Javascript将输入值onclick更改为单击按钮的同一行中的值 [英] Javascript change input values onclick to the value on the same row which the button was clicked

问题描述

让我们说一下，如果我在第三行选择浮动汇率，然后单击等号按钮.所有其他行的其余值将其值更改为浮动汇率.我也想将tis函数应用于所有其他行.

let's say if I select floating rate on the third row and I click on the equal sign button. The rest of the value of all the other row will change its value to floating rate. I want to apply tis function to all the other rows too.

JavaScript:

Javascript:

<script type="text/javascript"> 
   $(document).ready(function() { 
       $('.equal').on('click', function() { 
           $('.dropDown').val('Floating Rate'); 
       }) 
   }); 
</script>

表格:

<td>
<select class="dropDown" style="width:150px" name="rate_value_1">
<option value="<?php echo $_SESSION['rate_value_1'] ;?>"><?php echo $_SESSION['rate_value_1'] ;?></option>
<option value="Fixed Rate">Fixed Rate</option>
<option value="Floating Rate">Floating Rate</option>
</select>
</td>
<td><input type="button" value="select" class="equal" /></td> 
</tr>
<tr>
<td>
<select class="dropDown" style="width:150px" name="rate_value_2">
<option value="<?php echo $_SESSION['rate_value_2'] ;?>"><?php echo $_SESSION['rate_value_2'] ;?></option>
<option value="Fixed Rate">Fixed Rate</option>
<option value="Floating Rate">Floating Rate</option>
</select>
</td>
<td><input type="button" value="select" class="equal" /></td> 
</tr>
<tr>
<td>
<select class="dropDown" style="width:150px" name="rate_value_3">
<option value="<?php echo $_SESSION['rate_value_3'] ;?>"><?php echo $_SESSION['rate_value_3'] ;?></option>
<option value="Fixed Rate">Fixed Rate</option>
<option value="Floating Rate">Floating Rate</option>
</select>
</td>
<td><input type="button" value="select" class="equal" /></td> 
</tr>
<tr>
<td>
<select class="dropDown" style="width:150px" name="rate_value_4">
<option value="<?php echo $_SESSION['rate_value_4'] ;?>"><?php echo $_SESSION['rate_value_4'] ;?></option>
<option value="Fixed Rate">Fixed Rate</option>
<option value="Floating Rate">Floating Rate</option>
</select>
</td>
<td><input type="button" value="select" class="equal" /></td> 

推荐答案

好的，这是您想要的，并且也进行了说明.

Ok Psinyee, here is what you want, and also explained.

<script type="text/javascript">
   $(document).ready(function() {
       $('.equal').on('click', function() {
           // find coresponding dropdown
           // with select inside (this is the button ->parent is the td-> previous td)
           var crtDropdown = $('select', $(this).parent().prev('td'));
           if(crtDropdown.prop('selectedIndex') > 0) {
               // something is selected, not first option
               // change values for following selects
               // select ->parent td->parent tr->all next trs->select inside trs->set val to crtDropdown.val();
               crtDropdown.parent().parent().nextAll('tr').find('select').val(crtDropdown.val());
           }
       })
   });
</script>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<table>
    <tr>
        <td>
            <select class="dropDown" style="width:150px" name="rate_value_1">
                <option value="<?php echo $_SESSION['rate_value_1'] ;?>"><?php echo $_SESSION['rate_value_1'] ;?></option>
                <option value="Fixed Rate">Fixed Rate</option>
                <option value="Floating Rate">Floating Rate</option>
            </select>
        </td>
        <td><input type="image" src="equal_button.png" class="equal" /></td> 
    </tr>
    <tr>
        <td>
            <select class="dropDown" style="width:150px" name="rate_value_2">
                <option value="<?php echo $_SESSION['rate_value_2'] ;?>"><?php echo $_SESSION['rate_value_2'] ;?></option>
                <option value="Fixed Rate">Fixed Rate</option>
                <option value="Floating Rate">Floating Rate</option>
            </select>
        </td>
        <td><input type="image" src="equal_button.png" class="equal" /></td> 
    </tr>
    <tr>
        <td>
            <select class="dropDown" style="width:150px" name="rate_value_3">
                <option value="<?php echo $_SESSION['rate_value_3'] ;?>"><?php echo $_SESSION['rate_value_3'] ;?></option>
                <option value="Fixed Rate">Fixed Rate</option>
                <option value="Floating Rate">Floating Rate</option>
            </select>
        </td>
        <td><input type="image" src="equal_button.png" class="equal" /></td> 
    </tr>
    <tr>
        <td>
            <select class="dropDown" style="width:150px" name="rate_value_4">
                <option value="<?php echo $_SESSION['rate_value_4'] ;?>"><?php echo $_SESSION['rate_value_4'] ;?></option>
                <option value="Fixed Rate">Fixed Rate</option>
                <option value="Floating Rate">Floating Rate</option>
            </select>
        </td>
        <td><input type="image" src="equal_button.png" class="equal" /></td> 
    </tr>
</table>
</form>

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