JQuery $.ajax() post - data in a java servlet

Question

I want to send data to a java servlet for processing. The data will have a variable length and be in key/value pairs:

{ A1984 : 1, A9873 : 5, A1674 : 2, A87         


        

Answer 1

To get the value from the servlet from POST command, you can follow the approach as explained on this post by using request.getParameter(key) format which will return the value you want.

Answer 2

For the time being I am going a different route than I previous stated. I changed the way I am formatting the data to:

  &A2168=1&A1837=5&A8472=1&A1987=2

On the server side I am using getParameterNames() to place all the keys into an Enumerator and then iterating over the Enumerator and placing the keys and values into a HashMap. It looks something like this:

Enumeration keys = request.getParameterNames(); 
HashMap map = new HashMap(); 
String key = null; 
while(keys.hasMoreElements()){ 
      key = keys.nextElement().toString(); 
      map.put(key, request.getParameter(key)); 
}

Answer 3

You don't want a string, you really want a JS map of key value pairs. E.g., change:

 data: myDataVar.toString(),

with:

var myKeyVals = { A1984 : 1, A9873 : 5, A1674 : 2, A8724 : 1, A3574 : 3, A1165 : 5 }



var saveData = $.ajax({
      type: 'POST',
      url: "someaction.do?action=saveData",
      data: myKeyVals,
      dataType: "text",
      success: function(resultData) { alert("Save Complete") }
});
saveData.error(function() { alert("Something went wrong"); });

jQuery understands key value pairs like that, it does NOT understand a big string. It passes it simply as a string.

UPDATE: Code fixed.

Answer 4

Simple method to sending data using java script and ajex call.

First right your form like this

<form id="frm_details" method="post" name="frm_details">
<input  id="email" name="email" placeholder="Your Email id" type="text" />
    <button class="subscribe-box__btn" type="submit">Need Assistance</button>
</form> 

javascript logic target on form id #frm_details after sumbit

$(function(){
        $("#frm_details").on("submit", function(event) {
            event.preventDefault();

            var formData = {
                'email': $('input[name=email]').val() //for get email 
            };
            console.log(formData);

            $.ajax({
                url: "/tsmisc/api/subscribe-newsletter",
                type: "post",
                data: formData,
                success: function(d) {
                    alert(d);
                }
            });
        });
    }) 





General 
Request URL:https://test.abc
Request Method:POST
Status Code:200 
Remote Address:13.76.33.57:443

From Data
email:abc@invalid.ts