JavaScript-显示隐藏表单文字

2023-02-17 20:35:55

实现思路

运用 onfocus、onblur事件

onfocus- - -获取焦点(鼠标点击输入框,输入框里面有闪动的光标)

onblur- - -失去焦点(鼠标不选中输入框,输入框里面失去闪动的光标)

  1. 给输入框设置一个默认值

  2. 获取输入框对象,给其绑定事件:onfocus 和 onblur,
    当获取焦点时(onfocus)- - -判断输入框的value值是否是默认值,如果是默认值初始值,将value改为空,默认初始值就没有了,可以输入自己的
    当时去焦点时(onblur)- - -判断输入框的value值是否没有值,没有的话,给value赋值默认值,未输入内容移开后又会显示默认值了

  3. 还可以给获取焦点和失去焦点两种状态的文字颜色设置不同,让两种状态区分的更明显

示例1:

代码:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>获取/失去焦点</title>
    <style>
        input {
            color: #ccc;
            outline: none;
        }
    </style>
</head>

<body>
    <input type="text" value="手机">
    <script>
        var text = document.querySelector('input');
        text.onfocus = function() {
            if (this.value === '手机') {
                this.value = '';
            }
            this.style.color = '#333';
        }

        text.onblur = function() {
            if (this.value === '') {
                this.value = '手机';
            }
            this.style.color = '#ccc';
        }
    </script>
</body>

</html>

页面效果:

显示隐藏文字.gif

示例2

代码:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户名 显示 隐藏</title>
    <style>
        input {
            font-size: 14px;
            color: #999;
            outline: none;
            padding: 3px 0 3px 10px;
            border: 1px solid #ccc;
        }
    </style>
</head>

<body>
    <!--用户名 显示隐藏内容 -->
    <input type="text" value="邮箱/ID/手机号" class="userName">
    <script>
        var userName = document.querySelector('.userName');
        userName.onfocus = function() {
            if (this.value === '邮箱/ID/手机号') {
                this.value = '';
                this.style.borderColor = 'pink';
            } else {
                this.style.borderColor = 'pink';
                this.style.color = '#999';
            }
        }
        userName.onblur = function() {
            if (this.value === '') {
                this.value = '邮箱/ID/手机号';
                this.style.borderColor = '#ccc';
                this.style.color = '#999';
            } else {
                this.style.borderColor = '#ccc';
                this.style.color = '#333';
            }
        }
    </script>
</body>

</html>

页面效果:

输入显示隐藏2.gif

  • 作者:零OO
  • 原文链接:https://blog.csdn.net/qq_39111074/article/details/120484809
    更新时间:2023-02-17 20:35:55