Question

我一直在尝试在input type ='datetime-local'字段中添加占位符，但它根本不起作用。使用css解决问题但仍无法解决问题：（

			input[type="datetime-local"]:before{
    content: 'Selecteer Datum';
    color: #000;
    text-align: center;
    width:100%;
}
input[type="datetime-local"]:active:before, input[type="datetime-local"]:hover:before, input[type="datetime-local"]:visited:before,  input[type="datetime-local"]:focus:before{
    content: '';
    width: 100%;
}

<form action="" method="post">
    <div class="datetime">
        <input type="datetime-local"  >
    </div>
</form>

Answer 1

这是一个不太明智的想法，将输入类型更改为text，然后使用以下javascript将其转换为焦点上的datetime-local。

<input type="text" id="txtbox" placeholder="Heya">

<script>
  var dtt = document.getElementById('txtbox')
  dtt.onfocus = function (event) {
      this.type = 'datetime-local';
      this.focus();
  }
</script>

Answer 2

莎拉思丹尼尔是正确的。一个jQuery版本： http://jsfiddle.net/2e97L3d0/1/

HTML

<form action="" method="post">
<div class="datetime">
    <input type="text" id="datetime1" placeholder="Enter the starting date"  >
</div>

的Javascript

$(document).ready(function(){
$("#datetime1").focus( function() {
    $(this).attr({type: 'datetime-local'});
  });

}）;

Answer 3

我已经尝试过此解决方案在这里，我尝试获取YYYY-MM-DD HH：mm模式占位符y，您可以设置自己的格式只需更改值格式，数据日期格式并在js中添加模式即可。 HTML：

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.3/moment.min.js"></script>
<input type="datetime-local" data-date="" data-date-format="YYYY-MM-DD HH:mm" value="2000-01-01T00:00:00">

JS：

$("input").on("change", function() {
    this.setAttribute(
        "data-date",
        moment(this.value, "YYYY-MM-DD'T'HH:mm:ss")
        .format( this.getAttribute("data-date-format") )
    )
}).trigger("change")

CSS：

input {
    position: relative;
    width: 150px; height: 20px;
    color: white;
}

input:before {
    position: absolute;
    top: 3px; left: 3px;
    content: attr(data-date);
    display: inline-block;
    color: black;
}

input::-webkit-datetime-edit, input::-webkit-inner-spin-button, input::-webkit-clear-button {
    display: none;
}

input::-webkit-calendar-picker-indicator {
    position: absolute;
    top: 3px;
    right: 0;
    color: black;
    opacity: 1;
}

Answer 4

有点棘手，但它确实有效：

<强> HTML

<form action="" method="post">
    <div class="datetime">
        <input id="pholderInput" class="placeholder"  type="datetime-local">
    </div>
</form>

<强>的CSS：

.placeholder
{
  color: gray;
}

.focused
{
  color: black;
}

<强>使用Javascript：

var inp = document.getElementById("pholderInput");

var placeholderText = "default text";

inp.value = placeholderText;

inp.onfocus = function(e) {
    if (inp.value == placeholderText)
    {
        inp.value = "";
        inp.className = "focused";
    }
};

inp.onblur = function(e) {
    if (inp.value === "")
    {
        inp.value = placeholderText;
        inp.className = "placeholder";
    }
};

JSBin

如何添加占位符<input type =“datetime-local”/>字段？

4 个答案: