HTML5里的placeholder属性
HTML代码
你也看见了,需要做的只是在文本框的声明标签上加入placeholder属性。完全不需要JavaScript来创造这种效果。
检查浏览器是否支持Placeholder属性
因为placeholder是一种新属性,很有必要检查一下你的浏览器是否支持它,比如IE6、IE8肯定是不支持的:
- function hasPlaceholderSupport() {
- var input = document.createElement('input');
- return ('placeholder' in input);
- }
如果用户的浏览器不支持placeholder特征,你需要借助MooTools, Dojo, 或其它JavaScript工具来实现它:
- /* mootools ftw! */
- var firstNameBox = $('first_name'),
- message = firstNameBox.get('placeholder');
- firstNameBox.addEvents({
- focus: function() {
- if(firstNameBox.value == message) { searchBox.value = ''; }
- },
- blur: function() {
- if(firstNameBox.value == '') { searchBox.value = message; }
- }
- });
用CSS美化placeholder
前一篇文章里我写了如何用CSS美化鼠标选择的文字。在进一步研究时我发现了另外一个有趣的CSS功能:CSS美化INPUT placeholder效果。下面让我来用简单的CSS代码美化文本框里的placeholder文字。
观看演示
CSS代码
火狐浏览器里的用法和谷歌浏览器里不太一样。它们的名称都很好理解:
- /* all */
- ::-webkit-input-placeholder { color:#f00; }
- ::-moz-placeholder { color:#f00; } /* firefox 19+ */
- :-ms-input-placeholder { color:#f00; } /* ie */
- input:-moz-placeholder { color:#f00; }
- /* individual: webkit */
- #field2::-webkit-input-placeholder { color:#00f; }
- #field3::-webkit-input-placeholder { color:#090; background:lightgreen; text-transform:uppercase; }
- #field4::-webkit-input-placeholder { font-style:italic; text-decoration:overline; letter-spacing:3px; color:#999; }
- /* individual: mozilla */
- #field2::-moz-placeholder { color:#00f; }
- #field3::-moz-placeholder { color:#090; background:lightgreen; text-transform:uppercase; }
- #field4::-moz-placeholder { font-style:italic; text-decoration:overline; letter-spacing:3px; color:#999; }
你可以控制placeholder文字的字体、颜色和风格。你甚至可以将文本框的placeholder以动画方式显示。 美化你的文本框都是些看起来很小的事情,但对于一些交互式的网站来说,成功的关键就在于细节。现在IE10里也只支持placeholder了,相信越来越多的人会使用这种原生的placeholder效果。
via:http://www.webhek.com/html5-placeholder?rel=http://geek.csdn.net

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