checking if Object is in a Set in the view

HI,
i have two Objects, Page and Html.
Page contains a Set of html Objects.
all is working good but now i would to have something like this:

when displaying the Page-edit-form the List of available Htmls Objects should select the Html objects that are already inside the Set of the Page Object.

one thing i tried is to use the contains function from Set with the command like:

Code:

---

  <c&#58;if test="$&#123;command.htmls.contains&#91;html&#93;&#125;">

---

but this doesn't work.

so have any one a idee or solution how to check if a List or Set contains a Object within the jsp view ?

thank you.

mfg Gideon

Instead of storing a Set of 'Html' objects, change your command model object to store a Map with key = html object and value Boolean.TRUE.

In your JSP, you can now use the JSTL test

Code:

---

<c&#58;if test="$&#123;command.htmls&#91;html&#93;&#125;">

---

JSTL does not provide a way to test if an object exists in a List/Set. If you must use a Set in your model, you'll have to write scriptlet code to test for existence of an object in the Set.

Sanjiv

HI,

ok i want to change to a map, but i have some hibernate mapping problems.

the mapping i tried is this:

Code:

---

        <class name="Page" table="pages">
                <id name="id" column="id" unsaved-value="-1">
                        <generator class="identity"/>                   
                </id>
                <property name="name" column="name"/>
                <map name="htmlsInternal" table="page_htmls">
                        <key column="page_id"/>                       
                        <index-many-to-many column="html_id" class="Html"/>                       
                        <element column="htmls" type="string"/>
                </map>
        </class>

        <class name="Html" table="htmls">
                <id name="id" column="id" unsaved-value="-1">
                        <generator class="identity"/>
                </id>
                <property name="name" column="name"/>
                <property name="code" column="code"/>
                <property name="datetime" column="datetime"/>
                <property name="active" column="active"/>
                <property name="lang" column="lang"/>
        </class>

---

but with this i get the following error:

Code:

---

javax.servlet.jsp.JspTagException: javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "test" with value "${command.htmls[html]}": The "[]" operator was supplied with an index value of type "de.starline.cms.content.Html" to be applied to a List or array, but that value cannot be converted to an integer. (null) at org.apache.taglibs.standard.tag.el.core.IfTag.condition(IfTag.java:65) at javax.servlet.jsp.jstl.core.ConditionalTagSupport.doStartTag(ConditionalTagSupport.java:122) at

---

i seems that the taglibs doesnt' use the map keys

any idea ?

Thanks

mfg Gideon

HI,

ok sorry this was my mistake, i have forgotten to change the map witch is used in the JSP view..

now i don't get any error but the fields are empty

<c:out value="${command.htmls[html]}"/>

is empty (inside the db the htmls column have a attribute true or equals.

any idea?

thank you.

mfg Gideon

Sounds like a hibernate mapping issue however I would not add a database column with true/false values just to support the JSTL expression.

Instead you could have the map with key = Html.id and value Html instance.

In your JSP, you can change the test to look like

Code:

---

<c&#58;if test="$&#123;!empty command.htmls&#91;html.id&#93;&#125;"/>

---

Hi,

Quote:

---

Originally Posted by sjivan

Instead you could have the map with key = Html.id and value Html instance.

In your JSP, you can change the test to look like

Code:

---

<c&#58;if test="$&#123;!empty command.htmls&#91;html.id&#93;&#125;"/>

---

---

this is the solution i have testet for some minutes and i works :)

thank for your help.

mfg Gideon