css - 50个字符时文本框自动换行asp.net

Question

我有一个供用户输入的文本框，下面的代码是我如何创建文本框的。

<asp:TextBox ID="txtIncidentDesc" runat="server" Height="50px" Width="441px" Columns="4" Rows="8"></asp:TextBox>

我想当用户输入长文本时，比如

tttttttttttttttttttttttttttttttttttttttttttttttttttttttttt

每当它遇到 50 个字符时，它会自动换行

tttttttttttttttttttttttt

tttttttttttttttttttttttt

有人知道我的代码有什么问题吗？

提前致谢!

非常感谢您的意见和建议!

Answer 1

试试这个例子。它会为您提供线索并帮助您找到解决方案。

    var cnt = 1;
    function newline(text) {
        var val = document.getElementById(text).value;

        var t;
        if (cnt > 1)
            t = (val.length / 10 * 10) / cnt;
        else
            t = val.length;

        if (t == 10) {
            document.getElementById(text).value = val + '\n';
            cnt = cnt + 1;
        }
    }

<textarea id="tb" onkeypress="newline(this.id)" cols="30" rows="4"></textarea>