如何将html：options集合转换为html：optionsCollection

Question

how to convert the statement of

    <html:options collection='catList' property='catId' labelProperty='catName'>        

by using <html:optionsCollection>.

Answer 1

From the documentation on the <html:options> tag, the collections attribute is ( http://people.apache.org/~germuska/struts-taglib/docs/tlddoc/html/options.html ):

Name of the JSP bean (in some scope) which is itself a Collection of other beans, each of which has properties named by the "property" and "labelProperty" attributes that are used to retrieve the value and label for each option, respectively.

So your catList is a collection of beans (that can be in any scope) that have the property catId which will be the value for the select and catName which will be the displayed label in the select.

To translate this to <html:optionsCollection> tag, We should look at the documentation ( http://people.apache.org/~germuska/struts-taglib/docs/tlddoc/html/optionsCollection.html ) :

This tag differs from the <html:options> tag in that it makes more consistent use of the name and property attributes, and allows the collection to be more easily obtained from the enclosing form bean.

So essentially its using different attributes for the same things to make the wording more consistent. In this case it should look something like:

<html:optionsCollection property="catList" value="catId" label="catName">

This will get the collection catList from the bean that is on the current form and use the catId in each of those objects as the value and catName as the label.