Issue with javascript array variables

Issue with javascript array variables - javascript

I am using javascript in my app which is a rhino javascript engine. I like to use array for an array.
The following code is my actual working code.
while (input.hasNext()) {
var data = input.next();
var new_data = {};
var i = 0;
while(i<data.get('total_entries')){
new_data.entries = data.get('total_entries');
new_data.id = data.get('out').get(i).get('id');
output.write(new_data);
i++;
}
}
I need to create array for new_data[].
while (input.hasNext()) {
var data = input.next();
var new_data[] = {};
var i = 0;
while(i<data.get('total_entries')){
new_data[i].entries = data.get('total_entries');
new_data[i].id = data.get('out').get(i).get('id');
output.write(new_data[i]);
i++;
}
}
But its not working. So, help me to create array variable in it.
Thanks.

You mean something like this:
while (input.hasNext()) {
var data = input.next();
var new_data = [];
var i = 0;
while(i<data.get('total_entries')){
new_data.push({entries: data.get('total_entries'), id: data.get('out').get(i).get('id')});
output.write(new_data[i]);
i++;
}
}

var new_data[] = {};
First of all, that's invalid JavaScript.
new_data[i]
Looks like you want new_data to be an array of objects. Why not declare it as one and add objects on every iteration of the while loop:
var new_data = [];
while(...){
new_data.push({
entries: ...
id: ...
});
}

Related

unwanted keys in JSON object

hi i am creating a JSON object after executing a loop. the problem is the JSON object have additional keys. i don't want that keys. that keys are generated by me. for arraigning the json according my requirement. this is code i am using for create my JSON object
var bankdata = data;
var updatebankdata = {}
for (var key in bankdata) {
var id = +key.substr(key.length - 1);
if (isNaN(id)) {
updatebankdata[0] = updatebankdata[0] || {};
updatebankdata[0][key] = bankdata[key];
} else {
var uniqid=$("#bankaccount"+id).attr("uniq_id");
updatebankdata[id] = updatebankdata[id] || {};
var field = key.substring(0, key.length - 1);
updatebankdata[id][field] = bankdata[key];
updatebankdata[id]["uniquid"] = uniquid;
}
}
return updatebankdata;
}
my bank data is like
{bankname1: "new", micrcode1: "mkkk", comments1: "commentsfvfdv", bankname2: "bankfgname", micrcode2: "micrfgcode"…}
i want to change it into like this way
[{bankname1: "new", micrcode1: "mkkk", comments1:
"commentsfvfdv"},{bankname2: "bankfgname", micrcode2: "micrfgcode"}]
but still it getting like this .its not good
{"0":{bankname1: "new", micrcode1: "mkkk", comments1:
"commentsfvfdv"},"1":{bankname2: "bankfgname", micrcode2: "micrfgcode"}
what is the mistake in my code?

You need to use an array instead of an object. Like so:
function func(data) {
var bankdata = data;
var updatebankdata = []; // ARRAY instead of Object
for (var key in bankdata) {
var id = +key.substr(key.length - 1);
if (isNaN(id)) {
updatebankdata[0] = updatebankdata[0] || {};
updatebankdata[0][key] = bankdata[key];
} else {
var uniqid=$("#bankaccount"+id).attr("uniq_id");
updatebankdata[id] = updatebankdata[id] || {};
var field = key.substring(0, key.length - 1);
updatebankdata[id][field] = bankdata[key];
updatebankdata[id]["uniquid"] = uniqid; // CHANGED to "uniqid" to match variable declaration above, not the key on the left is still "uniquid"
}
}
return updatebankdata;
}
Then you can get result like:
JSON.stringify(func({name: 'someval', val: 123}));
"[{"name":"someval","val":123}]"

assign
var updatebankdata = [];
then push your object to array like this
updatebankdata.push(yourObject)

SCRIPT28: Out of stack space

Getting stack out of space in IE 10,11 when I try encode a array of data to Json and store it into an array
var SelPeriod = Ext.getCmp('SelectedPeriodGrid');
SelPerioddata = [];
var PeriodsSelected = SelPeriod.getStore('MarkettrackDrillDownPeriods').getRange();
for (var i = 0; i < PeriodsSelected.length; i++) {
SelPerioddata.push(PeriodsSelected[i]);
}
var SelPerioddatajson = [];
SelPerioddatajson = Ext.JSON.encod(SelPerioddata);

Try using only the record's data, like:
SelPerioddata.push(PeriodsSelected[i].data);
You can also rewrite this like:
var selPeriod = Ext.getCmp('SelectedPeriodGrid'),
periodsSelected = selPeriod.getStore('MarkettrackDrillDownPeriods').getRange(),
selPerioddatajson = Ext.JSON.encode(periodsSelected.map(function(record) {
return record.data;
}));

array object manipulation to create new object

var actual = [
{"country":"UK","month":"JAN","SR":"John P","AC":"24","PR":"2","TR":1240},
{"country":"AUSTRIA","month":"JAN","SR":"Brad P","AC":"64","PR":"12","TR":1700},
{"country":"ITALY","month":"JAN","SR":"Gim P","AC":"21","PR":"5","TR":900},
{"country":"UK","month":"FEB","SR":"John P","AC":"14","PR":"4","TR":540},
{"country":"AUSTRIA","month":"FEB","SR":"Brad P","AC":"24","PR":"12","TR":1700},
{"country":"ITALY","month":"FEB","SR":"Gim P","AC":"22","PR":"3","TR":600},
{"country":"UK","month":"MAR","SR":"John P","AC":"56","PR":"2","TR":1440},
{"country":"AUSTRIA","month":"MAR","SR":"Brad P","AC":"24","PR":"12","TR":700},
{"country":"ITALY","month":"MAR","SR":"Gim P","AC":"51","PR":"5","TR":200}
];
var expect = [
{month:"JAN",val: {"UK":"24","AUSTRIA":"64","ITALY":"21"}},
{month:"FEB",val: {"UK":"14","AUSTRIA":"24","ITALY":"22"}},
{month:"MAR",val: {"UK":"56","AUSTRIA":"24","ITALY":"51"}}
];
I have array of objects which i need to reshape for one other work. need some manipulation which will convert by one function. I have created plunker https://jsbin.com/himawakaju/edit?html,js,console,output
Main factors are Month, Country and its "AC" value.

Loop through, make an object and than loop through to make your array
var actual = [
{"country":"UK","month":"JAN","SR":"John P","AC":"24","PR":"2","TR":1240},
{"country":"AUSTRIA","month":"JAN","SR":"Brad P","AC":"64","PR":"12","TR":1700},
{"country":"ITALY","month":"JAN","SR":"Gim P","AC":"21","PR":"5","TR":900},
{"country":"UK","month":"FEB","SR":"John P","AC":"14","PR":"4","TR":540},
{"country":"AUSTRIA","month":"FEB","SR":"Brad P","AC":"24","PR":"12","TR":1700},
{"country":"ITALY","month":"FEB","SR":"Gim P","AC":"22","PR":"3","TR":600},
{"country":"UK","month":"MAR","SR":"John P","AC":"56","PR":"2","TR":1440},
{"country":"AUSTRIA","month":"MAR","SR":"Brad P","AC":"24","PR":"12","TR":700},
{"country":"ITALY","month":"MAR","SR":"Gim P","AC":"51","PR":"5","TR":200}
];
var outTemp = {};
actual.forEach(function(obj){ //loop through array
//see if we saw the month already, if not create it
if(!outTemp[obj.month]) outTemp[obj.month] = { month : obj.month, val: {} };
outTemp[obj.month].val[obj.country] = obj.AC; //add the country with value
});
var expected = []; //convert the object to the array format that was expected
for (var p in outTemp) {
expected.push(outTemp[p]);
}
console.log(expected);

Iterate through array and create new list
var actual = [
{"country":"UK","month":"JAN","SR":"John P","AC":"24","PR":"2","TR":1240},
{"country":"AUSTRIA","month":"JAN","SR":"Brad P","AC":"64","PR":"12","TR":1700},
{"country":"ITALY","month":"JAN","SR":"Gim P","AC":"21","PR":"5","TR":900},
{"country":"UK","month":"FEB","SR":"John P","AC":"14","PR":"4","TR":540},
{"country":"AUSTRIA","month":"FEB","SR":"Brad P","AC":"24","PR":"12","TR":1700},
{"country":"ITALY","month":"FEB","SR":"Gim P","AC":"22","PR":"3","TR":600},
{"country":"UK","month":"MAR","SR":"John P","AC":"56","PR":"2","TR":1440},
{"country":"AUSTRIA","month":"MAR","SR":"Brad P","AC":"24","PR":"12","TR":700},
{"country":"ITALY","month":"MAR","SR":"Gim P","AC":"51","PR":"5","TR":200}
];
var newList =[], val;
for(var i=0; i < actual.length; i+=3){
val = {};
val[actual[i].country] = actual[i]["AC"];
val[actual[i+1].country] = actual[i+1]["AC"];
val[actual[i+2].country] = actual[i+2]["AC"];
newList.push({month: actual[i].month, val:val})
}
document.body.innerHTML = JSON.stringify(newList);

This is the correct code... as above solution will help you if there are 3 rows and these will be in same sequnece.
Here is perfect solution :
var actual = [
{"country":"UK","month":"JAN","SR":"John P","AC":"24","PR":"2","TR":1240},
{"country":"AUSTRIA","month":"JAN","SR":"Brad P","AC":"64","PR":"12","TR":1700},
{"country":"ITALY","month":"JAN","SR":"Gim P","AC":"21","PR":"5","TR":900},
{"country":"UK","month":"FEB","SR":"John P","AC":"14","PR":"4","TR":540},
{"country":"AUSTRIA","month":"FEB","SR":"Brad P","AC":"24","PR":"12","TR":1700},
{"country":"ITALY","month":"FEB","SR":"Gim P","AC":"22","PR":"3","TR":600},
{"country":"UK","month":"MAR","SR":"John P","AC":"56","PR":"2","TR":1440},
{"country":"AUSTRIA","month":"MAR","SR":"Brad P","AC":"24","PR":"12","TR":700},
{"country":"ITALY","month":"MAR","SR":"Gim P","AC":"51","PR":"5","TR":200}
];
var tmpArray = [];
var obj =[];
for(var k=0; k<actual.length; k++){
var position = tmpArray.indexOf(actual[k].month);
if(position == -1){
tmpArray.push(actual[k].month);
val = {};
for(var i=0; i<actual.length; i++){
if(actual[i].month == actual[k].month){
val[actual[i].country] = actual[i]["AC"];
}
}
obj.push({month: actual[k].month, val:val});
}
}

How to extract values from an array of arrays in Javascript?

I have a variable as follows:
var dataset = {
"towns": [
["Aladağ", "Adana", [35.4,37.5], [0]],
["Ceyhan", "Adana", [35.8,37], [0]],
["Feke", "Adana", [35.9,37.8], [0]]
]
};
The variable has a lot of town data in it. How can I extract the first elements of the third ones from the data efficiently? I,e, what will ... be below?
var myArray = ...
//myArray == [35.4,35.8,35.9] for the given data
And what to do if I want to store both values in the array? That is
var myArray = ...
//myArray == [[35.4,37.5], [35.8,37], [35.9,37.8]] for the given data
I'm very new to Javascript. I hope there's a way without using for loops.

On newer browsers, you can use map, or forEach which would avoid using a for loop.
var myArray = dataset.towns.map(function(town){
return town[2];
});
// myArray == [[35.4,37.5], [35.8,37], [35.9,37.8]]
But for loops are more compatible.
var myArray = [];
for(var i = 0, len = dataset.towns.length; i < len; i++){
myArray.push(dataset.towns[i][2];
}

Impossible without loops:
var myArray = [];
for (var i = 0; i < dataset.towns.length; i++) {
myArray.push(dataset.towns[i][2][0]);
}
// at this stage myArray = [35.4, 35.8, 35.9]
And what to do if I want to store both values in the array?
Similar, you just add the entire array, not only the first element:
var myArray = [];
for (var i = 0; i < dataset.towns.length; i++) {
myArray.push(dataset.towns[i][2]);
}
// at this stage myArray = [[35.4,37.5], [35.8,37], [35.9,37.8]]

How to parse bracket tag on Javascript

I have tag like this, how the best way to get every key and value of those attribute and populate it within an array (number of attribute will be increasing)?
myData = '[data attr1="value1" attr2="value2" attr3="value3"]';
and get result array :
var arr = new Array();
arr['attr1'] = "value1";
arr['attr2'] = "value2";
arr['attr3'] = "value3";
and so on...

This probably does what you want, though it assumes that tag is already in the format you have described, i.e. a singular occurrence of [data ... ].
Also, the regular expression is purely based on what I've seen in your question; not sure whether it will break on other strings.
function decode(tag)
{
var r = /(\w+)="([^"]*)"/g,
h = {};
while ((m = r.exec(tag)) !== null) {
h[m[1]] = m[2];
}
return h;
}

Since you have string key in the data, use jquery object instead of array.
var arr = {};
var str = '[data attr1="value1" attr2="value2" attr3="value3"]';
var n = str.split('[data ');
var str_arr = n[1].replace(']','').split(" ");
jQuery.each(str_arr,function(val){
var x = str_arr[val].split('=');
arr[x[0]] = x[1].replace('"','').slice(0,-1);
});
console.log(arr);
Try this code. It may help you.
Here is the DEMO
Though it can be more optimized if you put some more details about your code.

var tagRe = /\[(\w+)((?:\s+\w+="[^"]{0,50}")*)\s*]/g;
var attrRe = /\b(\w+)="([^"]*)"/g;
function parse(text) {
var result = [];
tagRe.lastIndex = 0; // reset start position
var tagMatch = tagRe.exec(text);
while (tagMatch) {
var currentTag = { 'name': tagMatch[1], 'attrs': {} };
var attrString = tagMatch[2];
attrRe.lastIndex = 0;
var attrMatch = attrRe.exec(attrString);
while (attrMatch) {
var attrName = attrMatch[1];
var attrValue = attrMatch[2];
currentTag.attrs[attrName] = attrValue;
attrMatch = attrRe.exec(attrString); // next match
}
result.push(currentTag);
tagMatch = tagRe.exec(text);
}
return result;
}
parse('[data attr1="value1" attr2="value2" attr3="value3"]');
> [{name:'data',attrs:{attr1:'value1',attr2:'value2',attr3:'value3'}}]
This works for any number of tags in the string. The name of the tag does not matter.

Develop Reference

JavaScript is the programming language of the Web.

Issue with javascript array variables - javascript

You mean something like this: while (input.hasNext()) { var data = input.next(); var new_data = []; var i = 0; while(i<data.get('total_entries')){ new_data.push({entries: data.get('total_entries'), id: data.get('out').get(i).get('id')}); output.write(new_data[i]); i++; } }

var new_data[] = {}; First of all, that's invalid JavaScript. new_data[i] Looks like you want new_data to be an array of objects. Why not declare it as one and add objects on every iteration of the while loop: var new_data = []; while(...){ new_data.push({ entries: ... id: ... }); }

Related

unwanted keys in JSON object

SCRIPT28: Out of stack space

array object manipulation to create new object

How to extract values from an array of arrays in Javascript?

How to parse bracket tag on Javascript

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