Js intercepts global ajax request
Have you ever had the following needs: need to add a unified signature to all ajax requests, need to count the number of times a certain interface is requested, need to limit the method of http requests to get or post, need to analyze other people's network protocols Wait, so how? Think about it, if you can intercept all ajax requests, then the problem will become very simple!
How to use
1. Directly introduce the script
-
Introduce ajaxhook.js
<script src="wendu.ajaxhook.js"></script>
Copy after login -
Intercept the required ajax callback or function.
hookAjax({ //拦截回调 onreadystatechange:function(xhr){ console.log("onreadystatechange called: %O",xhr) }, onload:function(xhr){ console.log("onload called: %O",xhr) }, //拦截函数 open:function(arg){ console.log("open called: method:%s,url:%s,async:%s",arg[0],arg[1],arg[2]) } })Copy after login
ok, we use the get method of jQuery (v3.1) to test:
// get current page source code
$.get().done(function(d){
console.log(d.substr(0,30)+"...")
})Result:
> open called: method:GET,url:http://localhost:63342/Ajax-hook/demo.html,async:true > onload called: XMLHttpRequest > <!DOCTYPE html> <html> <head l...
The interception was successful! We can also see that jQuery3.1 has abandoned onreadystatechange and used onload instead.
2. In the module building tool environment under CommonJs
Assuming that it is under webpack, the first step is to install the ajax-hook npm plug-in
npm install ajax-hook --save-dev
The second step is to introduce the module And call the api:
const ah=require("ajax-hook")
ah.hookAjax({
onreadystatechange:function(xhr){ ... },
onload:function(xhr){ ... },
...
})
...
ah.unHookAjax()API
hookAjax(ob)
ob, the type is an object, and the key is the callback or function you want to intercept. value is our interception function.
Return value: Original XMLHttpRequest. If you have a write request and don't want to be intercepted, you can use new this.
unHookAjax()
Uninstall interception; after uninstallation, interception will be invalid.
Change ajax behavior
Intercept all ajax requests, detect the request method, if it is "GET", interrupt the request and give a prompt
hookAjax({
open:function(arg){
if(arg[0]=="GET"){
console.log("Request was aborted! method must be post! ")
return true;
}
}
})Intercept all ajax requests and add timestamps to the requests
hookAjax({
open:function(arg){
arg[1]+="?timestamp="+Date.now();
}
})Modify the data "responseText" returned by the request
hookAjax({
onload:function(xhr){
//请求到的数据首部添加"hook!"
xhr.responseText="hook!"+xhr.responseText;
}
})Result:
hook!<!DOCTYPE html> <html> <h...
With these examples, I believe it was mentioned at the beginning requirements are easily fulfilled. Finally, test the output of unHook
hookAjax({
onreadystatechange:function(xhr){
console.log("onreadystatechange called: %O",xhr)
//return true
},
onload:function(xhr){
console.log("onload called")
xhr.responseText="hook"+xhr.responseText;
//return true;
},
open:function(arg){
console.log("open called: method:%s,url:%s,async:%s",arg[0],arg[1],arg[2])
arg[1]+="?hook_tag=1";
},
send:function(arg){
console.log("send called: %O",arg[0])
}
})
$.get().done(function(d){
console.log(d.substr(0,30)+"...")
//use original XMLHttpRequest
console.log("unhook")
unHookAjax()
$.get().done(function(d){
console.log(d.substr(0,10))
})
}):
open called: method:GET,url:http://localhost:63342/Ajax-hook/demo.html,async:true send called: null onload called hook<!DOCTYPE html> <html> <he... unhook <!DOCTYPE
Note
The return value of the interception function is a boolean. If it is true, the ajax request will be blocked. , the default is false, and the request will not be blocked.
The parameters of all callback interception functions are the current XMLHttpRequest instance, such as onreadystatechange, onload; all interception functions of the ajax original method will pass the original parameters to the interception function in the form of an array, You can modify this in the interceptor function.
Related recommendations:
ajax callback to open a new form to prevent the browser from intercepting effective methods
About using JavaScript to intercept the form's submit method implementation
The above is the detailed content of Js intercepts global ajax request. For more information, please follow other related articles on the PHP Chinese website!
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