javascript 如何使用纯javascript防止输入字段中的空格
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/32366300/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How prevent whitespace in input field with plain javascript
提问by Alexandre Thebaldi
I have an username input field and trying to prevent user fill them with white spaces.
我有一个用户名输入字段并试图阻止用户用空格填充它们。
<input type="text" name="username" />
i do this and whitespace isn't blocked
我这样做并且空格没有被阻止
var
field = document.querySelector('[name="username"]');
field.addEventListener('keypress', function ( event ) {
var
key = event.keyCode;
return (key !== 32);
});
回答by fuyushimoya
Use event.preventDefaultto prevent its default behavior.
使用event.preventDefault来防止其默认行为。
var field = document.querySelector('[name="username"]');
field.addEventListener('keypress', function ( event ) {
var key = event.keyCode;
if (key === 32) {
event.preventDefault();
}
});<input type="text" name="username" />If you want to use the return false;, then you should use the onkeypressof the input instead, jsfiddle
如果你想使用return false;，那么你应该使用onkeypress输入的 ，jsfiddle
field.onkeypress = function(e) {
var key = e.keyCode;
return (key !== 32);
};
回答by Mr. B
Modify the input like:
修改输入，如：
<input type="text" name="username" onkeypress="CheckSpace(event)"/>
Then the javascript is:
然后javascript是：
<script type="text/javascript">
function CheckSpace(event)
{
if(event.which ==32)
{
event.preventDefault();
return false;
}
}
回答by Keith M
Try checking for all the different kinds of whitespaces listed here Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML?
尝试检查此处列出的所有不同类型的空格是否还有其他空格代码，例如 表示半空格、em-空格、en-空格等在 HTML 中有用？
So you code would be:
所以你的代码是：
var field = document.querySelector('[name="username"]');
field.addEventListener('keypress', function ( event ) {
var
key = event.keyCode;
return (key !== 32 && key !== 160 && key != 5760 && key != 8192 && key != 8192 && key != 8194 && key != 8195 && key != 8196 && key != 8197 && key != 8198 && key != 8199 && key != 8200 && key != 8201 && key != 8202 && key != 8232 && key != 8233 && key != 8239 && key != 8287 && key != 12288);
});
Here is the complete list of all the different kinds of whitespaces: https://en.wikipedia.org/wiki/Whitespace_character#Spaces_in_Unicode
以下是所有不同类型空格的完整列表：https: //en.wikipedia.org/wiki/Whitespace_character#Spaces_in_Unicode
