javascript - Validating numeric value in text field does not give desired result -

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validating text field value may positive whole number or number 1 decimal point , 1 decimal after point in javascript:

123 1 12345 233.2 1212.2 1.1

are valid numbers , 

1.222 1.33 -89789 -3

are invalid numbers.

ihave applied not desired result

  function checkonedecimal(txtbox) {              if (txtbox.value.length > 0)              {                  if (isnan(txtbox.value)) {                      txtbox.value = "";                      alert("please enter number 1 decimal places");                      txtbox.focus();                      return;                  }                  else if (parsefloat(txtbox.value) > 0)                  {                      txtbox.value = "";                      alert("please enter number 1 decimal places. eg. 8.1");                      txtbox.focus();                      return;                  }                   var oregexp = /^\s*\d+\.\d{1}\s*$/;                    if (oregexp.test(txtbox.value))                      { }                    else {                           txtbox.value = "";                          alert("please enter number 1 decimal places");                          txtbox.focus();                      }                }          }

this regex should do:

/^\d*\.?\d$/

demo: http://jsbin.com/ovavafu/1/edit


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