输入字段的一个占位符中有 2 种颜色 [英] 2 colors in one placeholder of input field

问题描述

我需要在占位符中创建有 2 种颜色的输入.

这是在 Chrome 中运行良好的解决方案.

input 等内联元素不支持 :before 和 :after.如您所见，并非所有浏览器都完全支持占位符选择器及其伪类，这让事情变得更加困难.

因此，解决方法是添加一个 label 相对放置在输入框的顶部，并带有一个指向输入文本框的 for 属性.这样，当用户点击标签(假占位符)时，焦点会进入下方的输入框.

将您的 class="required" 替换为属性 required="required".这让您有机会使用 :invalid 和:valid 选择器，还让浏览器显示验证错误，当提交的表单带有空的必填字段时.

input {宽度:160px；}输入[类型=提交] {宽度:自动；}输入[必填]+标签{颜色:#999；字体系列:Arial；字体大小:.8em；位置:相对；左:-166px；/* 输入宽度的负数 */}输入[必需]+标签:{内容: '*';红色;}/* 当输入没有内容时显示占位符(无内容=无效)*/输入[必需]:无效+标签{显示:内联块；}/* 当输入有一些文本输入时隐藏占位符 */输入[必需]:有效+标签{显示:无；}

<input type="text" id="name" name="name" required="required"/><label for="name">Name</label><br/><input type="email" id="email" name="email" placeholder="Email"/><br/><输入类型=提交"/>

因为不需要电子邮件，所以将本地占位符留在那里，只是为了这个名字.

我还将您的电子邮件从 type="text" 更改为 type="email"，以便在移动设备上获得更好的用户体验.

I need create input which has 2 colors in a placeholder.

and here is solution which works well in Chrome.

http://jsfiddle.net/vmuJm/

html

<input placeholder="Name" class="required" />

css

.required::-webkit-input-placeholder:after {
    content:'*';
    color: red;
}
.required:-moz-placeholder:after {
    /* Firefox 18- */
    content:'*';
    color: red;
}
.required::-moz-placeholder:after {
    /* Firefox 19+ */
    content:'*';
    color: red;
}
.required:-ms-input-placeholder:after {
    content:'*';
    color: red;
}

But my current FF 29.0.1 doesn't show content from :after, so this solution doesn't work. Is there any other way to get 2 colors in one placeholder with css and html?

Chrome:

FF:

解决方案

Here is a cross-browser solution that does not use Javascript:

Live demo

Inline elements such input do not support :before and :after. To make things even harder the placeholder selector and their pseudo-classes are not fully supported by all browsers, as you found out.

So, the workaround is to add a label placed relatively on top of the input box with a for attribute pointing to the input text box. This way, when user clicks the label (fake placeholder) the focus goes into the input box underneath.

Replace your class="required" by the attribute required="required". This gives you an opportunity to use the :invalid and :valid selectors, and also lets the browser display a validation error, when the form is submitted with empty required fields.

input {
  width: 160px;
}

input[type=submit] {
  width: auto;
}

input[required]+label {
  color: #999;
  font-family: Arial;
  font-size: .8em;
  position: relative;
  left: -166px;
  /* the negative of the input width */
}

input[required]+label:after {
  content: '*';
  color: red;
}


/* show the placeholder when input has no content (no content = invalid) */

input[required]:invalid+label {
  display: inline-block;
}


/* hide the placeholder when input has some text typed in */

input[required]:valid+label {
  display: none;
}

<form>
  <input type="text" id="name" name="name" required="required" />
  <label for="name">Name</label>
  <br/>
  <input type="email" id="email" name="email" placeholder="Email" />
  <br/>
  <input type="submit" />
</form>

Since the email is not required, leave the native placeholder there, and just to this hack for the name.

I also changed your email from type="text" to type="email" for better user experience on mobile devices.

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