<html5+css3+js>文档对象模型,对元素的各种操作
2015-12-01 15:53
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(《javascript&jquery交互式web前端开发》学习记录)
对元素的各种操作代码如下:
html5:
代码下载:http://download.csdn.net/detail/qq_17615475/9351235
对元素的各种操作代码如下:
html5:
<!doctype html> <html> <head> <meta charset="UTF-8"> <title>get element</title> <link rel="stylesheet" href="get-element.css" /> </head> <body> <div id="page"> <h1 id="header">List King</h1> <h2>Buy groceries</h2> <ul> <li id="one" class="hot"><em>fresh</em> figs</li> <li id="two" class="hot">pine nuts</li> <li id="three" class="hot">honey</li> <li id="four">balsamic vinegar</li> </ul> <div id="scriptResults"></div> </div> <script src="get-element.js"></script> </body> </html>javascript:
//get element by id /*var el=document.getElementById('one'); el.className='cool'; */ //get element by classname /*var elements=document.getElementsByClassName('hot'); if(elements.length>2){ var el=elements[2]; el.className='cool'; }*/ //get element by tagname /*var elements=document.getElementsByTagName('li'); if(elements.length>0){ var el=elements[0]; el.className='cool'; }*/ //get element by query selector, returns the first match /*var el=document.querySelector('li.hot'); el.className='cool';*/ //get element by query selector, returns a node list /*var els=document.querySelectorAll('li.hot'); els[1].className='cool';*/ //loop through node list /*var hotItems=document.querySelectorAll('li.hot'); if(hotItems.length>0){ for(var i=0;i<hotItems.length;i++){ hotItems[i].className='cool'; } }*/ //select the starting point and its siblings /*var startItem=document.getElementById('two'); var prevItem=startItem.previousSibling; var nextItem=startItem.nextSibling; prevItem.className='complete'; nextItem.className='cool';*/ //select the starting point and find its children /*var startItem=document.getElementByTagName('ul')[0]; var firstItem=startItem.firstChild; var lastItem=startItem.lastChild; firstItem.setAttribute('class','complete'); lastItem.setAttribute('class','cool');*/ //update the list item with nodeValue /*var itemTwo=document.getElementById('two'); var elText=itemTwo.firstChild.nodeValue; elText=elText.replace('pine nuts','kale'); itemTwo.firstChild.nodeValue=elText;*/ //update the list item with textContent /*var firstItem = document.getElementById('one'); var showTextContent = firstItem.textContent; var showInnerText = firstItem.innerText; var msg = '<p>textContent: ' + showTextContent + '</p>'; msg += '<p>innerText: ' + showInnerText + '</p>'; var el = document.getElementById('scriptResults'); el.innerHTML = msg; firstItem.textContent = 'sourdough bread';*/ //update the text and tag with innerHTML /*var firstItem=document.getElementById('one'); var itemContent=firstItem.innerHTML; firstItem.innerHTML='<a href=\"http:example.org\">'+itemContent+'</a>';*/ //create a new element and add to DOM tree /*var newEl = document.createElement('li'); var newText=document.createTextNode('quinoa'); newEl.appendChild(newText); var position=document.getElementsByTagName('ul')[0]; position.appendChild(newEl);*/ //remove elements from a DOM tree /*var removeEl=document.getElementsByTagName('li')[3]; var containerEl=removeEl.parentNode; containerEl.removeChild(removeEl);*/ //get the value of an attribute /*var firstItem=document.getElementById('one'); if(firstItem.hasAttribute('class')){ var attr=firstItem.getAttribute('class'); var el=document.getElementById('scriptResults'); el.innerHTML='<p>The first item has a class name:'+attr+'</p>'; }*/ //create an attribute for an element /*var firstItem=document.getElementById('one'); firstItem.className='complete'; var fourthItem=document.getElementsByTagName('li').item(3); fourthItem.setAttribute('class','cool');*/ //remove attributes /*var firstItem=document.getElementById('one'); if(firstItem.hasAttribute('class')){ firstItem.removeAttribute('class'); }*/ //1. add one element in the begining of the list 9c2a and one in the end //2. set 'class' attribute for all elements in the list //3. add the number of list elements in the header var list=document.getElementsByTagName('ul')[0]; var newItemLast=document.createElement('li'); var newTextLast=document.createTextNode('cream'); newItemLast.appendChild(newTextLast); list.appendChild(newItemLast); var newItemFirst=document.createElement('li'); var newTextFirst=document.createTextNode('kale'); newItemFirst.appendChild(newTextFirst); list.insertBefore(newItemFirst,list.firstChild); var listItems=document.querySelectorAll('li'); var i; for(i=0;i<listItems.length;i++){ listItems[i].className='cool'; } var heading=document.querySelector('h2'); var headingText=heading.firstChild.nodeValue; var totalItems=listItems.length; var newHeading = headingText + '<span>' + totalItems + '</span>'; heading.innerHTML=newHeading;css:
@charset "UTF-8"; /* CSS Document */ body{ background:#000000; font-family:Cambria, "Hoefler Text", "Liberation Serif", Times, "Times New Roman", serif; margin:0; padding:0; } #page{ background-color:#3C3A3A; margin:0 auto 0 auto; padding:0; max-width:480px; } h1{ background:url(kinglogo.png) no-repeat center center; text-align:center; text-indent:-1000%; overflow:hidden; height:75px; line-height:75px;/*设置行间距,间距为lineheight-fontsize*/ width:117px; margin:0 auto; padding:30px 10px 20px; } h2{ color:#FFFFFF; font-size:200%; text-align:center; text-transform:uppercase;/*控制文本大小写,capitalize每个单词以大写字母开头,lowercace全小写字母*/ margin:0 0 20px 0; letter-spacing:.2em;/*设置字间距为0.2倍fontsize*/ } ul{ padding:0; } li{ display:block; color:#FFFFFF; background:#F39D0F; padding:15px; border-top:1px solid #FFC877; border-bottom:1px solid #C78426; font-size:150%; text-shadow:2px 2px 1px #545454; } .hot{ background:#F6474A; border-top:1px solid #F78F91; border-bottom:1px solid #C62729; } .cool{ background:#8ACE8C; border-top:1px solid #D9F7D0; border-bottom:1px solid #6B9F4B; } .complete{ background:#7D7D7D url(icon-trash.png) no-repeat right; border-top:1px solid #C6C5C5; border-bottom:1px solid #353535; } p{ color:#2B2B2B; background-color:#FFFFFF; text-align:center; border-radius:5px; padding:10px; margin:20px auto; max-width:80%; min-width:20%; } #scriptResults{ padding-bottom:4px; } li a{ color:#FFFFFF; text-decoration:none; background:url(icon-link.png) no-repeat right; padding-right:40px; } h2 span{ font-size:50%; text-align:center; background-color:#000000; display:inline-block; padding-left:5px; border-radius:50%; position:relative; bottom:5px; }
代码下载:http://download.csdn.net/detail/qq_17615475/9351235
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