To make an action based on the link location by jQuery

问题

How can you retrieve the value of the rel attribute of a given link and pass it to the handler?

I have a list of links such that

Link list

<div id='one_answer'>Answer1
    <a href="$" class="delete_answer" rel='Answer1'>delete</a>
</div>
<div id='one_answer'>Answer2
    <a href="$" class="delete_answer" rel='Answer2'>delete</a>
</div> 
<div id='one_answer'>Answer3
    <a href="$" class="delete_answer" rel='Answer3'>delete</a>
</div>

These links are generated by the following code. The following value of the rel does not seem to be passed to the handler.

Links generated by PHP

    echo ($answer . "<a href='#'"                                                                                                                  
        . "class='delete_answer'"
        . " rel='" . $body . "'"         // I identify the answer
                                         // by the body of the answer
                                         // in the database
        . ">delete</a>"
    );

The user clicks the second link. The rel attribute should pass the answer to the handler. jQuery should perform the following action based on the POST -data.

jQuery

jQuery('a.delete_answer').live('click', function(){
    jQuery.post('/codes/handlers/delete_an_answer.php', 
        { delete_answer: jQuery(this).attr('rel') },    
        function(){
            $("#one_answer").removeClass("yellow");
        })
});

The file delete_an_answer.php

$dbconn = pg_connect("host=localhost port=5432 dbname=masi user=masi password=123");
// remove the answer
$result = pg_query_params ( $dbconn,                                                                                                                                                                           
    'DELETE FROM answers 
    WHERE answer = $1',
    array ($_POST['answer'] )    // Problem here, because
                                 // $_POST['answer'] is empty when it gets here
                                 // so no answer is deleted
);

I fetch answers from Postgres and put at the same time the value of the rel attribute to be $body.

回答1:

I can see several problems with this code:

You have more than one <div id='one_answer'>. IDs should be unique, so $("#one_answer").removeClass("yellow"); will always select the first div, not all divs.
delete_an_answer.php - In the php you're looking for $_POST['answer'], but the ajax has {question_id: jQuery(this).attr('rel')}.
The links in your sample don't have a rel, and href='$', which is weird. Also <div id='one_answer> is broken, should be another single quote. I assume these are copy-paste problems.

回答2:

Ok, well... To answer your first question, you can get the index of the element that was clicked within the array of elements matching a given selector using jQuery's index() method:

$('a.delete_answer').live('click', function()
{
  var index = $("a.delete_answer").index(this);
  // index will be 0 for the first matching link, 
  // 1 for the second, and so on. Do what you will with this...
  ...
});

As for the rest of your question, I really have no idea what it is you're asking.

来源：https://stackoverflow.com/questions/1350539/to-make-an-action-based-on-the-link-location-by-jquery

标签

php

jquery

find

hyperlink