javascript getelementsbyclassname

Summary of JavaScript objects, javascript objects Summary of Javascript objects: JavaScript objects can be seen as unordered sets of attributes. Each attribute is a key-Value Pair and can be added or deleted. All things in JavaScript are objects: strings, numbers, arrays, da

) There are also methods that can be used to create new nodes, add nodes to the tree, or remove nodes from the treeCreateElement ()createTextNode ()AppendChild ()RemoveChild ()3. accessing or updating property values(1) you can obtain or update the class and ID attributes through themClassname/id(2) The first is used to check whether a property exists, the second is used to get the property value, the third is used to update the property value, and the fourth is used to remove the property v

Javascript-dom LearningDOM document (HTML) object ModleDocument object (Dom core object)What can dom be used for?The style of the HTML element (color, size, position, and so on), content, genusDynamic change and operation.Document Object? First, the attribute? Title Returns or sets the caption of the current document? Method:? getElementById (idname) returns the index of the (first) object with the specified ID.Use? getElementsByTagName (tagname) retu

Let's take a screenshot first. The mouse moves to the corresponding classification, the following red small triangle will automatically follow, slow to follow. No matter how many are available. JavaScript code: Copy Code code as follows: function Changecoord (ID, left) { $$ (id). Style.left = left; } function $$ (ID) { return document.getElementById (ID); } function $$$ (ID) { return Document.getelementsbyclassname (ID) [0]; }

The setTimeout and setInterval of JavaScript are two methods that can easily fool others' feelings, because we often start to think that the call will be executed in the established way. I think many people share the same feeling. For example The Code is as follows: SetTimeout (function (){Alert ('Hello! ');}, 0 );SetInterval (callbackfunctions, 100 ); It is assumed that the greeting method in setTimeout will be executed immediately, because it is

1. What is JavaScript? Javascript is a scripting language based on object and event-driven with secure performance. It is used to link multiple objects on a web page with HTML hypertext markup language and Java scripting language (Java applet) to interact with Web customers, this allows you to develop client applications. It is implemented through embedding or calling in a standard HTML language. Its appea

Today we are excited to release the early adopters of Flow, a new Javascript static type checker. Flow adds a static type check for Javascript to improve development efficiency and code quality. This article will share with you a new Javascript static type check tool in Flow, if you are interested, let's learn about it. Today we are excited to release the early a

This article mainly introduces the scope and context of Javascript. this article describes the scope VS context, variable scope, "this" context, execution context (ExecutionContext), and scope chain, for more information, see Overview The implementation of scopes and context in Javascript is unique to the Javascript language. To some extent,

Many readers think that I have been reading the essence of JavaScript language and programming practices, so I have always wanted to write a simple reader. Simply put, this is the simplest one. Many readers think that I have been reading the essence of JavaScript language and programming practices, so I have always wanted to write a simple reader. Simply put, this is the simplest one. There is an article n

This article mainly introduces the scope and context of Javascript. this article describes the scope VS context, variable scope, "this" context, execution context (ExecutionContext), and scope chain, for more information, see Overview The implementation of scopes and context in Javascript is unique to the Javascript language. To some extent,

Simple JavaScript getting started tutorial (1): basic, simple javascript This article requires programming experience in other languages. Before learning Most programming languages have good and bad parts. This article only describes the good part of JavaScript, because: 1. Only the good part can shorten the learning time2. The code is more robust.3. The code is

| | event; var disx = Ev.clientx-this.offsetleft,disy = Ev.clienty-this.offsettop; var owidth = Obj.offsetwidth,oheight = Obj.offsetheight; Stop bubbling Time ev.stoppropagation? Ev.stoppropagation (): Ev.cancelbubble = true; Document.onmousemove = function (EV) {var ev = EV | | event; Obj.style.left = ev.clientx-disx + ' px '; Obj.style.top = Ev.

Everything in JavaScript is an object: A string, a value, an array, a function. The following small series for everyone to collect and organize some JavaScript objects and promise object implementation. The specific contents are as follows: The objects are everywhere. Window object Introduction to Common properties and methods Location Contains the URL of the page, and if this property is changed, th

Summary of little knowledge about JavaScript performance optimization, and javascript Performance Optimization With the development of the network, network speed and machine speed, more and more websites use a variety of client technologies. Ajax is currently the most popular method. JavaScript is an interpreted language, so it cannot reach the level of C/Java, w

DOM is a standard for getting, modifying, adding, or deleting HTML elements. The following describes how to operate htmldom nodes, for more information about how to obtain, modify, add, or delete HTML elements, see html dom. In html dom, everything is a node. DOM is the HTML of the node tree. According to W3C html dom standards, all content in HTML documents is node: The entire document is a document Node Each HTML element is an element node. The text in the HTML element is a text node. Each H

Javascript indirectly changes the CSS style by changing the element Class Name CSS: /* Font link style */TD. firstlevelmenuclass A: link {color: # 3e8bac; text-Decoration: none;}/* unaccessed link */TD. firstlevelmenuclass A: visited {color: # ffffff; text-Decoration: none;}/* accessed link */TD. firstlevelmenuclass A: hover {color: # ffffff;}/* move the cursor over the link */TD. firstlevelmenuclass A: active {color: # ffffff;}/* selected link * //

First. Move the mouse to the corresponding category, and the red triangle below will automatically follow, slowly following. No matter how many. JavaScript code: Function changecoord (ID, left) {$ (ID ). style. left = left;} function $ (ID) {return document. getelementbyid (ID);} function $ (ID) {return document. getelementsbyclassname (ID) [0];} function indexof (Arry, OBJ) {for (VAR I = 0; I

Getelementsbyclassname, Getelementsbyname, Queryselector and so on, in short, these methods of thinking basic and the above two are the same, is simply checking to see if the element exists.For the main question, someone has provided the following two interesting methods, one of which is: document.body.contains (Element), where the node.contains (Othernode) method is used, It can determine if Othernode is a descendant of node and returns a Boolean va

varGetelmsbyclsname =function(ClassName, results) {results= Results | | []; //determine if the browser supports Getelementsbyclassname if(document.getelementsbyclassname) {//browsers support this methodresults.push.apply (Results, Document.getelementsbyclassname (className)); } Else { //Browser does not support //implementation: Gets the elements of the page through the class name //Ideas:

to the element node for the given ID attribute value.4.getElementsByTagName ()Gets all eligible elements of a given label in the document, returns an array of objects5.getElementsByName ()Get an array of objects by name6.getElementsByClassName ()Get an array of objects by classnameThird, indirect reference node:1. Refer to child nodes:Childnodes[]:Each node has a ChildNodes collection property, and the type is an array object that represents the coll