Re: How to process string value after 'el' processing

From:

"Daniel Pitts" <googlegroupie@coloraura.com>

Newsgroups:

comp.lang.java.programmer

Date:

3 Jan 2007 13:39:37 -0800

Message-ID:

<1167860377.042676.141080@v33g2000cwv.googlegroups.com>

Berlin Brown wrote:

I have a jsp jstl question. It is actually kind of simple, but I still
couldnt get an answer. And it is more of a design question.

How do you do 'processing' or manipulation of a string value 'after' it
has been processed through 'el' jstl?

"I am having trouble doing basic view manipulation on data output from
the expression language. I dont 'think' I need custom tags for this,
and dont think this logic should occur at the controller or model? But
for example, if I want to modify a value before it is display to the
user but after it has been evaluated: Ie."

This is my current approach.
Would it have been more logical to place:

"<jsp:useBean id="concatValue"
class="org.spirit.servlet.bean.BotListConcatValue" />
<jsp:setProperty name="concatValue" property="maxLen" value="20" />"

Within the 'forEach' bracket?

Logic in the bean:

    public String getWord() {
        if (word != null && (word.length() > (maxLen + 3))) {
            word = word.substring(0, (maxLen - 1)) + "...";
        }
        return word;
    }

<jsp:useBean id="concatValue"
class="org.spirit.servlet.bean.BotListConcatValue" />
<jsp:setProperty name="concatValue" property="maxLen" value="20" />
<c:forEach items="${linklistings}"
   var="listing" varStatus="status">
<c:set target="${concatValue}" property="word"
value="${listing.urlTitle}"/>
<c:out value="${concatValue.word}" />
</c:forEach>

You don't NEED a special tag for this, but I would probably implement
it that way. Or make it a el function. Either way, adding it the the
TLD is the right approach, instead of using the bean the way you do.

I agree, it doesn't really belong in the controller or the model, as it
is specific to the rendering (i.e., view) of the data.

Creating a TLD isn't too hard, and it is very easy to add an el
function (you can basically use a static function).

public static String trim(String word) {
    if (word != null && (word.length() > (maxLen + 3))) {
        word = word.substring(0, (maxLen - 1)) + "...";
    return word;
}

and use ${mytld:trim(listing.urlTitle)} to display it.

Hope this helps,
Daniel.