如何在文本区域中使用不可删除的单词(部分文字) [英] how to have undeletable words(part of text) in textarea

问题描述

我正在开发一个应用，该应用需要无法删除的textarea中的一部分文本，而他们可以将其文本添加到textarea中.

I am developing an application which needs a part of text in the textarea undeletable while they can add their text to the textarea.

例如，当用户访问网页时，它具有一个文本区域，该文本区域具有该用户的文本{username}.用户可以添加更多文本，例如{username} hi the the earth is globe，但应该无法从该文本区域中删除{username}.

For example when user come to a web page it has a textarea which has a text {username} of that user. The user can add more text like {username} hi the the earth is globe but should be unable to delete {username} from that textarea.

我正在将Jquery用作javascript类，是否知道我们可以在Jquery中实现它?

I am using Jquery as the javascript class, any idea that we can achieve it in Jquery?

推荐答案

一点也不知道，但是我明白了，它仍然需要很多改进

Not sure at all but I got this and it still need to be improved a lot

<script>

$(function (){
    $('#txtarea').keyup(function (){check()});
})

var txt = "username"; 
//txt is reg exp

function check(){
    var txtarea = $('#txtarea');
    var val = $(txtarea).val();

    if(val.match('^'+txt)){
        //do nothing
    }
    else
    {
        $(txtarea).val(txt+" "+val);
    }
}
</script>
<textarea id="txtarea">username</textarea>
<a href="#"  onclick="check()">check</a>

[UPDATE]

<script>

$(function (){
    $('#txtarea').keyup(function (){check()});
})

var txt = "username"; 
//txt is reg exp

function check(){
    var txtarea = $('#txtarea');
    var val = $(txtarea).val();

    if(val.match('^'+txt)){
        //do nothing
    }
    else
    {
        //this is quite a bit flawed
        //and i m terrible with regex
        //do try to become creative
        val = val.replace('usernam', '');
        val = val.replace('userna', '');
        val = val.replace('usern', '');
        val = val.replace('user', '');
        val = val.replace('use', '');
        val = val.replace('us', '');
        val = val.replace('u', '');

        $(txtarea).val(txt+" "+val);
    }
}
</script>
<textarea id="txtarea">username</textarea>
<a href="#"  onclick="check()">check</a>

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