如何从JavaScript向Servlet发送请求? [英] How can I send a request from JavaScript to a servlet?

问题描述

我有一个带JavaScript的.jsp文件.

I have a .jsp file with JavaScript.

如果单击确定"按钮，则会调用JavaScript方法.此方法检测ID.

If I click to the OK button, I call a JavaScript method. This method detects an id.

我想将此ID发送到我的servlet.在我的servlet中，我想使用getParameter(id)获取ID.

I want to send this id to my servlet. In my servlet I want to get the id with getParameter(id).

我已经在本地计算机上实现了此功能，并且运行良好.如果我在服务器上部署源代码，则将调用JavaScript方法并检测到ID，但是该方法不会向我的Servlet发送请求.

I have implemented this on my local machine, and it functions well. If I deploy my source code on the sever, the JavaScript method will be called and the id will be detected, but the method doesn't send a request to my servlet.

   <script language="text/javascript">


        function removeLink(){   
            var  id=''; 
            var tmpcounter=0;
            var check=0;
            for (var counter = 0; counter < (document.getElementsByName("inProject[]").length); counter++) {
                if (document.getElementsByName("inProject[]")[counter].checked) {   
                    tmpcounter = tmpcounter+1;
                 }
            }


          for (var zaehler = 0; zaehler < (document.getElementsByName("inProject[]").length); zaehler++) {
            if (document.getElementsByName("inProject[]")[zaehler].checked) {
                check++;
                if((check == tmpcounter) || (tmpcounter==1)){
                    id += 'id='+ document.getElementsByName("inProject[]")[zaehler].value;
                }else{
                    id += 'id='+ document.getElementsByName("inProject[]")[zaehler].value +' OR ';
                }

             }

          }
                    alert(id);
                    location.href='<%=request.getContextPath()%>/issues?action=uploaddeletelink&wherestatement=' + id;   

                    close();


        }

        //-->
    </script>

这是我的确定"按钮:

<td align='right'><a class='funktion' href='javascript:removeLink();'>OK<IMG src="<%=request.getContextPath()%>/issuedb/system/layout/funktionpfeil.gif" width="14" height="9" border="0"></a></td>

在我的服务器上，该函数将被调用，并且ID将被检测到.下面的代码行将请求发送到我的servlet，但是无法正常工作.

On my server, the function will be called, and the id will be detected. The line of code below, which sends the request to my servlet, doesn't function however.

location.href='<%=request.getContextPath()%>/issues?action=uploaddeletelink&wherestatement=' + id;

推荐答案

为此目的使用Jquery ajax，这很简单方便.您需要做的就是使用jquery插件.

Use Jquery ajax for this purpose, this is simple and handy. All you need to do is use jquery plugin.

function removeLink(){   
     $.ajax({
     url: "<%=request.getContextPath()%>/issues?action=uploaddeletelink&wherestatement="+id,              
     type: "POST", 
     success: function(data){
      //If you want to return anything in jsp.
       } 
     });
 }

希望这会有所帮助.

这篇关于如何从JavaScript向Servlet发送请求?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！