Question

我知道这似乎是一个非常基本的问题，但我无法弄清楚如何将文本框的重点放在PageLoad上。

由于这是一个登录控件，因此我无法通过代码按照我习惯的方式单独控制每个文本框。

有人碰巧知道如何专注于控制。

史蒂夫

Answer 1

调整此项以符合您的要求......

protected void Page_Load(object sender, EventArgs e)
{
    string focus = "document.getElementById('" + Login1.ClientID + "_UserName').focus();";
    // the following assumes that your login page's type is 'Login' 
    // e.g. public partial class Login : Page ....
    ClientScript.RegisterStartupScript(typeof(Login), "uidFocus", focus, true);
}

Answer 2

Code Poet给出了正确的答案，但我不确定为什么它已被删除。

 string focus = "document.getElementById('" + Login1.ClientID + "_UserName').focus();";
ClientScript.RegisterStartupScript(typeof(<insert type your login page here, e.g. Login>), "uidFocus", focus, true);

这很有效，谢谢。

史蒂夫

Answer 3

只需给出Login控件焦点即可。

Login1.Focus();

或

Form.DefaultFocus = Login1.ClientID;

修改：或者，Login1.FindControl("UserName").Focus();或Form.DefaultFocus = Login1.FindControl("UserName").ClientID;可用于更准确地传达焦点。

完整来源：

<form id="form1" runat="server">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Login ID="Login1" runat="server">
</asp:Login>
</form>

protected void Page_Load(object sender, EventArgs e)
{
    Login1.Focus();
}

在IE6和Firefox 3.6中都适用于我。

很明显，调用.Focus（）会导致WebResource.axd为我呈现以下javascript。在代码隐藏中设置焦点时，将调用WebForm_AutoFocus('Login1')方法。

function WebForm_FindFirstFocusableChild(control) {
    if (!control || !(control.tagName)) {
        return null;
    }
    var tagName = control.tagName.toLowerCase();
    if (tagName == "undefined") {
        return null;
    }
    var children = control.childNodes;
    if (children) {
        for (var i = 0; i < children.length; i++) {
            try {
                if (WebForm_CanFocus(children[i])) {
                    return children[i];
                }
                else {
                    var focused = WebForm_FindFirstFocusableChild(children[i]);
                    if (WebForm_CanFocus(focused)) {
                        return focused;
                    }
                }
            } catch (e) {
            }
        }
    }
    return null;
}
function WebForm_AutoFocus(focusId) {
    var targetControl;
    if (__nonMSDOMBrowser) {
        targetControl = document.getElementById(focusId);
    }
    else {
        targetControl = document.all[focusId];
    }
    var focused = targetControl;
    if (targetControl && (!WebForm_CanFocus(targetControl)) ) {
        focused = WebForm_FindFirstFocusableChild(targetControl);
    }
    if (focused) {
        try {
            focused.focus();
            if (__nonMSDOMBrowser) {
                focused.scrollIntoView(false);
            }
            if (window.__smartNav) {
                window.__smartNav.ae = focused.id;
            }
        }
        catch (e) {
        }
    }
}
function WebForm_CanFocus(element) {
    if (!element || !(element.tagName)) return false;
    var tagName = element.tagName.toLowerCase();
    return (!(element.disabled) &&
            (!(element.type) || element.type.toLowerCase() != "hidden") &&
            WebForm_IsFocusableTag(tagName) &&
            WebForm_IsInVisibleContainer(element)
            );
}
function WebForm_IsFocusableTag(tagName) {
    return (tagName == "input" ||
            tagName == "textarea" ||
            tagName == "select" ||
            tagName == "button" ||
            tagName == "a");
}
function WebForm_IsInVisibleContainer(ctrl) {
    var current = ctrl;
    while((typeof(current) != "undefined") && (current != null)) {
        if (current.disabled ||
            ( typeof(current.style) != "undefined" &&
            ( ( typeof(current.style.display) != "undefined" &&
                current.style.display == "none") ||
                ( typeof(current.style.visibility) != "undefined" &&
                current.style.visibility == "hidden") ) ) ) {
            return false;
        }
        if (typeof(current.parentNode) != "undefined" &&
                current.parentNode != null &&
                current.parentNode != current &&
                current.parentNode.tagName.toLowerCase() != "body") {
            current = current.parentNode;
        }
        else {
            return true;
        }
    }
    return true;
}

Answer 4

如果不使用window.setTimeout（）方法，以上所有建议都无效。

System.Text.StringBuilder scriptLoader = new System.Text.StringBuilder();

scriptLoader.Append("var txtBox=document.getElementById('"+ this.myAppLogin.FindControl("UserName").ClientID+"');");
scriptLoader.Append("\n");
scriptLoader.Append("if (txtBox!=null ) window.setTimeout('txtBox.focus();', 0); ");

this.ClientScript.RegisterStartupScript(this.GetType(), "onLoadCall", scriptLoader.ToString(),true);

Answer 5

使用以下内容：

<form defaultfocus="Login1$UserName">

ASP.NET成员资格 - 登录控制 - TextBox焦点

5 个答案: