How does Ajax pass data in the background through response? (with code)

This time I will show you how Ajax transmits data in the background through response? (Code attached), what are theprecautionsfor Ajax to transfer data in the background through response? Here is a practical case, let’s take a look.

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); } };

When I want to get data through thecallback functionsuccess, at first I return a jsoncharacter directly in the background String, the result will be an exception, and there is no defined method or anything. After checking, I need to write data through the response.getWriter().write() method, and then the data can 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; }

Summary

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

Recommended reading:

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