Android-html输入在软键盘打开时失去焦点(ASP.net)

Question

我在ASP.net上写了一个网页登录表单.

使用Nexus 4,安装Android 4.2.1,本机Chrome浏览器 - 当我点击<input>字段时,会出现软键盘,然后该字段立即失去焦点.我必须<input>在键盘已经打开的情况下再次单击该字段以实际输入文本.

这在桌面上的Chrome中不会发生.

我在ASP用户控件中有以下登录表单:

<asp:Login ID="login_form" runat="server" OnLoginError="OnFail" OnLoggedIn="OnLoggedIn" RenderOuterTable="false" RememberMeSet="True">
    <LayoutTemplate>

        <asp:Panel runat="server" DefaultButton="LoginButton" CssClass="members-login">
            <fieldset>
                <label for="UserName">Username</label>
                <asp:TextBox ID="username" placeholder="e.g. joebloggs12" runat="server"></asp:TextBox>

                <label for="Password">Password</label>
                <asp:TextBox ID="password" runat="server" placeholder="e.g. 1234" TextMode="Password"></asp:TextBox>

                <label id="RememberMe">Remember me</label>
                <asp:CheckBox ID="RememberMe" runat="server" />

                <asp:Button CssClass="button" ID="LoginButton" runat="server" CommandName="Login" Text="SUBMIT" />
            </fieldset>
        </asp:Panel>         
    </LayoutTemplate>
</asp:Login>

在浏览器中看起来像这样:

<div class="members-login" onkeypress="javascript:return WebForm_FireDefaultButton(event, &#39;ContentPlaceHolderDefault_contentBody_masterContent_login_form_LoginButton&#39;)">

    <fieldset>
        <label for="UserName">Username</label>
        <input name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$contentBody$masterContent$login_form$username" type="text" id="ContentPlaceHolderDefault_contentBody_masterContent_login_form_username" placeholder="e.g. joebloggs12" />

        <label for="Password">Password</label>
        <input name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$contentBody$masterContent$login_form$password" type="password" id="ContentPlaceHolderDefault_contentBody_masterContent_login_form_password" placeholder="e.g. 1234" />

        <label id="RememberMe">Remember me</label>
        <input id="ContentPlaceHolderDefault_contentBody_masterContent_login_form_RememberMe" type="checkbox" name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$contentBody$masterContent$login_form$RememberMe" checked="checked" />

        <input type="submit" name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$contentBody$masterContent$login_form$LoginButton" value="SUBMIT" id="ContentPlaceHolderDefault_contentBody_masterContent_login_form_LoginButton" class="button" />
    </fieldset>
</div>  

我怀疑是ViewState以某种方式窃取了焦点.但我尝试了event.stopPropogation()哪些没有帮助.

---

临时修复

现在我已经解决了一个hacky修复,<input>在点击后700毫秒迫使焦点回到元素上:

jQuery('input').bind('click',function(evt) {
    var focusClosure = (function(inputElem) {return function() {console.log(inputElem.focus());}}($(evt.target)));
    window.setTimeout(focusClosure, 700);
});

Answer 1

我发现这与ASP.net或ViewState无关.

当Android键盘出现时,将调整浏览器窗口的大小 - 触发resize事件.

我正在运行类似于以下内容:

// Move the navigation on resize
$(window).bind('resize', function() {
    if(maxWidth <= 710px) {
        $('.nav').after($('.main-content'));
    }
});

这改变了DOM中的导航.我想这会重绘DOM,因此导致DOM中的任何内容失去焦点.我在调整大小时停止了这种情况 - 使其仅在初始页面加载时发生.

Answer 2

我有一个类似的问题,我的方法是防止调整大小如果输入是焦点解决问题:

$(window).bind('resize', function() {
    if ($("input").is(":focus")) {
        // input is in focus, don't do nothing or input loses focus and keyboard dissapears
    } else {
        // do whatever you should do if resize happens
    }
});