How to check input text into web form? java script

Question

how to check input text before POST operation? it must be numbers only

<form method="post" action="credit.php">
Сумма кредита: <input type="text" name="sum"> <br />
первый взнос: <input type="text" name="pv"> <br />
Срок: <input type="text" name="srok"> <br />
Процентная ставка: <input type="text" name="percent"> <br />
<input type="submit">
</form>

sorry for my bad english.

Are you using a library such as JQuery? Jquery has plugins like Jquery.Validate — David Perlman
– David Perlman, Commented May 29, 2010 at 20:22
Do you use jQuery or other JavaScript framework? Also, suggestion: use labels to wrap text related to each input, and maybe div to wrap label and input, instead of breaks. — Misha Reyzlin
– Misha Reyzlin, Commented May 29, 2010 at 20:23

bwawok · Accepted Answer · 2010-05-29 20:25:55Z

4

Use some kind of javascript..

<form method="post" action="credit.php" onsubmit="validateForm()">
<input type="text" name="pv" id="pv"> <br />
....
</form>


<script type="text/javascript">
function validateForm() {
  var result =  /^\d+$/.test(document.getElementById('pv').value);
  return result

}
</script>

If your onsubmit returns false, the form won't go. If it returns true, the form will submit.

answered May 29, 2010 at 20:25

bwawok

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4 Comments

butteff Over a year ago

how to alert, when user's input is not a number?

butteff Over a year ago

and at input may be decimal (fraction). how to be with this?

bwawok Over a year ago

How to alert? alert("Please enter a number"); return false;

bwawok Over a year ago

Make a regular expression to check what you want. A regular expression for decimal is ^\d*.?\d*$

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