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如何在输入占位符内制作轮播转盘？

[英]How can I make a typing carousel inside an input placeholder?

 原文  2017-08-10 15:08:25  4   4    javascript/ jquery/ css/ placeholder

问题描述

我希望我的输入占位符有一个打字轮播，像这样

我希望在#myInput占位符上进行动态写入 

      <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>

关于如何做到这一点的任何想法？ 谢谢

4 个解决方案

解决方案1
 1 已采纳  2017-08-10 15:22:31

您实际上只需要使用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。 

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>

解决方案2
 0  2017-08-10 15:19:24

您链接到的示例使用CSS样式来模仿键入插入符号，因此您不能完全做到这一点，但否则可以使用完全相同的javascript，除了修改placeholder而不是内部的html之外输入的属性。 

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

显然，上面的方法静态地设置了占位符，但是没有理由不能使用提供的示例用于旋转占位符文本的setTimeout滴答策略。

至于插入符号，我只是使用“管”符号： | 。 它不是完美的，但是足够接近恕我直言。

解决方案3
 0  2017-08-10 15:32:56

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>

解决方案4
 0  2017-08-10 15:43:12

您可以重用TxtRotate，修改输入的占位符属性以及将插入符号效果添加到文本。 

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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