我希望我的输入占位符有一个打字轮播，像这样
我希望在我的#myInput占位符上动态书写
<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
你实际上只需要用你的输入元素和文本创建一个新的TxtRotate对象。
new TxtRotate(element, textArray, waitTimeMs);
然后，要获取占位符中的文本，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>您链接到的示例使用 CSS 样式来模仿键入插入符号，因此您无法完全做到这一点，但除此之外，您可以使用完全相同的 JavaScript，除了修改输入的placeholder属性，而不是修改 span 的内部 html。
let input = document.getElementById("myInput");
input.placeholder = 'my text';
显然，上述设置占位符是静态的，但没有理由不能使用与提供的示例相同的setTimeout勾策略来旋转占位符文本。
至于插入符号，我只使用"管道"符号：|。它并不完美，但恕我直言，它已经足够接近了。
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>
您可以重复使用 TxtRotate，修改输入的占位符属性，并向文本添加插入符号效果。
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);
};