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javascript - How to get closest input type text's value in javascript?

问题描述

I am designing one table in html and it contains time picker in one td as start time and second time picker in second td as end time in one tr. I want to take both values (start time and end time) and want to calculate time difference and want to show in third td. But i am not able to get particular td's value to calculate difference.

  <table id="example1" class="machinetable" cellspacing="0" width="100%">
  <thead>
    <tr>

     <th>Sr. no.</th>
     <th>Machine Name</th>
     <th >Rate Type</th>
     <th >Rate Unit</th>
     <th >Rate</th>
     <th >Start Time</th>
     <th >End Time</th>
     <th >Total Time</th>
 </thead>
 <tbody>
    <tr role="row" class="odd">
      <td>1</td>
      <td>JCB</td>
      <td>MH23GH5477</td>
      <td>per Hour</td>
      <td>1000</td>
      <td>
          <div class="input-group"><input name="start_time" value="" class="form-control form-cont datetime start_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span>
        </div>
      </td>
      <td>
         <div class="form-group nomargin">
            <div class="input-group" ><input name="end_time" value="" onchange="calculate_time(this.value)" class="form-control form-cont datetime end_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span></div>
        </div>
      </td>
      <td class="total_time"></td>
   </tr>
   <tr role="row" class="odd">
      <td>2</td>
      <td>JCB</td>
      <td>MH2398</td>
      <td>per Hour</td>
      <td>1000</td>
      <td>
         <div class="input-group" ><input name="start_time" value="" class="form-control form-cont datetime start_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span>
         </div>
      </td>
      <td>
         <div class="form-group nomargin">
            <div class="input-group" ><input name="end_time" value="" onchange="calculate_time(this.value)" class="form-control form-cont datetime end_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span></div>
         </div>
      </td>
      <td class="total_time"></td>
   </tr>
</tbody>

Javascript function:

function calculate_time(time)
{
   var endtime1 = time;
   var starttime1= 
   $(this).closest('td').prev('td').find("input[name=start_time]")val();
   alert(starttime1);
   alert(endtime1);
}

Getting error :

start time undefined

I am new to js.

标签： javascriptjqueryhtmljquery-selectors

解决方案

由于您在函数内使用当前元素的引用，因此首先传递this而不是this.value在函数中传递。您之前也错过了点 ( .) val()。

现在更改如下功能：

function calculate_time(time){
  var endtime1 = time.value;
  var starttime1= $(time).closest('td').prev('td').find('.start_time').val();
  alert(starttime1);
  alert(endtime1);
}


function calculate_time(time){
   var endtime1 = time.value;
   var starttime1= $(time).closest('td').prev('td').find('.start_time').val();
   alert(starttime1);
   alert(endtime1);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="example1" class="machinetable" cellspacing="0" width="100%">
  <thead>
    <tr>

     <th>Sr. no.</th>
     <th>Machine Name</th>
     <th >Rate Type</th>
     <th >Rate Unit</th>
     <th >Rate</th>
     <th >Start Time</th>
     <th >End Time</th>
     <th >Total Time</th>
 </thead>
 <tbody>
    <tr role="row" class="odd">
      <td>1</td>
      <td>JCB</td>
      <td>MH23GH5477</td>
      <td>per Hour</td>
      <td>1000</td>
      <td>
          <div class="input-group"><input name="start_time" value="" class="form-control form-cont datetime start_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span>
        </div>
      </td>
      <td>
         <div class="form-group nomargin">
            <div class="input-group" ><input name="end_time" value="" onchange="calculate_time(this)" class="form-control form-cont datetime end_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span></div>
        </div>
      </td>
      <td class="total_time"></td>
   </tr>
   <tr role="row" class="odd">
      <td>2</td>
      <td>JCB</td>
      <td>MH2398</td>
      <td>per Hour</td>
      <td>1000</td>
      <td>
         <div class="input-group" ><input name="start_time" value="" class="form-control form-cont datetime start_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span>
         </div>
      </td>
      <td>
         <div class="form-group nomargin">
            <div class="input-group" ><input name="end_time" value="" onchange="calculate_time(this)" class="form-control form-cont datetime end_time" type="text"><span class="input-group-addon group-addon"><span><i class="fa fa-clock-o" aria-hidden="true"></i></span></span></div>
         </div>
      </td>
      <td class="total_time"></td>
   </tr>
</tbody>

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