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Second time fails

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Data Source

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sitefinitysteve asked on 17 Dec 2011, 03:02 PM

Problem 1:
I think it's the way I have it setup, it shouldn't be initialized EVERY time...but I'm just not sure how to re-call the DS with the proper values. The problem is the error event KEEPs getting triggered even though it appears as if it works.
Video:http://screencast.com/t/xopirauz0W

Ok, so if I have the error event in there, it just hits it immediatly, if I remove the error event it WORKS the first time, then fails the second time.

function calculateResult() {

var result = 0.0;

var quantity = _quantityBox.value();

var fromList = $("#from-select").data("kendoDropDownList");

var toList = $("#to-select").data("kendoDropDownList");

var toDataItem = getWeightDataItem(toList.value());

//Calculate Result

$("#result").html("Calculating Result...one moment please");

var conversionDS = new kendo.data.DataSource({

transport: {

read: {

url: _oDataBasePath + "/USDA.svc/ConvertData?$format=json&$callback=callback&ndbno=" + toDataItem.NDB_No + "&seq=" + toDataItem.Seq + "&qty='" + quantity + "'&from='" + fromList.text() + "'&fromID=" + fromList.value() + "&to='" + toList.text() + "'&toID=" + toList.value(),

dataType: 'jsonp',

cache: false,

jsonp: false,

jsonpCallback: 'callback'

}

},

change: function () {

alert("works!");

var convertedData = this.data().d[0];

$("#result").html(convertedData);

}

}).read();

Live URL: http://dev.gourmetsleuth.com/calc.aspx

Problem 2:
So I tried seperating it out to the "data" property to see if that changed anything. However the data property is encoding variables on me
So given this:

data: {

$format : "json",

$callback: "callback",

ndbno: toDataItem.NDB_No,

seq: toDataItem.Seq,

qty: quantity,

from: "'" + fromList.text() + "'",

fromID: fromList.value(),

to: "'" + toList.text() + "'",

toID: toList.value()

},

the $format and $callback get changed to %24format which obviously fails....so no big deal, if I add them to the transport->read->url then it's smart enough to append the other data items without the duplicate question mark (great!)

However the oData\WCF service fails if I don't wrap my string variables in single quotes....but when I DO that in the above case it again encodes it, and fails :/

2 Answers, 1 is accepted

answered on 17 Dec 2011, 03:48 PM

Ok, so I figured it out by initializing the DS items only once and setting the urls later (with a fetch)...HOWEVER...i'm getting weirdness...watch

http://screencast.com/t/PEq2ylrsyQF

It appears that the "change" events which happen essentially at the same time it seems are getting confused... is "this.data" somehow "shared"...because the alert which I put in is triggering in the WRONG event handler. So is there something else I should be using instead of "this.data"?

_conversionDS = new kendo.data.DataSource({

transport: {

read: {

url: "",

dataType: 'jsonp',

cache: false,

jsonp: false,

jsonpCallback: 'callback'

}

},

change: function (e) {

var convertedData = this.data().d[0];

$("#result").html(convertedData);

}

});

_nutritionDS = new kendo.data.DataSource({

transport: {

read: {

url: "",

dataType: 'jsonp',

cache: false,

jsonp: false,

jsonpCallback: 'callback'

}

},

change: function (e) {

var nutritionData = this.data().d[0];

$("#nutrition-results").html(nutritionTemplate(nutritionData));

}

});