HTML/CSS 用灰色的文本制作一个文本框，当我点击输入信息时消失，如何?

2022-01-13 00:00:00 textbox html css

如何制作一个内容为灰色的文本框，当我点击它输入文本时，灰色部分消失并允许我输入所需的文本?

How do I make a textbox that has a grayed out content, and when I click on it to enter text, the grayed out portion, it disappears and allows me to enter the desired text?

例子:

名字"文本框.名字"字样在文本框中显示为灰色，当我单击时，这些字词会消失，我会在其中写下我的名字.

A "First Name" text box. The words "First Name" are inside the text box grayed out, when I click, those words disappear and I write my name in it.

推荐答案

这个答案说明了 HTML5 之前的方法.请查看 Psytronic 的答案，了解使用 placeholder 属性的现代解决方案.

This answer illustrates a pre-HTML5 approach. Please take a look at Psytronic's answer for a modern solution using the placeholder attribute.

HTML:

<input type="text" name="firstname" title="First Name" style="color:#888;" 
    value="First Name" onfocus="inputFocus(this)" onblur="inputBlur(this)" />

JavaScript:

JavaScript:

function inputFocus(i) {
    if (i.value == i.defaultValue) { i.value = ""; i.style.color = "#000"; }
}
function inputBlur(i) {
    if (i.value == "") { i.value = i.defaultValue; i.style.color = "#888"; }
}

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