Chrome 无法检测图片尺寸

Chrome not detecting image sizes

本文关键字:检测 Chrome      更新时间:2023-09-26

我正在尝试确保图像大于其查看宽度,然后在图像查看器中打开。但是,在 720p 分辨率和谷歌浏览器上,原始宽度和视口宽度的宽度都为 0......

下面是一个示例页面,其中图像应在BFX视图中打开(尝试在Chrome中以较低的分辨率打开):实时示例

日志(扫描的第一个图像是有问题的图像)

 Starting BFX View Version 0.3 Build 61 alpha
bfxcore.js:92 BFX View -> Looking for images in: .postpreview...
bfxcore.js:92 BFX View -> Looking for images in: .content...
bfxcore.js:109 Image: http://media-cache-ec0.pinimg.com/originals/ed/e1/c7/ede1c78fe16fba4afd1606772a5fc1ac.jpg Original Width: 0 Against: 0
bfxcore.js:109 Image: images/smilies/wink.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/smilies/smile.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/primus/blue/misc/quote_icon.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/primus/blue/buttons/viewpost-right.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/smilies/wink.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/smilies/smile.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/primus/blue/misc/quote_icon.png Original Width: 0 Against: 0
bfxcore.js:109 Image: images/primus/blue/buttons/viewpost-right.png Original Width: 0 Against: 0

JavaScript

$(function(){
    /****************************************************
    /    BFX View version 0.3 build 56
    /    by WASasquatch for BeeskneesFX.com
    /***************************************************/
    // Global vars
    var appname = 'BFX View',
        appflag = 'alpha',
        appversion = 0.3,
        appbuild = 61,
    // Selectors
        findImagesIn = new Array(
                    '.postpreview',
                    '.content',
                    '.restore',
                    '.postbody'
                    ), // Master container class/id - all image tags in children elements get selected
    // Theater selectors
        theater = $('#theater-box'),
        theaterimg = theater.find('#theater-img'),
        theaterclose = theater.find('#theater-header span');        
    console.log('Starting '+appname+' Version '+appversion+' Build '+appbuild+' '+appflag);
    if ( notMobile === false ) {
        console.log(appname+' detected a mobile device. Disabling BFX View for performance. Visit us on a desktop!');
    } else {
        // Start a BFX View selector
        for (i=0; i<findImagesIn.length; i++) {
            console.log(appname+' -> Looking for images in: '+findImagesIn[i]+'...');
            $(findImagesIn[i]).each(function(){
                bfxView('.'+$(this).attr('class'));
            });
        }
    }
    function bfxView(id) {
        var imgCount = 0;
        $(id).each(function(){ 
            $(this).find('img').each(function () {
                var img = $(this),
                    width, height, origWidth = $(this).width();
                    hiddenImg = img.clone().attr('class','').attr('id','').css('visibility', 'hidden').removeAttr('height').removeAttr('width').appendTo('#loading-images');
                height = hiddenImg.height();
                width = hiddenImg.width();
                hiddenImg.remove();
                console.log('Image: '+$(this).attr('src')+' Original Width: '+origWidth+' Against: '+width);
                if ( width > origWidth ) {
                    imgCount++;
                    $(this).css('cursor', 'pointer');
                    var parent = $(this).parent();
                    if ( parent.attr('href') == $(this).attr('src') ) {
                        parent.attr('target','_self');
                        parent.removeAttr('href');
                    }
                    $(this).click(function () {
                        var startingPoint = $(document).scrollTop(),
                            theaterActive = true,
                            bodyo = $('body').css('overflow');
                            $('body').css('overflow', 'hidden');
                        theaterimg.html('<img src="' + $(this).attr('src') + '" alt="Medium View" />');
                        setTimeout(function(){
                            theaterimg.find('img').each(function(){
                                var renderWidth = $(this).width();
                                if ( renderWidth < width ) {
                                    $(this).css('cursor', 'pointer');
                                    theater.find('#viewfull').attr('href', '/viewer.html?src='+Base64.encode($(this).attr('src'))+'&t='+Base64.encode(window.location.href));
                                    theater.on('click', '#theater-img img', function(){
                                        window.location.href = '/viewer.html?src='+Base64.encode($(this).attr('src'))+'&t='+Base64.encode(window.location.href);
                                    });
                                } else {
                                    theater.find('#viewfull').remove();
                                    $(this).attr('alt','Full Resolution View');
                                }
                            });
                        },0);
                        theater.fadeIn(1000, function () {
                            theaterclose.click(function () {
                                theater.fadeOut(1000, function() {
                                    theaterActive = false;
                                });
                                $('body').css('overflow', bodyo);
                            });
                        }); 
                    });
                }
            });
        });
        console.log(appname+' -> '+imgCount+' images found in '+id);
    }

});

我更改了搜索代码,旨在确保检查所有可能的类。用于开始搜索的旧代码是

        for (i=0; i<findImagesIn.length; i++) {
            console.log(appname+' -> Looking for images in: '+findImagesIn[i]+'...');
            bfxView(findImagesIn[i]);
        }

更新的代码仍然没有在Chrome上,并且在Firefox上通过此编辑损坏。这将告诉我"宽度"和"高度"没有定义,就像没有加载图像一样。

            $(this).find('img').each(function () {
                $(this).load(function(){
                    var img = $(this),
                        width, height, origWidth = $(this).outerWidth();
                        hiddenImg = img.clone().attr('class','').attr('id','').css('visibility', 'hidden').removeAttr('height').removeAttr('width').appendTo('#loading-images');
                    height = hiddenImg.height();
                    width = hiddenImg.width();
                    hiddenImg.remove();
                });

您的示例不起作用:

BFX View -> 0 images found in ...

无论如何,您正在尝试在加载图像之前读取宽度。看看这个问题的答案,它实际上涵盖了相同的主题:

使用 JavaScript 获取图像的真实宽度和高度?(在 Safari/Chrome 中)

对于大型图像,我建议使用读取图像尺寸的服务器端脚本,这样客户端就不必等待加载所有图像来触发脚本。

您需要为所有图像添加一个事件侦听器,并在加载它们>>后获取它们的边界。

img.onload = function () {
    // get width and height of the img refering to it using "this" keyword
}

如果您使用的是 JQuery

$(imgSelector).load(function(){
     // get width and height of the img refering to it using "$(this)"
}):