Web Front-end
JS Tutorial
Simulate ajaxPrefilter and ajaxTransport processing of image in JQuery_jquery
Simulate ajaxPrefilter and ajaxTransport processing of image in JQuery_jquery
May 16, 2016 pm 03:54 PM
//////////////////////////////////////////////////////////////////
// options 是請求的選項 //
// originalOptions 值作為提供給Ajax方法未經(jīng)修改的選項，因此，沒有ajaxSettings設置中的默認值 //
// jqXHR 是請求的jqXHR對象 //
//////////////////////////////////////////////////////////////////
$.ajaxPrefilter("image", function(options, originalOptions, jqXHR) {
//通過預處理器轉(zhuǎn)化類型
if (options.test) {
options.type = 'GET'
}
//增加前綴
options.url = "http://img.mukewang.com/" + options.url
});
///////////////////////
// 請求分發(fā)器 transports //
///////////////////////
$.ajaxTransport("image", function(s) {
if (s.type === "GET" && s.async) {
var image;
return {
send: function(_, callback) {
image = new Image();
function done(status) {
if (image) {
var statusText = (status == 200) ? "success" : "error",
tmp = image;
image = image.onreadystatechange = image.onerror = image.onload = null;
callback(status, statusText, {
image: tmp
});
}
}
image.onreadystatechange = image.onload = function() {
done(200);
};
image.onerror = function() {
done(404);
};
show(s.url)
image.src = s.url;
},
abort: function() {
if (image) {
image = image.onreadystatechange = image.onerror = image.onload = null;
}
}
};
}
});
$("#test").click(function(){
//執(zhí)行一個異步的HTTP（Ajax）的請求。
var ajax = $.ajax({
test : true, //測試
url : '547d5a45000156f406000338-590-330.jpg',
dataType : 'image',
type : 'POST',
data: {
foo: ["bar1", "bar2"]
},
//這個對象用于設置Ajax相關回調(diào)函數(shù)的上下文
context: document.body,
//請求發(fā)送前的回調(diào)函數(shù)，用來修改請求發(fā)送前jqXHR
beforeSend: function(xhr) {
xhr.overrideMimeType("text/plain; charset=x-user-defined");
show('局部事件beforeSend')
},
//請求完成后回調(diào)函數(shù) (請求success 和 error之后均調(diào)用)
complete: function() {
show('局部事件complete')
},
error: function() {
show('局部事件error請求失敗時調(diào)用此函數(shù)')
},
success: function() {
show('局部事件success')
}
})
ajax.done(function() {
show('done')
}).fail(function() {
show('fail')
}).always(function() {
show('always')
})
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Detailed explanation of jQuery reference methods: Quick start guide
Feb 27, 2024 pm 06:45 PM
Detailed explanation of jQuery reference method: Quick start guide jQuery is a popular JavaScript library that is widely used in website development. It simplifies JavaScript programming and provides developers with rich functions and features. This article will introduce jQuery's reference method in detail and provide specific code examples to help readers get started quickly. Introducing jQuery First, we need to introduce the jQuery library into the HTML file. It can be introduced through a CDN link or downloaded
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
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: <
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:
How to remove the height attribute of an element with jQuery?
Feb 28, 2024 am 08:39 AM
How to remove the height attribute of an element with jQuery? In front-end development, we often encounter the need to manipulate the height attributes of elements. Sometimes, we may need to dynamically change the height of an element, and sometimes we need to remove the height attribute of an element. This article will introduce how to use jQuery to remove the height attribute of an element and provide specific code examples. Before using jQuery to operate the height attribute, we first need to understand the height attribute in CSS. The height attribute is used to set the height of an element
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
Introduction to how to add new rows to a table using jQuery
Feb 29, 2024 am 08:12 AM
jQuery is a popular JavaScript library widely used in web development. During web development, it is often necessary to dynamically add new rows to tables through JavaScript. This article will introduce how to use jQuery to add new rows to a table, and provide specific code examples. First, we need to introduce the jQuery library into the HTML page. The jQuery library can be introduced in the tag through the following code:
How to delete images from Xiaomi phones
Mar 02, 2024 pm 05:34 PM
How to delete images on Xiaomi mobile phones? You can delete images on Xiaomi mobile phones, but most users don’t know how to delete images. Next is the tutorial on how to delete images on Xiaomi mobile phones brought by the editor. Interested users can come and join us. Let's see! How to delete images on Xiaomi mobile phone 1. First open the [Album] function in Xiaomi mobile phone; 2. Then check the unnecessary pictures and click the [Delete] button in the lower right corner; 3. Then click [Album] at the top to enter the special area , select [Recycle Bin]; 4. Then directly click [Empty Recycle Bin] as shown in the figure below; 5. Finally, directly click [Permanent Delete] to complete.
