使用jQuery锁定一个textarea? [英] locking a textarea using jQuery?

问题描述

如何使用jQuery锁定"文本区域，以便不能再输入任何字符?我不想禁用它，因为我想允许删除字符.

How do I "lock" a textarea with jQuery so that no more characters can be entered? I don't want to necessarily disable it since I want to allow characters to be deleted.

更新:哎呀..它刚来找我: 如果我将长度限制为说400个字符，那么当长度> 400时我可以使用以下内容:

update: oops..it just came to me: if I am limiting the length to say 400 characters then i can use the following when the length is > 400:

this.value = this.value.substring(0, 400);

这将减少多余的部分

推荐答案

以下是修改jquery.numeric插件的快速反应:)

following is quick contraption from modification of jquery.numeric plugin :)

它允许特殊键，但不允许用户输入任何内容.

It allows special keys but don't let user type anything.

<textarea id="txt" rows="5" cols="50"></textarea>

<script type="text/javascript">
$(document).ready(function(){
   $("#txt").keypress(function(e){
         var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
         // allow Ctrl+A
         if((e.ctrlKey && key == 97 /* firefox */) || (e.ctrlKey && key == 65) 
                                     /* opera */) return true;
         // allow Ctrl+X (cut)
         if((e.ctrlKey && key == 120 /* firefox */) || (e.ctrlKey && key == 88) 
                                     /* opera */) return true;
         // allow Ctrl+C (copy)
         if((e.ctrlKey && key == 99 /* firefox */) || (e.ctrlKey && key == 67) 
                                     /* opera */) return true;
         // allow Ctrl+Z (undo)
         if((e.ctrlKey && key == 122 /* firefox */) || (e.ctrlKey && key == 90) 
                                     /* opera */) return true;
         // allow or deny Ctrl+V (paste), Shift+Ins
         if((e.ctrlKey && key == 118 /* firefox */) || (e.ctrlKey && key == 86) 
                                     /* opera */
         || (e.shiftKey && key == 45)) return true;
         //page up, down, home end, left-right-up-down
         if(key > 32 && key < 40) return true;

         // if DEL or BACKSPACE is pressed
         return key == 46 || key == 8;

   });
});
</script>

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