JavaScript系列：動態(tài)創(chuàng)建iframe并加載頁面

標(biāo)簽：

JavaScript

业务需求
使用jQuery可以方便的创建html对象。
通过解析json数组，动态生成ifame按钮页，并点击不同的按钮跳转不同的页面，实现不同的功能。

代码实例
先导入jquery.min.js

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>加载iframe</title>
</head>
<body>
<div>
<input id="load" type="button" onClick="init()" value="加载"></input>
<div id="content"></div>
</div>
<script charset="utf-8" type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="js/jquery.min.js"></script>
<script charset="utf-8" type="text/javascript">
var data =  "{\"pump\":[{\"id\":\"1\",\"position\":[\"100\",\"100\"]}," +
                         "{\"id\":\"2\",\"position\":[\"150\",\"150\"]}," +
                         "{\"id\":\"3\",\"position\":[\"200\",\"200\"]}]," +
            "\"ventilate\":[{\"id\":\"4\",\"position\":[\"250\",\"250\"]}," +
                            "{\"id\":\"5\",\"position\":[\"300\",\"300\"]}," +
                            "{\"id\":\"6\",\"position\":[\"350\",\"350\"]}]}";
function init(){
    $("#load").hide();
    $("#content").show().empty();
    var obj = JSON.parse(data);
    var pump = obj.pump;
    var ventilate = obj.ventilate;
    //动态生成按钮页面
    for (var i = 0; i < pump.length; i++) {
        pump_id = pump[i].id;
        pump_position = pump[i].position;
        document.getElementById("content").innerHTML +=
            "</br><input id=\"pump"+pump_id+"\" type=\"button\" " +
            "onClick=\"showFrame('http://www.baidu.com',1280,760)\" value=\"排水"+pump_id+"\" style=\"position: relative\"><\/input>";
        $("#pump"+pump_id+"").css({"left":""+pump_position[0]+"px","top":""+pump_position[1]+"px"});
    }
    for (var i = 0; i < ventilate.length; i++) {
        ventilate_id = ventilate[i].id;
        ventilate_position = ventilate[i].position;
        document.getElementById("content").innerHTML +=
            "</br><input id=\"ventilate"+ventilate_id+"\"  type=\"button\" " +
            "onClick=\"showFrame('http://www.baidu.com',1280,760)\" value=\"通风"+ventilate_id+"\" style=\"position: relative\"><\/input>";
        $("#ventilate"+ventilate_id+"").css({"left":""+ventilate_position[0]+"px","top":""+ventilate_position[1]+"px"});
    }
}

//加载iframe页面
function showFrame(url,width,height){
    $("#content").hide();
    $("<iframe width='" + width + "' height='" + height + "' id='myFrame' " +
        "name='myFrame' style='position:absolute;'>" +
        "</iframe>").prependTo('body');
    //设置frame的位置
    var st=document.documentElement.scrollTop|| document.body.scrollTop;//滚动条距顶部的距离
    var sl=document.documentElement.scrollLeft|| document.body.scrollLeft;//滚动条距左边的距离
    var ch=document.documentElement.clientHeight;//屏幕的高度
    var cw=document.documentElement.clientWidth;//屏幕的宽度
    var objH=$("#myFrame").height();//浮动对象的高度
    var objW=$("#myFrame").width();//浮动对象的宽度
    var objT=Number(st)+(Number(ch)-Number(objH))/2;
    var objL=Number(sl)+(Number(cw)-Number(objW))/2;
    $("#myFrame").css('left',objL);
    $("#myFrame").css('top',objT);
    $("#myFrame").attr("src", url)
    //添加背景遮罩
    $("<div id='myFrameBg' style='display:block;position:absolute;opacity: 0.4;'/>").prependTo('body');
    var bgWidth = Math.max($("body").width(),cw);
    var bgHeight = Math.max($("body").height(),ch);
    $("#myFrameBg").css({width:bgWidth,height:bgHeight});

    //点击背景遮罩移除iframe和背景
    $("#myFrameBg").click(function() {
        $("#myFrame").remove();
        $("#myFrameBg").remove();
        $("#load").show();
    });
}
</script>
</body>
</html>