我有这样的输入:
<input value="My text" placeholder="Placeholder">
当我在输入中输入内容时,占位符文本将消失,这很明显。
现在,我想要做的是我希望占位符文本在用户输入时保留,以便您可以将占位符文本视为原始文本背后的背景文本:
编辑:我也希望能够使用JavaScript更改背景文本。
答案 0 :(得分:10)
很难想到这种行为的良好用法,因为它会阻止一些用户输入。
一种简单的方法是使用input::after
,但目前任何浏览器都不支持此功能(感谢@ JukkaK.Korpela)。
但是你可以使用包装元素和数据属性,如下所示:
<div class="placeholder" data-placeholder="my placeholder">
<input value="My text" />
</div>
用这个css:
.placeholder
{
position: relative;
}
.placeholder::after
{
position: absolute;
left: 5px;
top: 3px;
content: attr(data-placeholder);
pointer-events: none;
opacity: 0.6;
}
导致:
<强> Click here for jsFiddle demo.
由于您需要进行大量调整以使其看起来不错,您还可以考虑使用包装<div>
元素作为输入“看起来相似”:
<div class="editable" data-placeholder="my placeholder">
<input type="text" value="my Text" />
</div>
CSS:
.editable
{
position: relative;
border: 1px solid gray;
padding: 3px;
background-color: white;
box-shadow: rgba(0,0,0,0.4) 2px 2px 2px inset;
}
.editable > input
{
position: relative;
z-index: 1;
border: none;
background-color: transparent;
box-shadow: none;
width: 100%;
}
.editable::after
{
position: absolute;
left: 4px;
top: 5px;
content: attr(data-placeholder);
pointer-events: none;
opacity: 0.5;
z-index: 1;
}
答案 1 :(得分:9)
通过CSS轻松实现更好的解决方案。看看:http://jsfiddle.net/csdtesting/wbqq129q/
<强>代码:
#login {
font-size: 12px;
margin: 0 auto;
width: 700px;
}
#login li {
float: left;
list-style: none;
margin-left: 30px;
position: relative;
}
#login li:first-child {
margin-left: 0;
}
label {
line-height: 40px;
position: absolute;
right: 120px;
top: 0;
bottom: 0;
-moz-transition: 0.3s right ease;
-ms-transition: 0.3s right ease;
-o-transition: 0.3s right ease;
-webkit-transition: 0.3s right ease;
transition: 0.3s right ease;
z-index: 0
}
input {
color: transparent;
font-size: 12px;
height: 35px;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
-moz-transition: 0.3s all ease;
-ms-transition: 0.3s all ease;
-o-transition: 0.3s all ease;
-webkit-transition: 0.3s all ease;
transition: 0.3s all ease;
}
input[type="email"],
input[type="password"] {
border: 1px solid #ccc;
height: 35px;
padding: 0 10px;
width: 240px;
position: relative;
-moz-box-shadow: inset 0 0 10px rgba(0, 0, 0, .06);
-webkit-box-shadow: inset 0 0 10px rgba(0, 0, 0, .06);
box-shadow: inset 0 0 10px rgba(0, 0, 0, .06);
z-index: 2;
}
input[type="email"] {
color: rgba(47, 130, 194, .8);
}
/* Placeholder */
input[type="email"]:-moz-placeholder {
color: rgba(47, 130, 194, .6);
}
input[type="email"]:-ms-input-placeholder {
color: rgba(47, 130, 194, .6);
}
input[type="email"]::-webkit-input-placeholder {
color: rgba(47, 130, 194, .6);
}
/* Label */
input[type="email"] + label {
color: rgb(47, 130, 194);
}
input:focus + label {
right: 10px;
}
input[type="email"]:focus,
input[type="password"]:focus {
background-color: rgba(255, 255, 255, .8);
}
/* Submit */
input[type="submit"] {
background-color: #333;
background: -moz-linear-gradient(bottom, #333, #444);
background: -ms-linear-gradient(bottom, #333, #444);
background: -o-linear-gradient(bottom, #333, #444);
background: -webkit-linear-gradient(bottom, #333, #444);
background: linear-gradient(bottom, #333, #444);
border: 1px solid #222;
color: #fff;
cursor: pointer;
height: 35px;
width: 110px;
}
<form id="login">
<ul>
<li>
<input id="email" name="email" placeholder="Your Email" title="Your Email" type="email" required />
<label for="email">Your Email</label>
</li>
</ul>
</form>
答案 2 :(得分:0)
这可以通过使用&#39; onchange&#39;处理程序。您可以编写一个花哨的函数,将占位符的其余部分连接到用户键入的内容,并将光标放在用户文本的末尾。
这里有一些未经测试的,不完整的js / psuedocode给你一个想法:
userTextLength: 0, // measure of how many chars the user has typed; need this because the length itself won't be a valid measure, since we're modifying it in place. Note that we're using the DOM as a source of truth here... alternative method would be to store the user's text itself here, but let's run with this.
placeholder: "xx/yy/zz",
onchange: function() {
boxText = document.querySelector('#elem').value;
if (boxText.length === 1) { // special handling for the first character they type. (Using placeholder text at first.)
this.userTextLength++;
placeholder = boxText.slice(userTextLength);
userText = boxText.slice(0, userTextLength);
document.querySelector('#elem').innerHTML = userText + placeholder;
}
if (boxText.length < placeholder.length) { // this would mean they used backspace, which also needs to be handled.
}
else { // the normal case, should look quite similar to the first if block
this.userTextLength += 1;
userInput =
}
}
我在这里处理的是光标聚焦。这将需要一个“焦点”&#39; event,并将使用userTextLength属性来决定放置它的位置。对于这方面的一些帮助,this answer看起来应该有用。
答案 3 :(得分:0)
您可以在此处查看演示:http://hangaumy.com/order/
当您键入时,它会自动添加单词(看起来像占位符)
答案 4 :(得分:0)
您可以尝试执行以下操作:
HTML:
<div class="wrapper">
<input type="text">
<span class="placeholder">Placeholder</span>
</div>
CSS:
.wrapper{
position: relative;
}
input {
font-size: 14px;
height: 40px;
}
.placeholder {
position: absolute;
font-size:25px;
pointer-events: none;
left: 1px;
top: 1px;
transition: 0.1s ease all;
}
input:focus ~ .placeholder{
top: 1px;
font-size: 11px;
}
答案 5 :(得分:0)
.box {
border: 1px solid;
border-radius: 10px;
padding: .25rem 1rem 1rem;
color: #555;
font-family: sans-serif;
display: flex;
flex-direction: column;
width: max-content;
}
.wrapper {
position: relative;
width: 450px;
}
.wrapper * {
font-size: 1.25rem;
letter-spacing: 2px;
font-family: monospace;
padding: .125rem .25rem;
display: flex;
width: calc(100% - 1rem);
}
input {
width: 4000px;
border: 0;
}
.placeholder {
position: absolute;
pointer-events: none;
left: 0;
top: 0;
width: min-content;
}
<div class="box">
<h2>Short Homepage Headline</h2>
<p>Use up tp 30 characters</p>
<div class="wrapper">
<input type="text">
<span class="placeholder">
______________________________
</span>
</div>
</div>
这对于功能、良好的用例及其吸引力如何。
(试图消除上述一些负面因素,哈)
这为标题作家提供了一个整洁的无 js 字符观察器。通过这种方式,他们将能够看到它何时会破坏模板。但您不一定非要受其限制,才能达到硬性限制。