Home Web Front-end JS Tutorial Complete code and detailed explanation of using javascript to dynamically create dom elements

Complete code and detailed explanation of using javascript to dynamically create dom elements

Jul 21, 2017 am 09:53 AM
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By clicking on an element, a DOM element is dynamically created and displayed. Record it here:


/**//* 
动态创建DOM元素的相关函数支持 
*/ 
/**//* 
获取以某个元素的DOM对象 
@obj 该元素的ID字符串 
*/ 
function getElement(obj) 
{ 
return typeof obj=='string'?document.getElementById(obj):obj; 
} 
/**//* 
获取某个元素的位置 
@obj 该元素的DOM对象,或该元素的ID 
*/ 
function getObjectPosition(obj) 
{ 
obj=typeof obj==='string'?getElement(obj):obj; 
if(!obj) 
{ 
return; 
} 
var position=''; 
if(obj.getBoundingClientRect) //For IEs 
{ 
position=obj.getBoundingClientRect(); 
return {x:position.left,y:position.top}; 
} 
else if(document.getBoxObjectFor) 
{ 
position=document.getBoxObjectFor(obj); 
return {x:position.x,y:position.y}; 
} 
else 
{ 
position={x:obj.offsetLeft,y:obj.offsetTop}; 
var parent=obj.offsetParent; 
while(parent) 
{ 
position.x+=obj.offsetLeft; 
position.y+=obj.offsetTop; 
parent=obj.offsetParent; 
} 
return position; 
} 
} 
/**//* 
为某个DOM对象动态绑定事件 
@oTarget 被绑定事件的DOM对象 
@sEventType 被绑定的事件名,注意,不加on的事件名,如 'click' 
@fnHandler 被绑定的事件处理函数 
*/ 
function addEventHandler(oTarget, sEventType, fnHandler) 
{ 
if (oTarget.addEventListener) 
{ 
oTarget.addEventListener(sEventType, fnHandler, false); 
} 
else if (oTarget.attachEvent) //for IEs 
{ 
oTarget.attachEvent("on" + sEventType, fnHandler); 
} 
else 
{ 
oTarget["on" + sEventType] = fnHandler; 
} 
} 
/**//* 
从某个DOM对象中去除某个事件 
@oTarget 被绑定事件的DOM对象 
@sEventType 被绑定的事件名,注意,不加on的事件名,如 'click' 
@fnHandler 被绑定的事件处理函数 
*/ 
function removeEventHandler(oTarget,sEventType,fnHandler) 
{ 
if(oTarget.removeEventListener) 
{ 
oTarget.removeEventListener(sEventType,fnHandler,false) 
} 
else if(oTarget.detachEvent) //for IEs 
{ 
oTarget.detachEvent(sEventType,fnHandler); 
} 
else 
{ 
oTarget['on'+sEventType]=undefined; 
} 
} 

/**//* 
创建动态的DOM对象 
@domParams是被创建对象的属性的JSON表达,它具有如下属性: 
@parentNode 被创建对象所属的父级元素(可为元素ID,也可为DOM对象) 
@domId 被创建对象的ID 
@domTag 被创建对象的tag名称,支持常用的布局元素,如p span等,但不支持input\form等特别的元素 
@content 被创建的对象内容 
@otherAttributes 为被创建的对象添加除函数必需的属性外其它属性,如[{attrName:'style.color',attrValue:'red'}] 
@eventRegisters 为被创建的对象添加事件,类似[{eventType:'click',eventHandler:adsfasdf}]的数组 
-经过组合后,该参数具有如下形式: 
{parentNode:document.body,domTag:'p',content:'这是测试的',otherAttributes:[{attrName:'style.color',attrValue:'red'}],eventRegisters:[{eventType:'click',eventHandler:fnHandler}]} 
*/ 
function dynCreateDomObject(domParams) 
{ 
if(getElement(domParams.domId)) 
{ 
childNodeAction('remove',domParams.parentNode,domParams.domId); 
} 

var dynObj=document.createElement(domParams.domTag); 

with(dynObj) 
{ 
//id也可以通过otherAttributes传入,但是出于ID的特殊性,此处仍然采用 
//JSON对象传入,并以DOM ID属性附件 
id=domParams.domId; 
innerHTML=domParams.content; //innerHTML是DOM属性,而id等是元素属性,注意区别 
} 
/**//*添加属性*/ 
if(null!=domParams.otherAttributes) 
{ 
for(var i=0;i<domParams.otherAttributes.length;i++) 
{ 
var otherAttribute =domParams.otherAttributes[i]; 
dynObj.setAttribute(otherAttribute.attrName,otherAttribute.attrValue); 
} 
} 
/**//*end 添加属性*/ 
/**//*添加相关事件*/ 
if(null!=domParams.eventRegisters) 
{ 
for(var i=0;i<domParams.eventRegisters.length;i++) 
{ 
var eventRegister =domParams.eventRegisters[i]; 
addEventHandler(dynObj,eventRegister.eventType,eventRegister.eventHandler); 
} 
} 
/**//*end 添加相关事件*/ 
try 
{ 
childNodeAction(&#39;append&#39;,domParams.parentNode,dynObj); 
} 
catch($e) 
{ 

} 

return dynObj; 
} 
/**//* 
从父结点中删除子结点 
@actionType 默认为append,输入字符串 append | remove 
@parentNode 父结点的DOM对象,或者父结点的ID 
@childNode 被删除子结点的DOM对象 或者被删除子结点的ID 
*/ 
function childNodeAction(actionType,parentNode,childNode) 
{ 
if(!parentNode) 
{return; } 


parentNode=typeof parentNode===&#39;string&#39;?getElement(parentNode):parentNode; 
childNode=typeof childNode===&#39;string&#39;?getElement(childNode):childNode; 
if(!parentNode || !childNode) 
{return;} 

var action=actionType.toLowerCase(); 
if( null==actionType || action.length<=0 || action==&#39;append&#39;) 
{ 
action=&#39;parentNode.appendChild&#39;; 
} 
else 
{ 
action=&#39;parentNode.removeChild&#39;; 
} 

try 
{ 
eval(action)(childNode); 
} 
catch($e) 
{ 
alert($e.message); 
} 
}
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Usage example:


var htmlAttributes= 
[

{attrName:&#39;class&#39;,attrValue:&#39;样式名称&#39;} //for IEs

,

{attrName:&#39;className&#39;,attrValue: &#39;样式名称&#39;} //for ff

] 

var domParams={domTag:&#39;p&#39;, content:&#39;动态p的innerHTML&#39;, otherAttributes:htmlAttributes};

var newHtmlDom=dynCreateDomObject(domParams);

//通过setAttribute(&#39;style&#39;,&#39;position:absolute.....................&#39;)

//的形式来指定style没有效果,只能通过如下形式,jiong

newHtmlDom.style.zIndex=&#39;8888&#39;;

newHtmlDom.style.position=&#39;absolute&#39;;

newHtmlDom.style.left=&#39;100px&#39;;

newHtmlDom.style.top=&#39;200px&#39;;
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