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POHow to handle newlines in a Struts form that relies on JavaScript
 

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  1. POHow to handle newlines in a Struts form that relies on JavaScript
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    <p>I have a Struts form which contains a Map:</p> <pre><code>private Map&lt;Long, String&gt; questionAnswers = new TreeMap&lt;Long, String&gt;(); </code></pre> <p>I have the normal getter and setter for this variable (not shown here), and I also have the getter and setter required for Struts to work (using String/Object):</p> <pre><code>public Object getQuestionAnswer(String questionId) { return getQuestionAnswers().get(questionId); } public void setQuestionAnswer(String questionId, Object answerText) { String answer = (answerText == null) ? "" : answerText.toString(); getQuestionAnswers().put(Long.valueOf(questionId), answer); } </code></pre> <p>In my JSP, I am dynamically generating the textareas that are used to enter the values for the map. This is all working fine. However, when the form is invalid, I need to dynamically generate the textareas again, and put the user text back into the textareas. I am currently repopulating the textareas like so:</p> <pre><code>&lt;c:forEach items="${myForm.questionAnswers}" var="questionAnswer"&gt; var textareaBoxName = "questionAnswer(" + '${questionAnswer.key}' + ")"; var textareaBox = document.getElementsByName(textareaBoxName)[0]; if (textareaBox) { $('textarea[name=' + textareaBoxName + ']').val('${questionAnswer.value}'); } &lt;/c:forEach&gt; </code></pre> <p>This works fine, except if you enter a newline in the textarea. Then a JavaScript error complains about an "Unterminated string constant". I am guessing the newlines are being performed instead of just read.</p> <p>In the <code>setQuestionAnswer</code> method, I put in some debugging and found that a newline entered in the textarea is being read as 2 characters, which converted into ints are 13 and 10 (which I believe are \r and \n). I tried replacing the the "\r\n" with just "\n" in the <code>setQuestionAnswer</code> method (using the String <code>replaceAll</code> method), but the same error occurred. I then tried replacing the "\r\n" with "%0A" (which I believe is the JavaScript newline). While this got rid of the JavaScript error, the textareas now have the "%0A" displayed instead of a newline. I tried all sorts of escaping and unescaping with no luck (note, I also want special characters to be preserved). </p> <p>Does anyone have any idea on how to preserve newlines and special characters in the textarea boxes on invalid submits? I need this to work in IE. And I would like to avoid anything hacky like using some special character/string to "represent" a newline which I then replace in JavaScript, etc.</p>
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