如何使文本框变为只读状态

Question

我对asp.net中的文本框有疑问。 例如，我有一个文本：P-70101002-00089-0，我只希望该部分：“ 70101002”是只读的，而另一部分则是用户可以编辑的。 模板始终是相同的，只是数字有所变化。 有没有机会用asp.net或任何javascript做到这一点？ 谢谢

Answer 1

您可以这样尝试：

var x  = $('#myId').val().length;
$('#myId').on('keypress, keydown', function(event) {    
    if ((event.which != 37 && (event.which != 39))
        && ((this.selectionStart < x)
        || ((this.selectionStart == x) && (event.which == 8)))) {
        return false;
    }
});   

JSFIDDLE演示

Answer 2

我们可以使用隐藏的输入使其成为只读文本

 function eidturl() { var readOnlyLength = $('#page_name_field_hidden').val().length; $('#page_name_field').on('keypress, keydown', function(event) { if ((event.which != 37 && (event.which != 39)) && ((this.selectionStart < readOnlyLength) || ((this.selectionStart == readOnlyLength) && (event.which == 8)))) { return false; } }); } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input id="page_name_field" type="text" onclick="eidturl()" name="app_name" value="70101002" size="50" /> <input id="page_name_field_hidden" type="hidden" value="70101002" size="50" /> 

Answer 3

您可以尝试使用InputGroup进行Bootstrap

 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous"> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script> <label for="basic-url">Your vanity URL</label> <div class="input-group mb-3"> <div class="input-group-prepend"> <span class="input-group-text" id="basic-addon3">P-70101002-</span> </div> <input type="text" class="form-control" value="00089-0" id="basic-url" aria-describedby="basic-addon3"> </div>