如何使用request.getparameter在Java控制器中获取JavaScript变量？

Question

I have a javascript variable within my JSP, I was wondering if there was a way I could pick this up in my java controller using the HTTP request.getparameter? This is so I can pass the string value I need into my hibernate method.

Answer 1

Java script is on browser side where java code is server side. You can not pass like this but you can do form-submission, or using URL parameter or using AJAX calls. Below is form-submission example:

HTML: you should wrap the hidden field insdie <form> tag

<form>
<input type="hidden" id="hiddenId" name="hiddenId"/>
</form

JavaScript:

document.getElementById("hiddenId").value=yourValue;

Then do a form submission, you will be able to get at server side using

request.getParameter("hiddenId")

Answer 2

You can send your javascript variable value with your URI like:-

http://localhost:8080/myApp?myVariable="value"

And at server side you can simply use request.getParameter("myVariable") to retrieve the value of your variable.

Answer 3

I have two approaches -
1.Using Form Submit
a)Define Form in JSP
b)Define Hidden field with name inside form
c)Set javascript variable value in html hidden fields (can be achieved using jquery on some event)
d)Submit form

2.Using Ajax call
a)create ajax request in jquery
b)set javascript variable value as params of ajax.

With both approach you can access variable using request.getParameter() at server side where controller resides.

Answer 4

 var value = gnval;
 $.ajax({
   method: "POST",
   url: "yoururl",
   data: {gnval: value}
 });

For all those curious this is how I used AJAX to do this.