问题
Is there a way I can show placeholder text inside an input tag of type=number?
Detailed Q: The property 'placeholder' of an HTML's input tag is used to show description about the input tag in the UI when the element is not focused - the descriptive text goes blank when the same field gets focus. The problem is no text is visible if the input type is made of type="number". I do have space limitations in my UI and cannot afford a label before the input tag.
Any suggestions?
回答1:
Placeholders aren't intended as labels for input. Placeholder should contain examples of valid input. So in case of a number input the only valid value for placeholder is a number.
But if you want to misuse the placeholder to save room you could just use a little JS to fix your problem.
<input placeholder="Amount" onfocus="this.type='number';">
PS Chrome Nightly seems to have no problem with combining number and placeholder.
来源：https://stackoverflow.com/questions/7401495/how-to-display-placeholders-text-in-html5s-number-typed-input