Ask for answers from regular people.

the requirement is like this. The input input box can only enter numbers and decimals, the beginning cannot be a dot and zero, and the decimal can only be two digits at most. Thank you!

Javascript
Mar.11,2021

/ ^ d * (?: .d {0 2})? $/
reference article: http://www.jb51.net/article/8.

<input id="input">
var reg = /^[1-9]\d*(\.\d{0,2})?$|^0(\.\d{0,2})?$|^-([1-9]{1}\d*(\.\d{0,2})?)?$|^-(0(\.\d{0,2})?)?$/;

var input = document.getElementById('input');

var oldValue = '';
input.addEventListener('input',function(){
  console.log(input.value)
    if(input.value && !reg.test(input.value)){
      input.value = oldValue;
    }  
  oldValue = input.value;
});

input.addEventListener('change',function(){
   if(input.value.endsWith('.') || input.value.endsWith('-')){
     input.value = input.value.slice(0,-1);
   }
});

https://codepen.io/randyou/pe.

Previous: Vue-cli can't load the picture module, so I can't find it. What's going on?

Next: Soup.find ('table') in python crawler cannot find content

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu