XMLHttpRequest intercepts requests and responses

Environment: angular Implementation: Interception of requests and adding fields to request information Intercept response and filter return value Response interception: According to the XMLHttpRequest used by angular, the original request will be transferred to another XML that will listen to the return event and send the request in another century Use get set to return […]

5.Python-Use the XMLHttpRequest object to send Ajax requests

Inscription Use the XMLHttpRequest object to send Ajax requests. The following is a simple example and operation process. Install flask module pip install flask Install the mysql.connector module pip install mysql-connector-python Write app.py file The app.py file is as follows: from flask import Flask, request, render_template import mysql.connector app = Flask(__name__) # Connect to MySQL […]

AJAX —- 3 XMLHttpRequest ◆ Promise

XMLHttpRequest Definition: XMLHttpRequest object is used for server interaction. Through XMLHttpRequest, you can request a specific URL and obtain data without refreshing the page. Relationship: Axios internally uses XMLHttpRequest to interact with the server step: 1. Create XMLHttpRequest object 2. Configure the request method and request url address 3. Listen to the loadend event and […]

Ajax_3 Ajax principle + (XMLHttpRequest + Promise) + encapsulate an axios plug-in library to realize the function.

Ajax_3 Ajax principle 01-Ajax principle-XMLHttpRequest Using XMLHttpRequest step: Create an XMLHttpRequest object Configure the request method request url URL Listen to the loadend event and accept the response result make a request Requirement: Communicate with the server using the XMLHttpRequest object Code example // 1. Create an XMLHttpRequest object const xhr = new XMLHttpRequest() // […]

Use XMLHttpRequest to realize asynchronous file download

1. Problem description I want to implement the download culture asynchronously, and the request is a post request. At first I planned to use ajax. $.ajax({ type:’post’, contentType:’application/json’, url:’http://xxx/downloadExcel’, data:{data:JSON.stringify(<%=oJsonResponse.JSONoutput()%>)}, }).success(function(data){ const blob = new Blob([data], {type: ‘application/vnd.openxmlformats- officedocument.spreadsheetml.sheet’}); const url1 = URL. createObjectURL(blob) const a = document. createElement(‘a’); a.href = url1; a.download = ‘table.xlsx’; […]

XMLHttpRequest (XHR) and fetch

XMLHttpRequest (XHR) Principle XMLHttpRequest (XHR) is a technology for asynchronous data exchange between the client and the server, which allows the browser to send an HTTP request to the server, get data and update part of the web page content without refreshing the entire page. XHR is a technology commonly used in modern web development […]

In-depth analysis of XMLHttpRequest: a powerful tool for asynchronous communication

Article directory introduce What is XMLHttpRequest? Basic usage of XMLHttpRequest 1. Create an XMLHttpRequest object 2. Configuration request 3. Send request XMLHttpRequest Attribute send readyState status statusText response responseText responseType responseURL timeout with Credentials Asynchronous and synchronous requests Request Types and Data Transfers Debug example code in conclusion Introduction In web application development, the XMLHttpRequest […]

Object AJAX – XMLHttpRequest object

The cornerstone of AJAX is the XMLHttpRequest object. 1. Create an XMLHttpRequest object 2. Define the callback function 3. Open the XMLHttpRequest object 4. Send a request to the server All modern browsers support the XMLHttpRequest object. The XMLHttpRequest object can be used to exchange data with a web server behind the scenes. This means […]

Full set of front-end asynchronous programming: xmlhttprequest > ajax > promise > async/await

Asynchronous programming The difference between synchronous and asynchronous Synchronization: Execute sequentially, send requests to the server –> the client does other operations Asynchronous: Execute separately, send a request to the server ==> perform other operations at the same time Native xmlhttprequest four steps create ajax object var a=new xmlhttprequest(); Set the data transmission method (get, […]