How to find duplicate id's in a form?

Question

I\'ve created a form with about 800 fields in it. Unknowingly I\'ve given same id for few fields in the form. How to trace them?

Answer 1

This might help you

Source: Finding duplicate ID’s on an HTML page

Finding duplicate ID’s on an HTML page

Written by Eneko Alonso on May 6, 2011

Looks like sometimes we forgot element ID’s are meant to be unique on a HTML page. Here is a little bit of code I just wrote to find duplicate ID’s on a page (run the code on your browser’s javascript console):

var idList = {};
var nodes = document.getElementsByClassName('');
for (var i in nodes) {
  if (!isNaN(i) && nodes[i].id) {
    idList[nodes[i].id] = idList[nodes[i].id]? idList[nodes[i].id]+1:1;
  }
}
for (var id in idList) {
  if (idList[id] > 1) console.log("Duplicate id: #" + id);
}