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---+ Package =TWiki::Form::FieldDefinition= Base class of all field definition classes. Type-specific classes are derived from this class to define specific per-type behaviours. This class also provides default behaviours for when a specific type cannot be loaded. %TOC% ---++ ClassMethod *new* <tt>(%...)</tt> Construct a new FieldDefinition. Parameters are passed in a hash. See Form.pm for how it is called. Subclasses should pass @_ on to this class. ---++ ObjectMethod *finish* <tt>()</tt> Break circular references. ---++ isEditable() -> $boolean Is the field type editable? Labels aren't, for example. Subclasses may need to redefine this. ---++ isMultiValued() -> $boolean Is the field type multi-valued (i.e. does it store multiple values)? Subclasses may need to redefine this. ---++ isTextMergeable() -> $boolean Is this field type mergeable using a conventional text merge? ---++ isMandatory() -> $boolean Is this field mandatory (required)? ---++ renderForEdit( $web, $topic, $value ) -> ($col0html, $col1html) =$web= - the web containing the topic being edited =$topic= - the topic being edited Render the field for editing. Returns two chunks of HTML; the =$col0html= is appended to the HTML for the first column in the form table, and the =$col1html= is used as the content of the second column. ---++ cssClasses(@classes) -> $classes Construct a list of the CSS classes for the form field. Adds additional class specifiers related to the attributes of the field e.g mandatory. Pass it a list of the other classnames you want on the field. ---++ getDefaultValue() -> $value Try and get a sensible default value for the field from the values stored in the form definition. The result should be a value string. Some subclasses may not support the definition of defaults in the form definition. In that case this method should return =undef=. ---++ renderHidden($meta) -> $html Render the form in =$meta= as a set of hidden fields. ---++ populateMetaDataFromQuery( $query, $meta, $old ) -> ($bValid, $bPresent) Given a CGI =$query=, a =$meta= object, and an array of =$old= field entries, then populate the $meta with a row for this field definition, taking the content from the query if it's there, otherwise from $old or failing that, from the default defined for the type. Refuses to update mandatory fields that have an empty value. Return $bValid true if the value in $meta was updated (either from the query or from a default in the form. Return $bPresent true if a value was present in the query (even it was undef) ---++ ObjectMethod *renderForDisplay* <tt>($format,$value,$attrs) -> $html</tt> Render the field for display, under the control of $attrs. The following vars in $format are expanded: $title - title of the form field $value - expanded to the *protected* value of the form field The value is protected by TWiki::Render::protectFormFieldValue. ---++ ObjectMethod *attributesAsText* <tt>() -> $text</tt> Returns field attribute parameters as text, format: key1="value1" key2=value2"
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Topic revision: r2 - 2015-11-29
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