javascript - Input text box as positive/negative/floating number with max length 11 - 


number : <input type="text" name="inputid" id="quantity" maxlength="11" />

when user enter input should satisfy below conditions 1. value can positive or negative or floating max length 11

this have written far

$(document).ready(function () {   //called when key pressed in textbox   $("#inputid").keypress(function (e) {      //if letter not digit display error , don't type      if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57 || e.which == 45 )) {         //display error message          if(e.which == 45) {                 var value = $("#quantity").val();                 if(value.indexof('-') !=  -1)                 {                       var index = value.lastindexof('-');                      if(index = 0){                      return false;                    }                 }           }          else          {              $("#quantity").val("-");             }            }    }); });

i did not consider "." of negative sign should @ index zero.

is there better way or modifying code right way go.

kindly suggest.

probably easiest approach use html5 validation:

<body>     <form>         <input type="text" maxlength="11" pattern="\-?\d+\.?\d+" />         <input type="submit" value="submit" />     </form> </body>

https://jsfiddle.net/9g0txx68/2/


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