


Complete code and detailed explanation of using javascript to dynamically create dom elements
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('append',domParams.parentNode,dynObj); } catch($e) { } return dynObj; } /**//* 从父结点中删除子结点 @actionType 默认为append,输入字符串 append | remove @parentNode 父结点的DOM对象,或者父结点的ID @childNode 被删除子结点的DOM对象 或者被删除子结点的ID */ function childNodeAction(actionType,parentNode,childNode) { if(!parentNode) {return; } parentNode=typeof parentNode==='string'?getElement(parentNode):parentNode; childNode=typeof childNode==='string'?getElement(childNode):childNode; if(!parentNode || !childNode) {return;} var action=actionType.toLowerCase(); if( null==actionType || action.length<=0 || action=='append') { action='parentNode.appendChild'; } else { action='parentNode.removeChild'; } try { eval(action)(childNode); } catch($e) { alert($e.message); } }
Usage example:
var htmlAttributes= [ {attrName:'class',attrValue:'样式名称'} //for IEs , {attrName:'className',attrValue: '样式名称'} //for ff ] var domParams={domTag:'p', content:'动态p的innerHTML', otherAttributes:htmlAttributes}; var newHtmlDom=dynCreateDomObject(domParams); //通过setAttribute('style','position:absolute.....................') //的形式来指定style没有效果,只能通过如下形式,jiong newHtmlDom.style.zIndex='8888'; newHtmlDom.style.position='absolute'; newHtmlDom.style.left='100px'; newHtmlDom.style.top='200px';
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