Develop Reference

Managing order of HTML elements when adding them using innerHTML

I'm generating a form using document.getElementById.innerHTML and the form is supposed to have a submit button at last. But the form has variable number of fields which are added by clicking on a button, the problem is when a field is added it is inserted below the save button.
<button class="fontButton" onClick="addField()">&plus;</button>
<form id="tasksDataForm"></form>
<script>
var f = document.getElementById("tasksDataForm");
function addField() {
var tasksDataFields = `<br/> <input type="text"> <br/>`;
<!-- I have to put this button to end of the form and all fields that are added to form should be inserted above it -->
if(tasks.innerHTML == ''){
tasks.innerHTML += '<input type="submit" value="Save">';
}
tasks.innerHTML += tasksDataFields;
}
</script>

Thanks to Randy Casburn for the suggestion, it did the trick.
<button class="fontButton" onClick="addField()">&plus;</button>
<form id="tasksDataForm">
<div id="fieldsDiv"></div>
<div id="submitDiv"></div>
</form>
<script>
var tasks = document.getElementById("fieldsDiv");
function addField() {
var tasksDataFields = `<br/> <input type="text"> <br/>`;
var submitDiv = document.getElementById("submitDiv");
if(submitDiv.innerHTML == '')
submitDiv.innerHTML += '<input type="submit" value="Save">';
tasks.innerHTML += tasksDataFields;
}
</script>

Dynamic Javascript Div

Got JS Fiddle to work
http://jsfiddle.net/pskjxofo/
Attached I have the following function, the purpose of which is to perform basic calculation. I also added a feature for adding more boxes for calculation. What I am currently stuck on is how to tell Javascript to make dynamic divs, and how to tell it to perform the same calculations for each line every time I click on Calculate. Assistance on this would be greatly appreciated. Thank you all in advance.
<div id="redo">
2 X
<input type="text" id="initial">
= <input type="text" id="solved">
<input type="submit" value="Calculate" onclick="calculait()">
<input type="submit" value="Add Another Box" onclick="addmore()">
</div>
<div id="main"></div>
<script type="text/javascript">
function calculait(){
var first = document.getElementById('initial');
var second = document.getElementById('solved');
second.value = first.value * 2;
}
function addmore(){
var bar = document.getElementById('main');
bar.innerHTML = bar.innerHTML + "<div id='redo'>2 X
<input type='text' id='initial'> = <input type='text' id='solved'>
<input type='submit' value='Calculate' onclick='calculait()'
<input type='submit' value='Add Another Box' onclick='addmore()";
}
</script>

Here is one of the many ways to do it. You could have this HTML structure:
<div id="main">
<div class="operation">
2 X <input type="text" class="initial"/>=
<input type="text" class="solved"/>
</div>
</div>
<input type="submit" value="Calculate" onclick="calculait()"/>
<input type="submit" value="Add Another Box" onclick="addmore()"/>
And this JS:
// Main container for all operations
var main = document.getElementById('main');
// Piece of HTML you'll be duplicating
var op = document.getElementsByClassName('operation')[0].outerHTML;
function calculait() {
// Get every operation div
var operations = document.getElementsByClassName('operation');
// For each of them, calculate
for(var i=0, l=operations.length; i<l; i++){
operations[i].getElementsByClassName('solved')[0].value =
parseFloat(operations[i].getElementsByClassName('initial')[0].value) * 2;
}
}
function addmore() {
main.insertAdjacentHTML('beforeend',op);
}
JS Fiddle Demo

If I understood correctly, I think this code will help.
First of all, change your ids for classes (IDs must be always unique in the page).
<input type="text" class="initial">
<input type="text" class="solved">
And in the JS, you use a for to iterate for this elements.
function calculait() {
var initial = document.getElementsByClassName('initial');
var solved = document.getElementsByClassName('solved');
for (var i = 0; i < initial.length; i++) {
solved[i].value = initial[i].value * 2;
}
}
function addmore() {
var bar = document.getElementById('main');
var html = "<div>2 X ";
html += "<input type='text' class='initial'> = ";
html += "<input type='text' class='solved'>";
html += "</div>";
bar.innerHTML = bar.innerHTML + html;
}
JSFiddle: http://jsfiddle.net/pskjxofo/2/
Give it a try and let me know if it helps!

When you write JavaScript use a debugger, your code didn't parse. You can find one in your browser by hitting F12.
Don't repeat yourself. A clean solution is to put html to duplicate into a template or similar and call a function to copy it.
Use input type=number for numbers.
<html>
<meta charset="utf-8">
<template id="calculate_template">
<form id="" class="calculate_form">
<input value="2" type="number" name="initial_1"> X
<input type="number" name="initial_2"> =
<input type="number" name="solved" disabled="disabled" >
</form>
</template>
<div id="main">
<button onclick="addmore();">Add Another Box</button>
<button onclick="calculate();">Calculate</button>
</div>
<script type="text/javascript">
function calculate(){
/*Calculates all*/
var forms = document.getElementsByClassName('calculate_form'),
i,
length = forms.length;
for(i = 0; i < length; i++){
console.log(forms[i]);
forms[i]['solved'].value = forms[i]['initial_1'].value * forms[i]['initial_2'].value;
}
}
function addmore(){
var main = document.getElementById('main');
main.insertAdjacentHTML("beforeend", document.getElementById('calculate_template').innerHTML);
}
addmore();
</script>
</html>
Demonstration

Here's a way of doing it:
var counter = 0;
function calculait(calculationId) {
var first = document.getElementById('initial' + calculationId);
var second = document.getElementById('solved' + calculationId);
second.value = first.value * 2;
}
function addmore() {
counter++;
var bar = document.getElementById('main');
var newDiv = document.createElement("div");
newDiv.id = "redo" + counter;
newDiv.innerHTML = "2 X <input type='text' id='initial" + counter + "'/> = <input type='text' id='solved" + counter + "'/><input type='submit' value='Calculate' onclick='calculait(" + counter + ")'/><input type='submit' value='Add Another Box' onclick='addmore(" + counter + ")'/>";
bar.appendChild(newDiv);
}
<div id="main"><div id="redo0">2 X <input type="text" id="initial0" /> = <input type="text" id="solved0" /><input type="button" value="Calculate" onclick="calculait(0)" /><input type="button" value="Add Another Box" onclick="addmore(0)" /></div>
</div>

HTML
<p id="operations"></p>
<p>
<input type="submit" value="Calculate" onclick="calc()" />
<input type="submit" value="Add operation" onclick="addOp()" />
</p>
Javascript
var id = 0, multiplier = 2;
var operations = document.getElementById('operations');
function addOp() {
++id;
var p = document.createElement("p");
var right = document.createElement("input");
right.id = 'right_' + id;
right.type = 'text';
var result = document.createElement('input');
result.id = 'result_' + id;
right.type = 'text';
p.innerHTML = multiplier + ' x ';
p.appendChild(right);
p.innerHTML += ' = ';
p.appendChild(result);
operations.appendChild(p);
}
function calc() {
for(var i = 1; i <= id; i++) {
var right = document.getElementById('right_' + i);
var result = document.getElementById('result_' + i);
result.value = multiplier * right.value;
}
}
addOp();
JSFiddle : http://jsfiddle.net/0Lcg0pyz/

Loading Values into auto generated HTML input elements using javascript

I am using a javascript function to populate html element generated automatically after submitting a form from a different div.
Here is the html:
<html >
<body>
<div class="wrapper">
<div id="one">
<form name="form">
<fieldset>
<legend>BILLING</legend>
<div> <label for="ex1">Procedure/Drug</label>
<input type="text" name="procdrug" id="procdrug"/><br><br>
<label>Amount</label>
<input type="text" name="amount" id="amount"/><br><br>
<input type="button" onclick="addInput()" name="add" value="Add input field" style="margin-left:150px" />
</div>
</fieldset>
</form>
</div>
<div id="two">
<fieldset>
<legend>TN QUEUE</legend>
<label><B>Procedure/Drug</b></label><label><b>Amount</b></label><br>
<div id="text">
</div>
<label><b>Total</b></label>
<input type="text" name="total" id="total"/>
</fieldset>
</div>
</body>
</html>
Here is the javascript function
<script language="javascript">
fields = 0;
function addInput() {
var amount=document.getElementById('amount').value;
var pd=document.getElementById('procdrug').value;
if (fields != 10)
{
document.getElementById('text').innerHTML += "<input id='pdgen' type='text'/>";
document.getElementById('text').innerHTML += "<input id='amtgen' type='text'/><br />";
document.getElementById('pdgen').value=pd;
document.getElementById('amtgen').value=amount;
fields += 1;
}
else
{
document.getElementById('text').innerHTML += "<br />Only A Maximum of 10 is allowed.";
document.form.add.disabled=true;
}
}
</script>
The generated elements values are posted from the form and increment on every submit. My problem is the only on submit first element is updated with the new value:
Sample results
Procedure/Drug Amount
Amoxyl 200
blank element blank element
blank element blank element
blank element blank element
Total

The problem is you are adding your elements with the .innerHtml += method which is avoiding the values entered before. You need to use appendChild method to add new elements. Here is your new code :
fields = 0;
function addInput() {
var amount=document.getElementById('amount').value;
var pd=document.getElementById('procdrug').value;
var br = document.createElement('br');
if (fields != 10)
{
var input1 = document.createElement('input');
input1.setAttribute('id','pdgen' + fields);
input1.value = pd;
var input2 = document.createElement('input');
input2.setAttribute('id','amtgen' + fields);
input2.value = amount;
document.getElementById('text').appendChild(input1);
document.getElementById('text').appendChild(input2);
document.getElementById('text').appendChild(br);
fields++;
}
else
{
document.getElementById('text').innerHTML += "<br />Only A Maximum of 10 is allowed.";
document.form.add.disabled=true;
}
}
FIDDLE

passing a javascript variable into a hidden form in codeigniter

I have a page in Codeigniter in which i can set the product quantity (sq.m) that the client wants to buy. When the client sets the quantity i have to do some calculations (about the quantity number whis was set before) and i am doing that with Javascript setting some variables. Now i want to show these variables in the same (php) page and it's working, but i don't know what should i do to put these variables in the values of the hidden inputs so that i can send them to the controller. Here is the coding:
<input type="text" name="productQuantity">
<input type="button" class="button" onclick="return showHide();" value="Calculate Packs">
<script type="text/javascript" language="javascript">// <![CDATA[
function showHide() {
var ele = document.getElementById("showHideDiv");
if(ele.style.display == "block") {
ele.style.display = "none";
}
else {
<?php $pack = explode(' ', $pro->productPackSize); ?>
ele.style.display = "block";
var val = document.getElementById('productQuantity').value;
document.getElementById('val').innerHTML = val;
var req = Math.round(val/<?php echo $pack[0]; ?>);
document.getElementById('req').innerHTML = req;
var total = req * <?php echo $pack[0]; ?>;
document.getElementById('total').innerHTML = total;
}
}
// ]]></script>
<div id="showHideDiv" style="display:none;">
<?php echo form_open('main/add_to_cart_validation/' . $pro->productId); ?>
To cover <strong id="val"></strong> sq.m, you will need <strong id="req"></strong> Packs
which is <strong id="total"></strong> sq.m in total</a> //the ids' here are working, i can show them in the page
<input type="hidden" id="" value="" name="productPacks"> //how can i get the 'reg' variable here?
<input type="hidden" id="" value="" name="productQuantity"> //the same here as above for 'total' variable
<input type="submit" class="button" value="Add to Cart">
</form>
</div>
Thanks for your answers

Add these lines in the else condition after your math:
document.getElementById("productPacks").value = val;
document.getElementById("productQuantity").value = total;

Starty by giving your inputs an id and then you can pass the values like this :
document.getElementById('myField').value = total;

It is very simple.You do it the same way.
var MyHiddenValue = document.getElementById('myHiddenField').value;
alert(MyHiddenValue);
WORKING FIDDLE

Check sum of inputs before submit

I need some help: I have the following form:
<form id="myForm" method="post" action="?action=agc">
<input type="hidden" name="start_date" value="<?= $_POST['start_date'] ?>" />
<input type="hidden" name="end_date" value="<?= $_POST['end_date'] ?>" />
<input type="hidden" name="c_name" value="<?= $_POST['c_name'] ?>" />
<input type="hidden" name="cluster" value='<?= $abn_cluster[0] ?>' />
<input type="hidden" name="abn" value="abn" />
Add percent <br /><br />
ABN percent<br />
<input type="text" name="poll[option][0][percent]" class="toAdd"> <input type="text" name="poll[option][0][name]" value="<?= $_POST['c_name'] ?>_0_"> <input type="checkbox" class="optionBox" value="True" name="poll[option][0][control_sample]" /><br />
<script>
var optionNumber = 1;
function addOption() {
var theForm = document.getElementById("myForm");
var newOption = document.createElement("input");
var newOption2 = document.createElement("input");
var newOption3 = document.createElement("input");
var newLabel = document.createElement("label");
var newContent = document.createTextNode(" ");
var newContent2 = document.createTextNode(" ");
newOption.name = "poll[option]["+optionNumber+"][percent]";
newOption.type = "text";
theForm.appendChild(newOption);
theForm.appendChild(newContent);
newOption2.name = "poll[option]["+optionNumber+"][name]";
newOption2.type = "text";
newOption2.value = "<?= $_POST['c_name'] ?>_"+optionNumber+"_"
theForm.appendChild(newOption2);
theForm.appendChild(newContent2);
newOption3.name = "poll[option]["+optionNumber+"][control_sample]";
newOption3.type = "checkbox";
newOption3.className = "optionBox";
newOption3.value = "True"
theForm.appendChild(newOption3);
theForm.appendChild(document.createElement("br"));
optionNumber++;
}
</script>
</p>
</div>
<div class="modal-footer" id="appendform">
<button type="submit" class="btn btn-primary">Continue</button>
</form>
Now because some of the inputs are generated on request, I have no idea how to check the sum of the(.toAdd). And I basically need to make sure that it's equal to 100 before submitting. What would be a solution to my problem? Thanks.

Try
<form id="myForm" method="post" action="iap_crm_campaign.php?action=abngamecampaign" onsubmit="return validate()">
Then
function validate(){
var sum = 0;
for(var i = 0; i < optionNumber; i++){
sum += parseFloat(document.getElementsByName('poll[option][' + i + '][percent]')[0].value);
}
if( sum == NaN || sum != 100){
alert('Sum of percentage must be 100');
return false;
}
}
Demo: Fiddle

var total = 0;
var toAdds = document.getElementsByClassName("toAdd");
for (var i = 0; i < toAdds.length; i++) {
total += parseInt(toAdds[i].value, 0);
}
if (total == 100) {
// OK
} else {
// not OK
}
Also, your code for adding new options needs to set the class:
newOption.className = "toAdd";

you can use jquery
$(".toAdd").length
or in simple js
var myInputs= document.getElementsByTagName('input');
var noOfInputs =myInputs.length;
well this will give you the count of i/p elements through loop, for summing the values...
var sum;
$(".toAdd").each(function() {
sum=sum+$(this).val();
});