Using jQuery on a string containing HTML
I'm trying to make a field similar to the facebook share box w开发者_JAVA技巧here you can enter a url and it gives you data about the page, title, pictures, etc. I have set up a server side service to get the html from the page as a string and am trying to just get the page title. I tried this:
function getLinkData(link) {
link = '/Home/GetStringFromURL?url=' + link;
$.ajax({
url: link,
success: function (data) {
$('#result').html($(data).find('title').html());
$('#result').fadeIn('slow');
}
});
}
which doesn't work, however the following does:
$(data).appendTo('#result')
var title = $('#result').find('title').html();
$('#result').html(title);
$('#result').fadeIn('slow');
but I don't want to write all the HTML to the page as in some case it redirects and does all sorts of nasty things. Any ideas? Thanks
Ben
Try using filter rather than find:
$('#result').html($(data).filter('title').html());
To do this with jQuery, .filter is what you need (as lonesomeday pointed out):
$("#result").text($(data).filter("title").text());
However do not insert the HTML of the foreign document into your page. This will leave your site open to XSS attacks. As has been pointed out, this depends on the browser's innerHTML implementation, so it does not work consistently.
Even better is to do all the relevant HTML processing on the server. Sending only the relevant information to your JS will make the client code vastly simpler and faster. You can whitelist safe/desired tags/attributes without ever worrying about dangerous ish getting sent to your users. Processing the HTML on the server will not slow down your site. Your language already has excellent HTML parsers, why not use them?.
When you place an entire HTML document into a jQuery object, all but the content of the <body> gets stripped away.
If all you need is the content of the <title>, you could try a simple regex:
var title = /<title>([^<]+)<\/title>/.exec(dat)[ 1 ];
alert(title);
Or using .split():
var title = dat.split( '<title>' )[1].split( '</title>' )[0];
alert(title);
The alternative is to look for the title yourself. Fortunately, unlike most parse your own html questions, finding the title is very easy because it doesn;t allow any nested elements. Look in the string for something like <title>(.*)</title> and you should be set.
(yes yes yes I know never use regex on html, but this is an exceptionally simple case)
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