Develop Reference

Function variables don't work in jQuery?

Im making a jquery function, but im getting trouble with some variables. I cant get the value of #op1 to the input and in #z1 it shows "i" instead of "Start. Also the counter parameter doesnt add up. It only shows "0". In the click event it gets added up.
javascript code:
$(function() {
$(function () {
var inpreco = [];
var altpreco = [];
var cpcounter9 = 0;
$(".opcaopreco").click(function () {
SuperF(this, "#preco", "inpreco", "altpreco", "cpvalor", "cpindex",
"cpactive", "cpcounter9", "preco");
});
function SuperF(element, input, inpArray, secArray, inpValue, secIndex,
inpActive,
counter, msqlip) {
var inpValue = $("#" + element.id).val();
var secIndex = $("#" + element.id).data(secIndex);
var inpActive = $("#" + element.id).data(inpActive);
if (inpArray[0] == "") {
counter++;
$("#" + element.id + "l").addClass("activa");
$(element).data(inpActive, "primary");
inpArray[0] = (inpValue);
input.val(inpArray[0]);
}
$("#z1").html(inpArray[0]);
$("#z2").html(counter);
$("#z3").html(cpcounter9);
};
});
});
html code:
<input id="preco" type="text" name="preco" value=''><br><br>
<div id="op1l" class="input">
<input type="checkbox" id="op1" class="opcaopreco" value="Start" data-cpindex="1" data-cpactivo="">
<label for="op1"></label>
<span class="itext">Test</span>
</div>
<ul id="z">
<li id="z1">z1</li>
<li id="z2">z2</li>
<li id="z3">z3</li>
</ul>

You're passing in strings for your parameters, not elements. So when you index that parameter you're getting the first character in the string.
You need to use the strings as selectors to get their associated elements and then pass their return values into your function:
// use the strings to make a selection
var preco = $('#preco');
var inpreco = $('inpreco');
// etc.
// pass the results of each selection into your function
SuperF(this, preco, inpreco, ...)
You can do this inline as well:
SuperF(this, $("#preco"), $("inpreco"), ...)
Similarly, you have other variables you're trying to pass as strings, rather than passing them by name like this:
SuperF(this, $('#preco'), inpreco, altpreco, cpvalor, cpindex, cpactive, cpcounter9, preco);
That is the reason your function can't access most of the parameters and why your counter remains at 0.

How to get element by name with $key

PHP
//Here is my html for qty
<p>Qty : <input type="number" value="" name="qty<?php echo $key ?> onChange="findTotal()"/>
JS function
function findTotal() {
var arr = document.getElementsByName('qty');
...
document.getElementById('result').value = decimalPlaces(tot, 2);
}
My qty name needs key for post array. How do I get name inside js function to calculate quantities?

You can use
document.querySelector("input['name^='qty']").value
if you don't have jQuery.
This will select an input with name attribute starting with "qty". If you have multiple inputs which match the criteria you can select them all using
document.querySelectorAll("input[name^='qty']")
which will return a NodeList. You can read more about this here.

You can do something like this
var myVar = document.getElementsByTagName("somename");
//do something else
If you are using jquery
value = $( "input[name^='qtd']" ).val();
//it will pick the input wich name starts with 'qtd'

In pure DOM, you could use getElementsByTagName to grab all input elements, and loop through the resulting array. Elements with name starting with 'qty' get pushed to another array:
var eles = [];
var inputs = document.getElementsByTagName("input");
for(var i = 0; i < inputs.length; i++) {
if(inputs[i].name.indexOf('qty') == 0) {
eles.push(inputs[i]);
}
}

Don't query the element by the name attribute's value. I'm not sure what's the purpose of the key and why you need it in the findTotal method, but here's an example:
<p>Qty : <input type="number" value="" name="qtyMyKey" onChange="findTotal(event)" /></p>
<script>
function findTotal(e) {
var inputEl = e.target,
inputName = inputEl.getAttribute('name'),
myKey;
if (typeof inputName === 'string') {
myKey = inputName.replace('qty', '');
}
console.log(myKey);
//var arr = document.getElementsByName('qty');
//document.getElementById('result').value = decimalPlaces(inputEl.value(), 2);
}
</script>
Here's the jsFiddle demo.

Get data sent from form in popup

I need to Get data sent from form in popup but the problem that in the form there is many checkboxes with same name like name='list[]' :
JS :
function showPopup(){
var user = document.getElementById("check").value;
var popup = window.open("milestone.php?a="+user,"hhhhhh","width=440,height=300,top=100,left=‌​300,location=1,status=1,scrollbars=1,resizable=1") ;
}
html :
<input type='checkbox' name="approve[]" value="get from Mysql">
<input type='checkbox' name="approve[]" value="get from Mysql">
<input type='checkbox' name="approve[]" value="get from Mysql">

var user = document.getElementById("check").value;
That won't work because:
You need to get multiple values
You need to get the values only of checkboxes that have been checked
You don't have an element with that id (but an id has to be unique anyway)
The fields all have the same name. Use the name.
var inputs = document.getElementsByName("approve[]")
Then you need to generate your form data from it, filtering out the ones which are not checked:
var form_data = [];
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if (input.checked) {
form_data.push(encodeURIComponent(input.name) + "=" + encodeURIComponent(input.value));
}
}
Then put all the form data together:
var form_data_query_string = form_data.join("&");
Then put it in your URL:
var url = "milestone.php" + "?" + form_data_query_string;
Then open the new window:
var popup = window.open(url,"hhhhhh","width=440,height=300,top=100,left=‌​300,location=1,status=1,scrollbars=1,resizable=1") ;

If you want to pass the array via get you should loop through all the checked checkboxes and store the value of everyone in array then convert them to Json using JSON.stringify so you can passe them in url :
function showPopup(){
var approve_array=[];
var checked_checkboxes = document.querySelectorAll('input[type="checkbox"]:checked');
for(var i=0;i<all_checkboxes.length;i++){
approve_array[i] = checked_checkboxes[i].value;
}
var url = "milestone.php?approve="+JSON.stringify(approve_array);
var popup = window.open(url,"hhhhhh","width=440,height=300,top=100,left=‌​300,location=1,status=1,scrollbars=1,resizable=1") ;
}
In you php page you could get the array passed as Json using json_decode :
$array_of_approves = json_decode($_GET['approve']);
Hope this helps.

You can access the value as:
$approveList= $_POST['approve'];
and can be iterated as
foreach ($approveList as $approve){
echo $approve."<br />";
}

Getting values from list<String> , split them and then slice them by parts, using JavaScript

I have List<String> from Spring MVC which i want to split, slice and print on browser. The problem is that i need to enter a start and end argument of slice() method as a variable from text-field. This is my code, but it doesn't work. Can someone helps me with that? This is my code:
<body>
<form>First value:
<br/>
<input type="text" id="firstvalue" />Last value:
<br/>
<input type="text" id="lastvalue" />
<button onclick="myFunction()">Press</button>
<p id="demos"></p>
</form>
<script>
function myFunction() {
var str = "${first}";
var arr = str.split(",");
var first = document.getElementById('firstvalue');
var second = document.getElementById('lastvalue');
document.getElementById("demos").innerHTML = arr.slice('first', 'second');
}
</script>
</body>
Thank you in advance!

you got some issues in your code.
if ${first} is List<String>, then you need to convert it to a concatenated single comma separated String. Because by ${first} you are just printing list object.
slice expects index which is number, you are passing String
You are not doing .value after document.getElementById
You are not passing the user input variables first and second to slice, Instead you are passing hardcoded strings 'first' and 'second'.
Below is the fixed code
HTML
<form>First value:
<br/>
<input type="text" id="firstvalue" />Last value:
<br/>
<input type="text" id="lastvalue" />
<button onclick="myFunction(event)">Press</button>
<p id="demos"></p>
</form>
JS
var myFunction = function (e) {
var str = "${first}" // assuming this contains string like "1,2,3,4,5,6,7,8,9,10"; and not the List obect
var arr = str.split(",");
var first = document.getElementById('firstvalue').value;
var second = document.getElementById('lastvalue').value;
document.getElementById("demos").innerHTML = arr.slice(parseInt(first, 10), parseInt(second, 10)).toString();
e.preventDefault();
};

What do we want to achieve?
We have two input textfields: one holding a start value and one holding an end value. On a click we want to create a range from the start to the end value and output it into a container.
Solution
The solution is more simple than expected and we do not require split, slice and part. Also we do not really require a predefined list holding all values.
Example
<html>
<head>
<script>
function evalRange(){
var tS = parseInt(document.querySelector('#inFrom').value); //Our start value;
var tE = parseInt(document.querySelector('#inTo').value); //Our end value;
var tR = document.querySelector('#demos'); //Our output div
if (tE >= tS){
//We are using the Array.apply prototype to create a range
var tL = Array.apply(null, Array(tE - tS + 1)).map(function (a, i){return tS + i});
//We output the range into the demos div
tR.innerHTML = tL.join(',')
}
else tR.innerHTML = 'To has to be higher than from';
//Returning the range list
return tL
}
</script>
</head>
<body>
<input type = 'text' id = 'inFrom' value = '10' />
<input type = 'text' id = 'inTo' value = '20' />
<b onclick = 'evalRange()'>Range</b>
<div id = 'demos'></div>
</body>
</html>
And here is a fiddle for it: https://jsfiddle.net/91v3jg66/

storing user input in array

I need to do the following (I'm a beginner in programming so please excuse me for my ignorance): I have to ask the user for three different pieces of information on three different text boxes on a form. Then the user has a button called "enter"and when he clicks on it the texts he entered on the three fields should be stored on three different arrays, at this stage I also want to see the user's input to check data is actually being stored in the array. I have beem trying unsuccessfully to get the application to store or show the data on just one of the arrays. I have 2 files: film.html and functions.js. Here's the code. Any help will be greatly appreciated!
<html>
<head>
<title>Film info</title>
<script src="jQuery.js" type="text/javascript"></script>
<script src="functions.js" type="text/javascript"></script>
</head>
<body>
<div id="form">
<h1><b>Please enter data</b></h1>
<hr size="3"/>
<br>
<label for="title">Title</label> <input id="title" type="text" >
<br>
<label for="name">Actor</label><input id="name" type="text">
<br>
<label for="tickets">tickets</label><input id="tickets" type="text">
<br>
<br>
<input type="button" value="Save" onclick="insert(this.form.title.value)">
<input type="button" value="Show data" onclick="show()"> <br>
<h2><b>Data:</b></h2>
<hr>
</div>
<div id= "display">
</div>
</body>
</html>
var title=new Array();
var name=new Array();
var tickets=new Array();
function insert(val){
title[title.length]=val;
}
function show() {
var string="<b>All Elements of the Array :</b><br>";
for(i = 0; i < title.length; i++) {
string =string+title[i]+"<br>";
}
if(title.length > 0)
document.getElementById('myDiv').innerHTML = string;
}

You're not actually going out after the values. You would need to gather them like this:
var title = document.getElementById("title").value;
var name = document.getElementById("name").value;
var tickets = document.getElementById("tickets").value;
You could put all of these in one array:
var myArray = [ title, name, tickets ];
Or many arrays:
var titleArr = [ title ];
var nameArr = [ name ];
var ticketsArr = [ tickets ];
Or, if the arrays already exist, you can use their .push() method to push new values onto it:
var titleArr = [];
function addTitle ( title ) {
titleArr.push( title );
console.log( "Titles: " + titleArr.join(", ") );
}
Your save button doesn't work because you refer to this.form, however you don't have a form on the page. In order for this to work you would need to have <form> tags wrapping your fields:
I've made several corrections, and placed the changes on jsbin: http://jsbin.com/ufanep/2/edit
The new form follows:
<form>
<h1>Please enter data</h1>
<input id="title" type="text" />
<input id="name" type="text" />
<input id="tickets" type="text" />
<input type="button" value="Save" onclick="insert()" />
<input type="button" value="Show data" onclick="show()" />
</form>
<div id="display"></div>
There is still some room for improvement, such as removing the onclick attributes (those bindings should be done via JavaScript, but that's beyond the scope of this question).
I've also made some changes to your JavaScript. I start by creating three empty arrays:
var titles = [];
var names = [];
var tickets = [];
Now that we have these, we'll need references to our input fields.
var titleInput = document.getElementById("title");
var nameInput = document.getElementById("name");
var ticketInput = document.getElementById("tickets");
I'm also getting a reference to our message display box.
var messageBox = document.getElementById("display");
The insert() function uses the references to each input field to get their value. It then uses the push() method on the respective arrays to put the current value into the array.
Once it's done, it cals the clearAndShow() function which is responsible for clearing these fields (making them ready for the next round of input), and showing the combined results of the three arrays.
function insert ( ) {
titles.push( titleInput.value );
names.push( nameInput.value );
tickets.push( ticketInput.value );
clearAndShow();
}
This function, as previously stated, starts by setting the .value property of each input to an empty string. It then clears out the .innerHTML of our message box. Lastly, it calls the join() method on all of our arrays to convert their values into a comma-separated list of values. This resulting string is then passed into the message box.
function clearAndShow () {
titleInput.value = "";
nameInput.value = "";
ticketInput.value = "";
messageBox.innerHTML = "";
messageBox.innerHTML += "Titles: " + titles.join(", ") + "<br/>";
messageBox.innerHTML += "Names: " + names.join(", ") + "<br/>";
messageBox.innerHTML += "Tickets: " + tickets.join(", ");
}
The final result can be used online at http://jsbin.com/ufanep/2/edit

You have at least these 3 issues:
you are not getting the element's value properly
The div that you are trying to use to display whether the values have been saved or not has id display yet in your javascript you attempt to get element myDiv which is not even defined in your markup.
Never name variables with reserved keywords in javascript. using "string" as a variable name is NOT a good thing to do on most of the languages I can think of. I renamed your string variable to "content" instead. See below.
You can save all three values at once by doing:
var title=new Array();
var names=new Array();//renamed to names -added an S-
//to avoid conflicts with the input named "name"
var tickets=new Array();
function insert(){
var titleValue = document.getElementById('title').value;
var actorValue = document.getElementById('name').value;
var ticketsValue = document.getElementById('tickets').value;
title[title.length]=titleValue;
names[names.length]=actorValue;
tickets[tickets.length]=ticketsValue;
}
And then change the show function to:
function show() {
var content="<b>All Elements of the Arrays :</b><br>";
for(var i = 0; i < title.length; i++) {
content +=title[i]+"<br>";
}
for(var i = 0; i < names.length; i++) {
content +=names[i]+"<br>";
}
for(var i = 0; i < tickets.length; i++) {
content +=tickets[i]+"<br>";
}
document.getElementById('display').innerHTML = content; //note that I changed
//to 'display' because that's
//what you have in your markup
}
Here's a jsfiddle for you to play around.