partiallyResolved: how to add clientside pagination

Submitted by robertlan on Wed, 10/01/2008 - 08:14.

I am new to dojo, just got a big headache :-( when working on client-side pagination. But I really love Dojo, and want to use it :-) .
The demo somewhere in forum is just not working in Dojo1.1. http://osdir.com/ml/web.dojo.devel/2006-10/msg00013.html

** Error found:
With coding and Json below, I can only go to next item, but then got a problem which actually already reported here in forum ( dojo datastore automatically combined (messed up?) with previous store fetched).
In console, it just showed combined page1 and page 2, but I can never navigate to page 3. Why ??

My final goal is to make a client-side page with navigation buttons(previous/next page), which I am planning to let it work with dojox.offline store.
Can anybody help me?

Json file (paging.txt): (MODIFIED: from a reply below, I deleted a trailing comma :-( at the end, now works both in IE and FF)

{"timestamp":1193692111,"items":[
{"namespace":"dijit","className":"dijit.ColorPalette1"},
{"namespace":"dijit","className":"dijit.ColorPalette2"},
{"namespace":"dijit","className":"dijit.ColorPalette3"},
{"namespace":"dijit","className":"dijit.ColorPalette4"},
{"namespace":"dijit","className":"dijit.ColorPalette5"},
{"namespace":"dijit","className":"dijit.ColorPalette6"},
{"namespace":"dijit","className":"dijit.ColorPalette7"},
{"namespace":"dijit","className":"dijit.ColorPalette8"},
{"namespace":"dijit","className":"dijit.ColorPalette9"},
{"namespace":"dijit","className":"dijit.ColorPalette10"},
{"namespace":"dijit","className":"dijit.ColorPalette11"},
{"namespace":"dijit","className":"dijit.ColorPalette12"},
{"namespace":"dijit","className":"dijit.ColorPalette13"},
{"namespace":"dijit","className":"dijit.ColorPalette14"},
{"namespace":"dijit","className":"dijit.ColorPalette15"},
{"namespace":"dijit","className":"dijit.ColorPalette16"},
{"namespace":"dijit","className":"dijit.ColorPalette17"},
{"namespace":"dijit","className":"dijit.ColorPalette18"},
{"namespace":"dijit","className":"dijit.ColorPalette19"},
{"namespace":"dijit","className":"dijit.ColorPalette20"}
],"identifier":"className","label":"className"}

.html file:

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<style type="text/css">
@import "../dojoroot/dojo/resources/dojo.css";
</style>
<style type="text/css">
@import "http://o.aolcdn.com/dojo/1.0.0/dojox/grid/_grid/tundraGrid.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dijit/themes/tundra/tundra.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dojo/resources/dojo.css"
body {
font-size: 0.9em;
font-family: Geneva, Arial, Helvetica, sans-serif;
}
.heading {
font-weight: bold;
padding-bottom: 0.25em;
}

#grid {
border: 1px solid #333;
width: 35em;
height: 30em;
}
</style>
<script type="text/javascript" src="../dojoroot/dojo/dojo.js" djConfig="isDebug: true,usePlainJson:true,parseOnLoad: true"></script>
<script type="text/javascript">
dojo.require("dojo.data.ItemFileReadStore");
dojo.require("dojo.parser");

var store = new dojo.data.ItemFileReadStore({jsId: 'store',url: "paging.txt" });

var pageSize = 1;
var request = null;
var outOfItems = false;

//Define a function that will be connected to a 'next' button
var onNext = function(){
//dojo.byId('show').innerHTML="";
if(!outOfItems){
request.start = pageSize + request.start;
store.fetch(request);
}
};
//Connect this function to the onClick event of the 'next' button
//Done through dojo.connect() generally.

//Define a function will be connected to a 'previous' button.
var onPrevious = function(){
//dojo.byId('show').innerHTML="";
if (request.start > 0){
request.start -= pageSize;
store.fetch(request);
}
}
//Connect this function to the onClick event of the 'previous' button
//Done through dojo.connect() generally.

//Define how we handle the items when we get it
var itemsLoaded = function(items, request){
if (items.length < pageSize){
//We have found all the items and are at the end of our set.
outOfItems = true;
}else{
outOfItems = false;
}
//Display the items in a table through the use of store.getValue() on the items and attributes desired. ...
dojo.byId('show').innerHTML="";
dojo.forEach(items, function(i){
dojo.byId('show').innerHTML+=store.getValue(i, "className") + "<hr />";
});

// show in console
var itemsList = "";
dojo.forEach(items, function(i){
itemsList += store.getValue(i, "className") + " ";
});
console.debug("All items are: " + itemsList);
/*
*/

}

//Do the initial request. Without a query, it should just select all items. The start and count limit the number returned.
request = store.fetch({ onComplete: itemsLoaded, start: 0, count: pageSize});

var buttonID1=dojo.byId('button1');
dojo.connect(buttonID1, "onclick", onPrevious);
var buttonID2=dojo.byId('button2');
dojo.connect(buttonID2, "onclick", onNext);
</script>

</head>

<body class="tundra">
<button id="button1"> previous</button>
<button id="button2"> next</button>

<div id='show'></div>
</body>

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resolved in Firefox only

Submitted by robertlan on Sat, 10/04/2008 - 06:22.

Aha...After struggling, resolved by myself. Though not full Dojo style, but works (in Dojo1.1).
I would work on to make a full connection on this with Dojox.offline;
1st bug: I can not disable buttons when at immediate begin/end; I think I should use some query to get full datastore size, then set correct functions to disable/enable buttons(still working on ...). :-)
2nd bug: not working in IE, but OK in firefox, can anybody tell me why?

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<style type="text/css">
@import "../dojoroot/dojo/resources/dojo.css";
   </style>
<style type="text/css">
@import "http://o.aolcdn.com/dojo/1.0.0/dojox/grid/_grid/tundraGrid.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dijit/themes/tundra/tundra.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dojo/resources/dojo.css";
</style>
<script type="text/javascript" src="../dojoroot/dojo/dojo.js" djConfig="isDebug: true,usePlainJson:true,parseOnLoad: true"></script>
<script type="text/javascript">
   dojo.require("dojo.data.ItemFileReadStore");
dojo.require("dojo.parser");

var store = new dojo.data.ItemFileReadStore({jsId: 'store',url: "paging.txt" });

var startPage=0;
var pageSize = 1;
var request = null;
var outOfItems = false;

//Define a function that will be connected to a 'next' button
function onNext(){
//dojo.byId('show').innerHTML="";
console.debug("you clicked button 'to next'");
if(!outOfItems){
   //console.debug(startPage);
   dojo.byId('button2').disabled="";
startPage += pageSize;
   //console.debug("after adding 1:"+startPage);
   request.start = startPage;
   //console.debug(request.start);
store.fetch(request);
}
   else
   {
dojo.byId('show').innerHTML="End of data!";
   dojo.byId('button2').disabled="true";
   }
if (request.start > 0){
   //console.debug(startPage);
   dojo.byId('button1').disabled="";
}
   else
   {
dojo.byId('show').innerHTML="Already beginning of data!";
   dojo.byId('button1').disabled="true";
   }
/*
*/
};
//Connect this function to the onClick event of the 'next' button
//Done through dojo.connect() generally.

//Define a function will be connected to a 'previous' button.
function onPrevious(){
//dojo.byId('show').innerHTML="";
console.debug("you clicked button 'to previous'");
if (request.start > 0){
   //console.debug(startPage);
   dojo.byId('button1').disabled="";
startPage -= pageSize;
   //console.debug("after adding 1:"+startPage);
   request.start = startPage;
   //console.debug(request.start);
store.fetch(request);
}
   else
   {
dojo.byId('show').innerHTML="Already beginning of data!";
   dojo.byId('button1').disabled="true";
   }
if(!outOfItems){
   //console.debug(startPage);
   dojo.byId('button2').disabled="";
}
   else
   {
   dojo.byId('button2').disabled="true";
   }
}
//Connect this function to the onClick event of the 'previous' button
//Done through dojo.connect() generally.

//Define how we handle the items when we get it
var itemsLoaded = function(items, request){
if (items.length < pageSize){
//We have found all the items and are at the end of our set.
outOfItems = true;
}else{
outOfItems = false;
}
//Display the items in a table through the use of store.getValue() on the items and attributes desired. ...
dojo.byId('show').innerHTML="";
dojo.forEach(items, function(i){
dojo.byId('show').innerHTML+=store.getValue(i, "className") + "<hr />";
});

// show in console
var itemsList = "";
dojo.forEach(items, function(i){
itemsList += store.getValue(i, "className") + " ";
});
console.debug("items are: " + itemsList);
}

//Do the initial request. Without a query, it should just select all items. The start and count limit the number returned.
request = store.fetch({ onComplete: itemsLoaded, start: 0, count: pageSize});
</script>

</head>

<body class="tundra">
<button id="button1" onclick="onPrevious();"> previous</button>
<button id="button2" onclick="onNext();"> next</button>

<div id='show'></div>
</body>

Rule of thumb: if you're

Submitted by Helmchen on Sat, 10/04/2008 - 06:34.

Rule of thumb: if you're working with JSON and it works everywhere but in IE, then you've got most likely a trailing comma in your JSON data. That's treated as a syntax error in IE.

In your case the comma is right before the closing bracket of your "items" array.

u'r completely right!

Submitted by robertlan on Sat, 10/04/2008 - 08:09.

Yes. You're completely right. Thanks!
Now it works for IE as well as FF. I just modified.

These codes below using another json file format works both in IE and FF too.

**********Still how to solve first bug? Can anybody add more codes into my code? I am not familiar with Dojo at all. :-)
quote from up: " 1st bug: I can not disable buttons when at immediate begin/end; I think I should use some query to get full datastore size, then set correct functions to disable/enable buttons(still working on ...). :-) "

pantry_items.json:

{ identifier: 'name',
items: [
{ name: 'page1', aisle: 'Mexican' },
{ name: 'page2', aisle: 'Mexican' },
{ name: 'page3', aisle: 'Mexican' },
{ name: 'page4', aisle: 'Mexican' },
{ name: 'page5', aisle: 'Mexican' },
{ name: 'page6', aisle: 'Mexican' },
{ name: 'page7', aisle: 'Mexican' },
{ name: 'page8', aisle: 'Mexican' },
{ name: 'page9', aisle: 'Mexican' },
{ name: 'page10', aisle: 'Mexican' },
{ name: 'page11', aisle: 'Mexican' }
]}

.html

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<style type="text/css">
@import "../dojoroot/dojo/resources/dojo.css";
   </style>
<style type="text/css">
@import "http://o.aolcdn.com/dojo/1.0.0/dojox/grid/_grid/tundraGrid.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dijit/themes/tundra/tundra.css";
@import "http://o.aolcdn.com/dojo/1.0.0/dojo/resources/dojo.css";
</style>
<script type="text/javascript" src="../dojoroot/dojo/dojo.js" djConfig="isDebug: true,usePlainJson:true,parseOnLoad: true"></script>
<script type="text/javascript">
   dojo.require("dojo.data.ItemFileReadStore");
dojo.require("dojo.parser");

var store = new dojo.data.ItemFileReadStore({ url: "pantry_items.json" });

var startPage=0;
var pageSize = 1;
var request = null;
var outOfItems = false;

//Define a function that will be connected to a 'next' button
function onNext(){
//dojo.byId('show').innerHTML="";
console.debug("you clicked button 'to next'");
if(!outOfItems){
   //console.debug(startPage);
   dojo.byId('button2').disabled=false;
startPage += pageSize;
   //console.debug("after adding 1:"+startPage);
   request.start = startPage;
   //console.debug(request.start);
store.fetch(request);
}
   else
   {
dojo.byId('show').innerHTML="End of data!";
   dojo.byId('button2').disabled=true;
   }
if (request.start > 0){
   //console.debug(startPage);
   dojo.byId('button1').disabled=false;
}
   else
   {
dojo.byId('show').innerHTML="Already beginning of data!";
   dojo.byId('button1').disabled=true;
   }
/*
*/
};
//Connect this function to the onClick event of the 'next' button
//Done through dojo.connect() generally.

//Define a function will be connected to a 'previous' button.
function onPrevious(){
//dojo.byId('show').innerHTML="";
console.debug("you clicked button 'to previous'");
if (request.start > 0){
   //console.debug(startPage);
   dojo.byId('button1').disabled=false;
startPage -= pageSize;
   //console.debug("after adding 1:"+startPage);
   request.start = startPage;
   //console.debug(request.start);
store.fetch(request);
}
   else
   {
dojo.byId('show').innerHTML="Already beginning of data!";
   dojo.byId('button1').disabled=true;
   }
if(!outOfItems){
   //console.debug(startPage);
   dojo.byId('button2').disabled=false;
}
   else
   {
   dojo.byId('button2').disabled=true;
   }
}
//Connect this function to the onClick event of the 'previous' button
//Done through dojo.connect() generally.

//Define how we handle the items when we get it
var itemsLoaded = function(items, request){
if (items.length < pageSize){
//We have found all the items and are at the end of our set.
outOfItems = true;
}else{
outOfItems = false;
}
//Display the items in a table through the use of store.getValue() on the items and attributes desired. ...
dojo.byId('show').innerHTML="";
dojo.forEach(items, function(i){
dojo.byId('show').innerHTML+=store.getValue(i, "name") + "<hr />";
});

// show in console
var itemsList = "";
dojo.forEach(items, function(i){
itemsList += store.getValue(i, "name") + " ";
});
console.debug("items are: " + itemsList);
}

//Do the initial request. Without a query, it should just select all items. The start and count limit the number returned.

var gotError = function(error, request){
alert("The request to the store failed. " + error);
}
//Invoke the search
request = store.fetch({
   onComplete: itemsLoaded,
start: 0,
count: pageSize,
onError: gotError
});
</script>

</head>

<body class="tundra">
<button id="button1" onclick="onPrevious();"> previous</button>
<button id="button2" onclick="onNext();"> next</button>

<div id='show'></div>
</body>

'object error' in IE if I refresh

Submitted by robertlan on Sat, 10/04/2008 - 08:18.

:-( another bug:
In localhost with Apache, for IE, if page refresh, then an 'object error ' ???!! FF is completely OK when page refresh.

'object error' in IE if I refresh

Submitted by robertlan on Sat, 10/04/2008 - 08:18.

:-( another bug:
In localhost with Apache, for IE, if page refresh, then an 'object error ' ???!! FF is completely OK when page refresh.
Why?

works with buttons: first/ previous/next/last number spinner

Submitted by robertlan on Fri, 10/10/2008 - 06:49.

this page works with buttons: first/ previous/next/last with a number spinner to select page.
updated: now works as for disable/enable buttons( a bug No.3 below)
Actually this widget works quite good for most situation, though some bugs.

Bug 1 remaining: I failed to use function regExpGen in numberspinner. So, extra number of js functions ...
Bug 2 remaining: this is tested only on 1 item per page.
Bug 3 remaining: dojit buttonDisable style can not apply. So I have to roll back to browser default.

Can anyone work to complete it? I'm a new js and dojoer.


<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <head>

                <style type="text/css">

                        @import "../dojoroot/dojo/resources/dojo.css";

        /*

                @import "../dojoroot/dojox/grid/_grid/tundraGrid.css";

        */

        @import "../dojoroot/dijit/themes/tundra/tundra.css";

                </style>                

                <script type="text/javascript" src="../dojoroot/dojo/dojo.js" djConfig="isDebug: true,usePlainJson:true,parseOnLoad: true"></script>

        <script type="text/javascript">

        //important: this example was tested only on 1 item per page, if multiple items per page, just change codes accordingly.

            dojo.require("dojo.data.ItemFileReadStore");

                dojo.require("dojo.parser");

                dojo.require("dijit.form.Button");

                dojo.require("dijit.form.NumberSpinner");       

var store = new dojo.data.ItemFileReadStore({ url: "pantry_items.json" }); 

//fetch all and judge number of items, have a 'fulllength';

var fulllength=null;

    var itemsLoadedAll = function(items, requestAll){

       fulllength=items.length;

           console.debug ("fulllength="+fulllength);

 dojo.byId('goToPage').constraints="{min:1,max:"+fulllength+",places:0}";

console.debug("numberSpinner constraints property is set to"+dojo.byId('goToPage').constraints);

      }

//requestAll;

var requestAll=store.fetch({

            onComplete: itemsLoadedAll,

                start: 0

                });

var spinnerCheck=function(){

 console.debug ("spinnerChecking is working...");

       if (dojo.byId('goToPage').value <1){

           dojo.byId('goToPage').value=1;

       }

       if(dojo.byId('goToPage').value>fulllength-1){// TODO: a bug here // regExpGen may be used.

           dojo.byId('goToPage').value=fulllength-1;

       }

}

                

        var startPage=0;

    var pageSize = 1;

    var request = null;

    var outOfItems = false;

</script>       

        </head>

        

<body class="tundra"><table border="0" cellspacing="10" cellpadding="5">

  <tr>

    <td><button dojoType="dijit.form.Button" id="button1">first

<script type="dojo/method" event="onClick">

onFirst();

</script>

</button>

</td>

    <td><button dojoType="dijit.form.Button" id="button2">previous

<script type="dojo/method" event="onClick">

onPrevious();

</script>

</button></td>

    <td><button dojoType="dijit.form.Button" id="button3">next

<script type="dojo/method" event="onClick">

onNext();

</script>

</button></td>

    <td><button dojoType="dijit.form.Button" id="button4">last

<script type="dojo/method" event="onClick">

onLast();

</script>

</button></td>

    <td>        <input dojoType="dijit.form.NumberSpinner"

                value="1"

                smallDelta="1"

                intermediateChanges="true"

                id="goToPage" 

                constraints={min:1,max:20000,places:0}

                onchange="spinnerCheck();"

                onmouseup="spinnerCheck();" />

<button dojoType="dijit.form.Button" id="goToPageButton">go!

<script type="dojo/method" event="onClick">

onGoToPage();

</script>

</button></td>

  </tr>

</table>

This is page:

<h1><span id='show'></span></h1>

</body>

        <script type="text/javascript">

//I just do not want to use dojo addOnLoad :-)

    //Define a function that will be connected to a 'first' button

    //Connect this function to the onClick event of the 'first' button

    //Done through dojo.connect() generally.

 var onFirst = function (){

//dojo.byId('show').innerHTML="";

console.debug("you clicked button 'to first'");

       if (request.start > 0){

           startPage = 0;

                   request.start = startPage;

                   //console.debug(request.start);

           store.fetch(request);

       }

    };

    //Define a function will be connected to a 'previous' button.

    //Connect this function to the onClick event of the 'previous' button

    //Done through dojo.connect() generally.

    var onPrevious = function (){

//dojo.byId('show').innerHTML="";

console.debug("you clicked button 'to previous'");

       if (request.start > 0){

           startPage -= pageSize;

                   request.start = startPage;

                   //console.debug(request.start);

           store.fetch(request);

       }

    }

    //Define a function that will be connected to a 'next' button

    //Connect this function to the onClick event of the 'next' button

    //Done through dojo.connect() generally.

 var onNext = function (){

//dojo.byId('show').innerHTML="";

console.debug("you clicked button 'to next'");

startPage += pageSize;

       if(startPage<fulllength){      

                   request.start = startPage;

                   //console.debug(request.start);

           store.fetch(request);

       }

    };

    //Define a function that will be connected to a 'last' button

    //Connect this function to the onClick event of the 'last' button

    //Done through dojo.connect() generally.

 var onLast = function (){

//dojo.byId('show').innerHTML="";

console.debug("you clicked button 'to Last'");

console.debug("fulllength="+fulllength);

       if(startPage<fulllength-1){

          startPage = fulllength-1;

                   request.start = startPage;

                   //console.debug(request.start);

           store.fetch(request);

                   }

    };

 var onGoToPage = function (){

//dojo.byId('show').innerHTML="";

console.debug("you clicked button 'go to page'");

//console.debug("fulllength="+fulllength);

          startPage = dojo.byId('goToPage').value-1;

                   request.start = startPage;

                   //console.debug(request.start);

           store.fetch(request);

    };

    //Done through dojo.connect() generally.

//define a function to control 

function EnableDisableButtonsCtrl(){

console.debug ("judging buttons");

       if (request.start > 0){

//console.debug ("Enabling buttons 1/2");

           

           dojo.byId('button1').disabled=false;

           dojo.byId('button2').disabled=false;

dojo.byId('button1').className="";

dojo.byId('button2').className="";

dojo.byId('button1').style.cursor="pointer";

dojo.byId('button2').style.cursor="pointer";

       }

           else

           {

//console.debug ("Disabling buttons 1/2");

           dojo.byId('button1').disabled=true;

           dojo.byId('button2').disabled=true;

/*

        dojo.byId('button1').style.bordercolor="#d5d5d5 #bdbdbd #bdbdbd #d5d5d5";

        dojo.byId('button1').style.background="#e4e4e4 url(images/buttonDisabled.png) top repeat-x";

        dojo.byId('button1').style.opacity="0.60"; 

*/

dojo.byId('button1').className="";

dojo.byId('button2').className="";

dojo.byId('button1').style.cursor="not-allowed";

dojo.byId('button2').style.cursor="not-allowed";

           }

       if(startPage<fulllength-1){

//console.debug ("Enabling buttons 3/4");

           dojo.byId('button3').disabled=false;

           dojo.byId('button4').disabled=false;

dojo.byId('button3').className="";

dojo.byId('button4').className="";

dojo.byId('button3').style.cursor="pointer";

dojo.byId('button4').style.cursor="pointer";

       }

           else

           {

//console.debug ("Disabling buttons 3/4");

           dojo.byId('goToPage').value=fulllength;

           dojo.byId('button3').disabled=true;

           dojo.byId('button4').disabled=true;

dojo.byId('button3').className="";

dojo.byId('button4').className="";

dojo.byId('button3').style.cursor="not-allowed";

dojo.byId('button4').style.cursor="not-allowed";

           }

}

    //Define how we handle the items when we get it

    var itemsLoaded = function(items, request){

       //Display the items in a table through the use of store.getValue() on the items and attributes desired.       ...

console.debug ("items are loading");

EnableDisableButtonsCtrl();

    dojo.byId('show').innerHTML="";

    dojo.forEach(items, function(i){

    dojo.byId('show').innerHTML+=store.getValue(i, "name") + "<hr />";

        });

// show in console

    var itemsList = "";

    dojo.forEach(items, function(i){

       itemsList += store.getValue(i, "name") + " ";

    });

    console.debug("items are: " + itemsList);

   }

    //Do the initial request.  Without a query, it should just select all items.  The start and count limit the number returned.

var gotError = function(error, request){

    alert("The request to the store failed. " +  error);

}

//Invoke the search

var    request = store.fetch({

            onComplete: itemsLoaded,

                start: 0,

                count: pageSize,

    onError: gotError

                });

           store.fetch(requestAll);// for IE/safari compatibility

                        </script>

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