Vertically aligning a checkbox

问题:

I have looked at the different questions regarding this issue, but couldn't find anything that works due to limitations in my markup.

My markup looks like so (unfortunately as this is generated by some backend, I am unable to change the markup).

<ul>        
    <li>
        <input type="checkbox" value="1" name="test[]" id="myid1">
        <label for="myid1">label1</label>
    </li>
    <li>
        <input type="checkbox" value="2" name="test[]" id="myid2">
        <label for="myid2">label1</label>
    </li>
</ul>

I need the checkbox to be on the right and centered vertically in the <li>

Currently, this is styled as:

li input{
   display: inline-block;
   float: right;
   margin-right: 10px;
}

I have tried using various values for vertical-align, but that doesn't seem to help. Also, in some cases the label can be very long and span multiple lines. The checkbox would still need to be able to vertically center itself when the height of the li is arbitrary.

How can I go about achieving this?

回答1:

Vertical alignment only works on inline elements. If you float it, then I don't think it is treated as part of that stream of inline elements any more.

Make the label an inline-block, and use vertical alignment on both the label and the input to align their middles. Then, assuming it is okay to have a specific width on the labels and checkboxes, use relative positioning instead of floating to swap them (jsFiddle demo):

input{
    width:20px;

    position:relative;
    left: 200px; 

    vertical-align:middle; 
}

label{  
    width:200px;       

    position:relative;
    left: -20px;

    display:inline-block;    
    vertical-align:middle; 
}

回答2:

Its not a perfect solution, but a good workaround.

You need to assign your elements to behave as table with display: table-cell

Solution: ^Demo

HTML:

<ul>        
    <li>
        <div><input type="checkbox" value="1" name="test[]" id="myid1"></div>
        <div><label for="myid1">label1</label></div>
    </li>
    <li>
        <div><input type="checkbox" value="2" name="test[]" id="myid2"></div>
        <div><label for="myid2">label2</label></div>
    </li>
</ul>

CSS:

li div { display: table-cell; vertical-align: middle; }

回答3:

<div>
    <input type="checkbox">
    <img src="/image.png" />
</div>

input[type="checkbox"]
{
    margin-top: -50%;
    vertical-align: middle;
}

回答4:

This works reliably for me. Cell borders and height added for effect and clarity:

.
.
.
<table>
   <tr>
     <td style="text-align:right; border: thin solid; height:50px">Some label:</td>
     <td style="border: thin solid;"><input type="checkbox" checked="checked" id="chk1" style="cursor:pointer; "><label for="chk1" style="margin-top:auto; margin-left:5px; margin-bottom:auto; cursor:pointer;">Check Me</label></td>
   </tr>
</table>            

回答5:

make input to block and float, Adjust margin top value.

HTML:

<div class="label">
<input type="checkbox" name="test" /> luke..
</div>

CSS:

/*
change margin-top, if your line-height is different.
*/
input[type=checkbox]{
height:18px;
width:18px;
padding:0;
margin-top:5px;
display:block;
float:left;
}
.label{
border:1px solid red;
}

Demo