HTML::tag append "  document.quote.s.value='FFIV';"

HTML::tag append "  document.quote.submit();"

HTML::tag append "}"

HTML::tag append "setTimeout('submitForm()', 5000);"

HTML::tag append "</script>"

}

}

}

}