如何在输入后保持浮动标签浮动。纯CSS

问题描述 投票：1回答：3

当聚焦时，我已经成功地将标签浮动在表单输入字段之上，但是如果文本输入到字段中并且未聚焦，我会对如何保持标签浮动感到困惑。

在线有大量的纯CSS示例，但没有一个对我来说很明显是什么让填充的字段标签浮动。我相信这很容易，但我对此很新。

编辑：我需要这样做而不使用下面评论中提到的“必需”方法。我的表单是必填字段和非必填字段的组合。

以下是我发现的众多例子之一：http://codepen.io/atunnecliffe/pen/gpKzQw

这是我的jsfiddle：https://jsfiddle.net/yzzxrsnn/1/

提前谢谢了。

HTML：

<fieldset class="form-field">
<textarea maxlength="280" class="form-textarea"></textarea>
<label class="form-label" alt='Search Map' placeholder='Search Map'>Text Area</label>
<br>
<input type='text'  class="form-input" placeholder="" onclick='this.value = "";'>
<label class="form-label" alt='Search Map' placeholder='Search Map'>Text</label>
<br>
<select class="form-input" >
    <option value="" disabled selected hidden></option>
    <option value="AL">Alabama</option>
    <option value="AK">Alaska</option>
    <option value="AZ">Arizona</option>
    <option value="AR">Arkansas</option>
    <option value="CA">California</option>
</select>
<label class="form-label" for="name">Select</label>
</fieldset>

CSS：

.form-input {
    box-sizing: border-box;
    width: 100%;
    max-width: 400px;
    height: 55px;
    margin: 15px 0 15px 0;
    padding: 0px 10px 0px 10px;
    border: 3px solid #ccc;
  outline: none;
    border-radius: 8px;
    outline: none;
  resize: none;
    text-align:left;
    -webkit-appearance: none;
    background: transparent;
    font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #000;
  background:#fff;
    font-size: 18px;
    -webkit-transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
    transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
}

.form-input:focus {
  border-color: #00bafa;
}

.form-input + .form-label {
    display: block;
    pointer-events: none;
  margin:  0 0 0 15px;
    line-height: 0px;
    margin-top: -43px;
    margin-bottom: 43px;
  transition: transform 1s;

}

.form-label {
  font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #ccc;
    font-size: 18px;
}

.form-input:focus + .form-label {
  transform: translateY(-38px);
  font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #00bafa;
    font-size: 18px;
}

.form-textarea {
    box-sizing: border-box;
    width: 100%;
    max-width: 400px;
    height: 150px;
    margin: 15px 0 15px 0;
    padding: 15px 10px 0px 10px;
    border: 3px solid #ccc;
    border-radius: 8px;
    outline: none;
  resize: none;
    text-align:left;
    -webkit-appearance: none;
    background: transparent;
    font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #000;
  background:#fff;
    font-size: 18px;
    -webkit-transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
    transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
}

.form-textarea:focus {
  border-color: #00bafa;
}

.form-textarea + .form-label {
    display: block;
    pointer-events: none;
  margin:  0 0 0 15px;
    line-height: 0px;
    margin-top: -145px;
    margin-bottom: 145px;
  transition: transform 1s;
}

.form-textarea:focus + .form-label {
  transform: translateY(-30px);
  font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #00bafa;
    font-size: 18px;
}

.form-textarea + .form-label:before {
  transform: translateY(-38px);
  pointer-events: none;
  font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #00bafa;
    font-size: 18px;
}
html css html5 forms css3
3个回答
2
投票

您可以使用jquery执行此操作。使用jquery，我们可以将类添加到输入，如果该输入的值大于0，则为标签。

$(document).ready(function() {
    var $input = $('.form-input');

    $input.focusout(function() {
        if($(this).val().length > 0) {
            $(this).addClass('input-focus');
            $(this).next('.form-label').addClass('input-focus-label');
        }
        else {
        $(this).removeClass('input-focus');
            $(this).next('.form-label').removeClass('input-focus-label');

        }
    });
});

和一些CSS

.input-focus-label{
    transform: translateY(-38px);
    font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
    color: #00bafa;
    font-size: 18px;
}
.input-focus{
    border-color: #00bafa;
}

这是一个例子fiddle.Hope这对你有所帮助。

1
投票

如果为输入元素设置required，则可以利用:valid选择器：

        .form-input {
            box-sizing: border-box;
            width: 100%;
            max-width: 400px;
            height: 55px;
            margin: 15px 0 15px 0;
            padding: 0px 10px 0px 10px;
            border: 3px solid #ccc;
            outline: none;
            border-radius: 8px;
            outline: none;
            resize: none;
            text-align: left;
            -webkit-appearance: none;
            background: transparent;
            font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
            color: #000;
            background: #fff;
            font-size: 18px;
            -webkit-transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
            transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
        }

            .form-input:focus {
                border-color: #00bafa;
            }

            .form-input + .form-label {
                display: block;
                pointer-events: none;
                margin: 0 0 0 15px;
                line-height: 0px;
                margin-top: -43px;
                margin-bottom: 43px;
                transition: transform 1s;
            }

        .form-label {
            font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
            color: #ccc;
            font-size: 18px;
        }

        .form-input:focus + .form-label, .form-input:valid + .input-label, .form-input:valid + .dropdown-label {
            transform: translateY(-38px);
            font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
            color: #00bafa;
            font-size: 18px;
        }

        .form-textarea {
            box-sizing: border-box;
            width: 100%;
            max-width: 400px;
            height: 150px;
            margin: 15px 0 15px 0;
            padding: 15px 10px 0px 10px;
            border: 3px solid #ccc;
            border-radius: 8px;
            outline: none;
            resize: none;
            text-align: left;
            -webkit-appearance: none;
            background: transparent;
            font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
            color: #000;
            background: #fff;
            font-size: 18px;
            -webkit-transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
            transition: border-color ease-in-out .5s,box-shadow ease-in-out .5s;
        }

            .form-textarea:focus {
                border-color: #00bafa;
            }

            .form-textarea + .form-label {
                display: block;
                pointer-events: none;
                margin: 0 0 0 15px;
                line-height: 0px;
                margin-top: -145px;
                margin-bottom: 145px;
                transition: transform 1s;
            }

            .form-textarea:focus + .form-label, .form-textarea:valid + .textarea-label {
                transform: translateY(-38px);
                font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
                color: #00bafa;
                font-size: 18px;
            }

            .form-textarea + .form-label:before {
                transform: translateY(-38px);
                pointer-events: none;
                font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
                color: #00bafa;
                font-size: 18px;
            }
    <fieldset class="form-field">
        <textarea maxlength="280" class="form-textarea" required></textarea>
        <label class="form-label textarea-label" alt='Search Map' placeholder='Search Map'>Text Area</label>
        <br>
        <input type='text' class="form-input" placeholder="" onclick='this.value = "";' required>
        <label class="form-label input-label" alt='Search Map' placeholder='Search Map'>Text</label>
        <br>
        <select class="form-input" required>
            <option value="" disabled selected hidden></option>
            <option value="AL">Alabama</option>
            <option value="AK">Alaska</option>
            <option value="AZ">Arizona</option>
            <option value="AR">Arkansas</option>
            <option value="CA">California</option>
            <option value="CO">Colorado</option>
            <option value="CT">Connecticut</option>
            <option value="DE">Delaware</option>
            <option value="DC">District Of Columbia</option>
            <option value="FL">Florida</option>
            <option value="GA">Georgia</option>
            <option value="HI">Hawaii</option>
            <option value="ID">Idaho</option>
            <option value="IL">Illinois</option>
            <option value="IN">Indiana</option>
            <option value="IA">Iowa</option>
            <option value="KS">Kansas</option>
            <option value="KY">Kentucky</option>
            <option value="LA">Louisiana</option>
            <option value="ME">Maine</option>
            <option value="MD">Maryland</option>
            <option value="MA">Massachusetts</option>
            <option value="MI">Michigan</option>
            <option value="MN">Minnesota</option>
            <option value="MS">Mississippi</option>
            <option value="MO">Missouri</option>
            <option value="MT">Montana</option>
            <option value="NE">Nebraska</option>
            <option value="NV">Nevada</option>
            <option value="NH">New Hampshire</option>
            <option value="NJ">New Jersey</option>
            <option value="NM">New Mexico</option>
            <option value="NY">New York</option>
            <option value="NC">North Carolina</option>
            <option value="ND">North Dakota</option>
            <option value="OH">Ohio</option>
            <option value="OK">Oklahoma</option>
            <option value="OR">Oregon</option>
            <option value="PA">Pennsylvania</option>
            <option value="RI">Rhode Island</option>
            <option value="SC">South Carolina</option>
            <option value="SD">South Dakota</option>
            <option value="TN">Tennessee</option>
            <option value="TX">Texas</option>
            <option value="UT">Utah</option>
            <option value="VT">Vermont</option>
            <option value="VA">Virginia</option>
            <option value="WA">Washington</option>
            <option value="WV">West Virginia</option>
            <option value="WI">Wisconsin</option>
            <option value="WY">Wyoming</option>
        </select>
        <label class="form-label dropdown-label" for="name">Select</label>
    </fieldset>
0
投票

这是一个快速而肮脏的edit on your fiddle

<fieldset class="form-field">
<input type='text'  class="form-input" placeholder=""  required onclick='this.value = "";'>
<label class="form-label" alt='Search Map' placeholder='Search Map'>Text</label>
</fieldset>

而对于CSS：

.form-input:focus + .form-label,
.form-input:valid + .form-label {
transform: translateY(-38px);
font-family: 'Yanone Kaffeesatz', Arial, sans-serif;
color: #00bafa;
font-size: 18px;
}

基本上，通过添加:valid到你的领域，利用:focus与required重合

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