Develop Reference

input box asking for two specific words

I'm new to this, so I hope I can explain well enough what my problem is.
I've got a quiz and for an answer I created an input box. To get to another link you have to put two words in there but the order should not matter aka. it shouldn't matter if you write down "word1 word2" or "word2 word1", there should be only one rule: both words should be mentioned.
Is that possible?
My code so far:
function checkText()
{
var textwunf_1 = document.getElementById("wunf").value;
if(textwunf_1.toLowerCase() == "word1" && "word2"){
window.open("URL","_self");
}
else{
xxx
}
}
It does not work.
Before I only wanted to check if one word is used, like that:
var textwunf_2 = 'word1';
function checkText()
{
var textwunf_1 = document.getElementById("wunf").value;
if(textwunf_1.toLowerCase().indexOf(textwunf_2) == -1){
xxx
}
else{
window.open("URL","_self");
}
}
This worked but I can't use it for two words, because if I write
var textwunf_2 = 'word1 word2';
the order can't be 'word2 word1'...
Is there a solution to my problem?
Hopefully anyone can understand and help me, thank you!

Based on this commentary from the OP:
if the user types 3 words and two of them match with the answer, it should be also okay! even better if even 3 words or more are possible, as long as the user puts my two words in it..
You can check if both words are whitin the text using two conditions on the if:
textwunf_1.toLowerCase().indexOf("word1") >= 0
AND
textwunf_1.toLowerCase().indexOf("word2") >= 0
Try with the next code:
var textwunf_2 = 'word1';
var textwunf_3 = 'word2';
function checkText()
{
var textwunf_1 = document.getElementById("wunf").value;
if ((textwunf_1.toLowerCase().indexOf(textwunf_2) >= 0) &&
(textwunf_1.toLowerCase().indexOf(textwunf_3) >= 0))
{
window.open("URL","_self");
}
else
{
// xxx
}
}

Another approach:
var words = ["word1", "word2"];
function CheckWords() {
var inputWords = document.getElementById("wunf").value.split(' ');
var allWordsFound = true;
if (inputWords.length !== words.length) { return false; }
inputWords.forEach(function(word) {
if (words.indexOf(word.toLowerCase()) === -1) {
allWordsFound = false;
return;
}
});
return allWordsFound;
}
console.log(CheckWords());

I am creating a function that receive the text and check if include the answers(xx and yy), it doesn't matter the order. The ans list, can have 1,2 or more words, it will work.
let ans = ['xx','yy'];
function check(text){
text = text.toLowerCase();
let counter = 0;
ans.forEach((x) => {text.includes(x) && counter++ })
return counter === ans.length
}
console.log(check("aa bb")) // false
console.log(check("xx bb")) // false
console.log(check("aa yy")) // false
console.log(check("xx yy")) // true
console.log(check("yy xx")) // true

Trouble showing alert after iterating through an array

I have an input field where the user inputs their zip code which I then attempt to match to a zip code within an array. While the following works, I need it to actually show an alert dialog once saying that zip code wasn't found, however, it current pops up a lot even if the zip code is in the list.
Here's my snippet:
_zipcodeBtn.onclick = function(){
var userZip = _zipcode.value;
for (var i = 0; i < zipcode_list.length; i++) {
if (zipcode_list[i] === userZip) {
console.log('works');
break;
} else {
alert("repeating");
}
}
};
I want it to check if their zip is available without it also repeating the else statement multiple times. Whats the best way to prevent this?

There's an easier way to find an item in an array, by referencing the array's indexOf() method (docs).
if (zipcode_list.indexOf(userZip) != -1) {
//found - do something
} else
alert('Zip not found!');
As Angel Politis shows, you can also use includes() if you literally just want to know whether an item is in an array, not its actual position within it.
Sidenote: it's important to check against -1 when using indexOf() because it returns the index at which the search is found - or -1 if it's not. If the search is found at the first key, this is 0, and 0 is a falsy value, which can catch people out sometimes when they do things like this:
var arr = [1, 2, 3];
if (arr.indexOf(1))
alert('success');
else
alert('failed');
You'd think the success alert would fire here, but actually it'll be the failure alert, because indexOf() in this case returns 0, and 0 is a falsy value when it's interrogated in a condition.

There's no need to use a loop here. You can just say:
if (!zipcode_list.includes(userZip)) alert("Doesn't work!");
If you must use a loop, then just set a flag by default to false and then, if the zip is found set it to true. Then you can check it outside the loop:
/* Create a flag and set it by default to false. */
var found = false;
/* Loop */
for (var i = 0, l = zipcode_list.length; i < l; i++) {
if (zipcode_list[i] === userZip) {
/* Set the flag to true and stop the loop. */
found = true;
break;
}
}
/* Check whether the zip was found in the array. */
if (found) console.log("Works!");
else alert("Doesn't work!");

JS: Using Length Property to Write If Statement

I'm very new to JS so go easy on me. I've got this array inside a variable, and am trying to find a better way to write that if statement. So if the names inside that variable grow, I won't need to change the if statement as it won't be hardcoded.
var names = ["beth", "barry", "debbie", "peter"]
if (names[0] && names [1] && names [2] && names [3] {
Do something...
}
Something tells me I need to be using the .length property but I can't work out how to properly use it within that statement. Something along the lines of:
if (names[i] * names.length) {
Do something...
}
I know that's wrong. I think need to be finding the index of each and looping through it makign sure it the loop doesn't exceed the amount of values in the array.
Any help is appreciated. Thanks in advance!
Update: Some users have alerted me that my question might not be as clear. I've setup a CodePen here (http://codepen.io/realph/pen/KjCLd?editors=101) that might explain what I'm trying to achieve.
P.S. How do I stop my from repeating 3 times?

You can use every to test whether every element satisfies some condition:
if (names.every(function (name) { return name })) {
// Do Something
}
every will automatically stop testing when the first non-true element is found, which is potentially a large optimization depending on the size of your array.
Traditionally, you would simply iterate over the array and test each element. You can do so with forEach or a simple for loop. You can perform the same early-termination when you find a non-true element by returning false from the forEach callback.
var allTrue = true;
names.forEach(function (name) {
return allTrue = allTrue && name;
});
if (allTrue) {
// Do something...
}

Please give a english description of what you are trying to accomplish. The below answer assumes you simply want to iterate a list of names and do some processing with each.
You want to use a for loop.
var names = ["beth", "barry", "debbie", "peter"]
for (var i=0; i<names.length; i++) {
// access names[i]
}

The best cross-browser solution is to use a traditional for loop.
var names = ["beth", "barry", "debbie", "peter"],
isValid = true,
i;
for (i = 0; i < names.length; i++) {
isValid = isValid && names[i];
}
if (isValid) {
// do something
}

You can try this;
var checkCondition = true;
for(var i = 0; i<names.length; i++){
if(names[i] !== something) {
checkCondition = false;
break;
}
}
if(checkCondition){
//Do what ever you like if the condition holds
}else{
// Do whatever you like if the condition does NOT holds
}

If i understand right you need something like this
var names = ["beth", "barry", "debbie", "peter"];
var notUndefinedNames = names.filter(function(el){return el !== undefined;});
// if all
if (names.length === notUndefinedNames.length) console.log("You're all here. Great! Sit down and let's begin the class.");
// if one or less
else if (notUndefinedNames.length <= 1) console.log("I can't teach just one person. Class is cancelled.");
else console.log("Welcome " + notUndefinedNames.join(', '));

How to detect if a user input has been repeated?

I'm trying to make hangman in javascript and I want to check if the user has used a letter already. I made a var letterGuessValue = to 0 and if they add an input it = 1. I know this would say know to everything if i got it to work (it doesn't even do anything) but am I on the right track maybe? Here's my code. http://jsbin.com/aWOnAfe/5/edit

I would say add an input to a list and whenever they add another input (aka letter), check this list to see if it is already in there. If it is, then its because they've already used that letter before. If not, then it is a new letter.

I don't see where the difficult part is.
http://jsfiddle.net/DerekL/jgqQ9/
Sample code
var used = {};
$("input").keyup(function(){
var val = this.value;
alert( used[val] ? "Used" : "Not used" );
this.value = "";
used[val] = true;
});
How it works
Assign true to used.LETTER when a letter is entered. Before assigning it though, if it was undefined then it hasn't been used. If it is true then it is used.
Sometimes developers tend to use an Array to record pressed keystrokes when doing key combinations, but in this case, iterating an Array would require both more memory and computation power. A simple object is an enough fit.

Use an array to store all of the used letters and function like this to add new ones.
var inputs = []
function addLetter(letter){
var used = false;
for(var i = 0; i < inputs.length; i++){
if(inputs[i] == letter){
used = true;
break;
}
}
if(!used){
inputs.push(letter);
}
}

The easiest way is to append each letter to a string, like this:
var letters = '';
var letterPressed = 'X'; // uppercase it if appropriate for your language
if (letters.indexOf(letterPressed) > -1)
{
// you already pressed it
}
else
{
letters += letterPressed;
}
You can also use an array to store your list of presses, although IMO that's overkill.

validate 2 dropdowns (only some combinations valid)

I am completely new to JavaScript.
I have size and color dropdowns on a page for users to order a product, but only certain combinations are available i.e. pink is the only color in large sizes.
I thought I'd make an array of allowed sizes and test the user input against these.
If the choice is invalid then I want a popup to tell the user why.
In the real world I'll use SQL & PHP to create the array of allowed choices, in the example below I've hard coded 3 valid choices for testing. Unfortunately the code below doesn't do anything.
I'm sure it's a simple newb mistake. I really don't know what I'm doing :)
Can somebody help me out?
The validation function is supposed to happen when user clicks the form submit...
<form id="form1" name="form1" method="post" onsubmit="return validate_form()"
action="cart.php">
Here's the function:
<script type="text/javascript">
function validate_form() {
var allowed = new Array();
allowed[0]="10,beige";
allowed[1]="10,black";
allowed[2]="10,pink";
var chosenColInd = document.getElementById("colID");
var chosenColText = colID.options[colID.selectedIndex].text;
var chosenSizeInd = document.getElementById("sizeID");
var chosenSizeText = sizeID.options[sizeID.selectedIndex].text;
var chosenSizeCol = chosenSizeText+","+chosenColText;
var found = "false";
for ( var i = 0; i < allowed.length; i++ ) {
if (allowed[i]=chosenSizeCol) {
found = "true";
}
}
if (found = "false") {
alert( 'The variation you have selected is currently unavailable. Please select another.' );
return false;
} else {
return true;
}
}
</script>

There are a few lines where you use the assignment operator (that is single equals =) instead of one of the equality operators (that is double or triple equals, triple is usually preferred in JavaScript). Example:
if (found = "false") {
Would appear to be the problem at first sight - it's an assignment not a comparison :) use triple equals === instead of single:
if(found === "false") {
Also, consider the following (commented) updates to your code, which reflects more the typical style of JavaScript code:
function validate_form() {
//no need to use new Array(), use array literal instead
var allowed = [
"10,beige",
"10,black",
"10,pink"
];
var chosenColInd = document.getElementById("colID");
var chosenColText = colID.options[colID.selectedIndex].text;
var chosenSizeInd = document.getElementById("sizeID");
var chosenSizeText = sizeID.options[sizeID.selectedIndex].text;
var chosenSizeCol = chosenColText+","+chosenSizeText;
var found = "false";
for ( var i = 0; i < allowed.length; i++ ) {
//use equality operator instead of assignment
if (allowed[i]===chosenSizeCol) {
found = true; //may as well use a boolean rather than string
break; //exit loop early, no need to continue if we've already found
}
}
if (!found) { //no need to do a comparison with already boolean values
alert( 'The variation you have selected is currently unavailable. Please select another.' );
}
//may as well just return found here now that we're using a boolean
return found;
}