How to use STRUTS2 label Select __struts2 Label

example of the implementation of a select form 0x00 HTML code implementation Select form

First, let's take a look at how to implement the simplest select form using pure HTML code, as in the following code:

<select name= "Selectname" >
    <option value= "Chelsea" > Chelsea </option>
    <option value= "Mu" > Manchester United </option>
    ...
</select>

0x01 Struts2 Tag implements select Menu

When we implement a simple select form using the struts tag, how do we do that, the code is as follows:

<s:set var= "teamlist" value= "#{' Chelsea ': ' Chelsea ', ' mu ': ' Manchester United '} ' ></s:set> <s:select name= '"
list= " Teamlist "headerkey=" "headervalue=" Choose your favorite team ></s:select>

0x02 Use the list passed in action to generate a select menu

The Select form implemented by the above example is done using static data, but we need to use Dynamic Data to perform the display of the select form in our work, how to implement the code as follows:

Action Code:

public void Teamaction () {
    private list<team> teamlist;//The List to be displayed on the page//

    here omit the Teamlist getter method

    // The setter method for Teamlist is omitted here
}

Page code:

<s:select list= "Teamlist"  <!--the list-->
      listkey= "team_id" <!--to be displayed from the action  Listkey corresponds to the value attribute in option-->
      listvalue= "Team_name"  <!--Listkey is equivalent to the text content of each option-->
      name= " team.team_id "  <!--Select's Name property-->
      value=" Chelsea ">  <!--Select's default option, Equivalent to setting the Selected= "selected"--> in the corresponding option
</s:select>

The code above is a demo that implements the basic code for using dynamic Data to complete a select form, in which only a few basic tag attributes must be used. Let's take a look at the properties of the full select tag.

second, select tag attributes detailed 0x00 Common Properties list: Create an iterative data source for a list, required items (the list must have a value, and if there is no value, you must set Headerkey, Headervalue). If the list is a map (key, value), then the primary key of the map will be the "value" property of the option (). The value of the primary key corresponds to the text content of the option. Is the option that must be set, if it is a list or a set, then it can be specified by Listkey and ListValue. Headerkey: Sets the header primary key value for the list. Must not be a null value! "'-1 '" or "" is the correct value, "" is the wrong value. Headervalue: The header option value for the list. Listkey: A property of an element object in a list data source that gets the value of an option, corresponding to value in the Select label. ListValue: The property of the Element object in the table data source that gets the text content of the option, corresponding to option in the Select label. Name: The names of the elements. schedule (all attributes):

name	must fill	Default Value	type	Description
Emptyoption	False	False	Boolean	Whether to add an empty (–) option after the header option
Headerkey	False		Object/string	Sets the header primary key value for the list. Must not be a null value! "'-1 '" or "" is the correct value, "" is the wrong value.
Headervalue	False		Object/string	Header option value for list
Multiple	False		Object/string	Create a multiple-selection list. If the Value property specifies an array (the correct element type), then multiple options specified in the array are preselected.
Size	False		Integer	The size of the Component list box (number of elements displayed)
List	True		Object/string	Creates an iterative data source for the list. If the list is a map (key, value), then the primary key of the map will be the "value" property of the option (), and the corresponding value of the primary key is the text content of the option.
Listkey	False		Object/string	The property of the element object in the list data source to get the value of the option
ListValue	False		Object/string	The properties of the element object in the list data source that are used to get the text content of the option
Theme	False		Object/string	The theme to be used when outputting elements (theme) (not using the default)
Template	False		Object/string	The template to use when outputting elements (template) (not using the default)
CssClass	False		Object/string	Class attribute when output element
CSSStyle	False		Object/string	CSS style definition when output element (translator: is the style attribute of HTML element)
Title	False		Object/string to set HTML attributes when outputting elements title
Disabled	False		Object/string	Set HTML properties when outputting elements disabled
Label	False		Object/string	An expression that outputs a label for an element
LabelPosition	False	Left	Object/string	Not in favor of use.
LabelPosition	False		Object/string	Define the position of the element label (TOP/LEFT)
Requiredposition	False		Object/string	Defines the location of the output of the required property (left
Name	False		Object/string	The name of the element
Required	False	False	Boolean	If set to true, this field will be displayed when the label is output (note: If you use the default template, it will be labeled "*")
TabIndex	False		Object/string	Set HTML properties when outputting elements TabIndex
Value	False		Object/string	The Value property of the preset INPUT element.
OnClick	False		Object/string	Set HTML property onclick when output element
OnDblClick	False		Object/string	Set HTML properties when outputting elements ondblclick
OnMouseDown	False		Object/string	Set HTML properties when outputting elements onmousedown
OnMouseUp	False		Object/string	Set HTML properties when outputting elements onmouseup
onmouseover	False		Object/string	Set HTML properties when outputting elements onmouseover
OnMouseMove	False		Object/string	Set HTML properties when outputting elements onmousemove
onmouseout	False		Object/string	Set HTML properties when outputting elements onmouseout
onfocus	False		Object/string	Set HTML properties when outputting elements onfocus
Onblur	False		Object/string	Set HTML properties when outputting elements onblur
onkeypress	False		Object/string	To set HTML properties when outputting elements
OnKeyDown	False		Object/string	Set HTML properties when outputting elements onkeydown
OnKeyUp	False		Object/string	Set HTML properties when outputting elements onkeyup
Onselect	False		Object/string	Set HTML properties when outputting elements onselect
OnChange	False		Object/string	Set HTML properties when outputting elements onchange
ToolTip	False		String	Sets the ToolTip property of an element (note: ToolTip is a ToolTip for the toolbar)
Tooltipconfig	False		String	Setting the configuration of the ToolTip property
Id	False		Object/string	The ID is used when the element is positioned. For UI and form labels it will be used as an HTML ID attribute