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Understand this in JavaScript
In JavaScript, this is always pointing to the owner of a function or a method. Function Let's check out function first. function introduce() { alert("Hello, I am Laruence\r\n"); } For this function, what does this point to? In JavaScript, a global function's owner is the current page, i.e, the window object. Because its a method of the window object if we define a global function. Now you should know the this will point to the window object in the above function. ...
JavaScript,this,event,call 2013-04-03 04:10:03
File upload once again
File upload is one of the oldest operation of web design. After 20 years, it's still has no big change, difficult to handle, lack of interaction and poor user experience. Web developers have thought many methods to improve the experience of uploading file in web apps, they developed various plugins based on different JavaScript libraries. However, because of the difference among different web browsers, there is no common interface which makes these plugins work properly or easily on all web brow...
Web design, File upload, Asynchronous,HTML5 2012-09-02 11:52:21
JavaScript to scroll element into view
In AJAX applications, there are frequent needs to scroll some element into view after some modification to the page. For example, after adding an item or updating an element in an admin panel, the page may need to be scrolled to the item added or updated so that we can see the changes immediately. In these cases, JavaScript can be used to scroll the element we want to show. In Vanilla JavaScript, there is no built-in function which can achieve scroll_element_into_view(), but most of modern brows...
JAVASCRIPT,JQUERY,SCROLLTO,HOW-TO 2015-12-17 03:47:32
Understand Virtual DOM
With the popularity of React, the internals and implementation of Virtual DOM has becoming top discussed topic in tech communities and interviews. This post will give an introduction of Virtual DOM and how to implement a simple Virtual DOM logic. How to understand Virtual DOM In early days, front end developers would update a webpage view based on the data status change(usually after making AJAX call). But it brings performance penalties when there is frequent update as it would cause page reflo...
JAVASCRIPT,DOM,VIRTUAL DOM 2019-12-07 23:43:04
Convert printed document into electronic document
é¦–å…ˆä½ å¾—å…ˆæŠŠè¿™äº›æ‰“å°ç¨¿æˆ–文件通过扫æ仪扫到电脑上去,一般å•ä½éƒ½æœ‰æ‰«æ仪,如果没有也没关系,用数ç 相机æ‹ä¹Ÿè¡Œï¼Œæ‹æˆå›¾ç‰‡æ”¾åˆ°WORD里é¢åŽ»ï¼Œä¸è¿‡åœ¨äº› 之å‰ï¼Œä½ 还得装...
Printed document,Electronic document,Con 2011-07-23 23:19:42
Load html content properly in iframe
When loading content in an ifrasme, there are normally two ways: loading with src or creating iframe dynamically and set content dynamically. In this post, we will talk about how to properly load content in a dynamically created iframe element, especially on how to fix some issue we faced while in Firefox. To create an iframe dynamically, we would normally use JavaScript and with below piece of cod: let iframe = document.createElement("ifrasme"); iframe.innerHTML = "this is some text"; document...
Canonicalize XML in Java
XML canonicalization is often used when there is need to create digital signature to be sent to peers for verification. Since digital signature is created based on XML data, the XML data has to be canonicalized before its signature value can be calculated. Even an extra space may affect the signature value calculated, hence it must follow some rules to canonicalize the XML data so that it has a standard format. This is why W3C created specification Canonical XML Version 1.1. This specificat...
JAVA,XML,JAVA SECURITY 2016-01-20 01:39:45
HTTP Server development resource summary
This article summarizes some materials, articles and books I used when learning HTTP Server development. Hope this will help you. RFC and standard documents RFC2616 – Hypertext Transfer Protocol — HTTP/1.1 HTTP protocol standard document, it's an essential reference document for all personnel engaged in the development of the HTTP-related projects, careful study is recommended. RFC793 – TRANSMISSION CONTROL PROTOCOL TCP Protocol standard document The WWW Common Gateway Interfac...
HTTP Server,Book,Article 2012-09-25 22:46:56
XML Abuse
It’s everywhere. XML Abuse. From Domain Specific Languages to Data Serialization, XML is the most commonly abused data format I’ve ever encountered. XML is perfectly fine for (because it was designed for this): First of all: XML was designed to be written by humans and read by humans. Nearly all generated XML I’ve seen sucks badly. I think this is because XML cannot efficiently represent common data structures found in programming languages.XML is good...
XML,Abuse,Alternative,Serialization,Data storage 2011-12-14 07:12:10
Using JavaScript to operate clipboard
Browsers allow JavaScript to read and write data on clipboard. Generally script should not modify user's clipboard to avoid impacting user expectation, but there are cases where this can indeed bring convenience to users. For example, for some code snippet, user can copy it to clipboard with one click instead of select and copy manually. There are three options for clipboard operation provided in JavaScript/browser: document.execCommand() Asynchronous Clipboard API copy and paste events This p...
JAVASCRIPT,CLIPBOARD,NAVIGATOR.CLIPBOARD 2021-01-23 23:23:34
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