在处理用于工作目的的书签时遇到的一些奇怪设置遇到了一些麻烦。我需要它能够在页面上找到所有视频嵌入并处理信息以生成要插入我们的库设置中的JSON代码。问题是我无法可靠地获取处理数据所需的信息。
首先我在页面上找到所有div，并使用正确的itemprop
items = $('div[itemprop=video]');
然后使用$ .each（）开始处理
thumbnail = getThumb($(this).find('*[itemprop=thumbnailUrl]'));
filename = getFilename($(this).find('*[itemprop=contentUrl]'));
filelocation = getFilelocation( $(this).find('*[itemprop=contentUrl]'));
我需要能够获取thumbnailURL和contentURL进行处理，
function getFilename(gfn) {
if(gfn.prop('tagName') == 'META') {
gfname = gfn.prop('content');
} else {
gfname = gfn.attr('href');
}
x = gfname.lastIndexOf('/');
gfname = gfname.substr(x+1);
y = gfname.lastIndexOf('.');
gfname = gfname.substr(0,y);
return gfname;
}
.prop('tagName')不在元标记中时， undefined会一直返回itemprops，任何人都对如何运行此bookmarklet有任何想法？
Bookmarklets和源代码available here
编辑：因为有人提到我会继续将这个书签代码转储到这里，并删除多余的GIF
<a href="javascript:(function(){
var jQueryIsReady = function(){
if($('#vid2json_container').length < 1)
{
container = $(document.createElement('div'));
container.attr('id','vid2json_container');
container.css('position','fixed');
container.css('top','0');
container.css('left','0');
container.css('background-color','#222222');
container.css('padding','2px');
container.css('border-style','solid');
container.css('border-width','1px');
container.css('border-color','#000000');
container.css('opacity','0.95');
container.css('z-index','999997');
container.css('width','500px');
container.css('height',window.innerHeight);
container.css('overflow-y','auto');
container.css('overflow-x','hidden');
container.hide();
divider_01 = $(document.createElement('div'));
divider_01.css('clear','both');
logo = $(document.createElement('img'));
logo.attr('src','http://www.cityofdev.com/apps/bookmarklet/vid2json.png');
logo.css('float','left');
close_button = $(document.createElement('img'));
close_button.attr('src','http://www.cityofdev.com/apps/bookmarklet/close_button.jpg');
close_button.css('float','right');
close_button.bind('click',function(){
$('#vid2json_container').hide(500,function(){
$(this).remove();
});
});
output = $(document.createElement('div'));
output.attr('id','vid2json_output');
output.css('color','#ffffff');
container.append(logo);
container.append(close_button);
container.append(divider_01);
container.append(output);
$('body').prepend(container.show(500));
}
destination = $('#vid2json_output');
destination.html('');
items = $('div[itemprop=video]');
output = $(document.createElement('div'));
output.css('display','block');
output.css('padding','0 0 10px');
if(items.length > 0)
{
$.each(items,function(index,el){
title = $(this).find('*[itemprop=name]').attr('content');
thumbnail = getThumb($(this).find('*[itemprop=thumbnailUrl]'));
filename = getFilename($(this).find('*[itemprop=contentUrl]'));
filelocation = getFilelocation($(this).find('*[itemprop=contentUrl]'));
description = $(this).find('*[itemprop=description]').attr('content');
city = getCity();
citylink = getCitylink();
category = getCategory();
categorylink = getCategorylink();
duration = $(this).find('*[itemprop=duration]').attr('content');
head = $(document.createElement('span'));
head.html(title+' -> JSON<br />\n');
head.css('display','block');
head.css('font-weight','700');
head.css('font-size','12px');
textarea = $(document.createElement('textarea'));
textarea.css('width','100%');
textarea.css('height','300px');
textarea.css('margin','0 0 20px');
vCode = '';
vCode += ' {\n';
vCode += ' "title": "'+title+'",\n';
vCode += ' "thumbnail": "'+thumbnail+'",\n';
vCode += ' "filename": "'+filename+'",\n';
vCode += ' "filelocation": "'+filelocation+'",\n';
vCode += ' "description": "'+description+'",\n';
vCode += ' "city": "'+city+'",\n';
vCode += ' "citylink": "'+citylink+'",\n';
vCode += ' "category": "'+category+'",\n';
vCode += ' "categorylink": "'+categorylink+'",\n';
vCode += ' "duration": "'+duration+'",\n';
vCode += ' "height": "",\n';
vCode += ' "width": ""\n';
vCode += ' }\n';
textarea.val(vCode);
output.append(head);
output.append(textarea);
destination.append(output);
});
}else{
output.html('No Items Found');
destination.html(output);
}
scrollToTop = $(document.createElement('div'));
scrollToTop.html('Scroll To Top');
scrollToTop.css('cursor','pointer');
scrollToTop.bind('click',function(){
$('#vid2json_container').animate({ scrollTop: 0 },1000);
});
footer = $(document.createElement('div'));
footer.css('font-size','9px');
footer.css('color','#555555');
footer.css('padding','5px 0');
footer.html('VID2JSON bookmarklet programmed by David A Perez');
destination.append(scrollToTop);
destination.append(footer);
};
var checkJquery = function(){
if(typeof jQuery == 'undefined')
{
script01 = document.createElement('SCRIPT');
script01.src = 'http://code.jquery.com/jquery-1.9.1.min.js';
script01.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script01);
}else{
clearTimeout(interval);
jQueryIsReady();
}
};
var interval = setInterval(checkJquery,100);
function getCategorylink()
{
catl = location.href;
return catl;
}
function getCategory()
{
cat = $('.cat-header, .category-header').find('span, h1').html();
return cat.replace(/^( ){1,}|( ){1,}$/gi,'');
}
function getCitylink()
{
cl = location.href;
x = cl.indexOf('/',8);
return cl.substr(0,x);
}
function getCity()
{
c = $('title').html();
x = c.lastIndexOf('-');
c = c.substr(x+1);
y = c.lastIndexOf(',');
c = c.substr(0,y);
return c.replace(/^( ){1,}|( ){1,}$/gi,'');
}
function getFilelocation(gfl)
{
if(gfl.is('meta'))
{
gflocation = gfl.prop('content');
}else{
gflocation = gfl.attr('href');
}
x = gflocation.lastIndexOf('/');
gflocation = gflocation.replace(/www/gi,'ww');
gflocation = gflocation.substr(0,x+1);
gflocation = gflocation.replace(/[^\/]{1,}$/,'');
return gflocation.replace(/[\/]{2,}$/,'\/');
}
function getFilename(gfn)
{
if(gfn.is('meta'))
{
gfname = gfn.prop('content');
}else{
gfname = gfn.attr('href');
}
x = gfname.lastIndexOf('/');
gfname = gfname.substr(x+1);
y = gfname.lastIndexOf('.');
gfname = gfname.substr(0,y);
return gfname;
}
function getThumb(gt)
{
alert(gt.is('meta'));
if(gt.is('meta'))
{
gtname = gt.prop('content');
}else{
gtname = gt.attr('src');
}
num = gtname.lastIndexOf('/');
return gtname.substr(num+1);
}
})();">vid2json</a>
这应该作为书签运行，因此可以在其网站的任何页面上使用。它在网页加载后手动执行，加载jQuery，一旦准备就开始处理。似乎导致问题的部分是
$(this).find('*itemprop=ITEMPROP');
当itemprops在元标记中时它可以正常工作，但是在
的情况下<td class="ad" colspan="2" bgcolor="#000000" style="border:solid #CCCCCC 1px;">
<div itemscope itemtype="http://schema.org/LocalBusiness" style="color:#222222; font-weight: bold; text-align: center; width:580px;">
<div itemprop="video" itemscope itemtype="http://schema.org/VideoObject">
<meta itemprop="name" content="P.C.C.S. Dryer Vent Cleaning" />
<meta itemprop="duration" content="T1M20S" />
<meta itemprop="description" content="Fort Worth, TX dryer vent cleaning service." />
<meta itemprop="height" content="580" />
<meta itemprop="width" content="326" />
<a href="http://204.145.110.12/thecityoffortworth.com/videos/pccs-dryer-vent-cleaning.mp4" itemprop="contentURL" style="display:block;width:580px; height:326px; border:0px; margin-bottom:104px;" id="pccs">
<img src="pccs-dryer-vent-cleaning.png" alt="P.C.C.S. Dryer Vent Cleaning" width="580" height="430" border="0" itemprop="thumbnailURL" />
</a>
</div>
<a href="http://www.fortworthsweep.com" class="style5" target="_blank" rel="nofollow" itemprop="url" style="color:#ffffff">www.fortworthsweep.com</a>
</div>
它返回0项。我试过.find（'meta [itemprop = contentURL]，[itemprop = contentURL]'），但也返回0项。持有真的看起来像是一个标签，任何想法？
如果我做错了什么，我也会道歉，这是我第一次发布到Stackoverflow，而且我主要是用Javascript和jQuery自学。我正尽力学习什么是可能的，我可以做些什么来帮助你。感谢您的耐心和帮助！
答案 0 :(得分：2)
.prop('tagName')的一般概念正常，您可以在this jsFiddle中看到。问题更可能是你的jQuery对象是空的（例如选择器没有找到任何东西）。要查看这是否是您的问题，请检查jQuery对象上的.length属性。
此外，您没有向我们展示此代码的整体上下文。如果在解析页面之前执行它，那么这可能是您的jQuery对象为空的另一个原因。
根据jQuery documentation for .prop()：
它返回未定义的属性值的undefined 设置，或者匹配的集合没有元素。
由于始终设置tagName属性，因此更可能的问题是您的jQuery对象为空。
在你提供的链接页面中，我找不到在你的任何代码中设置断点的方法，所以我甚至不确定它是被调用/执行的。这似乎是由于您将大量代码放入javascript:链接而不是仅调用函数而引起的。
答案 1 :(得分：0)
jQuery有另一种测试元素是否是特定标记类型的方法，.is()方法：
if (gsn.is("meta"))
不确定为什么.prop调用未定义，除非gfn为空。
答案 2 :(得分：0)
找到解决方案！
它花了很长的时间来强制它检查所有内容，选择器和.find（）似乎没有得到我正在寻找的结果（可能是因为不一致的上限）但我终于设法让它上班了！
<a href="javascript:(function(){
var jQueryIsReady = function(){
if($('#vid2json_container').length < 1)
{
container = $(document.createElement('div'));
container.attr('id','vid2json_container');
container.css('position','fixed');
container.css('top','0');
container.css('left','0');
container.css('background-color','#222222');
container.css('padding','2px');
container.css('border-style','solid');
container.css('border-width','1px');
container.css('border-color','#000000');
container.css('opacity','0.95');
container.css('z-index','999997');
container.css('width','500px');
container.css('height',window.innerHeight);
container.css('overflow-y','auto');
container.css('overflow-x','hidden');
container.hide();
divider_01 = $(document.createElement('div'));
divider_01.css('clear','both');
divider_02 = $(document.createElement('div'));
divider_02.css('clear','both');
logo = $(document.createElement('img'));
logo.attr('src','http://www.cityofdev.com/apps/bookmarklet/vid2json.png');
logo.css('float','left');
close_button = $(document.createElement('img'));
close_button.attr('src','http://www.cityofdev.com/apps/bookmarklet/close_button.jpg');
close_button.css('float','right');
close_button.bind('click',function(){
$('#vid2json_container').hide(500,function(){
$(this).remove();
});
});
nak = $(document.createElement('img'));
nak.attr('id','naknak');
nak.attr('src', 'http://www.cityofdev.com/apps/bookmarklet/naknak.gif');
nak.css('float','left');
nak.css('width','143px');
nak.css('height','119px');
nak.css('z-index','99998');
salamander = $(document.createElement('img'));
salamander.attr('id','salamander');
salamander.attr('src', 'http://www.cityofdev.com/apps/bookmarklet/salamander.gif');
salamander.css('float','right');
salamander.css('width','112px');
salamander.css('height','117px');
salamander.css('z-index','99998');
output = $(document.createElement('div'));
output.attr('id','vid2json_output');
output.css('color','#ffffff');
container.append(logo);
container.append(close_button);
container.append(divider_01);
container.append(nak);
container.append(salamander);
container.append(divider_02);
container.append(output);
$('body').prepend(container.show(500));
}
destination = $('#vid2json_output');
destination.html('');
items = $('div[itemprop=video]');
output = $(document.createElement('div'));
output.css('display','block');
output.css('padding','0 0 10px');
if(items.length > 0)
{
$.each(items,function(index,el){
children = $(el).find('*');
$.each(children, function(i,ele){
n = $(ele);
if(n.attr('itemprop') !== undefined)
{
switch(n.attr('itemprop').toLowerCase())
{
case 'name':
title = n.attr('content');
break;
case 'contenturl':
filename = getFilename(n);
filelocation = getFilelocation(n);
break;
case 'thumbnailurl':
thumbnail = getThumb(n);
break;
case 'description':
description = n.attr('content');
break;
case 'duration':
duration = n.attr('content');
break;
default:
break;
}
}
});
city = getCity();
citylink = getCitylink();
category = getCategory();
categorylink = getCategorylink();
head = $(document.createElement('span'));
head.html(title+' -> JSON<br />\n');
head.css('display','block');
head.css('font-weight','700');
head.css('font-size','12px');
textarea = $(document.createElement('textarea'));
textarea.css('width','100%');
textarea.css('height','300px');
textarea.css('margin','0 0 20px');
vCode = '';
vCode += ' {\n';
vCode += ' "title": "'+title+'",\n';
vCode += ' "thumbnail": "'+thumbnail+'",\n';
vCode += ' "filename": "'+filename+'",\n';
vCode += ' "filelocation": "'+filelocation+'",\n';
vCode += ' "description": "'+description+'",\n';
vCode += ' "city": "'+city+'",\n';
vCode += ' "citylink": "'+citylink+'",\n';
vCode += ' "category": "'+category+'",\n';
vCode += ' "categorylink": "'+categorylink+'",\n';
vCode += ' "duration": "'+duration+'",\n';
vCode += ' "height": "",\n';
vCode += ' "width": ""\n';
vCode += ' }\n';
textarea.val(vCode);
output.append(head);
output.append(textarea);
destination.append(output);
});
}else{
output.html('No Items Found');
destination.html(output);
}
scrollToTop = $(document.createElement('div'));
scrollToTop.html('Scroll To Top');
scrollToTop.css('cursor','pointer');
scrollToTop.bind('click',function(){
$('#vid2json_container').animate({ scrollTop: 0 },1000);
});
footer = $(document.createElement('div'));
footer.css('font-size','9px');
footer.css('color','#555555');
footer.css('padding','5px 0');
footer.html('VID2JSON bookmarklet programmed by David A Perez');
destination.append(scrollToTop);
destination.append(footer);
};
var checkJquery = function(){
if(typeof jQuery == 'undefined')
{
script01 = document.createElement('SCRIPT');
script01.src = 'http://code.jquery.com/jquery-1.9.1.min.js';
script01.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script01);
}else{
clearTimeout(interval);
jQueryIsReady();
}
};
var interval = setInterval(checkJquery,100);
function getCategorylink()
{
catl = location.href;
return catl;
}
function getCategory()
{
cat = $('.cat-header, .category-header').find('span, h1').html();
return cat.replace(/^( ){1,}|( ){1,}$/gi,'');
}
function getCitylink()
{
cl = location.href;
x = cl.indexOf('/',8);
return cl.substr(0,x);
}
function getCity()
{
c = $('title').html();
x = c.lastIndexOf('-');
c = c.substr(x+1);
y = c.lastIndexOf(',');
c = c.substr(0,y);
return c.replace(/^( ){1,}|( ){1,}$/gi,'');
}
function getFilelocation(gfl)
{
if(gfl.length<1){return 'contentURL not found'+gfl.length;}
if(gfl.is('meta'))
{
gflocation = gfl.prop('content');
}else{
gflocation = gfl.attr('href');
}
x = gflocation.lastIndexOf('/');
gflocation = gflocation.replace(/www/gi,'ww');
gflocation = gflocation.substr(0,x+1);
gflocation = gflocation.replace(/[^\/]{1,}$/,'');
return gflocation.replace(/[\/]{2,}$/,'\/');
}
function getFilename(gfn)
{
if(gfn.length<1){return 'contentURL not found'+gfn.length;}
if(gfn.is('meta'))
{
gfname = gfn.prop('content');
}else{
gfname = gfn.attr('href');
}
x = gfname.lastIndexOf('/');
gfname = gfname.substr(x+1);
y = gfname.lastIndexOf('.');
gfname = gfname.substr(0,y);
return gfname;
}
function getThumb(gt)
{
if(gt.length<1){return 'thumbnailURL not found'+gt.length;}
if(gt.is('meta'))
{
gtname = gt.prop('content');
}else{
gtname = gt.attr('src');
}
num = gtname.lastIndexOf('/');
return gtname.substr(num+1);
}
})();">vid2json</a>
解决我遇到的问题
$.each(children, function(i,ele){
n = $(ele);
if(n.attr('itemprop') !== undefined)
{
switch(n.attr('itemprop').toLowerCase())
{
case 'name':
title = n.attr('content');
break;
case 'contenturl':
filename = getFilename(n);
filelocation = getFilelocation(n);
break;
case 'thumbnailurl':
thumbnail = getThumb(n);
break;
case 'description':
description = n.attr('content');
break;
case 'duration':
duration = n.attr('content');
break;
default:
break;
}
}
});
可能有更有效的方式来解决这个问题，但似乎可以做得足够可靠。我可能会在遇到情况时添加更多内容。感谢您的建议，它帮助我找到了解决方案！