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Adding an else Statement to a Javascript dictionary key value pairs?

How can I add an "else" statement to the following dictionary with key/value pairs to handle any sort of ambiguity?
var inputArr = input.match(/[\d.]+/g).map(Number);
var inputAnswer = ""
inputArr.forEach(function(element, index){
var lookUp = {
"1":"611"
"2":"612"
"3":"613"
"":""
};
inputAnswer = lookUp[element];
}
return inputAnswer
});
As you can see, the key/value pairs are only programmed to handle "1","2","3", and "". How can I add another value to it which would return blank string ("") if it is passed any other value? Just want it to be dynamically set up to handle any sort of data. Thanks!

Using a simple ternary, combined with hasOwnProperty will let you do what you want.
Note: using a simple || check may not give the desired results, as it will return '' if falsey value is set in the lookUp object. For a demo of why / how this may not do what you expect, see this fiddle
var inputArr = input.match(/[\d.]+/g).map(Number);
var inputAnswer = ""
inputArr.forEach(function(element, index) {
var lookUp = {
"1":"611"
"2":"612"
"3":"613"
"":""
};
// If a defined value exists, return it, otherwise ''
inputAnswer = ( lookUp.hasOwnProperty(element) ) ? lookUp[element] : '';
}
return inputAnswer
});

how to find specific objects and put them in an array in javascript

I have this result in my script
'[{"region":"NCA","depprt":"Havana, Cuba"},{"region":"NCA","depprt":"Havana, Cuba"},{"region":"NCA","depprt":"Montego Bay, Jamaica"},{"region":"NCA","depprt":"Montego Bay, Jamaica"}]'
this is the code to get it.
var jsonList = '#Html.Raw(Json.Encode(ViewBag.chk))'
var jsList = JSON.stringify(jsonList);
for jsList I got above result.now I want to get all depprt where region is equal to NCA.how can I do that.

You can use the .filter() method for this.
var ncaList = jsonList.filter(function(obj){ return obj.region == "NCA"; });

Very simple. Iterate over the jList array and see if the region property matches your condition or not then append the item to your filtered array.
var filtered = [];
jList.forEach(function(item) {
if(item.region == 'NCA') {
filtered.push(item);
}
});

Just iterate over it:
var filteredDepprts = [];
jsList.forEach(function(element){
if(element.region == 'NCA'){
filteredList.push(element.depprt); //or element if you want to push the full object
}
});

The JSON.stringify method converts a JavaScript value to a string.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
When you want to convert a JSON string to a JavaScript value, use JSON.parse
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
var jsonList = '#Html.Raw(Json.Encode(ViewBag.chk))'
var jsList = JSON.parse(jsonList);
Using single quotes around your #Html.Raw, creates a string and not a JavaScript value. The filter method does not work on strings
Eventually you could use Array.prototype.filter Filter out each element in array, that matches your criteria.
https://developer.mozilla.org/nl/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Try map:
var obj= [];
for (i in jsonList) {
if (jsonList[i].region == "NCA") { obj.push(jsonList[i])};
}
https://jsfiddle.net/pd6hvn78/

javascript function returning issue

I want to return the var "source" value for all the element, now when I put the "source" out of each function, it become undefined.I want to return the whole source array. How to do that? any help would be truly appreciated -
function _getSource(){
var product = fpd.getProduct(true);
$(product[0].elements).each(function(i, elem) {
var source = elem.parameters['source'];
})
return source;
alert (source);
}

Assuming that you're actually after an array containing the source property of each element:
function _getSource(){
var product = fpd.getProduct(true);
return $(product[0].elements).map(function(i, elem) {
return elem.parameters['source'];
}).get(); // .get() turns jQuery collection into an array
}
.map is a very good replacement for a .each / push combo. It comes from functional languages where the "map" function just takes an array, transmutes each elements, and returns a new array of those transmuted results.
The final .get is not strictly necessary if you don't mind getting an array-like result back rather than a proper array.

When you write var source you are declaring a new variable scoped to the function of the each callback. Declare it outside and get rid of the var so you are just assigning instead of redeclaring, and you probably also want to build up an array and not just assign. Something like this:
function _getSource(){
var product = fpd.getProduct(true);
var sources = [];
$(product[0].elements).each(function() {
sources.push(elem.parameters['source']);
})
return sources;
}

source is only defined inside the each function because you var'd it there.
Try this instead:
function _getSource() {
return $(fpd.getProduct(true)[0].elements).map(function() {return this.parameters['source'];});
}

jQuery $.inArray() always return -1 with an array of object

I have an array of object, that contain key value pair of columnNames.
when i check if a particular columnName exists it alwayz returns -1
Here is an sample http://jsfiddle.net/trLkt/6/, Help will b appriciated

You're searching for string values in the columnModel array, but you're storing objects in it (columnModel.push({'colName': $(this).text()});). $.inArray() cannot decide by itself to compare against the colName property of each array element, it simply compares the value you're searching for against each array element.

Two things you can do:
Add strings to the array instead of objects using .push (as suggested by #lanzz), then $.inArray will work as you expect.
Alternatively, if you do need to store objects within the array (if for example you need to have multiple properties within each object) you would need to iterate over each object and see if the colName already exists:
var colExists = false;
var text = $(this).text();
$.each(columnModel, function(k, v) {
if(text == v['colName']) {
colExists = true;
}
});
Then change your check from if(colExists === -1) to if(!colExists).
Example
$(function () {
$('#ddlMain').change(function (event) {
$('option:selected', $(this)).each(function () {
var colExists = false;
var text = $(this).text();
$.each(columnModel, function(k, v) {
if(text == v['colName']) {
colExists = true;
}
});
if(!colExists) {
columnModel.push({'colName': $(this).text()});
alert($(this).text() + ' added to columnModel');
}
});
});
});

Convert an HTML form field to a JSON object with inner objects

Given the following HTML form:
<form id="myform">
Company: <input type="text" name="Company" value="ACME, INC."/>
First Name: <input type="text" name="Contact.FirstName" value="Daffy"/>
Last Name: <input type="text" name="Contact.LastName" value="Duck"/>
</form>
What is the best way serialize this form in javascript to a JSON object in the format:
{
Company:"ACME, INC.",
Contact:{FirstName:"Daffy", LastName:"Duck"}
}
Also note that there might be more than 1 "." sign in the field name.

I think that what you'd do is this: for each input, first split the name at the separators (the '.' characters). Now, you have an array of names. You can then iterate through that array, making sure that your target "assembly" object (and sub-objects) have containers every time you come across a new name segment. When the array has 1 element in it, you simply add the value.
$.fn.extractObject = function() {
var accum = {};
function add(accum, namev, value) {
if (namev.length == 1)
accum[namev[0]] = value;
else {
if (accum[namev[0]] == null)
accum[namev[0]] = {};
add(accum[namev[0]], namev.slice(1), value);
}
};
this.find('input, textarea, select').each(function() {
add(accum, $(this).attr('name').split('.'), $(this).val());
});
return accum;
});
// ...
var object = $('#myform').extractObject();
I just sort-of made that up so there might be a bug or two; I can't remember whether all the browsers have "slice" but I think they do.
(edit: I forgot the all-important call to split())

You can loop through the form fields by name, use String#split to split the names on dot, and build up your resulting structure. Concept code:
function serializeDeep(form) {
var rv, obj, elements, element, index, names, nameIndex, value;
rv = {};
elements = form.elements;
for (index = 0; index < elements.length; ++index) {
element = elements[index];
name = element.name;
if (name) {
value = $(element).val();
names = name.split(".");
obj = rv;
for (nameIndex = 0; nameIndex < names.length; ++nameIndex) {
name = names[nameIndex];
if (nameIndex == names.length - 1) {
obj[name] = value;
}
else {
obj = obj[name] = obj[name] || {};
}
}
}
}
return rv;
}
Note that that doesn't allow for fields with repeated names (which should create arrays), nor does it elegantly handle a situation where you use the names "foo" and "foo.bar". But it should get you started.

I have managed it this way:
$('#Myform').attr('onsubmit', 'test()');
function test() {
var obj = {};
obj.title =$('#title').prop('value');
console.log('title: '+obj.title);
obj.website =$('#website').prop('value');
console.log('website: '+obj.website);
obj.tags =$('#tags').prop('value').split(',');
console.log('tags: '+obj.tags);
do_something(JSON.stringify(obj));
}
Of course this can be done if you know what the names are, and I am in fact generating the table itself using Formation plug-in.

I created an example for this question by using plain js, please check developer tool console to see the data object!
jsfiddle example
var data = {};
var array = 'person.name.first'.split('.');
var value = 'myFirstName';
generateObj(data, array, value);
console.log(data);
function generateObj(obj, arr, val) {
if (arr.length === 1) {
obj[arr[0]] = val
return;
}
var restArr = arr.splice(1);
if (!obj[arr[0]]) {
obj[arr[0]] = {};
}
generateObj(obj[arr[0]], restArr, val);
}
solution:
transform each name string to array.
iterate through each array.
recursively call a method which create an obj and set this obj as the value of the property and pass this obj to the next recursion.

Create an object of that shape then use a JSON encoder to write it out.