为什么div标记的request.getParameter为空
为什么div标记的request.getParameter为空
提问于 2013-07-10 06:17:01
在我的jsp页面中，我有一个div，如下所示，我通过一个javascript事件设置它的值。
<div id="panel">Price
<div id="field_name" name="priceval"></div>
</div>我在这里面临的问题是，我得到的价格值为null
String price = request.getParameter("priceval");
int priceval = Integer.parseInt(price);作为参考，这是我的整个jsp文件。
<html>
<style media="screen" type="text/css">
#field_name { display:inline-block; }
</style>
<head>
<title>Online Book Store</title>
<script>
function myFunction() {
var quantityvalue=document.getElementById("quan").value;
var selObj = document.getElementById('selSeaShells');
var optionselectedvalue ;
// var optionselectedtext;
for (i=0; i<selObj.options.length; i++) {
if (selObj.options[i].selected) {
optionselectedvalue = selObj.options[i].value.split(':')[0];
}
}
var finalprice = quantityvalue*optionselectedvalue;
mydiv = document.getElementById("panel");
mydiv.style.display = "block"; //to show it
document.getElementById("field_name").innerHTML = finalprice;
}
function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : event.keyCode
return !(charCode > 31 && (charCode < 48 || charCode > 57));
}
function hideDiv() {
mydiv = document.getElementById("panel");
mydiv.style.display = "none"; //to hide it
}
window.onload = function () {
hideDiv();
}
</script>
</head>
<Body Bgcolor = "wheat" onload="hideDiv()">
<center>
<h2> welcome to online shopping</h2>
<form Action = "./onlinebookstore">
select Book
<select name = "book" id="selSeaShells">
<option></option>
<option value= "100:C programming language">C programming language</option>
<option value = "200:Java programming language">Java programming language</option>
<option value = "300:Network analysis">Network analysis</option>
<option value = "400:Advaced computer Networks">Advaced computer Networks</option>
<option value ="500:Programming analysis">Programming analysis</option>
<option value = "600:Advanced data strctures">Advanced data strctures</option>
<option value = "700:Advanced java and web technologies">Advanced java and web technologies</option>
<option value = "800:Electronic devices">Electronic devices</option>
<option value = "900:Computer Graphics">Computer Graphics</option>
<option value = "1000:Microprocessors">Microprocessors</option>
<option value = "1100:Oracle">Oracle</option>
</select>
<br><br>
quantity <Input type = "text" name = "Quantity" id="quan" onkeypress="return isNumberKey(event);" onblur="myFunction()">
<br><br>
<div id="panel">Price
<div id="field_name" name="priceval"></div>
</div>
<input type = "submit" name = "s" value = "ADDItem">
<input type = "submit" name = "s" value = "Removeitem">
<input type = "submit" name = "s" value = "showitems">
<input type = "submit" value = "Logout" name = "s">
</form>
</center>
</Body>
</html>回答 3
Stack Overflow用户
发布于 2013-07-10 06:29:23
div标记不是表单提交的一部分。您可以动态创建可在提交中使用的<input>标记。有关w3标签的信息，请参阅div参考。
Stack Overflow用户
发布于 2013-07-10 06:23:18
div不是参数，参数在URL上或来自form。
Stack Overflow用户
发布于 2013-07-10 06:35:22
和其他答案一样，div不是要传递的参数...要传递计算出的价格的值，您可以使用隐藏输入，并使用带有div的javascript设置它，然后在servlet中获取它的值。
就像这样
JSP
<input type="hidden" name="price" id="price">JavaScript
document.getElementById("price").value=calculatedPrice;Servlet
price = request.getParameter("price");页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/17559264
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