我在网上冲浪，有很多php和ajax代码，问题是我对php，ajax和ccs并不是很熟悉......我真的需要尽快做到这一点。
尝试使用这个，但没有真正发生
<script>
$(document).ready(function () {
$("#refresh").on("click", function () {
$("#center").load("center.html");
});
});
</script>
这是我想首先加载的唯一部分......
<div id="refresh" align="center">
<% ArrayList<PurchaseOrder> PurchaseOrder = (ArrayList<PurchaseOrder>) session.getAttribute("poList");
%>
<select name="selected" >
<%
for (int i = 0; i < PurchaseOrder.size(); i++) {
%>
<option value="<%=PurchaseOrder.get(i).getPoNumber()%>"> <%=PurchaseOrder.get(i).getPoNumber()%></option>
<%
}
%>
</select>
</div>
然后通过选择属性＆＃34;来加载这部分＆＃34;在dropdwon
<form method="POST" action="ConsumptionReportServlet">
<div id ="center" align="center">
<%
int y = Integer.parseInt(request.getParameter("value"));
%>
<table id="dataTable" class="table table-hover" style= "width:800px">
<tr>
<th class = "edits">Purchase Order</th>
<th class = "edits">Item Description</th>
<th class = "edits">Quantity</th>
<th class = "edits">Unit Measurement</th>
<th class = "edits">Unit Price</th>
<th class = "edits">Vat</th>
<th class = "edits">Date Made</th>
<th class = "edits">Prepared By</th>
<th class = "edits">Approved By</th>
</tr>
<tr>
<td><%=PurchaseOrder.get(y).getPoNumber()%></td>
<td><%= PurchaseOrder.get(y).getItemDescription()%></td>
<td><%= PurchaseOrder.get(y).getQty()%></td>
<td><%= PurchaseOrder.get(y).getUnitMeasurement()%></td>
<td><%= PurchaseOrder.get(y).getUnitprice()%></td>
<td><%= PurchaseOrder.get(y).getVat()%></td>
<td><%= PurchaseOrder.get(y).getDateMade()%></td>
<td><%= PurchaseOrder.get(y).getPreparedBy()%></td>
</tr>
</table>....
问题是，所有的scriplets代码同时加载？
错误消息，我认为此错误是由于此
<%
int y = Integer.parseInt(request.getParameter("value"));
%>
因为它被加载...当没有＆＃34;设置值＆＃34;然而..
> HTTP Status 500 - Internal Server Error
>
> type Exception report
>
> messageInternal Server Error
>
> descriptionThe server encountered an internal error that prevented it
> from fulfilling this request.
>
> exception
>
> org.apache.jasper.JasperException: java.lang.NumberFormatException:
> null root cause
>
> java.lang.NumberFormatException: null note The full stack traces of
> the exception and its root causes are available in the GlassFish
> Server Open Source Edition 4.1 logs.
>
> GlassFish Server Open Source Edition 4.1
console error / glassfish
> > Warning: StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception java.lang.NumberFormatException: null at
> java.lang.Integer.parseInt(Integer.java:542) at
> java.lang.Integer.parseInt(Integer.java:615) at
> org.apache.jsp.EncodeDeliveryReceipt_jsp._jspService(EncodeDeliveryReceipt_jsp.java:125)
> at
> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at
> org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
> at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
> at
> org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
> at
> com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
> at
> com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
> at
> org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
> at
> org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
> at
> org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
> at
> org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
> at
> org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
> at
> org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
> at
> org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
> at
> org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
> at
> org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
> at
> org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
> at
> org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
> at
> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
> at
> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
> at
> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
> at
> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
> at
> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
> at java.lang.Thread.run(Thread.java:745)