Javascript jQuery 限制输入框中的文本
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Jquery limit text in input box
提问by kukipei
I want to limit number of chars in input text field.
我想限制输入文本字段中的字符数。
Code I'm using:
我正在使用的代码:
function limitText(field, maxChar){
if ($(field).val().length > maxChar){
$(field).val($(field).val().substr(0, maxChar));
}
}
Event is onkeyup. When I type some text in input field cursor stays on the end of text but focus is backed on start of the text so I can't see cursor.
事件是 onkeyup。当我在输入字段中输入一些文本时,光标停留在文本的末尾,但焦点回到文本的开头,所以我看不到光标。
What can be a problem.
有什么问题。
Browser is FF, on IE and chrome it is working correctly
浏览器是 FF,在 IE 和 chrome 上它工作正常
回答by Ties
you can also do it like this:
你也可以这样做:
<input type="text" name="usrname" maxlength="10" />
to achieve this with jQuery, you can do this:
要使用 jQuery 实现这一点,您可以这样做:
function limitText(field, maxChar){
$(field).attr('maxlength',maxChar);
}
回答by thecodeparadox
Your code is working in FF. Here is slightly modified version of your code:
您的代码正在 FF 中运行。这是您的代码的稍微修改版本:
$('input.testinput').on('keyup', function() {
limitText(this, 10)
});
function limitText(field, maxChar){
var ref = $(field),
val = ref.val();
if ( val.length >= maxChar ){
ref.val(function() {
console.log(val.substr(0, maxChar))
return val.substr(0, maxChar);
});
}
}