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How do I output a variable from JavaScript to HTML [closed]

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enter image description here
1)Make up the design below
2)License type output in Bebas font-output via font-face
3)Display the selected license type and total amount
4)The format of the link in the Buy Now button is formed at your discretion
(How to execute an item highlighted in italics)

You need to have an HTML element (like a paragraph) where you want to display the amount.
If you give the element an id attribute with the value "my-paragraph", then your script can get the element like myParagraph = document.getElementById("my-paragraph").
Then you can change the content of the element like myParagraph.textContent = myAmount.
Begin your learning journey on MDN: https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction

unable to deal with empty field in my code [closed]

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Here I need to provide officename to find the address ,but one challenge which I am facing that if user does not type anything and hit search button then I want to acknowledge them to fill the req input.
I have implemented one function also that will get invocked when someone hits the search button.But I am unable to proceed for further execution.

You can do it something like this:
var searchText = document.getElementById('<ID_OF_INPUT_FIELD>').value;
if(!searchText) {
alert('Please enter something');
}

<input id =“officeInput” name=“officeiupit” size=“35”>
Point to critical input fields and save in global variables:
oOf=document.getElementById(‘officeInput’);
When a search button has been clicked, make a copy of the textbook content inside your function which you've made:
var sInputText=oOf.value;
In this case inside your function just put
if(!sInputText)
alert(“You must enter an input.“);

How to get Element by Id from Another website [closed]

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I would like to get the content of div by its ID from another site.
Let's say, I have a site and I want to get everything that is inside of div with the id of "mainbar" from this URL - https://stackoverflow.com/questions
Could you tell me, how to make it with native javascript or jquery?
Thanks in advance.

If you have access to the other site and the Access-Control-Allow-Origin header is present, then jQuery can be used like this:
$.get('https://stackoverflow.com/questions').then(function (html) {
// Success response
var $mainbar = $(html).find('#mainbar');
document.write($mainbar.html());
}, function () {
// Error response
document.write('Access denied');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

HTML - Calling Javascript Function with variable? [closed]

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So I am trying to do a button and if you click on it then it calls a function called order(). So, If I'm trying to do something like this order("+<script>blablabla</script>+") then it shows me a error if I type into something between the "+HERE+" Why that? Is there any way around it?

You could always do something like this. Maybe change the divs around a bit and add a rounding system. This gives you a live update on the costs when selecting how many keys.
https://jsfiddle.net/8hube9ua/
Throw this under your select,
<span data-val="1.85">1.85</span> <!--How much each key is-->
then throw this into the script.
<script>
$('#suiface').change(function(){
var span = $(this).next('span');
span.text(span.data('val') * parseInt(this.value,10)) //multiplies the cost by the option selected
})
</script>

I'm not sure to understand, but why don't you write something like this ?
<button onclick="order()">Blablabla</button>

Dynamically add array textbox in a form [closed]

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I need to add in all the textbox manually in my project.
<form>
<?php for($i=0;$i<3;$i++){ ?>
<input type="text" name="product[]">
<?php } ?>
</form>
how can i solve this problem so that the number of product for insert can be flexible.
For example, user1 need to purchase 4 item, user2 wan to purchase 8 item. wihtout dynamic textbox, i need to add the textbox manually by adjusting the looping value (in my coding).

It sounds like this is an update to customer products right?
if so, you probably have products array somewhere.
so you might do :
$products = $customer->products ;//or your array
for($i=0;$i<count($products);$i++){
// your code
}
or you can add it via javascript (sounds more like it if this is the purchase moment - new products, not update)
or you might want to have somewhere a config per customer.
or Please be more specific and more descriptive