AJAX request, solving the problem of invalid Get request

This article mainly introduces WeChat to return to the previous page, the AJAX request in the page, the analysis and solution of the problem of invalid Get request, friends in need can refer to it, I hope it can help everyone.

Let me first analyze the cause of the problem

When I was working on a WeChat project recently, I encountered a very common situation. The demand is like this. When the user enters "My Personal Center", there will be a button to click to jump to fill in the certification information. After clicking this button, it will jump to the certification information filling page, fill in the information, and submit it successfully. When the user returns directly to the previous page. The authentication status needs to be changed to "Authenticating". At this time, you need to use an AJAX method to query the authentication status and modify the status display on the page.

At that time, the ajax method was not written according to the standard method. The default method was Get request. The front-end JS code is as follows:

window.onload = function(){ var isProfesser=$('#isProfesser').val(); var isreview=$('#isreview').val(); var userid=$('#myId').val(); if(isProfesser=='0' && isreview=='0'){ $.ajax({ url:"/isAuthenticing", data: {userid:userid}, success: function (data, textStatus, jqXHR) { if(data.result=='1'){ $('#approveadd a').html("+认证中") } }, error: function () { } }); } //getMyQusetionInfo(); }

The background controller also receives GET by default

@RequestMapping(value = "/isAuthenticing", method = RequestMethod.GET) @ResponseBody public Map isAuthenticing(@RequestParam("userid") String userid,HttpServletRequest request) throws IOException { //方法体; }

Solution

Practice has proved that using the Get method is not possible. Every time you return to the previous page, the ajax method in the page will be executed as usual, but the background controller will not be requested to request the returned value. It is also the value when the page was last loaded. The specific reason is not clear to me at the moment.

Later, with the mentality of giving it a try, I used POST request. Surprisingly, using POST request, the whole process went smoothly.

The front-end JS code is as follows:

window.onload = function(){ var isProfesser=$('#isProfesser').val(); var isreview=$('#isreview').val(); var userid=$('#myId').val(); if(isProfesser=='0' && isreview=='0'){ $.ajax({ url:"/isAuthenticing", data: {userid:userid}, type: 'POST', success: function (data, textStatus, jqXHR) { if(data.result=='1'){ $('#approveadd a').html("+认证中") } }, error: function () { } }); } //getMyQusetionInfo(); }

Back-end code:

@RequestMapping(value = "/isAuthenticing", method = RequestMethod.POST) @ResponseBody public Map isAuthenticing(@RequestParam("userid") String userid,HttpServletRequest request) throws IOException { //方法体 }

I hope it can help those who encounter the same problem as me.

Note: The red part is the modified part

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