Tips for avoiding problems with quoting and using apostrophes in a JavaScript function inside a tag in a JSP file

Within my JSP, I have a string value stored in ${state.status.code} that I need to pass to a JavaScript function when a table element is clicked using onClick to trigger the showStatus function. Here is how I have attempted to achieve this:

<c:set var="statusString" value="${state.status.code}" />
<td id="${rowId}"><a href="#" 
                   class="pClass" 
                   onClick="showStatus('${statusString}')>
                   Here be status
                  </a>

The issue I am facing is that the statusString may contain characters like double quotes or apostrophes, and I am struggling to escape them properly. I have experimented with different approaches within the c:set tag, such as using fn:replace with ' and ", StringEscapeUtils.escapeJavaScript(statusString), and fn:escapeXml(statusString). While one of these methods may work, I believe I may not have implemented it correctly, enclosed it in the wrong characters, or not handled it correctly.

One workaround I thought of is replacing these characters with a unique string like "!#$#!" and then substituting them back when displaying the HTML popup in the showStatus function. However, this solution seems unnecessarily complex for what should be a simple problem. Is there a better way to handle this issue?

Answer №1

If you're looking to implement this, consider the following steps:

Start by including this dependency:

<dependency>
    <groupId>org.owasp.esapi</groupId>
    <artifactId>esapi</artifactId>
    <version>2.1.0.1</version>
</dependency>

Then, make sure to pass the parameter to your javascript function like this:

onclick="showStatus('<c:out value="${esapi:encodeForJavaScript(statusString)}" />')"

To use the esapi tag, you'll need to add the following in your jsp:

<%@ taglib uri="http://www.owasp.org/index.php/Category:OWASP_Enterprise_Security_API"prefix="esapi" %>

If the esapi.tld file is missing in the META-INF dir, refer to the first answer in this link for the necessary steps: https://code.google.com/p/owasp-esapi-java/issues/detail?id=237

Follow these instructions in order to successfully implement it.

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