imgresize.js

来自「详述了Matlab中画图的命令及技巧」· JavaScript 代码 · 共 60 行

var imgMaxWidth=600;
function ImgLoad(obj)
{
	var imgs = obj.getElementsByTagName("img");
	for(var i=0;i<imgs.length;i++){
		var o=imgs[i];
		if (o.width>imgMaxWidth){
			if (o.style.width){
				o.style.width="";
			}
			o.width=imgMaxWidth;
			o.removeAttribute("height");
			o.setAttribute("title","ctrl+鼠标滚轮缩放");
			o.style.cursor="pointer";
			o.style.display="block";
			o.vspace=5;
			o.resized=1;
			o.onclick=ImgClick;
			o.onmousewheel=bbimg;
		}
		// 点图片下一页
		var gp = document.getElementById("goPage");
		if (gp && imgs.length==1 && o.width>200){
			o.style.cursor="pointer";
			o.onclick=goto;
		}
	}
}
function ImgClick()
{
	if (this.parentElement){
		if (this.parentElement.tagName!="A"){
			window.open(this.src);
		}
	}else{
		window.open(this.src);
	}
}
function bbimg()
{
	if (event.ctrlKey){
		var zoom=parseInt(this.style.zoom, 10)||100;
		zoom+=event.wheelDelta/12;
		if (zoom>0) this.style.zoom=zoom+'%';
		return false;
	}else{
		return true;
	}
}
function ImgPager(obj)
{
	var pd = document.getElementById("numPages");
	var o = obj.getElementsByTagName("img")[0];
	if (pd.innerHTML.length>0){
		alert("ok");
	}else{
		alert("no");
	}
}