Android jQuery Mobile show（）和hide（）Don'；我不能在安卓系统中工作

我试图在我调用ajax获取信息时显示一条“请稍候…”消息。基本上，用户输入他们的搜索词，点击搜索，我想在页面进行ajax调用时显示“请稍候…”，然后在调用完成后将其隐藏

我的jsp页面上有一个div，如下所示：

<div id="modalWindow">Please Wait...</div>

jQuery('#modalWindow').css({
    'text-align' : 'center',
    'font-size' : '20px'
}).hide();  //this is called when the page initially loads

jQuery('#modalWindow').show();    //I call this in the function that does the Ajax call

jQuery('#modalWindow').hide();    //I call this once the Ajax is done.

这是我的整个Ajax调用：

jQuery.ajax(
{
    url : urlContext + "/getItems.html",
    data :
    {
        txtItemReference : txtItemReference
    },
    dataType : "json",
    cache : false,
    async : false,
    timeout : 100000,
    success : function(jsonResponse)
    {
        if ( jsonResponse instanceof Object)
        {
            if (jQuery.isEmptyObject(jsonResponse))
            {
                createLocationDisplayPanel(false);
                createSimilarItemsPanel(false);
            }
            else if (jsonResponse['Locations'] != undefined)
            {
                responseArray = new Array();
                arrayStart = 0;
                intPage = 1;

                if (jsonResponse['Locations'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Locations'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                else
                {
                    responseArray = new Array();

                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                createLocationDisplayPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            else
            {
                if (jsonResponse['Items'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Items'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                else
                {
                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                createSimilarItemsPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            if (callback != undefined)
            {
                callback();
            }
        }
        else
        {
            alertLogout(document.URL);
        }
    },
    error : function(jsonResponse)
    {
        if (jsonResponse.hasOwnProperty('ERROR'))
        {
            alertError("There was no response from the server.");
        }
    }
});

jQuery.ajax(
{
    url : urlContext + "/getItems.html",
    data :
    {
        txtItemReference : txtItemReference
    },
    dataType : "json",
    cache : false,
    async : true,   //was false before
    timeout : 100000,
    success : function(jsonResponse)
    {
        if ( jsonResponse instanceof Object)
        {
            if (jQuery.isEmptyObject(jsonResponse))
            {
                createLocationDisplayPanel(false);
                createSimilarItemsPanel(false);
            }
            else if (jsonResponse['Locations'] != undefined)
            {
                responseArray = new Array();
                arrayStart = 0;
                intPage = 1;

                if (jsonResponse['Locations'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Locations'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                else
                {
                    responseArray = new Array();

                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                createLocationDisplayPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            else
            {
                if (jsonResponse['Items'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Items'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                else
                {
                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                createSimilarItemsPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            if (callback != undefined)
            {
                callback();
            }
        }
        else
        {
            alertLogout(document.URL);
        }
    },
    error : function(jsonResponse)
    {
        if (jsonResponse.hasOwnProperty('ERROR'))
        {
            alertError("There was no response from the server.");
        }
    }
});

jQuery.ajax(
{
url:urlContext+“/getItems.html”，
数据：
{
txtItemReference:txtItemReference
},
数据类型：“json”，
cache:false，
async:false，
超时：100000，
成功：函数（jsonResponse）
{
if（对象的jsonResponse实例）
{
if（jQuery.isEmptyObject（jsonResponse））
{
createLocationDisplayPanel（假）；
createSimilarItemsPanel（假）；
}
else if（jsonResponse['Locations']！=未定义）
{
responseArray=新数组（）；
arrayStart=0；
intPage=1；
if（jsonResponse['Locations'].length是否检查了jQuery是否在该点加载？请在脚本之前编写此代码

if (typeof jQuery == 'undefined') {  
    alert('jQuery is not loaded'); 
}

您可能需要组合脚本或找到一种方法来确保按照所需顺序加载脚本。
我发现问题在于Ajax调用的async属性：

jQuery.ajax(
{
    url : urlContext + "/getItems.html",
    data :
    {
        txtItemReference : txtItemReference
    },
    dataType : "json",
    cache : false,
    async : false,
    timeout : 100000,
    success : function(jsonResponse)
    {
        if ( jsonResponse instanceof Object)
        {
            if (jQuery.isEmptyObject(jsonResponse))
            {
                createLocationDisplayPanel(false);
                createSimilarItemsPanel(false);
            }
            else if (jsonResponse['Locations'] != undefined)
            {
                responseArray = new Array();
                arrayStart = 0;
                intPage = 1;

                if (jsonResponse['Locations'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Locations'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                else
                {
                    responseArray = new Array();

                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                createLocationDisplayPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            else
            {
                if (jsonResponse['Items'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Items'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                else
                {
                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                createSimilarItemsPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            if (callback != undefined)
            {
                callback();
            }
        }
        else
        {
            alertLogout(document.URL);
        }
    },
    error : function(jsonResponse)
    {
        if (jsonResponse.hasOwnProperty('ERROR'))
        {
            alertError("There was no response from the server.");
        }
    }
});

jQuery.ajax(
{
    url : urlContext + "/getItems.html",
    data :
    {
        txtItemReference : txtItemReference
    },
    dataType : "json",
    cache : false,
    async : true,   //was false before
    timeout : 100000,
    success : function(jsonResponse)
    {
        if ( jsonResponse instanceof Object)
        {
            if (jQuery.isEmptyObject(jsonResponse))
            {
                createLocationDisplayPanel(false);
                createSimilarItemsPanel(false);
            }
            else if (jsonResponse['Locations'] != undefined)
            {
                responseArray = new Array();
                arrayStart = 0;
                intPage = 1;

                if (jsonResponse['Locations'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Locations'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                else
                {
                    responseArray = new Array();

                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Locations'][x];
                    }
                }

                createLocationDisplayPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            else
            {
                if (jsonResponse['Items'].length <= 20)
                {
                    for (var x = arrayStart; x < jsonResponse['Items'].length; x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                else
                {
                    for (var x = arrayStart; x < (20 * intPage); x++)
                    {
                        responseArray[x] = jsonResponse['Items'][x];
                    }
                }

                createSimilarItemsPanel(jsonResponse, responseArray, txtItemReference, urlContext, callback);
            }
            if (callback != undefined)
            {
                callback();
            }
        }
        else
        {
            alertLogout(document.URL);
        }
    },
    error : function(jsonResponse)
    {
        if (jsonResponse.hasOwnProperty('ERROR'))
        {
            alertError("There was no response from the server.");
        }
    }
});

jQuery.ajax(
{
url:urlContext+“/getItems.html”，
数据：
{
txtItemReference:txtItemReference
},
数据类型：“json”，
cache:false，
async:true，//以前为false
超时：100000，
成功：函数（jsonResponse）
{
if（对象的jsonResponse实例）
{
if（jQuery.isEmptyObject（jsonResponse））
{
createLocationDisplayPanel（假）；
createSimilarItemsPanel（假）；
}
else if（jsonResponse['Locations']！=未定义）
{
responseArray=新数组（）；
arrayStart=0；
intPage=1；
if（jsonResponse['Locations'].length我测试了这个。我没有得到那个消息，所以实际上已经加载了jQuery。试试：alert（jQuery（'#modalWindow'）.length）；看看选择器是否失败。它应该是1。事实上，Android中不会发生常规的简单更改。我试着将输入框的值更改为“请稍候…”通过执行
jQuery（'input#txtItemReference'）.val（“请稍候…”）
它仍然不起作用。在Firefox中起作用，在Android中不起作用…它返回1，所以它就在那里。你能提供你的Ajax调用吗？也许这是一个同步问题？