Home Web Front-end JS Tutorial Analysis and solutions to the causes of failure of Jquery Ajax request file download operation

Analysis and solutions to the causes of failure of Jquery Ajax request file download operation

May 24, 2018 pm 02:55 PM
ajax jquery Download Document

jQuery is indeed a very good lightweight JS framework, which can help us quickly develop JS applications, and to a certain extent, it has changed our habit of writing JavaScript code. This article focuses on introducing Jquery Ajax request file download. Analysis and solutions to the reasons for operation failure. Friends who are interested in the analysis of the reasons for ajax request failure will learn together.

jQuery is indeed a very good lightweight JS framework that can help us quickly develop JS Application, and to a certain extent, it has changed our habit of writing JavaScript code.

Stop talking nonsense and get straight to the point. Let’s analyze the reasons for the failure first

1. Reasons for the failure

That’s because of the response Generally, the requesting browser will process the response output by the server, such as generating png, file download, etc. However, the ajax request is only a "character type" request, that is, the requested content is stored in text type. The download of the file is in binary form. Although the returned response can be read, it is only read and cannot be executed. To put it bluntly, js cannot call the download processing mechanism and program of the browser.

2. Solution

1) You can use jquery to create a form and submit it to implement file download;

var form = $("<form>");
form.attr("style","display:none");
form.attr("target","");
form.attr("method","post");
form.attr("action",rootPath + "T_academic_essay/DownloadZipFile.do");
var input1 = $("<input>");
input1.attr("type","hidden");
input1.attr("name","strZipPath");
input1.attr("value",strZipPath);
$("body").append(form);
form.append(input1);
form.submit();
form.remove();
Copy after login

2) You can directly use the a tag to achieve it File download;

Click to download

3) Use hidden iframe or new form to solve the problem.

PS: Use of AJAX request $.ajax method

Use jQuery's $.ajax method to control AJAX requests in more detail. It exerts a fine-grained level of control over AJAX requests.

$.ajax method syntax

$.ajax(options)

Parameters

options

(Object) An instance of an object whose Properties define the parameters of this operation. See table below for details.

Return value

XHR instance

optionsDetailed range value

Name

Type

Description

url

String

Requested url Address

type

String

The HTTP to be used method. Usually POST or GET. If omitted, defaults to GET

data

object

An object whose properties are passed as query parameters to requests. If it is a GET request, the data is passed as the query string; if it is a POST request, the data is passed as the request body. In both cases, it is the $.ajax() utility function that handles the encoding of the value

dataType

String

A keyword used to identify the expected The type of data that will be returned in the response. This value determines what subsequent processing (if any) is performed before the data is passed to the callback function. Valid values ​​are:

xml - the response text is parsed into an XML document, and the resulting XML DOM is passed to the callback function

html - the response text is passed to the callback function unprocessed . Any

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Python opening operation after downloading the file Python opening operation after downloading the file Apr 03, 2024 pm 03:39 PM

Python provides the following options to open downloaded files: open() function: open the file using the specified path and mode (such as 'r', 'w', 'a'). Requests library: Use its download() method to automatically assign a name and open the file directly. Pathlib library: Use write_bytes() and read_text() methods to write and read file contents.

PHP and Ajax: Building an autocomplete suggestion engine PHP and Ajax: Building an autocomplete suggestion engine Jun 02, 2024 pm 08:39 PM

Build an autocomplete suggestion engine using PHP and Ajax: Server-side script: handles Ajax requests and returns suggestions (autocomplete.php). Client script: Send Ajax request and display suggestions (autocomplete.js). Practical case: Include script in HTML page and specify search-input element identifier.

How to use PUT request method in jQuery? How to use PUT request method in jQuery? Feb 28, 2024 pm 03:12 PM

How to use PUT request method in jQuery? In jQuery, the method of sending a PUT request is similar to sending other types of requests, but you need to pay attention to some details and parameter settings. PUT requests are typically used to update resources, such as updating data in a database or updating files on the server. The following is a specific code example using the PUT request method in jQuery. First, make sure you include the jQuery library file, then you can send a PUT request via: $.ajax({u

jQuery Tips: Quickly modify the text of all a tags on the page jQuery Tips: Quickly modify the text of all a tags on the page Feb 28, 2024 pm 09:06 PM

Title: jQuery Tips: Quickly modify the text of all a tags on the page In web development, we often need to modify and operate elements on the page. When using jQuery, sometimes you need to modify the text content of all a tags in the page at once, which can save time and energy. The following will introduce how to use jQuery to quickly modify the text of all a tags on the page, and give specific code examples. First, we need to introduce the jQuery library file and ensure that the following code is introduced into the page: &lt

How to get variables from PHP method using Ajax? How to get variables from PHP method using Ajax? Mar 09, 2024 pm 05:36 PM

Using Ajax to obtain variables from PHP methods is a common scenario in web development. Through Ajax, the page can be dynamically obtained without refreshing the data. In this article, we will introduce how to use Ajax to get variables from PHP methods, and provide specific code examples. First, we need to write a PHP file to handle the Ajax request and return the required variables. Here is sample code for a simple PHP file getData.php:

Use jQuery to modify the text content of all a tags Use jQuery to modify the text content of all a tags Feb 28, 2024 pm 05:42 PM

Title: Use jQuery to modify the text content of all a tags. jQuery is a popular JavaScript library that is widely used to handle DOM operations. In web development, we often encounter the need to modify the text content of the link tag (a tag) on ​​the page. This article will explain how to use jQuery to achieve this goal, and provide specific code examples. First, we need to introduce the jQuery library into the page. Add the following code in the HTML file:

PHP vs. Ajax: Solutions for creating dynamically loaded content PHP vs. Ajax: Solutions for creating dynamically loaded content Jun 06, 2024 pm 01:12 PM

Ajax (Asynchronous JavaScript and XML) allows adding dynamic content without reloading the page. Using PHP and Ajax, you can dynamically load a product list: HTML creates a page with a container element, and the Ajax request adds the data to that element after loading it. JavaScript uses Ajax to send a request to the server through XMLHttpRequest to obtain product data in JSON format from the server. PHP uses MySQL to query product data from the database and encode it into JSON format. JavaScript parses the JSON data and displays it in the page container. Clicking the button triggers an Ajax request to load the product list.

Understand the role and application scenarios of eq in jQuery Understand the role and application scenarios of eq in jQuery Feb 28, 2024 pm 01:15 PM

jQuery is a popular JavaScript library that is widely used to handle DOM manipulation and event handling in web pages. In jQuery, the eq() method is used to select elements at a specified index position. The specific usage and application scenarios are as follows. In jQuery, the eq() method selects the element at a specified index position. Index positions start counting from 0, i.e. the index of the first element is 0, the index of the second element is 1, and so on. The syntax of the eq() method is as follows: $("s

See all articles