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Ajax check whether data is duplicated

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Release: 2018-04-02 13:43:09
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This time I will bring you whether the Ajax verification data is duplicated and whether the Ajax verification data is duplicated. What are the precautions?The following is a practical case, let's take a look.

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; 
}
Copy after login

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; 
        } 
      } 
    });
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I believe you have mastered it after reading the case in this article For more exciting methods, please pay attention to other related articles on the php Chinese website!

Recommended reading:

How to use ajax to realize pop-up login

Ajax steps to delete data and view data operations Detailed explanation

The above is the detailed content of Ajax check whether data is duplicated. For more information, please follow other related articles on the PHP Chinese website!

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