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    <p>If the issue is to use the built in struts2 functionality then one easy option is to render your view with freemarker, which readily supports the dynamic addition of attributes. </p> <p>If you are using conventions, it is VERY trivial you just need to create a file with a ".ftl" extension, if you are using xml it is also very easy just use the freemarker result type (see <a href="http://struts.apache.org/2.3.4.1/docs/Freemarker%20Support.html" rel="nofollow">here</a> for greater description):</p> <pre><code>&lt;action name="test" class="package.Test"&gt; &lt;result name="success" type="freemarker"&gt;/WEB-INF/content/testView.ftl&lt;/result&gt; &lt;/action&gt; </code></pre> <p>Here is example view using a map to dynamically add attributes (example also taken from liked page):</p> <pre><code>&lt;@s.textfield name="test" dynamicAttributes={"placeholder":"input","foo":"bar"}/&gt; </code></pre> <p>The dynamicAttributes would be extremely useful in all JSP UI tags but alas it is not currently implemented.</p> <p><strong>NOTE</strong>: There is one error/omission in the above link. It tells you to add the following line which causes an error in my environment (simply the line is not needed).</p> <pre><code>&lt;#assign s=JspTaglibs["/WEB-INF/struts.tld"] /&gt; </code></pre> <p>That is, this line in a file <em>all by it self</em> is sufficient for rendering a text element, no explicit tag library declaration needed!</p> <pre><code>&lt;@s.textfield name="test" dynamicAttributes={"placeholder":"input","foo":"bar"}/&gt; </code></pre> <p>There are a number of advantages to using freemarker over plain JSPs, so taking a moment to explore the syntax and using it for this one case may prove useful later. </p>
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    1. PODynamically add attribute to struts2 UI tag
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    1. USQuaternion
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    1. COFrom what I've understood you can only set the attribute's _value_, but not the _entire_ attribute dynamically. I tried approaches like `<@s.textfield dynamicAttributes={getReadOnlyAttribute()}/>` (with the custom method returning the string `\"readonly\":\"readonly\"`) and `<@s.textfield getReadOnlyAttribute()}/>` (returning the string `readonly=\"readonly\"`). Both attempts also with the $ and %{} notation. Each time, either a struts or freemarker parsing exception occurred.
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      1. USDani
    2. COYou must return a map, not a string which can be interpreted as a map.
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      1. USQuaternion
    3. COThank you. Still no success, unfortunately. Here's what I've tried: `dynamicAttributes=...` and then `%{getReadOnlyAttribute()}, {%{getReadOnlyAttribute()}}, {${getReadOnlyAttribute()}}, ${getReadOnlyAttribute()}, {${action.getReadOnlyAttribute()}}, ${action.getReadOnlyAttribute()}, {%{#action.getReadOnlyAttribute()}}, %{#action.getReadOnlyAttribute()}`; with the method returning a Map<String, Object>. However, the method is never called as Freemarker always "expected other sign". How can I call a the method to pass those attribute values?
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