setAttribute不起作用

Question

此代码嵌套在ascx控件中。 onclientclick事件有效，没有错误，但标签文本没有改变？我错过了什么？

                <asp:Button 
                ID="btnUpload" runat="server" CssClass="Uploadbtn1"    OnClientClick="BePatient()" OnClick="btnUpload_Click" 
                Text="Upload" Width="62px"  align="center"/>
             <Label ID="Label1" ></Label>

            <br />
            <br />

            <asp:Label ID="ErrorMessageLbl" runat="server"></asp:Label>




            <script type="text/javascript" language="javascript">
            function BePatient() {

                    var lbl = document.getElementById('<%=ErrorMessageLbl.ClientID%>');
                    var lblText = lbl.getAttribute("innerText");
                    // var lblText = lbl.getAttribute("Text");                    // this did not work
                    //var lblText = lbl.getAttribute("innerHtml");               // this did not work
                    lbl.setAttribute(lblText, "Please be patient this will take awhile!");
                  }
            </script>   

Answer 1

你set an element's text的方式如下：

var lbl = document.getElementById('<%=ErrorMessageLbl.ClientID%>');
lbl.innerText = "Please be patient this will take awhile!";

如果出于某种原因你真的想要设置一个名为'innerText'的属性，那么你可以使用

var lbl = document.getElementById('<%=ErrorMessageLbl.ClientID%>');
lbl.setAttribute('innerText', 'Please be patient this will take awhile!');