JavaScript

Calculate Loan Installment

The function will be able to calculate out Monthly instalment， Maturity Date， Interest and Interest Rate by entering Product ID, Principle and Number of Months the user wants to borrow,

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

Put the value of getUserID() into the value of userID.
Put the value of getPIN() into the value of PIN.

getUserID&getPIN

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

We will create a function and a header. The header will contain servicename, userID, PIN.

serviceName: calculateLoanInstallment

Then we will get and validate those values we have so far. We will create a variable:

ProductID
Principle
NumberOfMonths

If the ProductID is equal to nothing, the error will be displayed as "ProductID cannot be blank."

If the Principle is equal to nothing, the error will be displayed as "Principle cannot be blank."

If the NumberOfMonths is equal to nothing, the error will be displayed as "NumberOfMonths 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:

ProductID: ProductID
Principle: Principle
NumberOfMonths: NumberOfMonths

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.

I will create a variable "instalmentResponse" and get all the data from InstallmentResponse from-->

--> responseObj.Content.ServiceResponse.InstallmentResponse

Get some necessary data:

MonthlyInstallment
MaturityDate
Interest
InterestRate

Display all the necessary data.

monthlyInstalment
maturityDate
interest
interestRate

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.

showErrorModal

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 calculateLoanInstalment

<h2 class="page-header" style="color:#937851">Calculate Loan Instalment</h2>

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

</div>

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

</div>

</div>

</div>

<label for="productID" class="col-sm-4 control-label">Product ID</label>

</div>

<label for="principle" class="col-sm-4 control-label">Principle</label>

</div>

<label for="numberOfMonths" class="col-sm-4 control-label">Number of Months</label>

</div>

</form>

</div>

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

</div>

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

</div>

<label for="monthlyInstalment" class="col-sm-4 control-label">Monthly Instalment</label>

</div>

<label for="maturityDate" class="col-sm-4 control-label">Maturity Date</label>

</div>

<label for="interest" class="col-sm-4 control-label">Interest</label>

</div>

<label for="interestRate" class="col-sm-4 control-label">Interest Rate</label>

</div>

</form>

</div>

<!-- javascript libraries

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

$(document).ready(function () {

// 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 = "calculateLoanInstallment";

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

setUserID(userID);

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

setPIN(PIN);

// get and validate form values

var ProductID = document.getElementById("productID").value;

if (ProductID === ""){

showErrorModal("Product ID cannot be blank.");

return;

}

var Principle = document.getElementById("principle").value;

if (Principle === ""){

showErrorModal("Principle cannot be blank.");

return;

}

var NumberOfMonths = document.getElementById("numberOfMonths").value;

if (NumberOfMonths === ""){

showErrorModal("Number of Months cannot be blank.");

return;

}

// 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: {

ProductID: ProductID,

Principle: Principle,

NumberOfMonths: NumberOfMonths

}

};

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.ServiceRespHeader;

globalErrorID = serviceRespHeader.GlobalErrorID;

if (globalErrorID === "010041"){

showOTPModal();

return;

}

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

showErrorModal(serviceRespHeader.ErrorDetails);

return;

}

// get data

instalmentResponse = responseObj.Content.ServiceResponse.InstallmentResponse;

monthlyInstalment = instalmentResponse.MonthlyInstallment;

maturityDate = instalmentResponse.MaturityDate;

interest = instalmentResponse.Interest;

interestRate = instalmentResponse.InterestRate;

// display data

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

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

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

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

// 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 "calculateLoanInstalment" function below.

calculateLoanInstalment

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