Js点餐加减数量
<button class="add-on" onclick="chgNum(1,'del')" ><i class="icon-minus"></i></button> <input class="span3 text-center" id="appendedPrependedInput1" disabled="disabled" type="text" value="0"> <button class="add-on" onclick="chgNum(1,'add')"><i class="icon-plus"></i></button>
<script> function chgNum(ndid, opr){ /** 点餐加减数量,参照以前的**/ var index= parseInt($('#appendedPrependedInput'+ndid).val()); var price = $('.price').html().substring(1); if(opr=='del'){ if(index == 0){ alert("不能减了!"); return ; } $("#appendedPrependedInput"+ndid).val(index - 1); index = index - 1; }else if(opr=='add'){ if(index == 99){ alert('不能加了!'); return ; } $("#appendedPrependedInput"+ndid).val(index + 1); index = index + 1; } $('.nums').html(index); $('.total').html(index*price+'元') } </script>
第二种方法:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"></script> <script> $(function(){ $(".add").click(function(){ var t=$(this).parent().find('input[class*=text_box]'); t.val(parseInt(t.val())+1) setTotal(); }) $(".min").click(function(){ var t = $(this).parent().find('input[class*=text_box]'); t.val(parseInt(t.val())-1) if(parseInt(t.val())<0){ t.val(0); } setTotal(); }) function setTotal(){ var s=0; $("#tab td").each(function(){ s +=parseInt($(this).find('input[class*=text_box]').val())*parseFloat($(this).find('span[class*=price]').text()); }); $("#total").html(s.toFixed(2)); } setTotal(); }) </script> </head> <body> <table id="tab"> <tr> <td> <span>单价:</span><span class="price">1.50</span> <input class="min" name="" type="button" value="-" /> <input class="text_box" name="" type="text" value="1" /> <input class="add" name="" type="button" value="+" /> </td> </tr> <tr> <td> <span>单价:</span><span class="price">3.95</span> <input class="min" name="" type="button" value="-" /> <input class="text_box" name="" type="text" value="1" /> <input class="add" name="" type="button" value="+" /> </td> </tr> </table> <p>总价:<label id="total"></label></p> </body> </html>
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