我尝试了一些方法,但没有一个奏效。有人知道绕过这个的妙招吗?
<textarea placeholder='This is a line \n this should be a new line'></textarea>
<textarea placeholder='This is a line
should this be a new line?'></textarea> <!-- this works in chrome apparently -->
更新:它不工作在chrome。它只是textarea的宽度。
参见:http://jsfiddle.net/pdXRx/
我来这里是为了一个多行占位符解决方案,然后我意识到接受的解决方案不工作时,文本区域是在formik形式。
在这种情况下,解决方案就是模板字面量。它允许您指定多行文本字符串。
<textarea
cols={40}
placeholder={`day 1: Temple visit,
day 2: Jungle barbeque,\n
day 3: Waterfall visit in the evening,\n
day 4: Visit UNESCO World Heritage Site,\n
day 5: Art gallery show,\n
day 6: Visit grand swimming pool,\n
day 7: Visit to Blue fort`}
rows={20}
/>
源
我喜欢Jason Gennaro和Denis Golomazov的作品,但我想要一些在全球范围内更有用的东西。我已经修改了这个概念,这样它就可以添加到任何页面而不受影响。
http://jsfiddle.net/pdXRx/297/
<h1>Demo: 5 different textarea placeholder behaviors from a single JS</h1>
<h2>Modified behaviors</h2>
<!-- To get simulated placeholder with New Lines behavior,
add the placeholdernl attribute -->
<textarea placeholdernl> (click me to demo)
Johnny S. Fiddle
248 Fake St.
Atlanta, GA 30134</textarea>
<textarea placeholder='Address' placeholdernl> (click me to demo)
Johnny S. Fiddle
248 Fake St.
Atlanta, GA 30134</textarea>
<h2>Standard behaviors</h2>
<textarea placeholder='Address'> (delete me to demo)
Johnny S. Fiddle
248 Fake St.
Atlanta, GA 30134</textarea>
<textarea> (delete me to demo)
Johnny S. Fiddle
248 Fake St.
Atlanta, GA 30134</textarea>
<textarea placeholder='Address'></textarea>
javascript非常简单
<script>
(function($){
var handleFocus = function(){
var $this = $(this);
if($this.val() === $this.attr('placeholdernl')){
$this.attr('value', '');
$this.css('color', '');
}
};
var handleBlur = function(){
var $this = $(this);
if($this.val() == ''){
$this.attr('value', $this.attr('placeholdernl'))
$this.css('color', 'gray');
}
};
$('textarea[placeholdernl]').each(function(){
var $this = $(this),
value = $this.attr('value'),
placeholder = $this.attr('placeholder');
$this.attr('placeholdernl', value ? value : placeholder);
$this.attr('value', '');
$this.focus(handleFocus).blur(handleBlur).trigger('blur');
});
})(jQuery);
</script>
根据我所看到的三种不同技巧的组合,这似乎在我测试过的所有浏览器中都有效。
HTML:
<textarea placeholder="Line One Line Two Line Four"></textarea>
JS在HTML文件底部:
<script>
var textAreas = document.getElementsByTagName('textarea');
Array.prototype.forEach.call(textAreas, function(elem) {
elem.placeholder = elem.placeholder.replace(/\u000A/g,
' \
\
\
\n\u2063');
});
</script>
注意,额外的空间将导致一个干净的环绕,但必须有足够的空间,它将填补文本区域的宽度,我放置了足够的空间,它足以为我的项目,但你可以通过观察文本区域来生成它们。宽度和计算适当的基数。