简单的方法来检查是否支持占位符? [英] Simple way to check if placeholder is supported?
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问题描述
我想在我的代码中使用 HTML5
placeholder
属性,如果用户的浏览器支持它,在窗体顶部打印字段名称。但我只想检查是否支持占位符,而不是用户使用的浏览器的版本/名称。
< body>
< script>
if(placeholderIsNotSupported){
< b>用户名< / b>;
}
< / script>
< input type =textplaceholder =Username>
< / body>
除了我不确定javascript位。感谢您的帮助!
解决方案
function placeholderIsSupported(){
var test =使用document.createElement( '输入');
return('placeholder'in test);
}
我使用了 jQuery版本作为起点。 (只要给出应有的抵用金额。)
I want to use the HTML5
"placeholder"
attribute in my code if the user's browser supports it otherwise just print the field name on top of the form. But I only want to check whether placeholder is supported and not what version/name of browser the user is using.
So Ideally i would want to do something like
<body>
<script>
if (placeholderIsNotSupported) {
<b>Username</b>;
}
</script>
<input type = "text" placeholder ="Username">
</body>
Except Im not sure of the javascript bit. Help is appreciated!
解决方案
function placeholderIsSupported() {
var test = document.createElement('input');
return ('placeholder' in test);
}
I used a jQuery-ized version as a starting point. (Just giving credit where it's due.)
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