检查数字是否按顺序排列 [英] check if numbers are in sequence

问题描述

我有一个文本框，其最大长度为4，如果用户按顺序输入数字，则需要抛出错误.

I have a textbox which contains a maxlength of 4 and if the user enters the numbers in sequence then needs to throw an error.

示例:以下是一些需要阻止的示例:

Examples: Below are few examples which needs to block:

1234、4567、5678等

1234, 4567, 5678 etc

它可以接受1233、4568等

And it can accept 1233, 4568 etc

我期望在Jquery或JavaScript中出现这种情况.

I'm expecting this condition in Jquery or JavaScript.

任何帮助将不胜感激

代码:我想使用以下格式的代码:

Code: I want to use the code in below format:

$.validator.addMethod("Pin", function(b) {

var a = true;

**a = (/^([0-9] ?){4}$/i).test(b);**

return a

}, "");

我们可以替换为粗体的条件.

We can replace the condition which is in bold.

推荐答案

最简单的解决方案是使用以下代码

The simplest solution would be to use the following code

/**
* The sequential number would always be a subset to "0123456789".
* For instance, 1234, 4567, 2345, etc are all subset of "0123456789".
* To validate, this function uses 'indexOf' method present on String Object.
* you can read more about 'indexOf' at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf
*/
$.validator.addMethod("Pin", function(b) {
  var numbers = "0123456789";
  //If reverse sequence is also needed to be checked
  var numbersRev = "9876543210";
  //Returns false, if the number is in sequence
  return numbers.indexOf(String(b)) === -1 && numbersRev.indexOf(String(b)) === -1;    
}, "");

只有在还需要反向序列验证的情况下，才需要使用变量numbersRev的条件

The condition with the variable numbersRev is only needed if the reverse sequence validation is also required

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