Spring MVC：弹簧之间的区别：bind和form：form [英] Spring MVC: Difference between spring:bind and form:form

问题描述

我的JSP代码片段如下所示：

：

 < form：form modelAttribute =testRulesForm> 
 .... 
< td> 
< form：checkbox path =rules [$ {counter.index}]。isActivevalue =rules [$ {counter.index}]。isActive/> 
< / td> 
< td> 
< form：select path =rules [$ {counter.index}]。leftCondition.name> 
< form：options items =$ {testRulesForm.ruleAttributes}itemLabel =nameitemValue =name/> 
< / form：select> 
< / td> 
< td> 
< form：select path =rules [$ {counter.index}]。operator> 
< form：options itemLabel =operatoritemValue =operator/> 
< / form：select> 
< / td> 
 .... 
  

看到我已经指定了路径变量，到我的modelAttribute，这是否意味着我不需要spring：bind？

谢谢

解决方案

如果您已经使用 form ，通常您不需要使用< spring：bind> c> taglib。



它们在模型属性方面基本相同，但来自 form taglib的标签也会生成HTML表单标记，而使用< spring：bind> ，您需要自己生成标记。

$ p $ lt; code>< form：form modelAttribute =foo> $ c> form 标签：

< form：input path =bar/>
< / form：form>

与下面的代码类似：< spring：bind> ：

 < spring：bind path =foo> 
< form method =get> 
< spring：bind path =bar> 
< input name =barvalue =$ {status.displayValue}/> 
< / spring：bind> 
< / form> 
< / spring：bind> 
  

< spring：bind> 很有用当你需要自定义的东西时， form taglib是无法实现的。

I am looking to find out the difference between the spring:bind and form:form tag libraries when submitting a form.

A snippet of my JSP is as follows:

<form:form modelAttribute="testRulesForm">
....
<td>
    <form:checkbox path="rules[${counter.index}].isActive" value="rules[${counter.index}].isActive"/>
</td>
<td>
    <form:select path="rules[${counter.index}].leftCondition.name">
        <form:options items="${testRulesForm.ruleAttributes}" itemLabel="name" itemValue="name" />
    </form:select>
</td>
<td>
    <form:select path="rules[${counter.index}].operator">
        <form:options itemLabel="operator" itemValue="operator" />
    </form:select>
</td>
....

Seeing as I have my path variable specified and this will be bound to my modelAttribute, does this mean that I do not need spring:bind?

Thanks

解决方案

Normally you don't need to use <spring:bind> if you already use form taglib.

They do basically the same with respect to model attributes, but tags from form taglib also generate HTML form markup, whereas with <spring:bind> you need to generate markup yourself.

The following code with form tags:

<form:form modelAttribute = "foo">
    <form:input path = "bar" />
</form:form>

is similar to the following code with <spring:bind>:

<spring:bind path = "foo">
    <form method = "get">
        <spring:bind path = "bar">
            <input name = "bar" value = "${status.displayValue}" />
        </spring:bind>
    </form>
</spring:bind>

<spring:bind> is useful when you need something customized, that cannot be achieved by form taglib.

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