java web上傳圖片時,顯示圖片
js指令碼
<script>
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 = '140px';
imgObjPreview.style.height = '140px';
//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 = "140px";
localImagId.style.height = "140px";
//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>
控制元件
<div id="localImag">
<img src=" " id="preview“ class="img-circle">
</div>
<input type="file" name="photo" onchange="javascript:setImagePreview();" id="doc">