Develop Reference

disclose the alert button using javascript

In my project, I've added the alert box and try to close the box if the user clicks on disclose button. But I don't know why this if condition is not executed.
can anyone tells me where I did make a mistake?
window.onload = function(){
var button = document.querySelector(".close");
var successMessage = document.querySelector(".messageStackSuccess");
var messageStack = document.querySelector(".messageStackError");
// console.log(successMessage.className);
button.onclick = function () {
if (messageStack.className == "messageStackError") {
messageStack.classList.add("displayNone");
}
else if (successMessage.className == "messageStackSuccess") {
successMessage.classList.add("displayNone");
}
};
};

JQuery Comment system is not working

I'm trying to make comment system, the issue that the comment didn't show up , and if it did then the vote and username and other items didn't show up
The vote button is working
I don't what is the issue here?
https://codepen.io/MRuhaily/pen/OoNRQp
HTML
JQuery
$(document).ready(function() {
$('.upvote').on('click', function() {
$(this).on('click', function() {
var counter = 0;
counter = counter + 1;
$('.votes').html(counter);
});
});
$('.downvote').on('click', function() {
$(this).on('click', function() {
var counter = 0;
counter = counter - 1;
$('.votes').html(counter);
});
});
$('#addCommentButtton').on('click', function(e) {
var comment = $('#commentText').val();
$('<li>').text(comment).prependTo('.Comments');
$('#commentDiv').val('');
if (comment.length > 1) {
$('#addCommentButtton[type="submit"]').removeClass('disabled');
} else if (comment.length === 0) {
$('#addCommentButtton[type="submit"]').addClass('disabled');
}
});
});

The button type is submit so the default behaviour is to submit the form.
You have to add e.preventDefault() to the callback function:
$('#addCommentButtton').on('click',function(e){
e.preventDefault();
// rest of the code
})
That way the form will not be submitted, and the page won't be reloaded. Beside that the textarea has the id commentDiv and not commentText so it has to be:
var comment = $('#commentDiv').val();
The voting is also broken, but as you say it works like you want and your question is about the comment I won't target that problem. And it is also mentioned in the comment what you did wrong with the voting.

How to clear table inside a dialog when dialog is closed

When the button is clicked, 2 sets data is added. I use material design.
Button needs 2 clicks to run function for first time. Due to this, the data is added to table 2 times.
Code
HTML
<button onclick="purchaseList(orderid)" id="dialog">Button</button>
JS
function popup(listid) {
var starCountRef = firebase.database().ref('Orders/' +
listid).child('foodItems');
starCountRef.on('child_added', snapshot => {
var snaps = snapshot.val();
var itemPrice = snaps.price;
var itemName = snaps.productName;
var itemQuantity = snaps.quantity;
console.log(itemName);
$("#producttable").append(
'<tr><td class="mdl-data-table__cell--non-numeric">' + itemName +
'</td><td>' + itemQuantity + '</td><td>' + itemPrice + '</td></tr>'
);
});
var dialog = document.querySelector('dialog');
var showDialogButton = document.querySelector('#dialog');
if (!dialog.showModal) {
dialogPolyfill.registerDialog(dialog);
}
showDialogButton.addEventListener('click', function() {
dialog.showModal();
});
dialog.querySelector('.close').addEventListener('click', function() {
var element = document.getElementById("producttable")
while (element.lastChild) {
element.removeChild(element.lastChild);
}
dialog.close();
});
}

This should work:
var element = document.getElementById("producttable")
while (element.lastChild) {
element.removeChild(element.lastChild);
}
Add this as necessary.

I suggest you change your firebase function from using .on to .once to avoid multiple additions of data to your table and as your data isn't expected to change frequently or require active listening you better use .once for performance benefits.
firebase.database().ref('Orders/' +
listid + '/foodItems').once('value').then(function(snapshot) {
// the rest of your code goes here
});

this remocve element with class name ".mdl-data-table__cell--non-numeric"
when user click .close
dialog.querySelector('.close').addEventListener('click', function () {
dialog.close();
$(".mdl-data-table__cell--non-numeric").remove();
});
UPDATE:
to open dialog on 2nd click use pseudo element to activate like this
<div class=pseudo><button onclick="purchaseList(orderid)"id="dialog" disabled>Button</button></div>
var i=0;
$('.pseudo').click(function(){
i++;
if(i==2){
$("#dialog").prop('disabled',false);
}
});

Looking to modify href based on click and AddEventListener

I'm trying to modify a URL based on the user either (or both) clicking one of 3 text links and/or entering a keyword into a text input. Currently, I have it working, but doing both overwrites the other. For example, if I click on "Scholarships," it looks good. If I enter a word into the text input, it works but overwrites my previous selection. Please be kind, as I'm new to JS.
A CodePen:
https://codepen.io/admrbsn/pen/QOQmMN
My JS:
$(document).ready(function () {
var select = $('.custom-option');
var input = document.querySelector("#search-input");
select.click(function(e) {
var type = e.target.getAttribute('data-value');
var link = "/search/" + type + "/?searchterm=";
document.querySelector('#searchLink').href = link;
});
input.addEventListener("change", function() {
var keyword = this.value;
var link = "/search/?searchterm=" + keyword;
document.querySelector('#searchLink').href = link;
});
});

Try to reuse code, for example create a function that updates the link from both actions.
example:
function updateLink() {
var href = '';
if (link)
href = "/search/" + link + "/?searchterm=" + text;
else
href = "/search/?searchterm=" + text;
document.querySelector('#searchLink').href = href;
}
complete example:
https://codepen.io/anon/pen/ooEywW

Well yes, the change event is firing and is running the second block of code (input.addEventListener("change", function() {) that sets it without the type. I'd recommend setting variables outside of those events, and then changing the HREF with a separate code block:
$(document).ready(function () {
var select = $('.custom-option');
var input = document.querySelector("#search-input");
var type = '';
var searchterm = '';
var updateLink = function () {
var link = "/search/" + type + "?searchterm=" + searchterm;
document.querySelector('#searchLink').href = link;
}
select.click(function(e) {
type = e.target.getAttribute('data-value');
updateLink();
});
input.addEventListener("change", function() {
searchterm = this.value;
updateLink();
});
});
Also I'm not sure why you're using document.querySelector when you're already using jQuery. Why not just do $("#search-input")?

Multiple $("selectort").click (function () in if then construction not working

I have a server that dynamically(asp.net ) generate webpages that I can't alter.
On all pages I would like to capture all buttons clicked.
In JSFiddle https://jsfiddle.net/forssux/aub2t6gn/2/ is an example..
$(".checkout-basket").click (function ()
The first alert shows the 3 possible values,
but not the chosen item..
$(".button.button-dl").click(function ()
In jsfiddle this part doesn't get executed
Strangely on my real webpage I get the button clicked...but when I put it in the If then construction it fails to console.log the chosen item..
I hope somebody can explain me how to get these..
Kind Regards
Guy Forssman
//$("div.detail-info,table.checkout-basket").click(function () {
// var knopje = $(this).attr("class")//.split(" ");
// console.log(knopje + " knopje was clicked");
// if(knopje.indexOf("detail-info") > -1) {
// console.log("div class detail-info is clicked");
// }
// else if (knopje.indexOf("checkout-basket") > -1) {
// console.log("table class checkout-basket is clicked");
// }
// else {
// alert ("er is op iets anderes gedrukt");
// }
// capture click on download button in checkout-basket page
$(".checkout-basket").click (function () {
basket =[];
item="";
str = $(this).text();
str = str.replace(/\s\s+/g, ' ');
var str = str.match(/("[^"]+"|[^"\s]+)/g);
console.log("Array ",str);
for(var i=0;i<str.length;i++){
if(str[i] === "verwijder"){
console.log("Item= ",str[i+1]);
item = str[i+1];
basket.push(item);}
}
console.log("Basket contains ",basket);
//console.log("idValBasket ",idVal);
var test = idVal.replace(/\$/gi, "_").slice(0,-6);
console.log("test ",test);
var element = test.substr(test.length - 2)-1;
console.log("element ",element);
element=element-1;
item = basket[element];
console.log("Item finaal is ",item);
});
$(".button.button-dl").click(function () {
var addressValue = $(this).attr('href');
console.log("addresValue Basket",addressValue );
var re = /'(.*?)'/;
var m = addressValue.match(re);
console.log (" m basket is ",m);
if (m != null)
idVal = (m[0].replace(re, '$1'));
console.log("idVal Basket",idVal);
});
//This section captures the download in the detail page
$(".button").click(function () {
var downloadItem = document.getElementsByTagName("h1")[0].innerHTML
console.log("addresValue detail",downloadItem );
});

I never use click function, use on(*event*,...) instead:
$(".checkout-basket").on("click", function (){ /* CODE */ });
Check if visually there are a layout over the a layuot (a div, span, etc.)

Maybe a strange question and maybe i got it wrong, but why do you use push ?? if you want to delete an item ? btw also the example isn't working so maybe that is your problem