Question

我正在尝试设置一个简单的脚本来切换复选框中的链接。

我下面的脚本有效，但它只会更改FIRST实例的href。

我确信这样做的方式可能更简单，因为我有很多冗余代码。

任何人都可以帮我解决这个问题吗？

谢谢！尼克

<script type="text/javascript">
function toggleLinks () {
    //instant attraction
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C1") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C15"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C15") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C1";

    //fashion bible
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C4") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C16"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C16") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C4";    

    //underground dating seminar
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C5") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C17"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C17") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C5";    

    //planning the perfect date
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C6") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C18"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C18") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C6";    

    //how to beat approach anxiety
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C7") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C19"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C19") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C7";    

    //interviews with naturals
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C8") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C20"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C20") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C8";    

    //crocodile style
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C9") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C21"; 
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C21") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C9";    

    //pheromone kids 10 minute seduction
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C10") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C22";    
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C22") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C10";   

    //joe natural uncensored
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C11") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C23";    
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C23") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C11";   

    //buzzy: master of threesomes
    if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C12") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C24";    
    else if (document.getElementById('add_to_cart').href == "http://bradp.com/dlg/sell.php?prodData=cb%2C24") document.getElementById('add_to_cart').href = "http://bradp.com/dlg/sell.php?prodData=cb%2C12";   

}
</script>

Answer 1

在HTML中，ID属性是唯一的。任何给定页面上只有一个元素具有相同的ID。

因此，document.getElementById只期望找到一个元素，因此只返回一个元素。您需要一个更复杂的设置来捕获所有链接，这些链接真的应该共享一个类，而不是ID。

你正在寻找的那种行为 - 获取元素集合并以这种方式对它们进行操作 - 可以通过类似jQuery之类的东西来实现，因为它会自动为你循环元素。否则，一旦你设法选择了你想要的所有元素，你就会自己做循环。

Answer 2

尝试遵守W3C标准，不要对多个元素使用相同的ID。

如果你真的必须这样做，请看看getElementsByTagName

Answer 3

您不应对多个元素使用相同的ID。请改用一个班级。一旦你这样做，你可以使用jQuery做这样的事情：

jQuery(".myClass").each(function() {
     this.href='...';
});

一个简单的javascript脚本变坏了！

3 个答案: