jQuery Mobile的VAL（）返回undefined changePage

Question

後，我有我的工作2頁：首先是其中的值正在從PHP服務器獲取的頁面和填充選擇/輸入和第二頁是一個對話框它從第一頁的隱藏輸入中提取值。第一個轉換打開對話框並正確提取值。之後，我將這些值保存在php會話中並重新加載第一頁。在此過程中，當我再次打開對話框時，jquery無法讀取val（）並顯示未定義。我不確定這是否是由於重新加載頁面問題或其他原因造成的。如果我刷新頁面，那麼它將再次正常工作。

<div data-role="page" id="page1"> 
    <div data-theme="a" data-role="header"> 
      ..... 
    <div data-role="navbar" data-iconpos="top"> 
      ..... 
    </div> 
    <div data-theme="c" id="cashtab" data-role="content"> 
     <div style="display:none" id="proddata" data=""></div> 
     <div style="display:none" id="prodstock" data=""></div> 
     <form id="mainsubmit" action="form.php" method="post" data-ajax="false"> 
      <input id="formproduct" type="hidden" name="product" value=""/> 
      <div id="productsearch" style="width:48%; float:left; margin-right:2%;"> 
       <label for="search">Search Product:</label><br/><br/> 
       <ul id="productautocomplete" data-role="listview" data-inset="true" data-filter="true" data-filter-placeholder="Select a product... (type at least 3 letters)" data-filter-theme="d"></ul> 
      </div> 
      <div id="packingselect" style=" width:23%; float:left; margin-right:2%;"> 
       <label for="packing">Select Packing:</label> 
       <select name="packing" id="packing" data-iconpos="left"> 
       </select> 
      </div> 
      <div id="qtyenter" style=" width:23%; float:left; margin-right:2%;"> 
       <label for="quantity">Select Qty:</label> 
       <input type="number" data-clear-btn="true" name="quantity" id="qty" value=""/> 
      </div><br/><br/><br/><br/><br/><br/><br/><br/> 
      <div style="display:inline-block; width:33%; margin-left:33%; margin-right:33%;"> 
       <a href="#page3" data-rel="dialog" data-role="button" >ADD</a> 
      </div> 
     </form> 
    </div> 
</div> 

<div data-role="page" id="page3" data-url="dialog.html" data-close-btn="right"> 
    <div data-role="header"> 
     <h1>Batch Selection</h1> 
    </div> 
    <div data-role="content"> 
    <div style="overflow:auto;"> 
    <table id="batchsel" style="border:1px;"> 
     <thead> 
     <tr> 
      <th></th> 
      <th>Batch No</th> 
      <th>Exp Date</th> 
      <th>Brate</th> 
      <th>Srate</th> 
      <th>Packing</th> 
      <th>Stock</th> 
      <th>Supplier</th> 
      <th>ST%</th> 
      <th>Bill Date</th> 
      <th>Bill No</th> 
      <th>btax</th> 
     </tr> 
     </thead> 
       <!--data populated from server once the values from first page is read properly. 
       <!-- currently not loading the second time as unable to fetch val() -- > 
     <tbody> 
     </tbody> 
    </table> 
    </div> 
    <div id="remainingdata"> 
     <p1 id="changeable_requirements"></p1> 
     <!-- function the send the checked checkboxes relavent info to store in session --> 
     <button id="saveprod" onclick="addProduct(); return false;">Add Product</button> 
    </div> 
    </div> 
</div> 


<script> 
$(document).on("pageinit", "#page1", function() { 

//for product select autopopulate -- working // 

$("#productautocomplete").live("listviewbeforefilter", function (e, data) { 
     var $ul = $(this),$input = $(data.input),value = $input.val(),html = ""; 
     $ul.html(""); 
     if (value && value.length > 2) { 
      $ul.html("<li><div class='ui-loader'><span class='ui-icon ui-icon-loading'></span></div></li>"); 
      $ul.listview("refresh"); 
     $.getJSON('ajax/getProductList.php', {term:$input.val()}, function(data) { 
     var items = []; 
     var str = ""; 
     for (var key in data) { 
      if (data.hasOwnProperty(key)) { 
       var value = data[key].value; 
       var label = data[key].label; 
       var stock = data[key].stock; 
       var proddata = data[key].data; 
       str += '<li code="'+value+'" name="'+label+'" stock="'+stock+'" data="'+proddata+'">'; 
       str += '<a data-ajax="false" rel="external">'+label+' [ '+stock+' ]</a>'; 
       str += '</li>'; 
      } 
     } 
     $ul.html(str); 
       $ul.listview("refresh"); 
       $ul.trigger("updatelayout"); 
     }); 
     } 
    }); 
    //end search 

    //on click set hidden input fields to be used in dialog box. -- working 

    $('#productautocomplete li').live('click', function(e) { 
    //--------------------fetch data ------------------------ 
    var id = $(this).attr('code'); 
    var name = $(this).attr('name'); 
    var data = $(this).attr('data'); 
    var stock = $(this).attr('stock'); 
    //add packaging type and unit info to div data 
    $('#proddata').attr('data',data); 
    //add currstock info to div 
    $('#prodstock').attr('data',stock); 
    //----------------------hide list 
    $('#productautocomplete li').hide(); 
    //----------------------place name in visible input box 
    $('#productsearch input').attr('value',name); 
    //----------------------place id in hidden input box for the actual form. 
    $('#formproduct').val(id); 
    //----------------------fill options for package + show select package div 
    var filteroptions = data.split(","); 
    $('#packing option').remove(); 
    for (var x=0; x<3 ; x++) { 
     var eachoption = filteroptions[x].split(":"); 
     //if unit wise option is less than that of stock show as option. 
     if (eachoption[0]!="0" && eachoption[0] <= stock.valueOf()) { 
     $('#packing').append($('<option>', { 
      value: eachoption[0]+':'+eachoption[1], 
      text : eachoption[1]+' [ '+eachoption[0]+' ] ' 
     })); 
     } 
    } 
    }); 
}); 

//this is where the problem lies .. 
//have tried with pageinit.. but that only calls it once. 
$(document).on("pageshow", "#page3", function() { 
    $('#batchsel tbody').empty(); 

    // !!!!!!!!!!!!!!!!!!!!!!! // !!!!!!!!!!!!!!!!!!!!!!! // 
    //doesnt fetch any of 4 following values after pageChange back to page1. 
    //not sure if this is due to how i'm reloading the page1. 
    //see function addProduct below. 

    var prodcode = $('#formproduct').val(); // 
    var prodstock = $('#prodstock').attr('data'); 
    var prodqty = $('#qty').val(); 
    var packing = $('#packing').find(":selected").val(); 

    //returns undefined 
    alert(prodcode); alert(packing); alert(prodqty); 

    //always ends here when dialog opens second time. 
    if (!prodcode || !packing || !prodqty) { 
     alert("Please give all required information"); 
     //does not close also when opens the second time. 
     $('#page3').dialog('close'); 
    } 

    var packinginfo = packing.split(":"); 
    var totalrequired = prodqty * packinginfo[0]; 
    //alert(packinginfo[1]);alert(totalrequired); 
    if (totalrequired > prodstock) { 
    alert("Not enough Stock"); 
    $('#page3').dialog('close'); 
    } else { 
    //------------------------------ Getting Batch Info --------------------------------------------------- 
    var rows = ''; 
    $.getJSON('ajax/getBatchDetails.php', {code:prodcode,pack:packinginfo[1],qty:totalrequired}, function(data) { 
     for (var key in data) { 
     if (data.hasOwnProperty(key)) { 
      //alert (data[key].Batch); 
      rows += '<tr><td><input type="checkbox" class="batchcheckbox" id="batchcheckbox_'+data[key].BatchId+'" value="'+data[key].BatchId+':'+data[key].Stock+'" onchange="resetRemainingQty(this.value);""/></td><td>' + data[key].Batch + '</td><td>' + data[key].ExDt +'</td><td>' + data[key].BRate + '</td><td>' + data[key].SRate + '</td><td>' + data[key].Pack + '</td><td>' + data[key].Stock + '</td><td>' + data[key].Supname + '</td><td>' + data[key].Stax + '</td><td>' + data[key].BillDt + '</td><td>' + data[key].BillNo + '</td><td>' + data[key].btax + '</td><tr>'; 
     } 
     } 
     $('#batchsel tbody').append(rows); 
     //add remaining amount in the data field of p1. 
     $('#remainingdata p1').attr('data',totalrequired); 
     $('#remainingdata p2').attr('data',totalrequired); 
     $('#remainingdata p1').html("<h4>Remaining Amount : "+totalrequired+"</h4>"); 
    }); 
    //---------------------------------------------end batch info display: ----------------------------------- 
    } 
}); 

function addProduct() { 
    //--------code info--------- 
    var prodcode = $("#formproduct").val(); // to send 
    //--------packing info--------------- 
    var packing = $('#packing').find(":selected").val(); 
    var packinginfo = packing.split(":"); 
    //-----------qty req --------------------- 
    var prodqty = $('#qty').val(); 
    var totalrequired = prodqty * packinginfo[0]; // to send 
    //-------------batch info ----------- 
    var allbatchids = ""; 
    $('.batchcheckbox').each(function() { 
    if($(this).is(':checked')){ 
     var data = $(this).val(); 
     var datasplit = data.split(":"); 
     var batchid = datasplit[0]; 
     allbatchids += batchid+":"; 
    } 
    }); 
    allbatchids = allbatchids.substring(0, allbatchids.length - 1); // to send 
    alert(prodcode+",,"+packinginfo[1]+",,"+totalrequired+",,"+allbatchids); 
    //-------------- send to server to save to session --------- 
    $.getJSON('ajax/saveProductSession.php', {code:prodcode,pack:packinginfo[1],qty:totalrequired,batch:allbatchids}, function(data) { 
    if (data.error == "1") { 
     alert(data.message); 
    } else { 

     /// !!!!!!!! !!!!!!!!!!!!!!! !!!!!!!!!!!!!!! 
     /// 
     /// the loads the page1. but jquery doesnt take val() after this. 
     ///tried multiple variations of this but to no effect. 
     ///removed all options.. redirect to main.php.. reloadpage:false.. etc. 
     ///Any other way to reload the page so that the dialog once open again can 
     ///get the values from the page1 again. 

     $.mobile.changePage("#page1", { reloadPage: true , dataUrl : "page1", reverse : true, changeHash: true }); 


    } 
    }); 
//  
// $.ajax({ 
// type: "POST", 
// url: "ajax/saveProductSession.php", 
// data: { code:prodcode,pack:packinginfo[1],qty:totalrequired,batch:allbatchids } 
// }).done(function() {}); 
} 
</script> 

Answer 1

好！我得到它的工作！無論如何感謝@Gajotres。步驟：

1a。通過changePage從main.php發送變量：

var prodcode = $('#formproduct').val(); 
var prodstock = $('#prodstock').attr('data'); 
var prodqty = $('#qty').val(); 
var packing = $('#packing').find(":selected").val(); 
$.mobile.changePage('batch.php', { 
    role: 'dialog', 
    data: {'prodcode': prodcode,'prodstock': prodstock, 'prodqty' : prodqty , 'packing' : packing}, 
    type: 'get' 
}); 

2a。將整個div id'page3'移動到一個名爲'batch.php'的新php頁面，我從PHP獲取變量並將其設置爲html div。

<?php 
    extract($_GET); 
    if (!$prodcode && !$prodstock && !$packing && !$prodqty) { 
     header('Location: '.DEF_SITEURL."main.php"); 
     exit; 
    } 
?> 
<div data-role="page" id="batchpage" data-url="batch.php" data-close-btn="right"> 

    <div data-role="header"> 
     <h1>Batch Selection</h1> 
    </div> 
    <div data-role="content"> 
    <div style="display:none;" id="batchprodcode" data="<?php echo $prodcode; ?>"></div> 
    <div style="display:none;" id="batchprodstock" data="<?php echo $prodstock; ?>"></div> 
    <div style="display:none;" id="batchpacking" data="<?php echo $packing; ?>"></div> 
    <div style="display:none;" id="batchqty" data="<?php echo $prodqty; ?>"></div> 
    <div style="overflow:auto;"> 
    <table id="batchsel" style="border:1px;"> 
     <thead> 
     <tr> 
      <th></th> 
      <th>Batch No</th> 
      <th>Exp Date</th> 
      <th>Brate</th> 
      <th>Srate</th> 
      <th>Packing</th> 
      <th>Stock</th> 
      <th>Supplier</th> 
      <th>ST%</th> 
      <th>Bill Date</th> 
      <th>Bill No</th> 
      <th>btax</th> 
     </tr> 
     </thead> 
     <tbody> 
     </tbody> 
    </table> 
    </div> 
    <div id="remainingdata"> 
     <p1 id="changeable_requirements"></p1> 
     <button id="saveprod" onclick="addProduct(); return false;">Add Product</button> 
    </div> 
    </div> 
</div> 

3a。然後，我只是將page3用於page3更改爲batch.php上創建的新div。腳本仍然在main.php上運行。

$(document).on("pageshow", "#batchpage", function() { 
    $('#batchsel tbody').empty(); 
    var prodcode = $('#batchprodcode').attr('data'); 
    var prodstock = $('#batchprodstock').attr('data'); 
    var prodqty = $('#batchqty').attr('data'); 
    var packing = $('#batchpacking').attr('data'); 
    ... 
});