iframe高度设置demo以及水印的简单添加

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我是靠谱客的博主优美胡萝卜，最近开发中收集的这篇文章主要介绍iframe高度设置demo以及水印的简单添加，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

不是专业人士,只说自己的一些看法.
对于iframe 的高度设置,如果父和子都能操作,那么可以在父或子中执行.一般是通过iframe的id来获取对象进行设置:父页面:

window.onload=function() {
var doc = document.getElementById("ifDemo")
var docWin = doc.contentWindow || iframe.contentDocument.parentWindow; //子内容对象
var height = docWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight; //子内容高度
doc.height = height;

子页面:


var obj = window.parent.document.getElementById("ifDemo");
var cHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
var sHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
var height = Math.max(cHeight, sHeight);
obj.height=height;

还有一种,是只能操作子页面,而且还不知道父页面中iframe的id或name,或class等信息,可以通过parent.frames;获取父页面中iframe数组信息,然后通过src来匹配


var frames=parent.frames;
var herf=window.location.href;
var obj;
for(var i=0;i<frames.length;i++){
if(herf==frames[i].frameElement.src){
obj=frames[i].frameElement;
break;
}
}
if(obj==undefined){
return;
}
var cHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
var sHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
var height = Math.max(cHeight, sHeight);
//alert(cHeight+","+sHeight+","+height)
obj.height = height;

父页面

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>iframe高度问题</title>
<script type="text/javascript" src="js/jquery-3.3.1.min.js"></script>
<script>
/*
* iframe子页面高度
*
window.onload=function() {
var doc = document.getElementById("ifDemo")
var docWin = doc.contentWindow ||
iframe.contentDocument.parentWindow; //子内容对象
var height = docWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight; //子内容高度
doc.height = height;
}*/
///水印
$(document).ready(function(e) {　　
var iframe = document.getElementById("ifDemo3");
if(iframe.attachEvent) {
iframe.attachEvent("onload", function() {
//iframe加载完成后你需要进行的操作
watermark(getNow());
});
} else {
iframe.onload = function() {
//iframe加载完成后你需要进行的操作
watermark(getNow());
};
}
})
/**
* 水印
* @param {Object} settings
*/
function watermark(settings) {
//默认设置
var defaultSettings = {
watermark_txt: settings,
watermark_x: 20, //水印起始位置x轴坐标
watermark_y: 20, //水印起始位置Y轴坐标
watermark_rows: 0, //水印行数
watermark_cols: 0, //水印列数
watermark_x_space: 100, //水印x轴间隔
watermark_y_space: 50, //水印y轴间隔
watermark_color: '#aaa', //水印字体颜色
watermark_alpha: 0.4, //水印透明度
watermark_fontsize: '15px', //水印字体大小
watermark_font: '微软雅黑', //水印字体
watermark_width: 220, //水印宽度
watermark_height: 80, //水印长度
watermark_angle: 20 //水印倾斜度数
};
if(arguments.length === 1 && typeof arguments[0] === "object") {
var src = arguments[0] || {};
for(key in src) {
if(src[key] && defaultSettings[key] && src[key] === defaultSettings[key]) continue;
else if(src[key]) defaultSettings[key] = src[key];
}
}
var oTemp = document.createDocumentFragment();
//获取页面最大宽度
var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
var cutWidth = page_width * 0.0150;
var page_width = page_width - cutWidth;
//获取页面最大高度
var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight); //+ 450;
page_height = Math.max(page_height, window.innerHeight - 30);
//如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
if(defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width * defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {
defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
}
//如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
if(defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {
defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
}
var x;
var y;
for(var i = 0; i < defaultSettings.watermark_rows; i++) {
y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
for(var j = 0; j < defaultSettings.watermark_cols; j++) {
x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
var mask_div = document.createElement('div');
mask_div.id = 'mask_div' + i + j;
mask_div.className = 'mask_div';
mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
//设置水印div倾斜显示
mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.visibility = "";
mask_div.style.position = "absolute";
mask_div.style.left = x + 'px';
mask_div.style.top = y + 'px';
mask_div.style.overflow = "hidden";
mask_div.style.zIndex = "9999";
//让水印不遮挡页面的点击事件
mask_div.style.pointerEvents = 'none';
mask_div.style.opacity = defaultSettings.watermark_alpha;
mask_div.style.fontSize = defaultSettings.watermark_fontsize;
mask_div.style.fontFamily = defaultSettings.watermark_font;
mask_div.style.color = defaultSettings.watermark_color;
mask_div.style.textAlign = "center";
mask_div.style.width = defaultSettings.watermark_width + 'px';
mask_div.style.height = defaultSettings.watermark_height + 'px';
mask_div.style.display = "block";
oTemp.appendChild(mask_div);
};
};
document.body.appendChild(oTemp);
}
function getNow() {
var d = new Date();
var year = d.getFullYear();
var month = change(d.getMonth() + 1);
var day = change(d.getDate());
var hour = change(d.getHours());
var minute = change(d.getMinutes());
var second = change(d.getSeconds());
function change(t) {
if(t < 10) {
return "0" + t;
} else {
return t;
}
}
var time = year + '年' + month + '月' + day + '日 ' + hour + '时' + minute + '分' + second + '秒';
return time;
}
</script>
</head>
<body>
<h1>父页面</h1>
<div>白日依山尽</div>
<div>黄河入海流</div>
<div>如穷千里目</div>
<div>快买摄像头</div>
<div><iframe id="ifDemo" src="test02.html"></iframe></div>
<h1>父页面</h1>
<div>床前明月光</div>
<div>疑是地上霜</div>
<div>举头望明月</div>
<div>低头在他乡</div>
<div><iframe id="ifDemo2" src="test03.html"></iframe></div>
<h1>父页面</h1>
<div>独在异乡为异客</div>
<div>每逢佳节倍思亲</div>
<div>遥知兄弟登高处</div>
<div>何日拆字幸我门</div>
<div><iframe id="ifDemo3" src="test04.html"></iframe></div>
</body>
</html>

子页面一

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>iframe高度问题</title>
<script>
window.onload = function() {
var obj = window.parent.document.getElementById("ifDemo");
var cHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
var sHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
var height = Math.max(cHeight, sHeight);
//alert(cHeight+","+sHeight+","+height)
obj.height=height;
}
</script>
</head>
<body>
<h1>子页面</h1>
<div>妹喜</div>
<div>妲己</div>
<div>褒姒</div>
<div>夏姬</div>
<div>孟姜女</div>
<div>赵飞燕</div>
<div>貂蝉</div>
<div>大桥</div>
<div>小乔</div>
<div>绿珠</div>
<div>谢道韫</div>
<div>李祖娥</div>
<div>杨玉环</div>
<div>李师师</div>
<div>陈圆圆</div>
<div>香妃</div>
</body>
</html>```
子页面二
```handlebars
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>iframe高度问题</title>
<script>
window.onload = function() {
//知道父页面iframeid
//var obj = window.parent.document.getElementById("ifDemo2");
//不知道父页面id和name
var frames=parent.frames;
var herf=window.location.href;
var obj;
for(var i=0;i<frames.length;i++){
if(herf==frames[i].frameElement.src){
obj=frames[i].frameElement;
break;
}
}
if(obj==undefined){
return;
}
var cHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
var sHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
var height = Math.max(cHeight, sHeight);
//alert(cHeight+","+sHeight+","+height)
obj.height = height;
}
</script>
</head>
<body>
<h1>子页面2</h1>
<div>夏启</div>
<div>商汤</div>
<div>姬发</div>
<div>嬴政</div>
<div>刘邦</div>
<div>刘秀</div>
<div>曹丕</div>
<div>刘备</div>
<div>孙权</div>
<div>司马炎</div>
<div>司马睿</div>
<div>刘裕</div>
<div>萧道成</div>
<div>萧衍</div>
<div>陈霸先</div>
<div>杨坚</div>
<div>李渊</div>
<div>朱温</div>
<div>李存勖</div>
<div>石敬瑭</div>
<div>刘知远</div>
<div>郭威</div>
<div>赵匡胤</div>
<div>完颜构</div>
<div>忽必烈</div>
<div>朱元璋</div>
<div>努尔哈赤</div>
</body>
</html>

子页面三

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>iframe高度问题</title>
<script>
window.onload = function() {
var obj = window.parent.document.getElementById("ifDemo3");
var cHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
var sHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
var height = Math.max(cHeight, sHeight);
//alert(cHeight+","+sHeight+","+height)
obj.height=height;
}
</script>
</head>
<body>
<h1>子页面3</h1>
<div>燧人氏</div>
<div>有巢氏</div>
<div>伏羲</div>
<div>女娲</div>
<div>神农</div>
<div>皇帝</div>
<div>蚩尤</div>
<div>颛顼</div>
<div>帝喾</div>
<div>少昊</div>
<div>唐尧</div>
<div>虞舜</div>
<div>夏禹</div>
<div>商</div>
<div>周</div>
<div>秦</div>
<div>西汉</div>
<div>东汉</div>
<div>魏</div>
<div>蜀</div>
<div>吴</div>
<div>西晋</div>
<div>东晋</div>
<div>宋</div>
<div>齐</div>
<div>梁</div>
<div>陈</div>
<div>隋</div>
<div>唐</div>
<div>梁</div>
<div>唐</div>
<div>汉</div>
<div>周</div>
<div>北宋</div>
<div>契丹</div>
<div>西夏</div>
<div>金</div>
<div>南宋</div>
<div>元</div>
<div>明</div>
<div>清</div>
</body>
</html>