为动态字段分配增量值

时间:2013-12-05 18:44:52

标签: javascript jquery

我有一个从jquery函数生成的动态输入字段。可以通过按钮单击这些输入字段来添加或删除。这些字段填充了mysql表中的数据。每个填充的输入都具有从DB获取的唯一ID。添加新字段时,我将从ajax请求中获取下一个AUTO_INCREMENT。然后我可以增加+1但是对于所有字段。我只想为新字段做这个。如果由于某种原因,从另一个应用程序进行插入查询事务,它将更新start increment from字段,然后使用正确的值更新其余部分(检查我的意思是jsFiddle(http://jsfiddle.net/f9XP8/2/)。

问题是如何把它们放在一起。我只想跟随能够添加一个新字段并为db插入分配适当的下一个person_idLIVE EXAMPLE

<script>
$(document).ready(function () {
    var $increment_num = $('#increment_num');
    var interval = 100;  //3000 = 3 seconds
    function doAjax() {
        $.ajax({
            type: 'POST',
            url: 'personAutoIncrement.php',
            data: $(this).serialize(),
            dataType: 'json',
            success: function (data) {
                    var $cloned = $('#input_table tr');
                    var num = parseInt(data);
                    $increment_num.val(num);
                    $cloned.each(function(i){
                        $(this).find('[name^="increment_id"]').first().val(num+i);
                    })
            },
            complete: function (data) {
                // Schedule the next
                setTimeout(doAjax, interval);

        }
    });
    }
    setTimeout(doAjax, interval);
    var click_count = 0;
    $('#btnAdd').click(function () {
    click_count++;
        var $clones     = $('#input_table tr'),
            num         = $clones.size() + 1,
            next_num    = parseInt($clones.last().find('input[name^="increment_id"]').val()) + 1,
            $template   = $clones.first(),
            newSection  = $template.clone().attr('id', 'pq_entry_'+num),
            ident       = 'increment_id_'+num;
            person_id = 'person_id_'+num;
            person_fname = 'person_fname_'+num;
            person_lname = 'person_lname_'+num;

        // clear out all sections of new input
        newSection.find('input').not('[name^="increment_id"]').val('');

        newSection.find('input[name^="increment_id"]').attr({
            'id': ident,
            'name': ident
        }).val(/*next_num*/);
        newSection.find('input[name^="person_id"]').attr({
            'id': person_id,
            'name': person_id
        }).val(/*next_num*/);
        newSection.find('input[name^="person_fname"]').attr({
            'id': person_fname,
            'name': person_fname
        }).val(/*next_num*/);


        $('#input_table').append(newSection);
        $('#btnDel').prop('disabled', '');
        if (num == 100) $('#btnAdd').prop('disabled', 'disabled');
    });

    $('#btnDel').click(function () {
        var num = $('.clonedSection').length; // how many duplicate input fields we currently have
        $('#pq_entry_' + num).remove(); // remove the last element

        // enable the "add" button
        $('#btnAdd').prop('disabled', '');

        // if only one element remains, disable the "remove" button
        if (num - 1 == 1) $('#btnDel').prop('disabled', 'disabled');
    });

    $('#btnDel').prop('disabled', 'disabled');
});
</script>

HTML

<table>
    <thead>
        <tr>
            <th>ID from DB</th>
            <th>First Name</th>
        </tr>
    </thead>
    <tbody id="input_table">
        <tr id="pq_entry_1">
            <td><input type="text" id="increment_id_1" name="increment_id_1" readonly value="5" /></td>
            <td><input type="text" name="first_name" placeholder="First Name" /></td>
        </tr>
    </tbody>
</table>
<input type='button' id='btnAdd' value='add text box' />
<input type='button' id='btnDel' value='Delete' /></br>
</table>

enter image description here

1 个答案:

答案 0 :(得分:4)

如果我没有弄错,你想要知道如何增加某些行,但允许其他行“冻结”(因为它们被保存到数据库中)。我已经更改了你的代码,这里有重要的注意事项:

  1. 我删除了动态名称属性。您不需要动态生成字段名称,您只需指定data- *属性来保存ID或引用tr.find('input[name="person_id"]')
  2. data-saved添加了tr属性,以了解它是否应包含在更新的auto increment id中,或者是否应该保持原样
  3. 在每行旁边添加了一个保存按钮,因为它只是在行上设置data-saved属性,如果需要,可以添加一个AJAX调用来保存记录
  4. Updated Fiddle

    Javascript:

    $(document).ready(function () {
        var $increment_num = $('#increment_num');
        var interval = 5000;  //3000 = 3 seconds
        function doAjax() {
            $.ajax({
                type: 'POST',
                url: 'personAutoIncrement.php',
                data: $(this).serialize(),
                dataType: 'json',
                success: function (data) {
                    var $cloned = $('#input_table tr').not('[data-saved]');
                    var num = parseInt(data);
                    $increment_num.val(num);
                    $cloned.each(function(i){
                        var $this = $(this);
                        $this.find('[name^="person_id"]').first().val(num+i);
                    })
                },
                complete: function (data) {
                    // Schedule the next
                    setTimeout(doAjax, interval);
                }
            });
        }
        setTimeout(doAjax, interval);
        var click_count = 0;
    
        $('#btnAdd').click(function () {
            click_count++;
            var $clones     = $('#input_table tr'),
                num         = $clones.size() + 1,
                next_num    = parseInt($clones.last().find('input[name^="person_id"]').val()) + 1,
                $template   = $clones.first(),
                newSection  = $template.clone().attr('id', 'pq_entry_'+num),
                person_id   = 'person_id_'+num;
                person_fname = 'person_fname_'+num;
                person_lname = 'person_lname_'+num;
    
            newSection.removeAttr('data-saved');
    
            // clear out all sections of new input
            newSection.find('input[type="text"]').val('');
    
            newSection.find('input[name^="person_id"]').attr({
                'id': person_id
            }).val(next_num);
    
            newSection.find('input[name^="person_fname"]').attr({
                'id': person_fname
            });
    
            newSection.find('input[type="button"]').attr('data-ident', next_num);
    
    
            $('#input_table').append(newSection);
            $('#btnDel').prop('disabled', '');
            if (num == 100) $('#btnAdd').prop('disabled', 'disabled');
        });
    
        $('.save-button').click(function(){
            var $parent = $(this).parents('.clonedSection')
            var id = $parent.find('input[name="person_id"]').val();
            // do whatever else here, save to db
            $parent.attr('data-saved', '1');
        })
    
        $('#btnDel').click(function () {
            var num = $('.clonedSection').length; // how many duplicate input fields we currently have
            $('#pq_entry_' + num).remove(); // remove the last element
    
            // enable the "add" button
            $('#btnAdd').prop('disabled', '');
    
            // if only one element remains, disable the "remove" button
            if (num - 1 == 1) $('#btnDel').prop('disabled', 'disabled');
        });
    
        $('#btnDel').prop('disabled', 'disabled');
    });
    

    HTML:

    <form>
    <strong>Start Increment from Next ID to be inserted in the DB:</strong><input id="increment_num" name="increment_num"  type="text" /></br>
    <table>
        <thead>
            <tr><th>ID from DB</th><th></th>
            <th>First Name</th></tr>
        </thead>
        <tbody id="input_table" >
            <tr id="pq_entry_1" class="clonedSection" data-saved="1">
                <td><input type="text" name="person_id" value='1' readonly /></td>
                <td><input id="person_fname_1" name="person_fname" placeholder=" First Name" type="text" value='James'/></td>
                <td><input type="button" class="save-button" value="Save" />
            </tr>
            <tr id="pq_entry_2" class="clonedSection" >
                <td><input type="text" name="person_id" value='2' readonly /></td>
                <td><input id="person_fname_2" name="person_fname" placeholder=" First Name" type="text" value='Cynthia'/></td>
                <td><input type="button" class="save-button" value="Save" />
            </tr>
        </tbody>
    </table>
    <input type='button' id='btnAdd' value='add another Person' />
    <input type='button' id='btnDel' value='Delete' /></br>
    </form>
    

    说完所有这些之后,我可能会通过隐藏元素来解决这个问题:

    <input type="hidden" name="person_id" value="1" />

    生成新行时无效:

    <input type="hidden" name="person_id" value="" />

    然后在我的PHP中,我将允许MySQL以这样的方式处理自动递增id:

    <?php
        $params = $_POST;
        if(is_numeric($params['person_id'])){
           $sql = sprintf('UPDATE person SET fname = "%s", lname = "%s" WHERE person_id = %u LIMIT 1', 
              mysql_real_escape_string($params['fname']), 
              mysql_real_escape_string($params['lname']), 
              intval($params['person_id'])
           );
        } else {
           // the NULL tells MySQL to select the correct next increment id automatically
           $sql = sprintf('INSERT INTO person (id, fname, lname) VALUES (NULL, "%s", "%s")',
             mysql_real_escape_string($params['fname']),
             mysql_real_escape_string($params['lname']);
           );
        }
    
    ?>