按Id检查复选框

Question

I am using the following piece of code to check some checkboxes based on their Id and a value stored in a array. So if the array has a value, the corresponding checkbox should become checked.

for($k=0;$k<count($array_ids);$k++){
     echo'<script type="text/javascript">

    var cb = document.getElementsById("id_'.$array_ids[$k].'");
    cb.checked = true;

</script>';
}

And this is the code for the checkboxes:

<input type="checkbox" id="id_'.$array_ids[$k].'" name="'.$array_ids[$k].'" value="checked" class= "My_class" onchange="add_on_textBox(this,\''.$array_ids[$k].'\',\'My_class\')">

And this is the var_dump result for the $array_ids:

array(2) {
  [0]=>
  string(5) "Name1"
  [1]=>
  string(5) "Name2"
}

The code doesn't work. I am pretty sure I am missing something.

Answer 1

Since ID's are unique in a page, there is no plural of getElementById().

You are using getElementsById()...remove the s.

This should be throwing errors in browser dev tools console also which would give you clue where the problem is.