The answer to error returning error and always returning error in JQuery ajax

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Enter BaiduSearchThis question, I found someone said this

　The async of Ajax in Jquery defaults to true (asynchronous request). If you want to execute another Ajax after it is executed, For an Ajax, you need to set async=false

I then processed it in ajax

async: false, and found that submitting normal data returned normal without errors.

The code is as follows

##

$.ajax({
type: "POST",
async: false,
url:urllink, 
data:data,
dataType:"html",
success:function(msg){
alert(data)
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert(XMLHttpRequest.status);
alert(XMLHttpRequest.readyState);
alert(textStatus);
},
});

One last thing to add:

Sending errors may be caused by the following two, or other programs The problem requires us to take it seriously.

1. data: "{}", if the data is empty, you must pass "{}"; otherwise, the returned data will be in xml format. And prompts parsererror.

The answer to jQuery ajax always returning error is as follows:

Today I used ajax to do asynchronous deletion and encountered a problem. ajax can request

action and execute the method successfully. But the error method keeps returning. I struggled for a long time. I also checked a lot of information. Basically it’s all kinds of attempts. I just want to switch to Ext. .

I found that some methods in action start with get. If you carefully print the return of ajax, you will definitely find that when ajax returns, it will obtain all methods starting with get in the action, including of course the methods in the action. After getting it, it is different from other get methods. you know! At this time, ajax will report a 500 error. Ajax will enter the error method when the status reaches 300.

The modification method is: very simple, modify the method starting with get in the action to something else, for example;

public String getNetBut(){ 
    bdiList=googleFlexDAO.getBuildingIpsById(araid.trim()); 
    return SUCCESS; 
  }

Change it to:

public String findNetBut(){ 
    bdiList=googleFlexDAO.getBuildingIpsById(araid.trim()); 
    return SUCCESS; 
  }

This is OK! This error is generally difficult to find, but you can still spot it if you are careful!

Okay, the answers to the error return error and error always returned in JQuery ajax are all described. I hope you all like it.

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