如何使用掩码实现输入 [英] How to implement an input with a mask
问题描述
我想为接受日期的文本输入字段实现一个掩码。掩码的值应直接显示在输入内。
这样的一个例子:
< input type ='text'value ='____ / __ / __'>
我在这个例子中写了一个值,但我的目的是让人们写一个日期不输入 /
或 -
分隔月,年和日。用户应该能够在显示的字段中输入数字,而掩码在用户键入时自动执行格式。
我在其他网站上看到这种行为,但我不知道它如何工作或如何自己实现。
输入掩码可以使用< a href =https://developer.mozilla.org/en-US/docs/Web/Events/keyup =noreferrer> keyup
事件和 HTMLInputElement
value
, selectionStart
和 selectionEnd
属性。这是一个非常简单的实现,可以做一些你想要的。这绝对不是完美的,但是效果很好,可以演示原理:
.prototype.forEach.call(document.body.querySelectorAll(* [data-mask]),applyDataMask); function applyDataMask(field){var mask = field.dataset.mask.split(''); //现在,这只是剥夺所有不是数字函数的功能stripMask(maskedData){function isDigit(char){return /\d/.test(char); } return maskedData.split('')。filter(isDigit); } //将`_`个字符替换为`data`函数的函数applyMask(data){return mask.map(function(char){if(char!='_')return char; if(data.length == 0 )return char; return data.shift();})。join('')} function reapplyMask(data){return applyMask(stripMask(data)); } function changed(){var oldStart = field.selectionStart; var oldEnd = field.selectionEnd; field.value = reapplyMask(field.value); field.selectionStart = oldStart; field.selectionEnd = oldEnd; } field.addEventListener('click',changed)field.addEventListener('keyup',changed)}
ISO日期:< input type =textvalue =____ _ _ _ _ _data-mask =____ _ _ _ _ _/>< br />电话:< input type =textvalue =(___)___-____data-mask =(___)___-____/>< br />
pre>
还有一些执行此功能的库。一些例子包括:
- jquery.inputmask
- MASKED INPUT PLUGIN
- Politespace (提供一个替代输入掩码)
I would like to implement a mask for a text input field which accepts a date. The masked value should display directly inside of the input.
Something like this:
<input type='text' value='____/__/__'>
I wrote the mask as a value in that example, but my intent is to allow people to write a date without typing /
or -
to separate months, years and days. The user should be able to enter numbers into the displayed field, while the mask enforces the format automatically as the user types.
I have seen this behavior on other sites, but I have no idea how it works or how to implement it myself.
Input masks can be implemented using a combination of the keyup
event, and the HTMLInputElement
value
, selectionStart
, and selectionEnd
properties. Here's a very simple implementation which does some of what you want. It's certainly not perfect, but works well enough to demonstrate the principle:
Array.prototype.forEach.call(document.body.querySelectorAll("*[data-mask]"), applyDataMask);
function applyDataMask(field) {
var mask = field.dataset.mask.split('');
// For now, this just strips everything that's not a number
function stripMask(maskedData) {
function isDigit(char) {
return /\d/.test(char);
}
return maskedData.split('').filter(isDigit);
}
// Replace `_` characters with characters from `data`
function applyMask(data) {
return mask.map(function(char) {
if (char != '_') return char;
if (data.length == 0) return char;
return data.shift();
}).join('')
}
function reapplyMask(data) {
return applyMask(stripMask(data));
}
function changed() {
var oldStart = field.selectionStart;
var oldEnd = field.selectionEnd;
field.value = reapplyMask(field.value);
field.selectionStart = oldStart;
field.selectionEnd = oldEnd;
}
field.addEventListener('click', changed)
field.addEventListener('keyup', changed)
}
ISO Date: <input type="text" value="____-__-__" data-mask="____-__-__"/><br/>
Telephone: <input type="text" value="(___) ___-____" data-mask="(___) ___-____"/><br/>
There are also a number of libraries out there which perform this function. Some examples include:
- jquery.inputmask
- MASKED INPUT PLUGIN
- Politespace (presents an alternative to input masks)
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