Error when converting java array to javascript array

Question

I attempted to convert java array to js array. but it gives error as "k cannot be resolved to a variable".x.getrows returns array.

  <% MySQLAccess x=new MySQLAccess();%>
     <% String b[]=x.getRows();%>
     var message="<%out.print(b[0]);%>"
     console.log(message)   
     var data=new Array();
         <% for(int k=0;k<b.length ;k++) %>
         <%  {%>

          var temp=<%= b[k] %>
          data[<% =k %>]=temp;    
        <%}%>   

Answer 1

@user2815407 What you are receiving in your string array? May be something like [str1,str2,str3]. If so you can easily convert this string array into js array.

var values = [];
values = //Your_string_array
//Iterate through each value
$.each(values, function( index, value ) {
   console.log(value);
});

See this fiddle. This may not be optimal way to convert java to js array. Hope this will give you some idea. Let me know if this helps.

Answer 2

I advice not to use scriplets, but here's the solution to your problem :

 <% String b[] = new String[]{"10", "20", "30"};%>
            var message = "<%out.print(b[0]);%>"
            console.log(message)
            var data = new Array();
            <% for(int k=0;k<b.length;k++){%>
            var temp =<%=b[k]%>
            data[<%=k%>] = temp;
            <%}%>

The error was just un-necessary spaces.

Answer 3

My advice to fix this code: forget about it:

• you should NEVER use scriptlets in JSPs
• JS string literals need quotes around them, and escaped quotes and other escaped special chars inside
• JSON is the tool you should use.

So, in your controller, use

request.setAttribute("jsArray", someJsonSerializer.toJson(javaArray));

And in your JSP:

var data = ${jsArray};