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webMathematica: Avoid reset the input in a menu with different options?

Posted 1 month ago
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In the below jsp file the user chooses between 3 options: A, B, C. When the menu is evaluated the output is fine, but the menu reset to the initial state. For instance: If I choose B, and evaluate the ouput is B (it is OK), but the input menu resest to A, how could I get that it stays in my last election (B)?

<%@ page language="java"  %>
<%@ taglib uri="/webMathematica-taglib" prefix="msp" %>

<html>

<form name="fest" action="test.jsp" method="post">
<body>
Select a option:  

<SELECT NAME="element" SIZE="1">
<OPTION VALUE="OptionA">A
<OPTION VALUE="OptionB">B
<OPTION VALUE="OptionC">C
</SELECT>
<br>
<br>
<msp:evaluate>
MSPBlock[$$element,$$element ]
</msp:evaluate>
<input type="submit" name="btnSubmit" value="Evaluate" > 

</body>
</html>
2 Replies

So a slightly reorganized version of your code with some less loose interpretations of valid HTML(https://www.w3schools.com/js/js_reserved.asp). So a jsp page called "Test2.jsp"

<%@ page language="java"  %>
<%@ taglib uri="/webMathematica-taglib" prefix="msp" %>
<html>
<body>
<form name="drps" action="Test2.jsp" method="post">
Select a option:  
<select name="drops" size="1">
    <option value="OptionA">A</option>
    <option value="OptionB">B</option>
    <option value="OptionC">C</option>
</select>
<br /><br />
<input type="submit" name="btnSubmit" value="Evaluate" /> 
</form>
<msp:evaluate>
MSPBlock[$$drops, $$drops]
</msp:evaluate>
</body>
</html>

The "Test2.jsp" page rendered by Tomcat/webMathematica. enter image description here

webMathematica provides internal built function HTMLSelect which may help you. So a jsp page called "Test3.jsp"

<%@ page language="java"  %>
<%@ taglib uri="/webMathematica-taglib" prefix="msp" %>
<html>
<body>
<form name="drps" action="Test3.jsp" method="post">
Select a option:
<msp:evaluate>
HTMLSelect[{"A","B","C"},{"OptionA","OptionB","OptionC"}, "drops", SelectedValues -> {$$drops}]
</msp:evaluate>
<br /><br />
<input type="submit" name="btnSubmit" value="Evaluate" /> 
</form>
<msp:evaluate>
MSPBlock[$$drops, $$drops]
</msp:evaluate>
</body>
</html>

The "Test3.jsp" page rendered by Tomcat/webMathematica. enter image description here

The above is a rudimentary example, no handling of null (nil) case. If your case is more complicated, you may want to make your own function that streams out and HTML Select.

Thanks, it is just I was looking for.

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