JavaScript

Bill Payment

When the "Send" button is clicked, the webpage will perform basic validation,

then use the given details to call the API, with service name "billPayment".

If there are no errors with the information provided, the webpage will proceed to

parse a JSON string from "billPayment" into "responseObj"

We will be able to import useful data from these 3 sources, and to call a function and store the user ID and PIN.

Firstly, we will create a function which is used to populate drop-down menu.

The function is called addOption.

Then, we will populate drop-down menu when page loads.

And init user credentials.

The serviceName is billPayment.

And user does not require to enter userID and PIN.

Then the user will get and validate from the value. The user is required to enter value into the accountFrom, accountTo, transactionAmount, transactionReferenceNumber and narrative.

If accountFrom contains a value, then the system will display all the data which refers to the value.

Else, if the user does not enter any values, the showErrorModel function will be called and display a message: Account FROM cannot be blank.

If accountTo contains a value, then the system will display all the data which refers to the value.

Else, if the user does not enter any values, the showErrorModel function will be called and display a message: Account TO cannot be blank.

If transactionAmount contains a value, then the system will display all the data which refers to the value.

Else, if the user does not enter any values, the showErrorModel function will be called and display a message: Transaction Amount cannot be blank.

setUserID&setPIN

This code required data variable from Jsp, please refer to getUserID&getPIN above.

showErrorModal

This code required data variable showErrorModal from Jsp, please refer to showErrorModal above.

We will disable Send button

Then we will set some request parameters:

headerObj contains:

serviceName: serviceName
userID: userID
PIN: PIN
OTP: OTP

contentObj contains:

accountFrom: accountFrom
accountTo: accountTo
transactionAmount: transactionAmount
transactionReferenceNumber: transactionReferenceNumber
narrative: narrative

Then will use JSON to convert headerObj and contentObj into var header and var content.

JSP

This code required data variable from Jsp, please refer to Jsp above.

Set up http request.

If xmlHttp is equals to nothing, the web page will display an alert message:"Browser does not support HTTP request."

If xmlHttp is not equal to nothing, the web page will return data from the url and the header."

The timeout will be 5000s.

xmlHttp

This code required data variable xmlHttp from Jsp, please refer to xmlHttp above.

ApiURL

This code required data variable ApiURL from Jsp, please refer to ApiURL above.

Setup http event handlers。If globalerrorID = "010041", return OTP. Else if globalerrorID not = "010000", return error details.

onreadystatechange

This code required data variable onreadystatechange from Jsp, please refer to onreadystatechange above.

xmlHttp

This code required data variable xmlHttp from Jsp, please refer to xmlHttp above.

showOTPModel

This code required data variable showOTPModel from Jsp, please refer to showOTPModel above.

showErrorModal

This code required data variable showErrorModal from Jsp, please refer to showErrorModal above.

Get all the necessary data.

Display all the necessary data.

We will enable "Send" button.

Once the time is out, it will show error modal: "Timeout invoking API."

Then send the http request.

xmlHttp

This code required data variable xmlHttp from Jsp, please refer to xmlHttp above.

ontimeout

This code required data variable ontimeout from Jsp, please refer to ontimeout above.

showErrorModall

This code required data variable showErrorModal from Jsp, please refer to showErrorModal above.

Button will be disabled when there is an error occurs.

OTP model update button clicked

setOTP

This code required data variable setOTP from Jsp, please refer to setOTP above.

Overview of billPayment

<h2 class="page-header" style="color:#937851">Bill Payment</h2>

<h3 style="color:#937851">Input</h3>

</div>

<button type="reset" class="btn btn-default">Clear</button>

</div>

</div>

</div>

<label for="accountFrom" class="col-sm-4 control-label">Account FROM</label>

</div>

<b>(sender's account number)</b>

</div>

<label for="accountTo" class="col-sm-4 control-label">Account TO</label>

<Option value="" >Select an Option</option>

</select>

</div>

<label for="transactionAmount" class="col-sm-4 control-label">Transaction Amount</label>

</div>

<label for="transactionReferenceNumber" class="col-sm-4 control-label">Transaction Reference Number</label>

</div>

<label for="narrative" class="col-sm-4 control-label">Narrative</label>

</div>

</form>

</div>

<h3 style="color:#937851">Output</h3>

</div>

<button type="reset" class="btn btn-default">Clear</button>

</div>

<label for="transactionID" class="col-sm-4 control-label">Transaction ID</label>

</div>

<label for="balanceBefore" class="col-sm-4 control-label">Balance Before</label>

</div>

<label for="balanceAfter" class="col-sm-4 control-label">Balance After</label>

</div>

</form>

</div>

<!-- javascript libraries

======================================== -->

$(document).ready(function () {

// function to populate drop-down menu

function addOption(){

var length = countBillingOrg();

for (var i=0; i < length;i++){

billingOrgName = retrieveBillingOrgName(i);

billingOrgAccountID = retrieveBillingOrgAccountID(i);

var optn = document.createElement("OPTION");

optn.setAttribute("value", billingOrgAccountID);

var t = document.createTextNode(billingOrgName);

optn.appendChild(t);

document.getElementById("Options").appendChild(optn);

}

// Populate drop-down menu when page loads

window.onload = addOption();

// init user credentials

document.getElementById("userID").value = getUserID();

document.getElementById("PIN").value = getPIN();

/*----------------------------------------

* [Send] button clicked

$("#Send").click(function (event) {

(function() {

// set service header values

var serviceName = "billPayment";

var userID = document.getElementById("userID").value;

setUserID(userID);

var PIN = document.getElementById("PIN").value;

setPIN(PIN);

// get and validate form values

var accountFrom = document.getElementById("accountFrom").value;

if (accountFrom === ""){

showErrorModal("Account FROM cannot be blank.");

return;

}

var accountTo = document.getElementById("Options").value;

if (accountTo === ""){

showErrorModal("Account TO cannot be blank.");

return;

}

var transactionAmount = document.getElementById("transactionAmount").value;

if (transactionAmount === ""){

showErrorModal("Transaction Amount cannot be blank.");

return;

}

var transactionReferenceNumber = document.getElementById("transactionReferenceNumber").value;

var narrative = document.getElementById("narrative").value;

// disable Send button

document.getElementById("Send").disabled = true;

// set request parameters

var headerObj = {

Header: {

serviceName: serviceName,

userID: userID,

PIN: PIN,

OTP: OTP

}

};

var contentObj = {

Content: {

accountFrom: accountFrom,

accountTo: accountTo,

transactionAmount: transactionAmount,

transactionReferenceNumber: transactionReferenceNumber,

narrative: narrative

}

};

var header = JSON.stringify(headerObj);

var content = JSON.stringify(contentObj);

// setup http request

var xmlHttp = new XMLHttpRequest();

if (xmlHttp === null){

alert("Browser does not support HTTP request.");

return;

}

xmlHttp.open("POST", getApiURL()+"?Header="+header+"&Content="+content, true);

xmlHttp.timeout = 5000;

// setup http event handlers

xmlHttp.onreadystatechange = function() {

if (xmlHttp.readyState === 4 && xmlHttp.status === 200) {

responseObj = JSON.parse(xmlHttp.responseText);

serviceRespHeader = responseObj.Content.ServiceResponse.ServiceRespHeader;

globalErrorID = serviceRespHeader.GlobalErrorID;

if (globalErrorID === "010041"){

showOTPModal();

return;

}

else if (globalErrorID !== "010000"){

showErrorModal(serviceRespHeader.ErrorDetails);

return;

}

// get data

transactionID = responseObj.Content.ServiceResponse.TransactionID._content_;

balanceBefore = responseObj.Content.ServiceResponse.BalanceBefore._content_;

balanceAfter = responseObj.Content.ServiceResponse.BalanceAfter._content_;

// display data

document.getElementById("transactionID").value = transactionID;

document.getElementById("balanceBefore").value = addCommas(balanceBefore);

document.getElementById("balanceAfter").value = addCommas(balanceAfter);

// enable Send button

document.getElementById("Send").disabled = false;

}

};

xmlHttp.ontimeout = function (e) {

showErrorModal("Timeout invoking API.");

return;

};

// send the http request

xmlHttp.send();

})();

});

/* ----------------------------------------

* error model close button clicked

$("#CloseError").click(function (event) {

(function() {

document.getElementById("Send").disabled = false;

})();

});

/* ----------------------------------------

* OTP model update button clicked

$("#UpdateOTP").click(function (event) {

(function() {

var OTP = document.getElementById("OTP").value;

setOTP(OTP, function() { // ensure OTP set before clicking Send

document.getElementById("Send").disabled = false;

document.getElementById("Send").click();

});

})();

});

</script>

You can download the "billPayment" function below.

billPayment

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