Snippets as Struts taglibrary attribute

Author: Kasper B. Graversen, 14/05/07
Keywords: Struts, Struts Attributes, Scriptlets, Struts Dynamic attributes.
Abstract: Struts does not allow you to mix text and scriptlets in most attributes. This guide shows you how to make "dynamic attributes".
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Snippets as Struts taglibrary attribute

Often when you are combining presentation of collections of data with javascript, you may wish to take actions on the individual line in that collection. While in the below code Struts allows you to set the styleId attribute with a mix of text and scriptlet, it does not for the onchange attribute. Whatever is inside the onchange attribute (and many other) are simply not evaluated by the JSP engine and hence you'll have useless HTML such as <input type="text" onchange="<%=row%>" ... />. Such HTML could be produced by code such as below:

Solution


<logic:iterate indexId="row" ...
<html:text styleId='<%="quantity_" + row%>' onchange="updateRow(<%=row%>)" indexed="true" ...   />   // ILLEGAL CODE!!
...
Fortunately, there is a hack around it which is to have only a scriptlet as the value for the onchange attribute. 

<logic:iterate indexId="row" ...
<% String hack = "updateRow('"+row+"');"; %>
<html:text styleId='<%="quantity_" + row%>' onchange="<%=hack%>" ...  />
...



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