1.
这里是 original auto format date别人做的，
因此日期类似于 12/12/2019，我们使用 space/space 来分隔数字。
2.
我想使用类似12/12/2019 的格式，但似乎无法删除。
var outV = v.length == 2 && i < 2 ? v + "/" : v;
这是我的新密码
<html>
<head>
<style>
html {
/* box */
box-sizing: border-box;
/* family */
font-family: "PT Sans", sans-serif;
/* smooth */
-webkit-font-smoothing: antialiased;
}
/* all box */
*,
*:before,
*:after {
box-sizing: inherit;
}
/* body bg */
body {
background-color: #f3f3f3;
}
/* form */
form {
width: 100%;
max-width: 400px;
margin: 60px auto;
}
/* form input */
form input {
/* big box */
font-size: 30px;
padding: 0 20px;
border: 2px solid #ccc;
width: 100%;
color: #666;
line-height: 3;
border-radius: 7px;
font-family: "PT Sans", sans-serif;
font-weight: bold;
}
form input:focus {
outline: 0;
}
form input.error {
border-color: #ff0000;
}
form label.error {
background-color: #ff0000;
color: #fff;
padding: 6px;
font-size: 11px;
}
label {
color: #999;
display: block;
margin-bottom: 10px;
text-transform: uppercase;
font-size: 18px;
font-weight: bold;
letter-spacing: 0.05em;
}
/* use small */
form small {
color: #888;
font-size: 1em;
margin-top: 10px;
display: block;
align-self: ;
}
</style>
</head>
<body>
<!-- https://codepen.io/tutsplus/pen/KMWqRr -->
<form id="form" method="post" action="">
<label for="amount">Date</label>
<input type="text" id="date" />
<small>Enter date as Day / Month / Year</small>
</form>
</body>
<script>
// input date by id
var date = document.getElementById("date");
// check val, str?, max?
function checkValue(str, max) {
// 1. 02, we don't check, because 0->12 (month) or 0->31
// 2. 00, we check
if (str.charAt(0) !== "0" || str == "00") {
//test
console.log("&& in");
// str to num
var num = parseInt(str);
// 1. not a number (below code, already filter out \D)
// 2. # <= 0, e.g. -1
// 3. 32 > 21 in month
// default to 1
if (isNaN(num) || num <= 0 || num > max) num = 1;
// 1. month: 3 > 12's 1st char ==> 03
// 2. month: 1 <= 12's 1st char ===> 1.toStr, later more #
// 3. day: 2 <= 31's 1st chr ===> 2.toStr, later more #
str =
num > parseInt(max.toString().charAt(0)) && num.toString().length == 1
? "0" + num // self, no more #
: num.toString(); // can be more num
}
return str;
}
// user typing
date.addEventListener("input", function(e) {
//test
console.log("=== listen input ====", this.value);
// date input type is text
this.type = "text";
// date input value to var
var input = this.value;
// del is \D, non-digit
// e.g. 02/ -> del 2 -> actual del 2/ -> 0 (left)
//if (/\D\/$/.test(input)) {
if (/\/$/.test(input)) {
//test
console.log("--digi slash--", input);
// substr, last exclude, len-3
input = input.substr(0, input.length - 3);
//test
console.log("--digi slash after--", input);
}
// remove non-digi
var values = input.split("/").map(function(v) {
// \D is not digit, so replace not digit to ""
var replacedV = v.replace(/\D/g, "");
return replacedV;
});
// e.g.
// month, day
// values == ["01", "12"]
// check date, may not have
if (values[0]) values[0] = checkValue(values[0], 31);
// check month, may not have
if (values[1]) values[1] = checkValue(values[1], 12);
var output = values.map(function(v, i) {
// test
console.log("*** add slash", i);
//var outV = v.length == 2 && i < 2 ? v + " / " : v;
var outV = v.length == 2 && i < 2 ? v + "/" : v;
return outV;
});
// join everything,
console.log("output", output);
console.log("substr", output.join("").substr(0, 14));
// e.g. 01/01/1992 ==> 9 chars
// 01 / 01 / 1992 ==> 13 chars
this.value = output.join("").substr(0, 14);
console.log(">>> this.value", this.value);
});
</script>
</html>
最佳答案
在原来的笔中，斜线之间有一个空格。所以当用户删除一个空格时，我们可以检查最后一个字符是否是“/”并删除之前的字符。
在你的情况下没有空间。在任何时候，您的更改监听器都会以最后一个字符作为数字被调用。
所以你不能使用这种方法。在这种情况下，我会建议，跟踪以前的值并使用它来删除“/”之前的字符。
示例 如果 prevValue = "12/12/" 并且用户点击删除，输入监听器将调用值为 12/12。此时您无法决定是删除还是插入。
您可以使用以前的输入来解决此问题 if (prevInput.length > input.length &&/\d\/$/.test(prevInput)) {
如果您需要代码笔，请在下面添加。
https://codepen.io/nithinthampi/pen/XWWrJRz
下面的最终解决方案。希望这对您有所帮助!
<html>
<head>
<style>
html {
/* box */
box-sizing: border-box;
/* family */
font-family: "PT Sans", sans-serif;
/* smooth */
-webkit-font-smoothing: antialiased;
}
/* all box */
*,
*:before,
*:after {
box-sizing: inherit;
}
/* body bg */
body {
background-color: #f3f3f3;
}
/* form */
form {
width: 100%;
max-width: 400px;
margin: 60px auto;
}
/* form input */
form input {
/* big box */
font-size: 30px;
padding: 0 20px;
border: 2px solid #ccc;
width: 100%;
color: #666;
line-height: 3;
border-radius: 7px;
font-family: "PT Sans", sans-serif;
font-weight: bold;
}
form input:focus {
outline: 0;
}
form input.error {
border-color: #ff0000;
}
form label.error {
background-color: #ff0000;
color: #fff;
padding: 6px;
font-size: 11px;
}
label {
color: #999;
display: block;
margin-bottom: 10px;
text-transform: uppercase;
font-size: 18px;
font-weight: bold;
letter-spacing: 0.05em;
}
/* use small */
form small {
color: #888;
font-size: 1em;
margin-top: 10px;
display: block;
}
</style>
</head>
<body>
<!-- https://codepen.io/tutsplus/pen/KMWqRr -->
<form id="form" method="post" action="">
<label for="amount">Date</label>
<input type="text" id="date" />
<small>Enter date as Day / Month / Year</small>
</form>
</body>
<script>
// input date by id
var date = document.getElementById("date");
// check val, str?, max?
function checkValueWrapper() {
var prevValue = "";
return function updatePrevValue(newValue) {
prevValue = newValue;
};
}
function checkValue(str, max) {
// 1. 02, we don't check, because 0->12 (month) or 0->31
// 2. 00, we check
if (str.charAt(0) !== "0" || str == "00") {
//test
console.log("&& in");
// str to num
var num = parseInt(str);
// 1. not a number (below code, already filter out \D)
// 2. # <= 0, e.g. -1
// 3. 32 > 21 in month
// default to 1
if (isNaN(num) || num <= 0 || num > max) num = 1;
// 1. month: 3 > 12's 1st char ==> 03
// 2. month: 1 <= 12's 1st char ===> 1.toStr, later more #
// 3. day: 2 <= 31's 1st chr ===> 2.toStr, later more #
str =
num > parseInt(max.toString().charAt(0)) && num.toString().length == 1
? "0" + num // self, no more #
: num.toString(); // can be more num
}
return str;
}
function wrapEventListener() {
var prevInput = "";
return function(e) {
//test
console.log("=== listen input ====", this.value);
// date input type is text
this.type = "text";
// date input value to var
var input = this.value;
// del is \D, non-digit
// e.g. 02/ -> del 2 -> actual del 2/ -> 0 (left)
//if (/\D\/$/.test(input)) {
//if prevInput length id greate e
if (prevInput.length > input.length && /\d\/$/.test(prevInput)) {
//test
console.log("--digi slash--", input);
// substr, last exclude, len-3
input = input.substr(0, input.length - 1);
//test
console.log("--digi slash after--", input);
}
// remove non-digit
var values = input.split("/").map(function(v) {
// \D is not digit, so replace not digit to ""
var replacedV = v.replace(/\D/g, "");
return replacedV;
});
// e.g.
// month, day
// values == ["01", "12"]
// check date, may not have
if (values[0]) values[0] = checkValue(values[0], 31);
// check month, may not have
if (values[1]) values[1] = checkValue(values[1], 12);
var output = values.map(function(v, i) {
// test
console.log("*** add slash", i);
//var outV = v.length == 2 && i < 2 ? v + " / " : v;
var outV = v.length == 2 && i < 2 ? v + "/" : v;
return outV;
});
// join everything,
console.log("output", output);
console.log("substr", output.join("").substr(0, 14));
// e.g. 01/01/1992 ==> 9 chars
// 01 / 01 / 1992 ==> 13 chars
this.value = output.join("").substr(0, 14);
prevInput = this.value;
console.log(">>> this.value", this.value);
};
}
// user typing
date.addEventListener("input", wrapEventListener());
</script>
</html>关于javascript - 无法使用javascript以自动格式删除，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58212245/