Thymeleaf binding a selected value from a table - spring

Question

I'm having a table with multiple elements that are generated from a List and every table element from that list has a button.By clicking that button there is a post submit request which should bind the values from that table data element to a #ModelAttribute object in spring boot.
The problem is that i'm able to map the whole list but I want to bind only the table element where the button was pressed.
<div class="table-responsive">
<form th:action="#{/saveAd}" th:object="${object}" method="POST">
<table class="table table-sm table-hover">
<thead class="thead-dark">
<tr>
<th>Image</th>
<th>Title</th>
<!-- <th style="width: 16.66%">Link</th> -->
<th>Price</th>
<th>City</th>
</tr>
</thead>
<tbody id="myTable">
<th:block th:each="element, itemStat: *{lista}">
<tr
th:onclick="'javascript:rowClicked(\'' + *{lista[__${itemStat.index}__].url} + '\');'">
<input type="hidden" readonly="readonly"
th:name="?"
th:value="${element.getUrl()}" />
<td>
<input type="hidden" readonly="readonly" th:name="img" th:value="${element.getImg()}" />
<img th:src="*{lista[__${itemStat.index}__].img}" class="size" name="img" />
</td>
<td>
<input type="hidden" readonly="readonly" th:name="?" th:value="${element.getTitle()}" />
<span th:text="*{lista[__${itemStat.index}__].title}"></span>
</td>
<td>
<input type="hidden" readonly="readonly" th:name="?" th:value="${element.getPrice()}" />
<span th:text="*{lista[__${itemStat.index}__].price}"></span>
</td>
<td>
<input type="hidden" readonly="readonly" th:name="?" th:value="${element.getCity()}" />
<span th:text="*{lista[__${itemStat.index}__].city}"></span>
</td>
<td><input class="btn btn-danger" type="submit"
value="Save"></td>
</tr>
</th:block>
</tbody>
</table>
</form>
</div>
The Controller:
#RequestMapping(path = "/saveAd", method = RequestMethod.POST)
public String saveAd(#ModelAttribute("Value") ListCreationAutovitDto listCreationAutovitDto) {
return "home";
}
I have a hidden input type for every td which should map the values but i've tried naming it in different ways but i can't make it work.Are there any ways to bind only the values where the button was pressed?

Answer 1

Idea 1: Make each td contain a form pointing to your controller method. Then bind the values you want to pass to the model by using hidden input fields in the form. Each button would then do a submit for the form it is in.
Idea 2: If you're mapping json to your java objects in your app, you can construct the json request body in JavaScript to contain only the stuff you want for that request