禁用输入字段中的某些字符 [英] Disable some characters from input field

问题描述

我需要使用户类型只有1个，这个类型只有一个， 2，3，4，5，N，O，A，B，C。所有其他角色都应该受到限制。

我可以自己选择受限制/允许的字符作为输入吗？

试试看javascript不太熟悉。这

$（function（）{$（'＃txt'））。

< keypress（function（e）{if（e.which == 97 || e.which == 98 || e.which == 99 || e.which == 110 || e.which == 111 || e 。这个== 65 || e。这个== 66 || e.which == 67 || e.which == 78 || e.which == 79 || e.which == 49 || e.which == 50 || e.which == 51 || e.which == 52 || e.which == 53）{} else {return false;}}）;}）;

< script src =https://ajax.googleapis.com/ajax/libs/的jquery / 2.1.1 / jquery.min.js>& lt; / script>< input type ='text'id ='txt'value =''onpaste =return false/>

data-lang =jsdata-hide =falsedata-console =truedata-babel =false>

  $（function（）{$（'＃txt'）。keypress（function（e）{// char char 1，2，3，4，5， N，O，A，B，C let allow_char = [97,98,99,110,111,65,66,67,78,79,49,50,51,52,53]; if（allow_char.indexOf（e.which）！== -1）{//做某事} else {return false; < script src =}}）;}）;  

I have found some instructions similar, but none helps, all of them are either for special chars or for digits.

I need to make user type only 1 , 2 , 3, 4, 5, N, O, A, B, C . all other characters should be restricted.

Any way I can make my own selection of restricted/allowed chars for inputs ?

• Not very familiar with javascript.

解决方案

Try this

$(function(){
  $('#txt').keypress(function(e){
    if(e.which == 97 || e.which == 98 || e.which == 99 || e.which == 110 || e.which == 111 || e.which == 65 || e.which == 66 || e.which == 67 || e.which == 78 || e.which == 79 || e.which == 49 || e.which == 50 || e.which == 51 || e.which == 52 || e.which == 53){
    } else {
      return false;
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='text' id='txt' value='' onpaste="return false" />

Update 9th March 2018

$(function(){
  $('#txt').keypress(function(e){
    // allowed char: 1 , 2 , 3, 4, 5, N, O, A, B, C
    let allow_char = [97,98,99,110,111,65,66,67,78,79,49,50,51,52,53];
    if(allow_char.indexOf(e.which) !== -1 ){
      //do something
    }
    else{
      return false;
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='text' id='txt' value='' onpaste="return false" />

这篇关于禁用输入字段中的某些字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！