Regarding the problem of passing data in the background through response in Ajax (including code, detailed analysis)-JS Tutorial-php.cn

Regarding the problem of passing data in the background through response in Ajax (including code, detailed analysis)

亚连

Release： 2018-05-21 17:27:42

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This article introduces to you the problem of transmitting data in the background through response in Ajax. Friends who need it can refer to it

This is the js code:

var System = { 
  getHttpRequest: function(url, callback, options) { 
    if (url.length < 0) return; 
    var option = { 
      url: url, 
      type: "get", 
      dataType: "json", 
      cache: false, 
      timeout: 30000, 
      beforeSend: function(XHR) { 
      }, 
      complete: function(XHR, textStatus) { 
        XHR.abort(); 
      }, 
      error: function(XMLHttpRequest, textStatus, errorThrown) { 
        //alert("网络连接不通，请稍后再试！"); 
      }, 
      success: function(data) { 
        callback(data, options); 
      } 
    }; 
    if ( !! options) { 
      option = $.extend(option, options); 
    } 
    $.ajax(option); 
  } 
};

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When I want to get data through the callback function success, I directly return a json string in the background at first, and the result will be an exception. There is no method defined. Later, I checked and found that I need to pass The response.getWriter().write() method writes data, and the data can only be obtained in success. The background code is as follows:

public String getRejectReason() throws Exception{ 
    String rowId = getParameterAndPut("rowId",null,0).toString(); 
    String jsonData = ""; 
    if (StringUtils.isNotEmpty(rowId)) { 
      jsonData = newOwnerInfoService.getRejectReasonJsonData(rowId); 
    } 
    this.getResponse().setCharacterEncoding("utf-8"); 
    this.getResponse().getWriter().write(jsonData); 
    return null; 
}

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

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