我有一个隐藏字段的形式,其值是由javascript设置的。我已经确认值确实被设置了。但是,当我尝试将它发送给servlet时,它产生一个空值。我使用POST方法和"提交"按钮向servlet提交。用户在"qtyText"文本框中输入。在JS中,它的值是动态设置的。为什么它不会被发送到servlet?JS
function(calculateTotalPrice(txtbxvalue, price)
{
myForm = document.forms[0];
var txtBx = myForm.elements['qtyText'];
var txtBxHidden = myForm.elements['qtyTextHidden'];
for(var i = 0; i < txtBx.length; i++)
{
var curTxtBx = txtBx[i].value;
var txtBxHiddenBx = txtBxHidden[i];
txtBxHiddenBx.value = curTxtBx;
}
}
HTML <table>
<c:forEach items="${ListInServlet}" var= "exBean">
<form name = "tableForm" method = "post" action= "/rpsapp/someservlet">
<input type="hidden" name="productId" value= "<c:out Value
= "${exBean.productId}"/>" />
<input type="hidden" value = "somevalue" name="qtyTextHidden"/>
<input name = "qtyText" type = "textbox" size = "2" value = "" onChange
= "calculateTotalPrice(this, '${exBean.price}')"/>
</c:forEach>
</form>
</table>
你必须创建和产品一样多的隐藏变量。
<form name = "tableForm" method = "post" action= "/rpsapp/someservlet">
<c:forEach items="${ListInServlet}" var= "exBean">
<input type="hidden" name="productId${exBean.productId}" value= "<c:out Value
= "${exBean.productId}"/>" />
<input type="hidden" value = "somevalue" name="qtyTextHidden${exBean.productId}"/>
<input name = "qtyText${exBean.productId}" type = "textbox" size = "2" value = "" onChange
= "calculateTotalPrice(this, '${exBean.price}')"/>
</c:forEach>
</form>
您的foreach语句(标签)与form标签重叠
你需要有这样的格式:
<c:forEach ...> <form ...> ... </form> </c:forEach>