我正在使用Jcrop jQuery API来裁剪图像。因此,对于它,首先用户点击链接“更改图片”,它将打开“文件浏览器”。用户选择图像后,一个灯箱将打开2个框,1个显示original image,另一个显示裁剪后的preview of image。但是,在Chrome中,original image以全尺寸打开,即使它在CSS中设置了固定的最大宽度和最大高度。并且,当我在没有刷新窗口的情况下再次打开灯箱时,它将根据最大宽度和最大高度显示图像。我不知道问题出在哪里。它在Firefox中运行得很好。我也附上了截图。
代码如下:
这是包含裁剪图像的值的表单。当用户单击Change Picture链接(代码中未显示)时,将显示文件选择器upload-profile-pic。在用户选择图像后,它将被设置在id为uploaded-image的img标签中。
<form id="crop-image" name="cropImageForm" action="/user/UploadProfilePicture.action" method="POST" enctype="multipart/form-data">
<input id="imgX" name="imgX" type="hidden" />
<input id="imgY" name="imgY" type="hidden" />
<input id="imgW" name="imgW" type="hidden" />
<input id="imgH" name="imgH" type="hidden" />
<input id="upload-profile-pic" name="uploadedImage" type="file" style="display: none;" accept="image/*" onchange="checkUploadedFile();" />
</form>
<a href="/lightbox-pages/crop-profile-pic.jsp?lightbox[width]=800&lightbox[height]=600" style="display: none;" id="crop-profile-pic">Crop Profile Picture</a>
<img id="uploaded-image" style="display: none;" />uploaded-image的src属性设置代码:
var uploadedImage;
var lightBoxNotOpened=true;//to prevent image from opening twice in lightbox
function checkUploadedFile() {
var fileElement = document.getElementById("upload-profile-pic");
var fileExtension = "";
if (fileElement.value.lastIndexOf(".") > 0) {
fileExtension = fileElement.value.substring(fileElement.value.lastIndexOf(".") + 1, fileElement.value.length);
}
if (fileExtension == "jpg" || fileExtension == "JPG" || fileExtension == "jpeg") {
var imageReader = new FileReader();
imageReader.onload = function(e) {
$("#uploaded-image").attr("src", e.target.result);
$("#crop-profile-pic")[0].click();
};
imageReader.readAsDataURL(fileElement.files[0]);
return false;
}
else {
return false;
}
}在设置了src属性的值之后,它将打开lightbox (在id为crop-profile-pic的链接的单击事件上打开lightbox )。在lightbox中,它将显示页面crop-profile-pic.jsp。
jsp页面的主要代码:
Javascript代码:
<script type="text/javascript">
$(document).ready(function() {
if (!lightBoxNotOpened) {
jQuery(".jcrop-holder").remove();
jQuery("#target").attr("src", jQuery("#uploaded-image").attr("src"));//setting target image source
jQuery("#preview-pane .preview-container img").attr("src", jQuery("#uploaded-image").attr("src"));//setting target image source
// Create variables (in this scope) to hold the API and image size
var jcrop_api,
boundx,
boundy,
// Grab some information about the preview pane
$preview = $('#preview-pane'),
$pcnt = $('#preview-pane .preview-container'),
$pimg = $('#preview-pane .preview-container img'),
xsize = 165,
ysize = 165;
//console.log('init', [xsize, ysize]);
$('#target').Jcrop({
onChange: updatePreview,
onSelect: updatePreview,
aspectRatio: 1
}, function () {
// Use the API to get the real image size
var bounds = this.getBounds();
boundx = bounds[0];
boundy = bounds[1];
// Store the API in the jcrop_api variable
jcrop_api = this;
// Move the preview into the jcrop container for css positioning
//$preview.appendTo(jcrop_api.ui.holder);
});
}
else {
lightBoxNotOpened = false;
}
function updatePreview(c)
{
$('#imgX').val(c.x);
$('#imgY').val(c.y);
$('#imgW').val(Math.floor(c.w)-1);
$('#imgH').val(Math.floor(c.h)-1);
if (parseInt(c.w) > 0)
{
var rx = xsize / c.w;
var ry = ysize / c.h;
$pimg.css({
width: Math.round(rx * boundx) + 'px',
height: Math.round(ry * boundy) + 'px',
marginLeft: '-' + Math.round(rx * c.x) + 'px',
marginTop: '-' + Math.round(ry * c.y) + 'px'
});
}
}
});
function submitCropImageForm() {
document.cropImageForm.submit();
}
</script>original-image目录(图像id为target)和preview目录的HTML代码:
<div style="width:280px;height:280px;margin-left:5px;line-height:280px;border:1px solid black;text-align: center;">
<img src="/images/no-profile-pic.png" id="target" alt="Uploaded Image" />
</div>
<div id="preview-pane">
<div class="preview-container">
<img src="/images/no-profile-pic.png" id="preview-image" class="jcrop-preview" alt="Preview Thumbnail" />
</div>
</div>用于target的CSS:
#target {
max-height:280px;
max-width:280px;
height: auto!important;
width: auto!important;
}第一次选择图片时的截图:

在不刷新页面的情况下再次选择图像时的屏幕截图:

发布于 2016-07-23 21:12:40
我建议您在jcrop设置中设置框的宽度和高度,而不是使用css。我想这对你会有用的。
它应该看起来像这样
$('#cropbox').Jcrop({
boxWidth: 280, //Maximum width you want for your bigger images
boxHeight: 280, //Maximum Height for your bigger images
...
});https://stackoverflow.com/questions/20218547
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