Ajax-hook

中文文档:http://www.jianshu.com/p/9b634f1c9615

原理解析:http://www.jianshu.com/p/7337ac624b8e

Introduction

Hook Javascript global XMLHttpRequest object。 And change the default Ajax request and response .

Usage

Installing

Using cdn

<script src="https://unpkg.com/ajax-hook/dist/ajaxhook.min.js"></script>

Using npm
```
npm install ajax-hook
```

hook the callbacks and functions you want .

hookAjax({
  //hook callbacks
  onreadystatechange:function(xhr){
    console.log("onreadystatechange called: %O",xhr)
  },
  onload:function(xhr){
    console.log("onload called: %O",xhr)
  },
  //hook function
  open:function(arg,xhr){
    console.log("open called: method:%s,url:%s,async:%s",arg[0],arg[1],arg[2])
  }
})

// NPM
// const ah=require("ajax-hook")
// ah.hookAjax({...})

Now, it worked! we use jQuery ajax to test .

// get current page source code 
$.get().done(function(d){
    console.log(d.substr(0,30)+"...")
})

The result :

> open called: method:GET,url:http://localhost:63342/Ajax-hook/demo.html,async:true
> onload called: XMLHttpRequest
> <!DOCTYPE html>
  <html>
  <head l...

See the demo "demo.html" for more details.

API

hookAjax(ob)

ob; type is Object
return value: original XMLHttpRequest

unHookAjax()

unhook Ajax

Changing the default Ajax behavior

The return value type of all hook-functions is boolean, if true, the ajax will be interrupted ,false or undefined are not . for example:

hookAjax({
  open:function(arg,xhr){
    if(arg[0]=="GET"){
      console.log("Request was aborted! method must be post! ")
      return true;
    }
  } 
 })

Changing the "responseText"

hookAjax({
   onload:function(xhr){
    console.log("onload called: %O",xhr)
    xhr.responseText="hook!"+xhr.responseText;
   }
 })

Result:

hook!<!DOCTYPE html>
<html>
<h...

Notice

All callbacks such as onreadystatechange、onload and son on, the first argument is current XMLHttpRequest instance. All functions, such as open, send and so on, the first parameter is an array of the original parameters, the second parameter is the current origin XMLHttpRequest instance.

leonhu0710/Ajax-hook