在春天從組合框中獲取價值

Question

我很努力地找到一種方法來在Spring中接收選定的組合框值。

這是HTML形式：

<form method="post" multiple="true"> 
    Authhor: <label th:text="*{ownerName}" /><br /> 
    Title: <label th:text="*{name}" /><br /> 
    Description: <label th:text="*{description}" /><br /> 
    Price: €<label th:text="*{price}" /><br /> 
    Product: <select th:field="${productss}" th:remove="all-but-first"> 
     <option th:each="product : ${productss}" 
       th:value="${product.id}" th:text="${product.name + ' (+ €' + product.price + ')'}">Productname</option> 
    </select><br /> 
    <img width="250" heigth="250" th:src="*{plainURL}"/><br /> 
    <button align="right" class="btn" type="submit" name="add" ><span class="glyphicon glyphicon-check">Add to shopping cart</span></button><br /> 
</form> 

按鈕被點擊後，此基法在控制器執行：

@RequestMapping(value = IMAGE_ID, method = RequestMethod.POST, params = {"add"}) 
public String add(@PathVariable("id") int id, HttpSession session, Model model) { 

... 

return "redirect:/cart"; 
} 

如何從在組合框接收所選擇的值方法？這樣

Answer 1

更改您的選擇元素：

<select th:field="${productss}" th:remove="all-but-first" name="product" > 
     <option th:each="product : ${productss}" 
       th:value="${product.id}" th:text="${product.name + ' (+ €' + product.price + ')'}">Productname</option> 
    </select><br /> 

並添加控制器@RequestParam：

@RequestMapping(value = IMAGE_ID, method = RequestMethod.POST, params = {"add"}) 
public String add(@PathVariable("id") int id,@RequestParam Integer product, HttpSession session, Model model) { 

... 

return "redirect:/cart"; 
}