Ajax with Spring boot - ajax

Question

Sorry for asking this question as a new Question. I changed the code as instructed. but still it's not working. Please help me to solve this coding. Thanks !
<div class="label_left_2">
<label class="outputdataField2_Short">Product No</label>
</div>
<div class="input_left_2">
<input list="dropdownproduct" placeholder="Start typing..."
class="inputDataField_Select2_Short" id="dropProduct"
th:field="*{product_id}">
</div>
<datalist id="dropdownproduct">
<option value="0">select product Code</option>
<option th:each="product1 : ${listProducts}"
th:value="${product1.item_Code}" th:text="${product1.name}" />
</datalist>
Ajax Code
$( "#dropProduct" ).select(function() {
// alert( "Handler for .select() called." );
var productId= $( "#dropProduct" ).val();
// alert(' productId'+ productId);
$ajax({
url :'/findProduct2',
**data:{ "productid" : productId },**
dataType:'json',
contentType:'application/json',
success: function(result){
$(discount_Amount).html(result.discount);
}
//}
});
});
Spring Controller Code:-
#RequestMapping("/findProduct2")
ResponseEntity<Product> showProduct2(HttpServletRequest req, Model model) {
System.out.println(" in method.... ");
**String productId = req.getParameter("productId");**
ResponseEntity<Product> responseEntity = new ResponseEntity<Product>(productService.get(productId),
HttpStatus.OK);
return responseEntity;
}

Answer 1

It's probably because you forgot to specify the HTTP method both in the Ajax and Spring controller. I am assuming it's a GET request.
try this for the Ajax
$( "#dropProduct" ).select(function() {
// alert( "Handler for .select() called." );
var productId= $( "#dropProduct" ).val();
// alert(' productId'+ productId);
$ajax({
url :'/findProduct2',
**data:{ "productid" : productId },**
dataType:'json',
type: "GET",
contentType:'application/json',
success: function(result){
$(discount_Amount).html(result.discount);
}
//}
});
});
And this for the Controller
#RequestMapping("/findProduct2", method = RequestMethod.GET)
ResponseEntity<Product> showProduct2(HttpServletRequest req, Model model) {
System.out.println(" in method.... ");
**String productId = req.getParameter("productId");**
ResponseEntity<Product> responseEntity = new ResponseEntity<Product>(productService.get(productId),
HttpStatus.OK);
return responseEntity;
}