如何使用javascript删除数字1234567890以外的所有内容

Question

i have the following javascript how and where to set so when it will get the data and shows in a textbox it will show only numeric values:

<script type="text/javascript">
function showData($sel){
   var str='';
   document.getElementById("demo").innerHTML;
   for (var i=0;i<sel.options.length;i++){
           str+=(str!='') ? ', '+sel.options[i].value : sel.options[i].value;
       }
   }
   sel.form.selectedFruits.value = str;
}
</script>

i have multiple select dropdown and it has multiple values like Staff No and email so i dont want to show email in text box only staff no and even i dont want to remove email from values.

it is working fine except what i want to do :D

Answer 1

A simple solution, if you want to get only numbers from a string (or html in your example), will be :

var str= document.getElementById(id).innerHTML;
return str.replace(/[^0-9]/ig, '');

See this jsfiddle .

Answer 2

if I've gotten the point correctly try something like this

<script type="text/javascript">
function showData($sel){
   var str=[];
   document.getElementById("demo").innerHTML;
   for (var i=0;i<sel.options.length;i++){
           str[i]+=sel.options[i].value.replace(/\D/g, ''); // remove everything except digits
       }
   }
   sel.form.selectedFruits.value = str.join();
}
</script>

Answer 3

<script type="text/javascript">
function showStaffno(sel){
   var str='';
   document.getElementById("demo").innerHTML;
   for (var i=0;i<sel.options.length;i++){
       if (sel.options[i].selected){
           str+=(str!='') ? ', '+sel.options[i].value.replace(/\D/g, '') : sel.options[i].value.replace(/\D/g, '');
       }
   }
   sel.form.selectedFruits.value = str;
}
</script>