Web从入门到放弃<5>
<1> CSS_DOM
1,structural layer
2,presentation layer
3,behavior layer
style也是一个属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<p id="text" style="background-color: #222222;color: white;">Hello World</p>
<script src="cp_10.js"></script>
</body>
</html>
js:
function someTest() {
var text = document.getElementById('text');
console.log(typeof text,"text:",text);
console.log(typeof text.nodeName , "nodeName:",text.nodeName);
console.log(typeof text.style ,"style:",text.style);
}
someTest();
output:
获取样式属性:
color="white"
alert(text.style.color);
color:#cc6600;
<2>设置样式的各种方法:
<p style="....."> </p>
这样的并不好，需要外部文件分离:
如果要设置文档所有的<p> 元素CSS:
p{
background-color: #333333;
color: white;
}
如果要设置文档id为text的<p>元素 CSS:
p#text{
background-color: #333333;
color: white;
}
如果要设置文档id为text的元素CSS:
#text{
background-color: #333333;
color: white;
}
如果要设置文档class为textClass的元素CSS:
.textClass{
background-color: #333333;
color: white;
}
但是这样的方式在DOM中会无法获取样式,不过在DOM里设置可以.
window.onload= function () {
var text = document.getElementById('text');
text.style.backgroundColor="#222222";
text.style.color = "white";
}
<3>只设置h1下一个节点的样式:
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>This is a Test</h1>
<p>"HelloWorld"</p>
<h1> <em>Test</em> Houdini VFX </h1>
<p>"HelloWorld"</p>
<script src="cp_10_03.js"></script>
</body>
</html>
js:
var headers = document.getElementsByTagName('h1');
for(var i=0;i<headers.length;i++){
console.log(headers[i],"**type is*:" , headers[i].nodeType);
console.log('nextSibling:',headers[i].nextSibling.nodeType , "data is:" , headers[i].nextSibling);
//console.log("getNextElement:",getNextElement(headers[i].nextSibling));
var elm = getNextElement(headers[i].nextSibling);
console.log("Find element :" , elm);
elm.style.color = "#888888";
elm.style.backgroundColor = "black";
elm.style.fontWeight = "bold";
}
function getNextElement(node)
{
if(node.nodeType===1){
return node;
}
if(node.nextSibling){
return getNextElement(node.nextSibling);
}
return null;
}
<4> 表格:
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" media="screen" href="cp_11_01.css">
</head>
<body> <table>
<caption>Types</caption>
<thead>
<tr>
<th>Houdini</th>
<th>Support</th>
</tr>
</thead> <tbody>
<tr>
<td>Dop</td>
<td>Yes</td>
</tr>
<tr>
<td>Animation</td>
<td>Yes</td>
</tr>
<tr>
<td>Compile JIT</td>
<td>Yes</td>
</tr>
<tr>
<td>Rop</td>
<td>Yes</td>
</tr>
<tr>
<td>Cop</td>
<td>Yes</td>
</tr>
<tr>
<td>FileSystem</td>
<td>No</td>
</tr>
</tbody> <tfoot>
<tr>
<td>suggestions</td>
<td>strongly recommend</td>
</tr>
</tfoot> </table> </body>
</html>
CSS:
body{
font-family: Consolas;
background-color: #333333;
color:white;
}
table{
margin: auto; /*set this will show table in center*/
border: 3px solid #699;
}
caption{
margin: auto;
padding: 0.2em;
font-size: 1.2em;
font-weight: bold;
}
th{
font-weight:normal;
font-style: italic;
text-align: left;
border: 1px dotted #699;
background-color: #9cc;
color:black;
}
th,td{
width: 10em;
padding:0.5em;
}
tr:hover{
background-color: #cccccc;
}
/*
tr:nth-child(odd){
background-color: #9cc;
}
tr:nth-child(even){
background-color: #922;
}
*/
要做一个奇偶颜色交替变换CSS带了一种:
tr:nth-child(odd){
background-color: #9cc;
}
tr:nth-child(even){
background-color: #922;
}
但是 thread标签里的也被改了:因为thread第一个是0...然后从<tbody> </tbody>开始正常了。。。到最后的<tfoot><tfoot>又抽风。。解决重复的问题必须用javascript
正确姿势的javascript:
function addUniqueColor(){
var tables = document.getElementsByTagName('table');
if(tables.length<1)return false;
for(var i=0;i<tables.length;i++){
var current_table = tables[i];
// only set <tbody></tbody>
var tbodys = current_table.getElementsByTagName('tbody');
if (tbodys.length<1)
continue;
// find tbody's tr
for(var j=0;j<tbodys.length;j++){
var current_tbody = tbodys[j];
var targetTrs = current_tbody.getElementsByTagName('tr');
if(targetTrs.length<1) continue;
var odd = false;
for(var k=0;k<targetTrs.length;k++){
if(odd === false) {
targetTrs[k].style.backgroundColor = '#444444';
odd = true;
}
else
{
targetTrs[k].style.backgroundColor = '#222222';
odd = false;
}
}
}
}
}
不过Hover丢失了,解决办法用事件:
书中给的方法:
elm.onmouseover = function(){}
elm.onmouseout = function(){}
根据qml命名使用也一样...
elm.onmouseenter= function(){}
elm.onmouseleave= function(){}
html里特意增加了两个表格，测试代码准确性：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" media="screen" href="cp_11_01.css">
</head>
<body> <table>
<caption>Types</caption>
<thead>
<tr>
<th>Houdini</th>
<th>Support</th>
</tr>
</thead> <tbody>
<tr>
<td>Dop</td>
<td>Yes</td>
</tr>
<tr>
<td>Animation</td>
<td>Yes</td>
</tr>
<tr>
<td>Compile JIT</td>
<td>Yes</td>
</tr>
<tr>
<td>Rop</td>
<td>Yes</td>
</tr>
<tr>
<td>Cop</td>
<td>Yes</td>
</tr>
<tr>
<td>FileSystem</td>
<td>No</td>
</tr>
</tbody> <tfoot>
<tr>
<td>suggestions</td>
<td>strongly recommend</td>
</tr>
</tfoot> </table> <table>
<caption>Types</caption>
<thead>
<tr>
<th>Maya</th>
<th>Support</th>
</tr>
</thead> <tbody>
<tr>
<td>Dop</td>
<td>No</td>
</tr>
<tr>
<td>Animation</td>
<td>Yes</td>
</tr>
<tr>
<td>Compile JIT</td>
<td>No</td>
</tr>
<tr>
<td>Rop</td>
<td>No</td>
</tr>
<tr>
<td>Cop</td>
<td>No</td>
</tr>
<tr>
<td>FileSystem</td>
<td>No</td>
</tr>
</tbody> <tfoot>
<tr>
<td>suggestions</td>
<td>Not recommend</td>
</tr>
</tfoot> </table> <script src="cp_11_01.js"></script>
</body>
</htm
js:
function addUniqueColor(){
var odd = {"falseColor":'#444444', "trueColor":"#222222" , "hoverColor":"#cccccc"};
var tables = document.getElementsByTagName('table');
if(tables.length<1)return false;
for(var i=0;i<tables.length;i++){
var current_table = tables[i];
// only set <tbody></tbody>
var tbodys = current_table.getElementsByTagName('tbody');
if (tbodys.length<1)
continue;
// only find tbody's tr
for(var j=0;j<tbodys.length;j++){
var current_tbody = tbodys[j];
var targetTrs = current_tbody.getElementsByTagName('tr');
if(targetTrs.length<1) continue;
var state = false;
var mapping = [];
for(var k=0;k<targetTrs.length;k++) {
// give unique color
if(state === false) {
targetTrs[k].style.backgroundColor = odd.falseColor;
mapping[k] = odd.falseColor;
// set the leave event also follow default color
targetTrs[k].onmouseleave = function () {
this.style.backgroundColor = odd.falseColor;
};
state = true;
}
else {
targetTrs[k].style.backgroundColor = odd.trueColor;
// set the leave event also follow default color
targetTrs[k].onmouseleave = function () {
this.style.backgroundColor = odd.trueColor;
};
state = false;
}
// set the enter event
targetTrs[k].onmouseenter = function () {
onMouseIn(this,odd);
};
}
}
}
}
function addOnLoadEvent(func) {
var oldEvent = window.onload ;
if(typeof window.onload !== "function"){
window.onload = func;
}
else{
window.onload = function () {
oldEvent();
func();
}
}
}
function onMouseIn(node , odd) {
console.log('mouse In:',node ,odd);
node.style.backgroundColor = odd.hoverColor;
}
addOnLoadEvent(addUniqueColor);
<4> Javascript DOM 动画API
一个简单的CSS , XY控制方法
h1{
position: absolute;
top:60px;
left: 100px;
}
转换成javascript
function addLoadEvent(func) {
var oldEvent = window.onload;
if(typeof window.onload !== "function"){
window.onload = func;
}
else{
window.onload=function () {
oldEvent();
func();
}
}
}
function positionMessage() {
if(!document.getElementById){return false;}
if(!document.getElementById('message')){return false;}
var elm = document.getElementById('message');
elm.style.position = 'absolute';
elm.style.top = '50px';
elm.style.left = '150px';
}
addLoadEvent(positionMessage);
关键函数:
1.var handleNum = setTimeOut("function",time);
2,clearTimeOut(handleNum)
3,parseInt(),parseFloat()
js代码:假如一个movemessage函数，调用方法似乎放到positionMessage函数里，设置1000ms,也就是1秒后，会进入moveMessage()函数。
这段代码像一个时间事件一样从positionMessage() 函数跳入moveMessage()函数 ，并没有什么迭代过程。。。
function addLoadEvent(func) {
var oldEvent = window.onload;
if(typeof window.onload !== "function"){
window.onload = func;
}
else{
window.onload=function () {
oldEvent();
func();
}
}
}
function positionMessage() {
if(!document.getElementById){return false;}
if(!document.getElementById('message')){return false;}
var elm = document.getElementById('message');
elm.style.position = 'absolute';
elm.style.top = '50px';
elm.style.left = '150px';
var movement = setTimeout("moveMessage()",1000);
//clearTimeout(movement);
}
function moveMessage() {
if(!document.getElementById){return false;}
if(!document.getElementById('message')){return false;}
var elm = document.getElementById('message');
elm.style.position = 'absolute';
elm.style.top = '150px';
elm.style.left = '250px';
}
addLoadEvent(positionMessage);
一个简单的动画:
将var movement = setTimeout("moveMessage()",10); 放入moveMessage()函数体呢，
就变成了每次执行moveMessage()，都会启用setTimeOut()函数。然后变成循环函数。
function addLoadEvent(func) {
var oldEvent = window.onload;
if(typeof window.onload !== "function"){
window.onload = func;
}
else{
window.onload=function () {
oldEvent();
func();
}
}
}
function positionMessage() {
if(!document.getElementById){return false;}
if(!document.getElementById('message')){return false;}
var elm = document.getElementById('message');
elm.style.position = 'absolute';
elm.style.top = '50px';
elm.style.left = '150px';
//var movement = setTimeout("moveMessage()",1000);
//clearTimeout(movement);
}
function moveMessage() {
if(!document.getElementById){return false;}
if(!document.getElementById('message')){return false;}
var elm = document.getElementById('message');
var xpos = parseInt(elm.style.left);
var ypos = parseInt(elm.style.top);
if(xpos === 200 && ypos === 200){
return true;
}
if(xpos<200){xpos++;}
if(xpos>200){xpos--;}
if(ypos<200){ypos++;}
if(ypos>200){ypos--;}
console.log("current position xy:",xpos,ypos);
elm.style.left = xpos + 'px';
elm.style.top = ypos + 'px';
var movement = setTimeout("moveMessage()",10);
}
addLoadEvent(positionMessage);
addLoadEvent(moveMessage);
显示<a> 的缩略图,其中有一点使用了clearTimeOut() ,并且修改了moveElement()函数。其中的时间事件每次清理。
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="web_design.css"/>
</head>
<body> <h1> Web Design</h1> <ol id="linklist">
<li> <a href="#">structure</a> </li>
<li> <a href="#">presentation</a> </li>
<li> <a href="#">behavior</a> </li> </ol> <div id="slideshow">
<img src="data:images/topics.jpg" alt="building blocks of web design" id="preview"/>
</div>
<script src="web_design.js"></script>
</body>
</html>
js:
function addLoadEvent(func) {
var oldFunc = window.onload;
if(typeof window.onload !== "function"){
window.onload = func;
}
else{
window.onload = function (ev) {
oldFunc();
func();
}
}
}
function eventsLinks()
{
var links = document.getElementsByTagName('a');
var preview = document.getElementById('preview');
if(!links)return false;
if(!preview) return false;
console.log(links);
links[0].onmouseover = function () {
moveElement('preview',-100,0,0)
};
links[1].onmouseover = function () {
moveElement('preview',-200,0,0)
};
links[2].onmouseover =function () {
moveElement('preview',-300,0,0)
};
}
function moveElement(elementID,final_x,final_y,phase) {
var elm = document.getElementById(elementID);
if(!elm)return false;
// if have time handel clear it
if(elm.movement) clearTimeout(elm.movement);
// if left and top attribute do not exist
if(!elm.style.left) elm.style.left = '0px';
if(!elm.style.top) elm.style.top = '0px';
//
var xpos = parseInt(elm.style.left);
var ypos = parseInt(elm.style.top);
if(xpos === final_x && ypos===final_y) return true;
// x motion
if(xpos>final_x) xpos = xpos - Math.ceil((xpos - final_x) / 10);
if(xpos<final_x) xpos = xpos + Math.ceil((final_x - xpos) / 10);
// y motion
if(ypos>final_y) ypos = ypos - Math.ceil((ypos-final_y) / 10);
if(ypos<final_y) ypos = ypos + Math.ceil((final_y-ypos) / 10);
elm.style.left = xpos + 'px';
elm.style.top = ypos + 'px';
var repeat = "moveElement('"+elementID+"',"+final_x+", "+final_y+" , "+phase+")";
console.log("repeat command:",repeat);
elm.movement = setTimeout(repeat,phase);
}
addLoadEvent(eventsLinks);
css:
body{
font-family: Consolas;
}
#slideshow{
width: 100px;
height:100px;
position: absolute;
overflow: hidden;
}
#preview{
left:0px;
top: 0px;
position: absolute;
}
...
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