获取隐藏类型值的范围ID的值

Question

I currently have a form that adds up the total value and puts the number inside a span id.

<p>Total: <span id="system_cost">&nbsp;</span></p>

I need that value to be put back into a hidden type value.

<INPUT TYPE=”HIDDEN” NAME=”charge_total” VALUE=”system_cost”>

Im not very good at javascript and am having trouble figuring this out so any help would be very appreciated. I need the id to populate inside the hidden type value.

[edit] sorry I put the wrong code in. [/edit]

Answer 1

Try this:

HTML

<p>Total: <span id="system_cost">&nbsp;</span></p>
<input type="hidden" value="charge_total" id="hidden_cost" />

JS

var span = document.getElementById('system_cost');
var hidden = document.getElementById('hidden_cost');
hidden.value = span.innerHTML;