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text.js
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text.js
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window.onload=function(){
var guideArr=[
//pic_btn分别为top，left，width，height width:95px; height:32px
{id:"ban_ner_wrapper",pic_src:"images/guide2.png",pic_btn:"210,146,95,32",pic_position:"bottom"},
{id:"u_login",pic_src:"images/guide1.png",pic_btn:"209,143,95,32",pic_position:"right"},
{id:"xlist",pic_src:"images/guide1.png",pic_btn:"209,143,95,32"},
{id:"picshow",pic_src:"images/guide2.png",pic_btn:"209,143,95,32",pic_position:"bottom"},
{id:"recommend",pic_src:"images/guide3.png",pic_btn:"207,153,95,32",pic_position:"bottom"},
{id:"postrank",pic_src:"images/guide3.png",pic_btn:"207,153,95,32"}
];
var finpic={pic_src:"images/guide3.png",pic_btn:"207,153,95,32"};
guide(guideArr,finpic);
};
function guide(guideArray,finishpic){
var introElem=new Array();
for (var i=0;i<guideArray.length; i++) {
var currentElement=document.getElementById(guideArray[i].id);
if(currentElement){introElem.push({element:currentElement,
src:guideArray[i].pic_src,
btn:guideArray[i].pic_btn,
position:guideArray[i].pic_position});}
}
if(introElem.length < 1) {return false;}
if(finishpic){introElem.push({element:null,src:finishpic.pic_src,btn:finishpic.pic_btn,position:finishpic.pic_position});}
for(var k=0;k<introElem.length;k++){
Preimg=new Image();
Preimg.src=introElem[k].src;
}
var oMask=document.createElement('div');
oMask.className='mask';
oMask.onclick=function(){_exitIntro()};
document.body.appendChild(oMask);
var currentStep=0;
_creatIntroItem(currentStep);
//生成第i个指导项和指导目标
function _creatIntroItem(targetStep){
var i=targetStep;
var aElem = document.body.querySelector('.intro-item');
if (aElem) {
if((i<introElem.length-1)||!finishpic){
elementPosition = _getPosition(introElem[i].element);
aElem.setAttribute('style', 'width: ' + (elementPosition.width + 10) + 'px;' +
'height:' + (elementPosition.height + 10) + 'px;' +
'top:' + (elementPosition.top - 5) + 'px;' +
'left: ' + (elementPosition.left - 5) + 'px;');
}else if((i==introElem.length-1)&&finishpic){
aElem.parentNode.removeChild(aElem);
aElem=document.createElement("div");
aElem.className='intro-closeitem';
document.body.appendChild(aElem);
}
var oldInBox = document.body.querySelector('.intro-box');
if (oldInBox) {oldInBox.parentNode.removeChild(oldInBox);}
}
else{
aElem=document.createElement('div');
aElem.className='intro-item';
elementPosition = _getPosition(introElem[i].element);
aElem.setAttribute('style', 'width: ' + (elementPosition.width + 10) + 'px; ' +
'height:' + (elementPosition.height + 10) + 'px; ' +
'top:' + (elementPosition.top - 5) + 'px;' +
'left: ' + (elementPosition.left - 5) + 'px;');
document.body.appendChild(aElem);
}
if((i<introElem.length-1)||!finishpic){
introElem[i].element.className += ' intro-showElement';
var currentElementPosition = introElem[i].element.style.position;
if (currentElementPosition !== 'absolute' &¤tElementPosition !== 'relative') {
introElem[i].element.className += ' intro-relativePosition';
}
}
var aStep=document.createElement('div');
aStep.className='intro-box';
aStep.style.opacity = 1;
var aImg=document.createElement('img');
aImg.src=introElem[i].src;
aStep.appendChild(aImg);
aImg.onload=function(){
if((i<introElem.length-1)||!finishpic){
var aStepPosition=_autosetImgPosition(introElem[i].element,introElem[i].position,aStep);
aStep.setAttribute('style','top:'+ aStepPosition.top+ 'px; left: '+ aStepPosition.left+'px');
}
else if((i==introElem.length-1)&&finishpic){
aStep.setAttribute('style','top:'+(-aStep.offsetWidth/2)+ 'px; left: '+(-aStep.offsetHeight/2)+'px');
aElem.style.top="50%";
aElem.style.left="50%";
}
};
aElem.appendChild(aStep);
var aA=document.createElement('a');
if(i==introElem.length-1){
aA.setAttribute("title","开始体验");
aA.innerHTML="开始体验";
aA.onclick=function(){_exitIntro();};
}
else if(i<introElem.length-1){
aA.setAttribute("title","下一步");
aA.innerHTML="下一步";
aA.onclick=function(){_nextIntro();};
}
var aA_btn=introElem[i].btn.split(',');
aA.setAttribute('style','top:'+aA_btn[0]+ 'px; left: '+aA_btn[1]+'px; width: '+aA_btn[2]+'px; height: '+aA_btn[3]+'px;');
aA.href = 'javascript:void(0);';
aStep.appendChild(aA);
var osTop = document.documentElement.scrollTop || document.body.scrollTop;
window.scrollBy(0,elementPosition.top-osTop-30);
}
//给图片框自动定位
function _autosetImgPosition(targetelem,position,step){
var ImgPosition={};
var elementPosition = _getPosition(targetelem);
switch(position)
{
case 'top':
ImgPosition.left=elementPosition.width/2-step.offsetWidth/2;
ImgPosition.top=-step.offsetHeight - 10;
break;
case 'bottom':
ImgPosition.left=elementPosition.width/2-step.offsetWidth/2;
ImgPosition.top=elementPosition.height+10;
break;
case 'left':
ImgPosition.top=10;
ImgPosition.left=-step.offsetWidth-10;
break;
case 'right':
ImgPosition.top=10;
ImgPosition.left=elementPosition.width + 10;
break;
default:
var winw=window.innerWidth|| document.body.clientWidth;
var winh=window.innerWidth|| document.body.clientHeight;
if(step.offsetWidth+10<elementPosition.left){
ImgPosition.left=-step.offsetWidth-10;
if(step.offsetHeight>elementPosition.height){ImgPosition.top=-step.offsetHeight+elementPosition.height;}
else{ImgPosition.top=10;}
}
else if((step.offsetWidth+elementPosition.left+elementPosition.width+10)<winw){
ImgPosition.left=elementPosition.width + 10;
if(step.offsetHeight>elementPosition.height){ImgPosition.top=-step.offsetHeight+elementPosition.height;}
else{ImgPosition.top=10;}
}
else{
ImgPosition.left=elementPosition.width/2-aStep.offsetWidth/2;
if(step.offsetHeight+10<elementPosition.top){ImgPosition.top=-step.offsetHeight - 10;}
else if((step.offsetHeight+elementPosition.top+elementPosition.height+10)<winh){ImgPosition.top=elementPosition.height+10;}
}
}
return ImgPosition;
}
//计算目标在页面中的位置
function _getPosition(element) {
var elementPosition = {};
elementPosition.width = element.offsetWidth;
elementPosition.height = element.offsetHeight;
var _x = 0;
var _y = 0;
while (element && !isNaN(element.offsetLeft) && !isNaN(element.offsetTop)) {
_x += element.offsetLeft;
_y += element.offsetTop;
element = element.offsetParent;
}
elementPosition.top = _y;
elementPosition.left = _x;
return elementPosition;
}
//下一步函数
function _nextIntro(){
var oldShowElement = document.querySelector('.intro-showElement');
if (oldShowElement) {
oldShowElement.className = oldShowElement.className.replace(/intro-[a-zA-Z]+/g, '').replace(/^\s+|\s+$/g, '');
}
_creatIntroItem(++currentStep);
}
//退出指引
function _exitIntro()
{
oMask.style.opacity = 0;
setTimeout(function () {
oMask.parentNode.removeChild(oMask);
}, 500);
var inElem = document.body.querySelector('.intro-item');
if (inElem) {
inElem.parentNode.removeChild(inElem);
}
var closeElem = document.body.querySelector('.intro-closeitem');
if (closeElem) {
closeElem.parentNode.removeChild(closeElem);
}
var InBox = document.body.querySelector('.intro-box');
if (InBox) {
InBox.parentNode.removeChild(InBox);
}
var showElement = document.querySelector('.intro-showElement');
if (showElement) {
showElement.className = showElement.className.replace(/intro-[a-zA-Z]+/g, '').replace(/^\s+|\s+$/g, '');
}
}
}