JS:
<script type="text/javascript"> function previewImage(file) { var MAXWIDTH = 150; var MAXHEIGHT = 200; var div = document.getElementById('preview'); if (file.files && file.files[0]) { div.innerHTML = '<img id=imghead>'; var img = document.getElementById('imghead'); img.onload = function () { var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); img.width = rect.width; img.height = rect.height; img.style.marginLeft = rect.left + 'px'; img.style.marginTop = rect.top + 'px'; } var reader = new FileReader(); reader.onload = function (evt) { img.src = evt.target.result; } reader.readAsDataURL(file.files[0]); } else { var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="'; file.select(); var src = document.selection.createRange().text; div.innerHTML = '<img id=imghead>'; var img = document.getElementById('imghead'); img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src; var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height); div.innerHTML = "<div id=divhead style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;margin-left:" + rect.left + "px;" + sFilter + src + "\"'></div>"; } } function clacImgZoomParam(maxWidth, maxHeight, width, height) { var param = { top: 0, left: 0, width: width, height: height }; if (width > maxWidth || height > maxHeight) { rateWidth = width / maxWidth; rateHeight = height / maxHeight; if (rateWidth > rateHeight) { param.width = maxWidth; param.height = Math.round(height / rateWidth); } else { param.width = Math.round(width / rateHeight); param.height = maxHeight; } } param.left = Math.round((maxWidth - param.width) / 2); param.top = Math.round((maxHeight - param.height) / 2); return param; } </script>
Html:
<div style="display: none"> <asp:FileUpload ID="FupImg" onchange="previewImage(this)" runat="server"></asp:FileUpload> </div> <a href="Javascript:void()" onclick="FupImg.click()"> <div id="preview"> <asp:Image ID="ImgTx" ImageUrl="/Images/1111.jpg" runat="server" /></div> </a>