如何在clone()操作期间删除选定的元素 [英] How to remove the selected element during a clone() operation

问题描述

我有一个被克隆的选择框.我想从每个克隆的选择框中删除用户的先前选择.这是执行clone()的方法:

I have a select box that gets cloned. I want to remove the user's previous selection from each cloned select box. Here is the method that does the clone() :

function addselect(s){
   $('#product_categories > .category_block:last').after(
      $('#product_categories > .category_block:last').clone()
   );
   set_add_delete_links();
   return false;
}

function set_add_delete_links(){
    $('.remove_cat').show();
    $('.add_cat').hide();
    $('.add_cat:last').show();
    $("#product_categories > .category_block:only-child > .remove_cat").hide();
}

function removeselect(s){
    $(s).parent().remove(); 
    set_add_delete_links(); 
    return false;
}

这种方法有效，但不会删除最后选择的内容:

This kinda works but doesn't remove the last selected:

 $('#product_categories > .category_block:last option:selected').remove(); 

这是HTML

<div id="product_categories">
<div class="category_block">
    <select name="category_ids[]" id="cat_list">
        <option  value="">Select Attribute</option>
        <option  value="1770">Foo0</option>
        <option  value="1773">Foo1</option>
        <option  value="1775">Foo2</option>
        <option  value="1765">Foo3</option>
        <option  value="1802">Foo4</option>
        <option  value="1766">Foo5</option>
    </select>
    <input class="specsinput" type="text" name="specs[]" value="" />
    <a href="#" onClick="return removeselect(this);" class="remove_cat"> [-] </a>
    <a href="#" onClick="return addselect(this);" class="add_cat"> [+] </a>
</div>

推荐答案

您需要克隆适当的元素，为克隆设置选定的值，然后追加克隆.

You need to clone the proper element, set the selected value for the clone, then append the clone.

function addselect(s){

        // Store the block in a variable
    var $block = $('#product_categories > .category_block:last');

        // Grab the selected value
    var theValue = $block.find(':selected').val();

        // Clone the block 
    var $clone = $block.clone();

        // Find the selected value in the clone, and remove
    $clone.find('option[value=' + theValue + ']').remove();

        // Append the clone
    $block.after($clone); 

    set_add_delete_links(); return false;
}

更新:已修改为适合添加到问题中的HTML.

UPDATE: Modified to fit HTML added to question.

请注意，正在克隆选择元素的ID，这意味着您有2个具有相同ID的元素.这是不允许的.您需要删除该ID，或将克隆中的ID更改为其他值.

Please note, the ID of the select element is being cloned, which means you have 2 elements with the same ID. This is not allowed. You'll need to get rid of the ID, or change it in the clone to some other value.

在添加克隆之前，您可以执行以下操作:

You could do something like this before you append the clone:

    // Grab the select in the clone
var $select = $clone.find('select');

    // Update its ID by concatenating theValue to the current ID
$select.attr('id', $select.attr('id') + theValue);

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