Ajax check whether duplicate implementation code

This article mainly introduces the implementation code of Ajax verification for duplication. It is very good and has reference value. Friends in need can refer to

and post the code directly!

1. Controller layer:

@ResponseBody 
@RequestMapping("entityFindByCode") 
public String entityFindByCode(Entity bean, HttpSession httpSession, Model m,HttpServletResponse res) throws IOException{ 
  res.setContentType("text/plain; charset=UTF-8"); 
  //res.reset(); 
  //PrintWriter out = res.getWriter(); 
  String data=null; 
  @SuppressWarnings("unchecked") 
  List<Entity> list = (List<Entity>) this.service.find("beanByCode", "Entity", new Object[]{bean.getCode()}); 
  if(list.size()==0){ 
    data="YES"; 
  }else{ 
    data="NO"; 
  } 
  res.getOutputStream().write(data.getBytes()); 
  //out.print(data); 
  //out.flush(); 
  //out.close(); 
  return data; 
}

2. HTML layer:

$.ajax({ 
      url    :'entityFindByCode', 
      type   :'post', 
      dataType :'text', 
      data   :{code:$("#code").val()},//{key,value} 
      success  :function(data) { 
        if (data == "YES"){ 
          document.getElementById("msg-code").innerHTML = "(<fmt:message key=&#39;warn.field.required.unique&#39; bundle=&#39;${bundle }&#39; />)"; 
          return true; 
        } 
        else { 
          $("#p-code").addClass("has-error"); 
          document.getElementsByName("code")[0].value = "";  
          //document.getElementsByName("code")[0].setAttribute("placeholder", "<fmt:message key=&#39;warn.duplicate&#39; bundle=&#39;${bundle }&#39; />");  
          document.getElementById("msg-code").innerHTML = "(<fmt:message key=&#39;warn.duplicate&#39; bundle=&#39;${bundle }&#39; /> !!!)"; 
          return false; 
        } 
      } 
    });

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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