JSP頁面,實現上傳圖片即時顯示效果
阿新 • • 發佈:2019-01-30
<script type="text/javascript"> function setImagePreview() { var docObj = document.getElementById("doc"); var imgObjPreview = document.getElementById("preview"); if (docObj.files && docObj.files[0]) { //火狐下,直接設img屬性 imgObjPreview.style.display = 'block'; imgObjPreview.style.width = '300px'; imgObjPreview.style.height = '120px'; //imgObjPreview.src = docObj.files[0].getAsDataURL(); //火狐7以上版本不能用上面的getAsDataURL()方式獲取,需要一下方式 imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]); } else { //IE下,使用濾鏡 docObj.select(); var imgSrc = document.selection.createRange().text; var localImagId = document.getElementById("localImag"); //必須設定初始大小 localImagId.style.width = "250px"; localImagId.style.height = "200px"; //圖片異常的捕捉,防止使用者修改後綴來偽造圖片 try { localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; localImagId.filters .item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc; } catch (e) { alert("您上傳的圖片格式不正確,請重新選擇!"); return false; } imgObjPreview.style.display = 'none'; document.selection.empty(); } return true; } </script>
<body>
<input type=file name="doc" id="doc"
onchange="javascript:setImagePreview();">
<div id="localImag">
<img id="preview" width=-1 height=-1 style="diplay:none" />
</div>
</body>
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