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Struts AJAX Call using JQuery

 
Greenhorn
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I have a doubt in Struts making AJAX call. I have a drop down and I want to change the value of second drop down when First drop is changed. I need help in this. I am using JQuery. I am able to make call to Action class execute method - I need help in displaying data back on user form. Could you please help me in this.
 
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It's pretty easy:

Your request just needs to return the list of option elements to inject into the dropdown
 
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