📲 Generate and fill in IMEI numbers automatically based on the input's id, class or name attribute.

imei-input.js

[].forEach.call(document.querySelectorAll('input'), function(el) {
  el.addEventListener('click', function() {
    //Check the attributes to see if one of them contains IMEI.
    var classes = el.getAttribute('class');
    var id = el.getAttribute('id');
    var name = el.getAttribute('name');
    var attrStr = [classes, id, name].join(' ').toLowerCase();

    if (attrStr.indexOf('imei') > -1) {
      el.value = generateImei();
    }
  });
});

// Script from: https://dyrk.org/tools/imei/
function generateImei(){var pos;var str=new Array(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);var sum=0;var final_digit=0;var t=0;var len_offset=0;var len=15;var issuer;var rbi=["01","10","30","33","35","44","45","49","50","51","52","53","54","86","91","98","99"];var arr=rbi[Math.floor(Math.random()*rbi.length)].split("");str[0]=Number(arr[0]);str[1]=Number(arr[1]);pos=2;while(pos<len-1){str[pos++]=Math.floor(Math.random()*10)%10}len_offset=(len+1)%2;for(pos=0;pos<len-1;pos++){if((pos+len_offset)%2){t=str[pos]*2;if(t>9){t-=9}sum+=t}else{sum+=str[pos]}}final_digit=(10-sum%10)%10;str[len-1]=final_digit;t=str.join("");t=t.substr(0,len);return t}