更改输入上的提交按钮不透明度:焦点

Question

我有一个搜索栏和一个图像作为submit按钮.我希望submit按钮的不透明度0.5处于正常状态,并且1.0当搜索栏打开时:focus.

这是我的HTML:

<form id='searchThis' action='/search' method='get' style='display: inline;'>
<input id='searchBox' name='q' onblur='if(this.value==&apos;&apos;)this.value=this.defaultValue;' onfocus='if(this.value==this.defaultValue)this.value=&apos;&apos;;' style='display:inline;font-family:Segoe UI, Microsoft Tai Le, trebuchet MS,&apos;lucida grande&apos;;width: 155px;color:#636363;' type='text' value='Search' vinput=''/>
<input id='submitsearch' alt='Search' height='20px' src='http://1.bp.blogspot.com/-Ab4nALwSEdw/T4LI1pym1LI/AAAAAAAABBA/_oQltx3svas/s320/search.png' style='display:inline; padding-left: 10px; margin-top:1px; position: absolute; opacity:0.5;' title='Search' type='image' width='20px'/>
</form>

但我不知道我是应该使用CSS还是Javascript而且我也不是很擅长.

谁能帮我吗？

Answer 1

CSS:

#submitsearch {
  opacity: 0.5;

     -moz-transition: opacity 0.5s;
      -ms-transition: opacity 0.5s;
       -o-transition: opacity 0.5s;
  -webkit-transition: opacity 0.5s;
          transition: opacity 0.5s;
}

#searchBox:focus + #submitsearch {
  opacity: 1.0
}