Question

PHP怎样上传图片以及预览图片？

Answer 1

本地图片，就搞个img，设置他的src就可以实现；
参考如下：

<div class="column " style="width: 400px; margin-left: 200px;" id="imageShow">
<div id="productImageNew">@*用于图片预览*@
</div>
<div id="productImage">
<div class="widget the-common-margin-top" style="height: 400px; border: 1px solid #eeeeee;
padding: 3px;">
<img id="imgHolder" style="max-height: 390px; max-width: 390px;" />
</div>
</div>
</div>
<form id="formImageUpload" name="formImageUpload" method="post" action="/DocTeam/ProductsImage/UploadImage"
enctype="multipart/form-data">
<div id="fileDiv">
<input type="file" id="theFile" name="theFile" size="20" style="cursor: pointer;
width: 65px; height: 60px; position: absolute; filter: alpha(opacity:1); -moz-opacity: 0;
opacity: 0; z-index: 102;" />
</div>
<input type="hidden" name="imageId_hide" id="imageId_hide" />
</form>
<div id="cover" style="position: absolute; background-color: White; z-index: 10;
filter: alpha(opacity=100); -moz-opacity: 1; opacity: 1; overflow: auto; width: 400px;">
<input id="selectImage" type="button" style="width: 65px; height: 60px;" value="Select" />
<br />
<br />
<input type="button" value="Upload" id="imageUpload" style="width: 65px; height: 60px;"
disabled="disabled" onclick="javascript:uploadImage();" />
</div>

//js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3
function PreviewImage(fileObj, imgPreviewId, divPreviewId) {
var allowExtention = ".jpg,.bmp,.gif,.png"; //允许上传文件的后缀名document.getElementById("hfAllowPicSuffix").value;
var extention = fileObj.value.substring(fileObj.value.lastIndexOf(".") + 1).toLowerCase();
var browserVersion = window.navigator.userAgent.toUpperCase();
if (allowExtention.indexOf(extention) > -1) {
if (fileObj.files) {//HTML5实现预览，兼容chrome、火狐7+等
if (window.FileReader) {
var reader = new FileReader();
reader.onload = function (e) {
document.getElementById(imgPreviewId).setAttribute("src", e.target.result);
}
reader.readAsDataURL(fileObj.files[0]);
} else if (browserVersion.indexOf("SAFARI") > -1) {
alert("不支持Safari6.0以下浏览器的图片预览!");
}
} else if (browserVersion.indexOf("MSIE") > -1) {
if (browserVersion.indexOf("MSIE 6") > -1) {//ie6
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
} else {//ie[7-9]
fileObj.select();
if (browserVersion.indexOf("MSIE 9") > -1)
fileObj.blur(); //不加上document.selection.createRange().text在ie9会拒绝访问
var newPreview = document.getElementById(divPreviewId + "New");
if (newPreview == null) {
newPreview = document.createElement("div");
newPreview.setAttribute("id", divPreviewId + "New");
}
var a = document.selection.createRange().text;
// newPreview.style.width = document.getElementById(imgPreviewId).width + "px";
// newPreview.style.height = document.getElementById(imgPreviewId).height + "px";
//newPreview.style.width = 390 + "px";
newPreview.style.height = 390 + "px";
newPreview.style.border = "solid 1px #eeeeee";
newPreview.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";
var tempDivPreview = document.getElementById(divPreviewId);
// tempDivPreview.parentNode.insertBefore(newPreview, tempDivPreview);
newPreview.style.display = "block";
tempDivPreview.style.display = "none";

}
} else if (browserVersion.indexOf("FIREFOX") > -1) {//firefox
var firefoxVersion = parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);
if (firefoxVersion < 7) {//firefox7以下版本
document.getElementById(imgPreviewId).setAttribute("src", fileObj.files[0].getAsDataURL());
} else {//firefox7.0+
document.getElementById(imgPreviewId).setAttribute("src", window.URL.createObjectURL(fileObj.files[0]));
}
} else {
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
}
} else {
alert("仅支持" + allowExtention + "为后缀名的文件!");
fileObj.value = ""; //清空选中文件
if (browserVersion.indexOf("MSIE") > -1) {
fileObj.select();
document.selection.clear();
}
fileObj.outerHTML = fileObj.outerHTML;
}
}

function setTheFileButton_Cover_SelectImageButton() {
// debugger;
// var position = $("#selectImage", "#cover").position();
// var css = { top: position.top, left: position.left };
// $("#theFile", "#fileDiv").css(css);
}

var $imgHolder = $('#imgHolder', "#productImage");
var tempDiv = $("#temp_div");
$("#select", "#cover").click(function () {
$("#theFile", "#fileDiv").click().select();
});
$("#theFile", "#fileDiv").click(function () {
$(this).blur();
});
$("#theFile", "#fileDiv").change(function () {
PreviewImage(this, 'imgHolder', 'productImage');
setTheFileButton_Cover_SelectImageButton();
// alert("预览已生成!");
$("#imageUpload").prop("disabled", false);
});

Answer 2

表单上传 后台files处理