Traversing with jQuery -


i have function adds new unordered list item. i'd set 1 of element's values in newly created list item value based on value in list item above new one.

for instance, if have like:

<form id="form" action="">  <ul id="list1" class="listing">      <li id="input1" class="item">          <input id="descr1" class="descr" type="text" value="" name="descr1" />         <input id="group1" class="group" type="text" value="" name="group1" />         <input id="order1" class="order_field" type="text" value="4" name="order1" />         <input id="row1" class="checkbox" type="checkbox" value="1" name="select_row1" />      </li>      <li id="input2" class="item">          <input id="descr2" class="descr" type="text" value="" name="descr2" />         <input id="group2" class="group" type="text" value="" name="group2" />         <input id="order2" class="order_field" type="text" value="5" name="order2" />         <input id="row2" class="checkbox" type="checkbox" value="2" name="select_row2" />      </li>  </ul>

if run function creates new list item, want value in #order2 incremented 1 , new list item (that have #order3) set 6. example, after have created new list item this:

    <li id="input3" class="item">          <input id="descr3" class="descr" type="text" value="" name="descr3" />         <input id="group3" class="group" type="text" value="" name="group3" />         <input id="order3" class="order_field" type="text" value="6" name="order3" />         <input id="row3" class="checkbox" type="checkbox" value="3" name="select_row3" />      </li>

i need find way last list item , value class .order_field , use value (+1) when create new list item. issue i'm not sure how put selector getting last list item's .order_field value.

i hope makes sense.

thanks, shawn

it's simply:

var value = $('#list1 li:last .order_field').val();

you have convert value number, can using parseint or unary +:

var newvalue = parseint(value, 10) + 1; // or var newvalue = +value + 1;

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