如何在输入占位符内制作打字轮播？

Question

我希望我的输入占位符有一个输入轮播，类似于 this

我希望 dynamic writing 在我的 #myInput 占位符上

      <div class="form-group">
        <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
      <center><label class="heypal-label"><span id="heypal">HeyPal<span class="gray-lighter">.me/</span></span></label>
        <input id="myInput" type="text" class="form-control conference-input">
        <button type="submit" class="btn btn-lg btn-danger btn-autosize">Go!</button></center>
      </div>
  </div>

关于如何完成此操作的任何想法？谢谢

Answer 1

您 link 使用 CSS 样式来模仿打字插入符的示例，因此您不能完全那样做，但除此之外您可以使用完全相同的 javascript您不是在修改跨度的内部 html，而是在修改输入的 placeholder 属性。

let input = document.getElementById("myInput");
input.placeholder = 'my text';

显然，上面的代码静态设置了占位符，但您没有理由不能使用提供的示例用于旋转占位符文本的 setTimeout 刻度策略。

至于插入符号，我只使用 'pipe' 符号：|。它并不完美，但恕我直言，已经足够接近了。

Answer 2

您真的只需要用您的输入元素和文本创建一个新的 TxtRotate 对象。

new TxtRotate(element, textArray, waitTimeMs);

然后，要在占位符中获取文本，只需在元素上设置占位符文本即可。

this.el.placeholder = this.txt;

var TxtRotate = function(el, toRotate, period) {
  this.toRotate = toRotate;
  this.el = el;
  this.loopNum = 0;
  this.period = parseInt(period, 10) || 2000;
  this.txt = '';
  this.tick();
  this.isDeleting = false;
};

TxtRotate.prototype.tick = function() {
  var i = this.loopNum % this.toRotate.length;
  var fullTxt = this.toRotate[i];

  if (this.isDeleting) {
    this.txt = fullTxt.substring(0, this.txt.length - 1);
  } else {
    this.txt = fullTxt.substring(0, this.txt.length + 1);
  }

  this.el.placeholder = this.txt;

  var that = this;
  var delta = 300 - Math.random() * 100;

  if (this.isDeleting) {
    delta /= 2;
  }

  if (!this.isDeleting && this.txt === fullTxt) {
    delta = this.period;
    this.isDeleting = true;
  } else if (this.isDeleting && this.txt === '') {
    this.isDeleting = false;
    this.loopNum++;
    delta = 500;
  }

  setTimeout(function() {
    that.tick();
  }, delta);
};

window.onload = function() {
  new TxtRotate(document.getElementById('myInput'), ["PariMaria", "GentianAnnas", "LinneaSteliana", "UlisesCristobal", "SimonidesLonny"], 2000);
};

<div class="form-group">
  <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
    <center><label class="heypal-label"><span id="heypal">HeyPal<span class="gray-lighter">.me/</span></span></label>
      <input id="myInput" type="text" class="form-control conference-input">
      <button type="submit" class="btn btn-lg btn-danger btn-autosize">Go!</button></center>
  </div>
</div>

Answer 3

你可以试试这个版本

<!DOCTYPE html>
<html>
<head>
<link href="https://fonts.googleapis.com/css?family=Raleway:200,100,400" rel="stylesheet" type="text/css" />
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<script>
var TxtRotate = function(el, toRotate, period) {
      this.toRotate = toRotate;
      this.el = el;
      this.loopNum = 0;
      this.period = parseInt(period, 10) || 2000;
      this.txt = '';
      this.tick();
      this.isDeleting = false;
    };

    TxtRotate.prototype.tick = function() {

      var i = this.loopNum % this.toRotate.length;
      var fullTxt = this.toRotate[i];

      if (this.isDeleting) {
        this.txt = fullTxt.substring(0, this.txt.length - 1);
      } else {
        this.txt = fullTxt.substring(0, this.txt.length + 1);
      }

      this.el.value =this.txt;

      var that = this;
      var delta = 300 - Math.random() * 100;

      if (this.isDeleting) { delta /= 2; }

      if (!this.isDeleting && this.txt === fullTxt) {
        delta = this.period;
        this.isDeleting = true;
      } else if (this.isDeleting && this.txt === '') {
        this.isDeleting = false;
        this.loopNum++;
        delta = 500;
      }

      setTimeout(function() {
        that.tick();
      }, delta);
    };

    window.onload = function() {
        var element = document.getElementById('myInput');
        var toRotate = element.getAttribute('data-rotate');
        var period = element.getAttribute('data-period');
         new TxtRotate(element, JSON.parse(toRotate), period);

      }


</script>
</head>
<body>
    <div class="form-group">
        <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
      <center><label class="heypal-label"><span id="heypal">HeyPal<span class="gray-lighter">.me/</span></span></label>
        <input id="myInput" type="text" class="form-control conference-input"

     data-period="2000"
     data-rotate='[ "nerdy.", "simple.", "pure JS.", "pretty.", "fun!" ]'>
        <button type="submit" class="btn btn-lg btn-danger btn-autosize">Go!</button></center>
      </div>
  </div>

</body>
</html>

Answer 4

您可以重复使用 TxtRotate，修改输入的占位符属性并为文本添加插入符效果。

var TxtRotate = function(el, toRotate, period) {
   this.toRotate = toRotate;
   this.el = el;
   this.loopNum = 0;
   this.period = parseInt(period, 10) || 2000;
   this.txt = '';
   this.tick();
   this.isDeleting = false;
};

TxtRotate.prototype.tick = function() {
var i = this.loopNum % this.toRotate.length;
var fullTxt = this.toRotate[i];

if (this.isDeleting) {
   this.txt = fullTxt.substring(0, this.txt.length - 1);
} else {
   this.txt = fullTxt.substring(0, this.txt.length + 1);
}

this.el.placeholder = this.txt + '|';

var that = this;
var delta = 300 - Math.random() * 100;

if (this.isDeleting) { delta /= 2; }

if (!this.isDeleting && this.txt === fullTxt) {
   delta = this.period;
   this.isDeleting = true;
} else if (this.isDeleting && this.txt === '') {
   this.isDeleting = false;
   this.loopNum++;
   delta = 500;
}

setTimeout(function() {
   that.tick();
  }, delta);
};

window.onload = function() {
   new TxtRotate(document.getElementById('myInput'), [ "nerdy.", "simple.", "pure JS.", "pretty.", "fun!" ], 2000);
};

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