Using jquery to user only allow numbers in single line text field with infopath 2010 form

Please provide me right solution for the same.
I have already used below script, but this is not working
<script type="text/javascript">
    $(document).ready(function () {
  var input = document.getElementById('ctl00_m_g_85322960_0783_4665_a3e7_41708ddd7c1c_FormControl0_V1_I1_T3');
input.onkeydown = function(e) {
    //var k = e.which;
    /* numeric inputs can come from the keypad or the numeric row at the top */
     if (e.shiftKey || e.ctrlKey || e.altKey) {
e.preventDefault();
} else {
var key = e.keyCode;
if (!((key == 8) || (key == 46) || (key >= 35 && key <= 40) || (key >= 48 && key <= 57) || (key >= 96 && key <= 105))) {
e.preventDefault();
</script>

Hi,
As Matt mentioned, it is OK to change field type to number if you want only number can be entered in the textbox. If you want to treat them as string in the backend, you can use CONVERT function to change its data type in the code.
If you insist on jquery, try to change condition paremeter in IF to:
key >
31 &&
(key <
47 ||
key > 57)
The order number of numbers (0 ~ 9) is from 48 to 57 (in Dec).
Miles LI TechNet Community Support

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