使用jquery提取href标签的值

Question

<tr class="field_20 field_facebook">
<td class="label">Facebook</td>
<td class="data"><p><a href="http://facebook.com/facebook">Test</a></p>
</td></tr>
<img id="fb" src="fb.png">

Hello, so this is what I have and I want to select using jquery the value http://facebook.com/facebook and open the link. this is what I have so far:

<script>
jQuery(document).ready(function(){
jQuery("#fb").click(function() {
  var fb = jQuery(".field_20 field_facebook").find("a").attr("href");
window.open(fb);

}); //click function ends
}); // document ready ends
</script>

any help would be greatly appreciated thank you.

Answer 1

Use .field_20.field_facebook (no space, but a period).

The class attribute allows you to define multiple classes on the same element with a space. This is distinct from jQuery (and CSS) selectors where the space is a descendant selector. That is, .field_20 field_facebook tries to select a <field_facebook> element that is a descendant of an element with the .field_20 class. Using .field_20 .field_facebook would not work either because the descendant selector is still there. Omitting the space is proper syntax for selecting via multiple classes on the same element.

Answer 2

Try this as your jQuery script:

$(document).ready(function() {

    $("#fb").click(function() {
        var fb = $('td.data a').attr('href');
        alert(fb);
        window.open(fb);
    }); //click function ends

}); //END $(document).ready()

Answer 3

Your selector line can be simplified to:

var fb = jQuery(".field_20.field_facebook a").attr("href");

Just like in CSS, you can select the a which is a child of an element with class .field_20.field_facebook .

Answer 4

<tr class="field_20 field_facebook">

The classes are available on the same element.

So there should be no space between the 2 classes when used in the selector.

jQuery(".field_20.field_facebook")

Use the line below to access the facebook link

jQuery(".field_20.field_facebook a").attr("href");