jQuery如何绑定最后一位数字

Question

i have a table like below which each content is input pop-up

on square i spot you see on last digit have 1,2,8,9 format.

in my html the content of table is value of Posisi

Nomor Rak
     <br><input type="text" id="posisi" readonly/></br>

that automaticly i pick using

<td class="data206"><div align="center"><input class="data206" type="button" onclick="popup_window_show('#sample', { pos : 'tag-right-down', parent : this});setvalue(this.value);" value="A1.7.8" /></div></td>

for an example. so my pop-up like this

my purpose to bind the last digit and then i can manipulate line value. So for an idea script will like below

$(document).ready(function(){
var posisi = $("#posisi").val();
if (posisi== like "1" or like "2" or like "8" or like "9" ){
$("#line").val("9")
}

});

My problem: I don't know how to bind the last digit in jquery..to make conditonal that $("#posisi") last digit value between 1 or 2 or 8 or 9. if this conditional true i can add value in $("#line").val("whatever i want") need help with an example will be appreciate

Answer 1

var posisi = $("#posisi").val();
var regex = /\.(\d+)\.?$/;
// Catches the last set of digits following a period. 
// Allowing for an additional period at the end.

var matches = posisi.match(regex); 
if (matches) {
    var lastNumber = parseInt(matches[1], 10);
    // Do something 
    $("#line").val(lastNumber);
}

Answer 2

Your var posisi will contain a string like "A1.7.8" and you can easily get the last character of string. This may help How can I get last characters of a string using JavaScript

There are a few more tips which may help. It seems that you do not want to wrap the code in document.ready. I think you want to get the last digit value on every click. so get the value in "popup_window_show" function or function you are using to show popup.

Moreover if you want to make calculation on that number ie 1,2,8,9 then convert it into integer form first.