Develop Reference

How to trigger javascript pop-up box by if-condition within the HTML code?

I created an html site where the user can input a code in a text input and then this code is being inserted in a MYSQL database if certain conditions are met. In case of a successfull database entry I would like to notify the user with a little pop up message, which displays something like "Success" and also stating some data from the table row, the code was inserted into.
I found a nice looking pop up message on the following page, which I would like to use: https://www.gitto.tech/posts/animated-modal-box-using-html-css-and-javascript/.
However, in the implementation from the page, the pop-up is triggered by the click of a button:
document.getElementById("open-popup-btn").addEventListener("click",function(){
document.getElementsByClassName("popup")[0].classList.add("active");
});
document.getElementById("dismiss-popup-btn").addEventListener("click",function(){
document.getElementsByClassName("popup")[0].classList.remove("active");
});
I would like to execute the pop-up based on an if-condition, in which I check whether an php variable is already set:
<?php
if (isset($group)) {
?> ......HTML code.....
So, can anybody tell me how to successfully remove that "onClick" function of the pop-up?
Thanks in advance!

I understand that you reload the page after said data was inserted into database?
If so, what you can do to show pop-up initially, is to simply add class active to your popup (element with class popup, like that:
<div class="popup center active">
...
</div>
BUT
in order to be able to close the popup, you still will have to attach the second part of the provided script (you can simply insert it within script tags inside php if statement (at the end of HTML body element), like:
<script>
document.getElementById("dismiss-popup-btn").addEventListener("click",function(){
document.getElementsByClassName("popup")[0].classList.remove("active");
});
</script>
note: It doesn't change the fact that, as said above - it would be better to handle this with XHR (e.g. via ajax)

Information shows in a div while pressing button from another div without loading page by jQuery & PHP

At first I apologize for not having the code of my desire & I've no idea how I'll ask the exact question by focusing any specific keywords.
However, I want to show my product information in an area(div) whenever I click a button in another area(div). & The work should be done without refreshing pages.
Again I apologize for that I've not the code. But I can provide an
image and hope you'll understand my desire
Example: Whenever I click on angry burger, the price and quantity should be shown in the right(California Fried Chicken) area. And multiple selecting product should also work one by one. After that I should be able to submit product information bu pressing submit button where a PHP operation should be done.
I want to do the whole task by jQuery & PHP
Thanks

You can achieve this by setting up click listeners in your javascript/jquery code and assign them to the ids of your pictures or fields. For example you can assign an id to an tag like below;
<p id="div">Hello world</p>
And then set up a click event in your jquery code to execute a function whenever that tag is clicked
$( "#div" ).bind( "click", function() {
var tag = $(this).html(); //get the value of the tag
alert(tag);//this will display Hello world
});
You can do this for any tag and retrieve its value or contents or anything and carry out an activity like changing the display of another element as below
$("#change").append(tag) //this will change the display of the tag with id change
Please ask if you have any questions

Store table data using localstorage and passing it to a form

Right now I am trying to use HTML5's localStorage API to grab a value from a table, and pass that value into a form.
For example, when a user clicks on "Sign Up Today" on this form: http://yft.ac/upcoming-workshops/, I want the information from the given row (Date, Time, Location), as well as the heading above it (ex: YFT Admissions Insights) to be stored, and then displayed in the field "Workshop Interested In" on this page: http://yft.ac/contact-us/.
I'm really not the best with JavaScript but here is what I have so far:
Contact Us:
$('input#workshop').text( localStorage.getItem('workshop') );
Upcoming Workshops Page:
$('body').on('click', 'a.button', function(){
var index = $(this).parents('table').index('table');
var cur_workshop = $(this).parents('.innercontent').find('h3').eq(index).text();
localStorage.setItem('workshop', cur_workshop);
});
I just tried to piece this together so the above code isn't working, but I hope that it is a good jump start for somebody that might be more well-versed in JavaScript.

You have few problems in the page.
Modernizer library is not included - you are using Modernizr.localstorage in your code
The localStorage.setItem('workshop', cur_workshop); code is added before jQuery library is added to the page - since this code used jQuery move it after inclusion of jQuery
Look like somewhere you/wordpress is calling jQuery.noConflict() - so $ does not refer jQuery anymore so use jQuery instead of $ in your code

Some quick thoughts. I believe your localStorage code should work....
But I think what might be happening is the browser is loading the contact page before you store the values in localStorage.
What you may want to do is remove the hyperlink and bind the click handler to a div, span or just a button element instead. In the click event handler use window.location = "xyz"; after you set the value to localStorage.
Again that may not be the real answer.. but try on a non hyperlink element and see. You can also do e.preventDefault; then store the value then do the window.location thing. That is sort of a progressive enhancement way to do it.
As for the localStorage I would encourage you to try to store the values in a JSON object instead of several items.
localStorage.setItem("workshop", JSON.stringify({'date' : '9/2/2012', 'time': '8:30AM', 'Princeton, NJ'}));
var workshop = JSON.parse(localStorage.getItem("workshop"));
hope this helps!

How to find/detect any textarea in page in javascript

(document.getElementById('textarea').length > 0) doesn't work. Does anyone know anything else other than this?
Will
Here is the scenario from my previous question which was unanswered. I have Rich text Editor(Openwysiwyg) which is loaded into textarea when I go to that particular page where textarea is placed. The function uses textarea id to identify textarea to replace it with Rich Text Editor(RTE). Now the script to call this function is in header part of the page. I select a drop-down option for sending email, so my textarea for email shows up. With this script added for RTE, my textarea for email is replaced by RTE and I can send formatted emails. So this works perfectly fine in Firefox. With IE7, RTE shows up even before I select drop-down option for email and this makes whole page messed up.When I select drop-down option for email, I just see normal text area and RTE still sitting at top of page.

document.getElementsByTagName('textarea').length > 0

You can use (note the plural form!)
var e = document.getElementsByTagName("textarea");
You can use jQuery as well:
$("textarea").each( function() { /* ... */ } );
EDIT:
I faced a similar problem once. I was using fckedit, and when I tried reading the value of my textedit (document.getElementById('blabla').value) I was getting null, even tough the rich text edit was ddefinetly showing something on screen.
It turns out that the fckedit API opens a new element on top of the textearea, and only when you navigate from the page is syncs it's internal data (which is on an iframe, if I am not mistaking) into the original textarea.
The moral of the story: if you are using some richtext API - use it's API to query the status of your "textarea". Hope this helps you, as I don't know the library you are using.
PS: I actually used $("blabla").val() ... which is also JavaScript... for some reason people think that jQuery is not javascript. Why is that?

Pure JavaScript (You can use this code)
textarea is HTML element tag
JavaScript :
if(document.getElementsByTagName('textarea').length > 0) {
}
HTML CODE:
<div class="flavor">
<div class="value">
<textarea name="name" rows="8" cols="80"></textarea>
</div>
</div>
<script type="text/javascript">
var flavorbox = document.getElementsByClassName('flavor')[0]
.getElementsByClassName('value')[0]
.getElementsByTagName('textarea').length;
alert(flavorbox);
</script>

Since openWYSIWYG generates a iframe on the fly, its not so simple to get/set its content.
I am currently working on changing these settings in the source. will post here a link as soon as i get the changes.

How do I send values between pages using javascript?

I am currently using a javascript code to make an entire row in my table clickable. Once the row is clicked a function is ran, I am wondering what I can use to redirect to a PHP page and preferably send a post variable along with it. My guess is AJAX but I am not sure how or if it would work.
Javascript
function DoNav(theUrl) {
document.location.href = theUrl;
};
HTML
<tr onclick="DoNav('myphpscript.php');">
I have access to jQuery so that is also an option. Any help is appreciated, Thanks!

If you need to POST the data (not use GET), One easy option is to create a form element on the fly, attach input elements with the values you need and submit it. You can do that like so if you use jQuery:
$(function() {
$('tr').click(function() {
var mail_id = /* get the mail id of this row... not sure where since I dont' have the HTML */
$('body').append('<form method="post" action="myphpscript.php" id="donavform" style="display:none;"></form>');
$('#donavform').append('<input type="hidden" name="mid" value="'+mail_id+'" />');
$('#donavform').submit();
});
});
Hope that makes sense. If not, let me know! It's, okay...
Explanation:
The very first line is a jQuery shortcut way of saying "when the document is done loading..." So, when the page is done loading, I'm going to attach an event listener to all elements in the document. When one of those elements is clicked, we can then extract the mail id (and whatever else you need) that is in relation to that particular table row. So, if you had HTML like this:
<!-- 8435 is the mail ID in this example. -->
<tr id="row3">8435</tr>
Then we could extract the mail_id variable like so:
var mail_id = $(this).html();
Now, we are going to attach a hidden form element to the end of the body of the HTML (it doesn't really matter where we put it since it is hidden... so, the end is fine). In this form element, we set the method to POST and the action to whatever php file you need to POST to. I also set an ID so it's easily referred to in the next step.
I'm now going to select the newly-created form element using its ID and I'm going to append a new hidden input element to it with the appropriate name value pair.
$('#donavform').append('<input type="hidden" name="mid" value="'+mail_id+'" />');
Finally, I'm going to use the jQuery JavaScript submit method to trigger the submit event on the form. This is basically equivalent to pressing the 'submit' button on a normal form.
Try it out, it should work flawlessly.

If you're going to a new page, just submit the form as usual. Put the data in form fields (hidden if required). No need to Ajax, jQuery or any other magic unless you want to stay on the same page and post in the background.

If the amount of data is not ridiculously large, use a query string...
<tr onclick="DoNav('myphpscript.php?key=value');">
Or if you need a natural HTTP post, you can programmatically submit the form with Javascript...
onclick="document.forms[0].submit();"

You could send the data along in a cookie. There's a nice jQuery plugin that helps with setting cookies in the jQuery namespace.
http://plugins.jquery.com/project/cookie