Codeigniter - 提交后Chrome自动填充更改输入值

Is quite simple but very strange. I'm using Codeigniter, i've an App where an User can create other users and then change their passwords.

For this reason i've a simple form as the following:

<form action="<?php echo site_url("Manage/changeUserPassword"); ?>" method="post">
    <input hidden class="inputwithiduser" type="text" name="iduser" value="">
    <input type="password" id="inputPasswd" name="password" placeholder="New password" value="">
    <button type="submit">Save</button>
</form>

I fill the first input (with class inputwithiduser) with JQuery. Inspectioning, these inputs have the correct values. BUT.... AFTER SUBMIT my controller retrieve as $this->input->post("iduser"); the value that Chrome has saved as Username for my personal login. In other words, CHROME is changing my input (despite inspecting the iduser input with Chrome tool it's all okay) after submit!

Have you any ideas? I tried with autocomplete="off", autocomplete="false", etc without success.

Thank, Luca

Have you tried autocomplete="foo" (or whatever value)? New browsers use this attribute different as they used it before