javascript - Setting function decrement in variable onclick function -

please.. need thing.. wanna use variable id in html, call function in javascript page.

example: html

(minus button dont work)

<button class="minus-button quantity-button button" type="button" name="subtract" onclick="javascript: subtractdiv2(document.getelementbyid('<ccom:field id='code' />'));" value="-">&nbsp;</button> 

(this input quantity works normal)

 <input class="quantity-input" value="<ccom:field id="qtd"/>" maxlength="3" id='<ccom:field id="code" />' name="div2" onkeypress="return somentenumerico(event);"/> 

(plus button works normal)

<button class="plus-button quantity-button button" type="button" name="add" onclick="javascript:document.getelementbyid('<ccom:field id='code' />').value++;" value="+"></button> 

javapage

function subtractdiv2(){             if(value - 1 < 0)                 return;             else                  value--;         }; 

you're not using argument function. should be:

function subtractdiv2(div) {     var value = parseint(div.value, 10);     if (value < 1) {         return;     } else {         div.value = value - 1;     } }