Question

我有以下播放列表行，这些行已存在于播放列表中

<div class="total-row">
    <div class="total-title" src="music/04_LCR_Mae_Terra.mp3">04_LCR_Mae_Terra</div>
</div>
<div class="total-row">
    <div class="total-title" src="music/06LCR_Homem_Mal.mp3">06LCR_Homem_Mal</div>
</div>
<div class="total-row">
    <div class="total-title" src="music/06LCR_Homem_Mal.mp3">06LCR_Homem_Mal</div>
</div>

还有我在播放列表中添加歌曲的链接

<div id="playlinks">
    <li mp3="music/04_LCR_Mae_Terra.mp3" class="add_link"></li>
    <li mp3="music/05_LCR_Jack_Matador.mp3" class="add_link"></li>
</div>

所以我将匹配所选（点击）链接的mp3链接与播放列表中已存在的链接（我将匹配所有行），如果已经存在那么它不会添加，如果不存在则添加所选的一个。我正在使用以下jquery代码

if i use the below code

$(document).on("click", ".add_link", function(){

    var mp3 = $(this).attr("mp3");
    var foundInPlaylist =
      $(".total-row .total-title[src$='"+ ('/'+mp3) +"']").length;
     if(foundInPlaylist){
        alert("found");
     } else{
       alert("not found");
     }
});

即使我只是写警报（foundInPlaylist），这也行不通;它警告“0”;

if i use the second solution

$(".add_link").click(function () {
var newMp3 = $(this).attr("mp3");
var exists = false;
$(".total-row").each(function(){
    var oldmp3 = $(this).children(".total-title").attr("src");
    if(oldmp3.indexOf(newMp3) > 0 )
    {
        exists = true
    }
});
if(exists)
{
    alert("song already exists");
}
else {
        alert("song does not exist");
    }
});

它也不适合我

由于

Answer 1

也许您可以尝试使用jQuery“属性以”$("[attribute$='value']")结尾：

http://api.jquery.com/attribute-ends-with-selector/

小提琴中的快速示例：http://jsfiddle.net/KRnWR/2/

// http://api.jquery.com/on/
$(document).on("click", ".add_link", function(){

    var mp3 = $(this).attr("mp3");

    // http://api.jquery.com/attribute-ends-with-selector/
    var foundInPlaylist =
      $(".total-row .total-title[src$='"+ ('/'+mp3) +"']").length;

    // for (brain)killing programmers :)
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/if...else
    if( foundInPlaylist ){
      alert( mp3 + ' found in playlist.');
    }else{
      alert( mp3 + ' not found in playlist.');
    }
});

我在mp3的文件名之前添加'/'以防止这样的错误匹配：

          mp3="lala.mp3">
src="music/lalalala.mp3">

Answer 2

请尝试以下代码：

$(".add_link").click(function () {
var newMp3 = $(this).attr("mp3");
var exists = false;
$(".total-row").each(function(){
    var oldmp3 = $(this).children(".total-title").attr("src");
    if(oldmp3.indexOf(newMp3) > -1 )
    {
        exists = true
    }


});
if(exists)
{
    alert("song already exists");
}
else {
        alert("song does not exist");
    }
});

这是工作示例：

http://jsfiddle.net/YW46k/

检查所选链接是否与多个给定链接匹配

2 个答案: