related (sort of) to this question. I have written a script that will loop through an object to search for a certain string in the referring URL. The object is as follows:
var searchProviders = {
"google": "google.com",
"bing": "bing.com",
"msn": "search.msn",
"yahoo": "yahoo.co",
"mywebsearch": "mywebsearch.com",
"aol": "search.aol.co",
"baidu": "baidu.co",
"yandex": "yandex.com"
};
The for..in loop I have used to loop through this is:
for (var mc_u20 in mc_searchProviders && mc_socialNetworks) {
if(!mc_searchProviders.hasOwnProperty(mc_u20)) {continue;}
var mc_URL = mc_searchProviders[mc_u20];
if (mc_refURL.search(mc_URL) != -1) {
mc_trackerReport(mc_u20);
return false;
}
Now I have another object let's call it socialNetworks which has the following construct:
var socialNetworks = {"facebook" : "facebook.co" }
My question is, can I loop through both of these objects using just one function? the reason I ask is the variable mc_u20 you can see is passed back to the mc_trackerReport function and what I need is for the mc_u20 to either pass back a value from the searchProviders object or from the socialNetworks object. Is there a way that I can do this?
EDIT: Apologies as this wasn't explained properly. What I am trying to do is, search the referring URL for a string contained within either of the 2 objects. So for example I'm doing something like:
var mc_refURL = document.referrer +'';
And then searching mc_refURL for one of the keys in the object, e.g. "google.com", "bing.com" etc. 9this currently works (for just one object). The resulting key is then passed to another function. What I need to do is search through the second object too and return that value. Am I just overcomplicating things?
If I understand your question correctly, you have a variable mc_refURL which contains some URL. You want to search through both searchProviders and socialNetworks to see if that URL exists as a value in either object, and if it does you want to call the mc_trackerReport() function with the property name that goes with that URL.
E.g., for mc_refURL === "yahoo.co" you want to call mc_trackerReport("yahoo"), and for mc_ref_URL === "facebook.co" you want to call mc_trackerReport("facebook").
You don't say what to do if the same URL appears in both objects, so I'll assume you want to use whichever is found first.
I wouldn't create a single merged object with all the properties, because that would lose information if the same property name appeared in both original objects with a different URL in each object such as in an example like a searchProvider item "google" : "google.co" and a socialNetworks item "google" : "plus.google.com".
Instead I'd suggest making an array that contains both objects. Loop through that array and at each iteration run your original loop. Something like this:
var urlLists = [
mc_searchProviders,
mc_socialNetworks
],
i,
mc_u20;
for (i = 0; i < urlLists.length; i++) {
for (mc_u20 in urlLists[i]) {
if(!urlLists[i].hasOwnProperty(mc_u20))
continue;
if (mc_refURL.search(urlLists[i][mc_u20]) != -1) {
mc_trackerReport(mc_u20);
return false;
}
}
}
The array of objects approach is efficient, with no copying properties around or anything, and also if you later add another list of URLs, say programmingForums or something you simply add that to the end of the array.
You could combine the two objects into one before your loop. There's several approaches here:
How can I merge properties of two JavaScript objects dynamically?
var everything = searchProviders;
for (var attrname in socialNetworks) { everything[attrname] = socialNetworks[attrname]; }
for(var mc_u20 in everything) {
// ...
}
for (var i = 0; i < mc_searchProviders.length; i++) {
var searchProvider = mc_searchProviders[i];
var socialNetwork = mc_socialNetworks[i];
if (socialNetwork != undefined) {
// Code.
}
}
Or am i horribly misunderstanding something?
Related
I have a list of routers in array called routerList. I want to display the active router next to the backup router in my view. The router object in the array has an attribute called HostName that has the locationID_Router#_RouterName, for instance WA34_R01_ABCABC. Somewhere in the array is another router that is its pair with the name WA34_R02_ABCABC. I want to reorder the array so when I use ng-repeat those two routers and all the other matched pairs will be next to each other. I wrote a function that will tell me if the names are the same minus 1 character so R01 and R02. Here:
function stringCompare(word1, word2){
var differences = 0;
if(word1 != word2){
if(word1.length == word2.length){
for(i=0; i <= word1.length-1; i++){
if(word1.charAt(i) != word2.charAt(i)){
differences +=1;
}
}
}
}
if(differences == 1){
return true;
}else{
return false;
};
};
I then tried to have a loop within a loop to get the pairs and add them to a new array as it found the pairs but I keep getting errors of cannot read HostName part way through the loop.
function findCouples(array){
var MatchedRouters = [];
for(i=0;i<=array.length-1;i++){
for(var i2=0;i2<=array.length-1;i2++){
if(stringCompare(array[i].HostName,array[i2].HostName)){
MatchedRouters.push(array[i]);
MatchedRouters.push(array[i2]);
}
}
}
return MatchedRouters
};
If there is a better way to do this PLEASE let me know! If not any help you could give me for getting it to work like this would be amazing.
Thanks!!
When you initally get your list or routers create the properties you need to sort on.
Something like:
routers.forEach(function(router) {
router.location: getRouterLocation(router.HostName);
router.number: getRouterNumber(router.HostName);
router.name: getRouterName(router.HostName);
});
Then create your functions getRouterLocation, getRouterNumber, etc.. to parse out the values you need.
function getRouterLocation(hostName) {
return hostName.substring(0, hostName.indexOf('_');
}
I'm pushing an object into an array of objects. One of the properties of the object (which is an array) is showing up as undefined, after the object is pushed to the array. If you look at my code below, where it says, "WHY IS THIS SHOWING IN CONSOLE?" - it doesn't make sense because if the array is undefined, it should have been undefined in both of the previous two checks (where it says "THIS IS NOT SHOWING IN CONSOLE."). This is driving me crazy. SOS. Please help.
var pathCopy = unit.path; // THIS IS AN ARRAY AND IT IS NOT EMPY
var directionCopy = unit.direction;
if (pathCopy.length < 1) {
console.log('THIS IS NOT SHOWING IN CONSOLE');
}
var object = {
'type': 'move',
'time': gameTime,
'name': unit.name,
'vector': pathCopy,
'direction': directionCopy
};
currentGameEvents.push(object);
if (object.vector.length < 1) {
console.log('THIS IS NOT SHOWING IN CONSOLE');
}
for (var i = 0; i < currentGameEvents.length; i++) {
if (currentGameEvents[i].vector.length < 1) {
console.log('WHY IS THIS SHOWING IN CONSOLE??');
}
}
I’m not sure how or why, but your example works, if I insert the undefined variables (i.e. I replaced unit.path with [345,34623,52] or something that is an array literal).
The only difference to that is, that you actually assign the reference to that array, instead of declaring a new array.
var pathCopy = unit.path; // pathCopy and unit.path are the SAME array
var pathCopy = [345,346,345]; // pathCopy is a completely NEW array
To fix this, try something like
var pathCopy = unit.path.slice(); // pathCopy is a completely NEW array that contains the same values as unit.path
whenever you want to copy an array; add .slice() at the end!
Again, this is deducing from the only difference between your code and what I tried, and this is probably the reason, why your code doesn’t work.
Another assumption is that currentGameEvents is an Array. Your code wouldn’t work at all, otherwise. I’m mentioning this because the title states that you were trying to push to an object, which isn’t possible.
i am trying for the first time to implement OOP in javascript and i got stuck on a recursive function when i try to send an array of objects to this function. So, i have the "Pitic" class (pitic means midget in romanian) with some propreties:
function Pitic(piticID) {
this.id = piticID;
this.inaltime = null;
this.greutate = null;
this.genereazaGreutate();
this.genereazaInaltime();
}
I'm now generating some midgets and storing them in the public piticiCollection Array variable. The "genereazaGreutate" and "genereazaInaltime" are function to generate random values for the inaltime and greutate values.
var pitic = new Pitic(idPitic);
piticiCollection.push(pitic);
The problem appears when i try to send the array of midgets to a function because all i get is only the first item of the array.
So, before i call the function, i have piticiCollection array with 4 objects:
midgets are safe and sound http://img443.imageshack.us/img443/484/yr4f.png
And as soon as i call the function with the piticiCollection as a parameter i loose 3 midgets! :(
most of the midgets are gone http://img201.imageshack.us/img201/5808/7od5.png
p.s. please excuse me for my bad english..
[EDIT]
Here is a fiddle of my full code: http://jsfiddle.net/WT7Ud/ I call the function on line 56 and as soon as the debugger hits line 60 i loose array items.
I have solved my problem by creating a copy of the array before using it in the function. Strange :(
function determinaPerechi(somePitici) {
var piticDeComparat, colectieDePiticiCopy;
colectieDePiticiCopy = somePitici;
for (var i = 1; i < colectieDePiticiCopy.length; i++) {
var piticDeComparat2 = null;
piticDeComparat = colectieDePiticiCopy[0];
piticDeComparat2 = colectieDePiticiCopy[i];
if (piticDeComparat.inaltime < piticDeComparat2.inaltime) {
//Perechea poate fi prietena
}
}
//colectieDePiticiCopy.splice(0, 1);
if (colectieDePiticiCopy.length == 0) {
//alert("finish");
return;
}
determinaPerechi(colectieDePiticiCopy);
//test(ttt);
}
Your determinaPerechiPosibile is modifying the original array on this line:
colectieDePitici.splice(1, colectieDePitici.length);
In particular, it is removing all but the first element. You probably should be using slice to non-destructively extract the part of the array you want to recurse on.
As Ted Hopp mentioned, the problem appears to be the line
colectieDePitici.splice(1, colectieDePitici.length);
in combination with this line:
determinaPerechiPosibile(colectieDePiticiCopy);
If those two lines are commented out, the array maintains its original length.
This is probably easy for someone.
I am returning a list of campaignIDs (12,45,66) via JSON to a javascript variable
var campaignList = res.DATA.CAMPAIGNS
Now, given a specified campaignID passed in the URL
var campaignId ='<cfoutput>#url.campaignID#</cfoutput>'
I want to check if the returned list contains this campaignID
Any help much appreciated.
Plenty of ways to do it, but I like nice data structures, so ...
Split the list on comma, then loop over list, looking for value:
function campaignExists(campaignList,campaignId) {
aCampaignList = campaignList.split(',');
for (i=0;i<aCampaignList.length;i++) {
if (aCampaignList[i]==campaignId)
return true;
}
return false;
}
Since Array.indexOf sadly isn't cross browser, you're looking at something like:
// assume there is no match
var match_found = false;
// iterate over the campaign list looking for a match,
// set "match_found" to true if we find one
for (var i = 0; i < campaignList.length; i += 1) {
if (parseInt(campaignList[i]) === parseInt(campaignId)) {
match_found = true;
break;
}
}
If you need to do this repeatedly, wrap it in a function
Here's a bit of a "out of the box" solution. You could create a struct for your property id's that you pass into the json searilizer have the key and the value the same. Then you can test the struct for hasOwnProperty. For example:
var campaignIDs = {12 : 12, 45 : 45, 66 : 66};
campaignIDs.hasOwnProperty("12"); //true
campaignIDs.hasOwnProperty("32"); //false
This way if the list is pretty long you wont have to loop through all of the potential properties to find a match. Here's a fiddle to see it in action:
http://jsfiddle.net/bittersweetryan/NeLfk/
I don't like Billy's answer to this, variables within the function have been declared in the global scope and it is somewhat over complicated. If you have a list of ids as a string in your js just search for the id you have from user input.
var patt = new RegExp("(^|,)" + campaignId + "(,|$)");
var foundCampaign = campaignList.search(patt) != -1;
Say I have an array in JS: var fruits = [apple,orange,banana]
I want to store the index of each fruit in variables such that at any point in time, if I add more stuff to the array, I will still know that the index of apple is X. So in this case, 0 is apple, but if I add something to the beginning of that away, the index of apple changes.
The more verbose way I can think of is to loop through the array
for (var i=0;i<fruits.length;i++) {
switch(fruits[i]) {
case:"apple"
var indexApple = i;
break;
//etc
}
}
Another way I can think of is use the value of the arrays as the variable name.
for (var i=0;i<fruits.length;i++) {
//psedo code
var 'index' + fruits[i] = i;
}
So in the end I'd have var indexApple = 0, indexOrange = 1, etc. THe key to the second method is to be able to create a dynamic variable by concatenating the string 'index' and the value of the array to create that variable. Not sure how to do that.
Note: Ideally I want the variables that store the index to be dynamically generated. Such that I only I can modify/add to the fruits array, and a new variable will be generated to store the index.
it seems like ensuring your the value of the index is legitimate will be difficult. i would include jquery and use the inArray method which returns the index of the item in the array.
function showIndexes() {
var appleIndex = $.inArray(fruits, "Apple"); //returns 0
var guavaIndex = $.inArray(fruits, "Guava"); //returns -1
fruits.unshift("Guava");
appleIndex = $.inArray(fruits, "Apple"); //returns 1
guavaIndex = $.inArray(fruits, "Guava"); //returns 0
}
The simplest solution is simply to build an Object which gives you nearly O(1) lookup time, and will scale with your array:
function LinkFruits(fruits) {
FruitLookup = {}
fruits.forEach((fruit,ind) => FruitLookup[fruit] = ind)
}
Now you can simply "lookup" your index from the FruitLookup table when needed like:
console.log("The index of apple is",FruitLookup.apple,"and for orange is",FruitLookup.orange)
Now if you modify your array you simply need to run LinkFruits(fruits).
Technical Note: If you want to fully automate this process you can look into Array.observe() which is now deprecated. Or overload the push and pop methods of this array to trigger the update before falling back to the default prototype methods.