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JavaScript limits can only enter numbers and decimals

Source: Internet
Author: User
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Web page effects limit you can only enter numbers and decimals
You can only enter a number, and the range is between 0.0~999.9, a decimal can be entered only one digit, the integer up to 3 digits, allowing no decimal.
Requirements: An input box, you can only enter a number or decimal point, other characters do not display;
The integer part is entered up to three bits;
The decimal part is entered at most one digit.

1: 2:    3: <script language=javascript>   1:     2:function limite (object) & nbsp;  3: {   4:     if (isNaN (object.value))         5:     {       6:          dosubstring (object);   7:    }   8:     else   9:     {  10:         var index = Object.value.indexof ('. ');   11:         if (Index > 0)   12:          {  13:             if ( Object.value.length > Index + 2)   14:                  dosubstring (object);  15:&NBSP;&NBSP;&Nbsp;     }  16:         else  17:          {  18:              var ivalue = parseint (obaject.value);  19:              if (Ivalue < 0 | | ivalue >=1000)   20:                  dosubstring (object);  21:         }  22:    } :}  24:function dosubstring (object )  : {  26:     object.value=object.value.substring (0,object.value.length-1);  :}</script>
4: 5:
6: <body>
7: <input onpropertychange= "Limite (this)" Maxlength= "5" name= "Amount"/>
8: </body>
9:

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