simple javascript function not working inside form

Question

I have a simple Javascript function, but its not working inside a form. It looks like this:

echo "<tr><td><form name='formfolder' method='POST' action='?module=pindah_dok_index' >";
echo "<input type=hidden name='id_debt' value='$_GET[id_debt]' />";
echo "move docs</td><td>";
echo "<input type='text' name='index1_dok' id='xcvbn' onkeyup='xcvbn()' style='width:80px;' required />";

But when I place my input #xcvbn before / outside the form, it works perfectly.

My Javascript function is simple like this:

function xcvbn(){    
  var xx=document.getElementById("xcvbn");
  var x = xx.value;
  var str = x.replace(/[^0-9a-zA-Z\-_.]/g, ''); 
  var str = str.toUpperCase();
  xx.value = str;
}

we need to see the whole form, and to also know what errors you receive (perhaps in the console) or what you mean by its not working — Adelin
– Adelin, Commented Feb 7, 2018 at 6:56

Sankar · Accepted Answer · 2018-02-07 07:13:07Z

2

Your input element's id is same as the function name.

Some browsers directly accept the form element's id in JS. See the below snippet (tested in FF).

console.log(asdf.value);

<form>
<input id="asdf" value="text" />
</form>

So it makes a conflict. That's why function was not triggered. use different name for input elements id and function.

Better you can pass this object in the function argument like below.

function xcvbn(elem) {
  var x = elem.value;
  var str = x.replace(/[^0-9a-zA-Z\-_.]/g, '');
  var str = str.toUpperCase();
  elem.value = str;
}

<tr>
  <td>
    <form name='formfolder' method='POST' action='?module=pindah_dok_index'>
      <input type=hidden name='id_debt' value='$_GET[id_debt]' />move docs</td>
  <td>
    <input type='text' name='index1_dok' id='elemId' onkeyup='xcvbn(this)' style='width:80px;' required />

edited Feb 7, 2018 at 7:13

answered Feb 7, 2018 at 6:58

Sankar

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5 Comments

Adelin Over a year ago

I doubt that's the issue. That would be a real problem - if the function names would be mixed with the DOM ids

Adelin Over a year ago

But you are right. Didn't know there's a conflict between the two. +1

Adelin Over a year ago

If anyone else is curious: Why JS function name conflicts with element ID?

Sankar Over a year ago

@Adelin Some browsers directly accept the form element's id in JS. So it makes conflicts. I would add this info in my post.

topansaja Over a year ago

wow its workkkk. thank you so much mr @sankar, really appreciate that. thanks everyone. thanks from me newbie :D

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