Help with manipulating child/parent elements with jQuery

问题

Currently I have this JQuery script

var img = $(this);
img.wrap('<div class="photo"></div>');
img.parent().append("<p>" + img.attr("alt") + "</p>");

which successfully turns the following:

    <img src="photo.jpg" alt="caption">

into this

<div class="photo">
    <img src="photos.jpg" alt="caption"/>
        <p>caption</p>
</div>

All is well unless the image has a link as a parent; <a href="#"><img since I want it to be correct html (I'm fussy) improving the resulting outcome bellow would be satisfactory

<a href="#">
<div class="photo">
    <img src="photos.jpg" alt="caption"/>
        <p>caption</p>
</div>
</a>

to this:

<div class="photo">
    <a href="#">
    <img src="photos.jpg" alt="caption"/>
    </a>
        <p><a href="#">caption</a></p>
</div>

This is my jQuery script so far (which doesn't work bc I'm a noob) aha

if(img.parent('a')){
    var targetLink = img.parent('a').attr('href').val();
    img.parent('a').wrap('<div class="photo"></div>');
    img.parent('div').append('<p><a href="'+targetLink+'">' + img.attr("alt") + '</p></a>');
}else{
     img.wrap('<div class="photo"></div>');
     img.parent().append("<p>" + img.attr("alt") + "</p>");
};

Any advice, or help will be greatly appreciated : )
Thank You!

Update Answer

var withLink = img.parent('a').length > 0,
targetPar = withLink ? img.parent() : img;

targetPar.wrap('<div class="photo"></div>');

if(withLink > 0){
    targetPar.parent().append('<p class="caption"><a href="'+img.parent().attr('href')+'">' + img.attr('title') + '</p></a>');
}else{
    img.parent().append('<p class="caption">' + img.attr('title') + '</p>');
}

回答1:

I think the problem is your "if" statement, which should be:

if (img.parent('a').length) {
  // ...
}

Then, when you try to get the "href" of the <a> tag, you're calling "val()" and that's not necessary (or correct, even):

  var targetLink =  img.parent('a').attr('href');

Also, though not relevant to your problem, the "alt" attribute is supposed to describe what the image is about, while the "title" is more like what I'd call a "caption". In other words, the "alt" text should be understandable to people who can't see the image at all, while the "title" describes an image to a person who can see it. Just a nit.;

回答2:

I would do it this way:

var img = $(this);
var target = $(img).parent();
if (target.is("a")) {
  target = target.parent();
}
target.wrap("<div>");
var div = target.parent();
div.addClass("photo");
$("<p>").attr("alt", $(img).attr("alt")).appendTo(div);

Some browsers are exceptionally slow at using innerHTML type methods for markup creation so I tend to favour the above approach, which uses diretc DOM element creation. To clarify, as of jQuery 1.4+ at least: