javascript - jquery mobile 中的 jquery 动态字段

Question

我正在创建一个简单的动态表单，当用户按 2 时，将显示两个字段，如果他按 1，将显示 1 个字段

面临的问题: 如果用户输入 1 ，则显示 1 个字段，但如果用户删除 1 并按 2 而不是 1，则显示 3 个字段

HTML 代码

<label for="textarea2b">Quantity</label>
<input type="number" name="name2" id="quantitypickup" onkeyup="showdimension()" value="" data-clear-btn="true" placeholder="">
<div id="dimshow" class="row">

</div>

JS代码

function showdimension() {
    var q = $("#quantitypickup").val();
    var r = $("#dimshow");
    if (q == "0" || q == "" || q == null) {
        r.hide();
        r.html('');
    } else {
        r.show();
        for (var i = 0; i < q; i++) {
            r.append('  <div class="col-xs-6"><label>Item Name ' + (i + 1) + '</label><input type="text" name="name2" id="itemname" onkeyup="" value="" data-clear-btn="true" placeholder=""></div><div class="col-xs-6"><div class="row"><div class="col-xs-4"><label>Length</label><input type="number" name="name2"  onkeyup="" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div><div class="col-xs-4"><label>Width</label><input type="number" name="name2"  onkeyup="" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div><div class="col-xs-4"><label>Height</label><input type="number" name="name2" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div></div> </div></div>');
        }
    }
}

请帮忙

Answer 1

清除您的 html row每次用户通过 $('.row').html(''); 输入数字时

function showdimension() {
  $('.row').html('');
    var q = $("#quantitypickup").val();
    var r = $("#dimshow");
    if (q == "0" || q == "" || q == null) {
        r.hide();
        r.html('');
    } else {
        r.show();
        for (var i = 0; i < q; i++) {
            r.append('  <div class="col-xs-6"><label>Item Name ' + (i + 1) + '</label><input type="text" name="name2" id="itemname" onkeyup="" value="" data-clear-btn="true" placeholder=""></div><div class="col-xs-6"><div class="row"><div class="col-xs-4"><label>Length</label><input type="number" name="name2"  onkeyup="" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div><div class="col-xs-4"><label>Width</label><input type="number" name="name2"  onkeyup="" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div><div class="col-xs-4"><label>Height</label><input type="number" name="name2" value="" data-clear-btn="true" placeholder=""><label style="text-align:center">inches</label></div></div> </div></div>');
        }
    }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label for="textarea2b">Quantity</label>
<input type="number" name="name2" id="quantitypickup" onkeyup="showdimension()" value="" data-clear-btn="true" placeholder="">
<div id="dimshow" class="row">

</div>