如果达到输入maxlength做某事

Question

输入字段的最大长度为11.我想在满足maxlength并且用户不断尝试输入时执行jQuery函数,因此它不会执行任何操作,而是显示消息.

请问你能指点一下吗？

提前致谢!

Answer 1

试试这个:当用户点击11个字符时,IT会发出警告.

$("input").on("keyup",function() {
  var maxLength = $(this).attr("maxlength");
  if(maxLength == $(this).val().length) {
    alert("You can't write more than " + maxLength +" chacters")
  }
})

演示

$("input").on("keyup",function() {
  var maxLength = $(this).attr("maxlength");
  if(maxLength == $(this).val().length) {
    alert("You can't write more than " + maxLength +" chacters")
  }
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input maxlength="11" />