Develop Reference

How to display rounded values in a form and show on focus the original values?

I have numeric values with many decimal places and the precision is required for other functions. I want to present the values in a form, so the user can change the values if necessary.
To increase the readability, I want to display the values rounded to 2 decimal places, but if the user clicks on an input field, the complete value should be presented. By doing this, the user can see the real value and adjust them better.
Example:
HTML
<button id="myBtn" onclick="fillForm()">Try it</button>
<form id="myForm" >
<fieldset>
<input type="text" id="myInput1" onchange="myFunction()" >
</fieldset>
</form>
JavasSript
<script>
//Example values that should be presented
var x = 3.14159265359;
function fillForm(){
document.getElementbyId("myInput1").value = x;
}
function myFunction(){
x = document.getElementbyId("myInput1");
}
</script>
The form input value should be " 3.14 " and if the user clicks in the field, the displayed value should be 3.14159265359.
Now the user can change the value and the new value has to be saved.
Because this is for a local 1 page website with no guaranty of internet connection, it would be an asset but not a requirement, to do it without an external script (jquery …).

you can use focus and blur event to mask/unmask you float, then simply store the original value in a data param, so you can use the same function to all input in your form ;)
function fillForm(inputId, val)
{
var element = document.querySelector('#'+inputId);
element.value = val;
mask(element);
}
function mask(element) {
element.setAttribute('data-unmasked',element.value);
element.value = parseFloat(element.value).toFixed(2);
}
function unmask(element) {
element.value = element.getAttribute('data-unmasked') || '';
}
<button onclick="fillForm('myInput1',3.156788)">Fill!</button>
<form id="myForm" >
<fieldset>
<input type="text" id="myInput1" onblur="mask(this)" onfocus="unmask(this)" >
</fieldset>
</form>
Edit: added "fillForm()" :)

Just use .toFixed(). It accepts one argument, an integer, and will display that many decimal points. Since Javascript primitives are immutable, your x variable will remain the same value. (also when getting/setting the value of an input use the .value property
function fillForm(){
document.getElementbyId("myInput1").value = x.toFixed(2);
}
If you need to save it you can store it in a new value
var displayX = x.toFixed(2)

Here is my solution. I hope you have other suggestions.
HTML
<form id="myForm" >
<fieldset>
<input type="text" id="myInput1" >
</fieldset>
</form>
<button id="myBtn" onclick="fill_form()">fill form</button>
JavasSript
<script>
var apple_pi = 10.574148541;
var id_form = document.getElementById("myForm");
//Event listener for form
id _form.addEventListener("focus", copy_input_placeh_to_val, true);
id _form.addEventListener("blur", round_input_2decimal, true);
id _form.addEventListener("change", copy_input_val_to_placeh, true);
// Replace input value with input placeholder value
function copy_input_placeh_to_val(event) {
event.target.value = event.target.placeholder;
}
// Rounds calling elemet value to 2 decimal places
function round_input_2decimal(event) {
var val = event.target.value
event.target.value = Number(val).toFixed(2);
}
// Replace input placeholder value with input value
function copy_input_val_to_placeh(event) {
event.target.placeholder = event.target.value;
}
// Fills input elements with value and placeholder value.
// While call of function input_id_str has to be a string ->
//fill_input_val_placeh("id", value) ;
function fill_input_val_placeh (input_id_str, val) {
var element_id = document.getElementById(input_id_str);
element_id.placeholder = val;
element_id.value = val.toFixed(2);
}
// Writes a value to a form input
function fill_form(){
fill_input_val_placeh("myInput1", apple_pi);
}
</script>
Here is an running example
https://www.w3schools.com/code/tryit.asp?filename=FLDAGSRT113G

Here is solution, I used focus and blur listeners without using jQuery.
I added an attribute to input named realData
document.getElementById("myInput1").addEventListener("focus", function() {
var realData = document.getElementById("myInput1").getAttribute("realData");
document.getElementById("myInput1").value = realData;
});
document.getElementById("myInput1").addEventListener("blur", function() {
var realData = Number(document.getElementById("myInput1").getAttribute("realData"));
document.getElementById("myInput1").value = realData.toFixed(2);
});
function fillForm(value) {
document.getElementById("myInput1").value = value.toFixed(2);
document.getElementById("myInput1").setAttribute("realData", value);
}
var x = 3.14159265359;
fillForm(x);
<button id="myBtn" onclick="fillForm()">Try it</button>
<form id="myForm" >
<fieldset>
<input type="text" id="myInput1" realData="" onchange="myFunction()" >
</fieldset>
</form>
jsfiddle : https://jsfiddle.net/mns0gp6L/1/

Actually there are some problems that needs to be fixed in your code:
You are redeclaring the x variable inside your myFunction function with var x =..., you just need to refer the already declared x without the var keyword.
Instead of using document.getElementById() in myFunction, pass this as a param in onchange="myFunction(this)" and get its value in the function.
Use parseFloat() to parse the value of your input to a float, and use .toFixed(2) to display it as 3.14.
This is the working code:
var x = 3.14159265359;
function fillForm() {
document.getElementById("myInput1").value = x.toFixed(2);
}
function myFunction(input) {
x = parseFloat(input.value);
}
To display the original number when you click on the input you need to use the onfocus event, take a look at the Demo.
Demo:
var x = 3.14159265359;
function fillForm() {
document.getElementById("myInput1").value = x.toFixed(2);
}
function focusIt(input){
input.value = x;
}
function myFunction(input) {
x = parseFloat(input.value);
}
<button id="myBtn" onclick="fillForm()">Try it</button>
<form id="myForm">
<fieldset>
<input type="text" id="myInput1" onchange="myFunction(this)" onfocus="focusIt(this)">
</fieldset>
</form>

How to apply keypress and mousedown event on dynamically created textbox

I am working in an application where i have three textboxes dynamically polulated,one is for input value 2nd one is for a time and 3 rd one is also for a time both 2nd and 3 rd boxes have timepicker api in it.So now what i need i will type something in the textbox and also select time from those two timepicker boxes and values will be appending on the respective textboxes on top of them.Like i am giving a fiddle where i have implemented the situation i have reached so far,This is it DEMO
So i will write something on textbox1 and that will be that will be showing on textbox on top of it and also i will select a time from 2 nd box and 3 rd box and that will be on the 2 nd and 3 box on top of that.I am trying to use keypress and mousedown but that is not working on dynamic population of the textboxes like i tried using
$('#TextBoxContainer').on('keypress', 'input', function () {
});
But this is not giving the value of the textboxes .Somebody please help

Try this code.
Note : I used comma to separate the values from different text boxes.
Demo
HTML
<input id="text1" type="text" value="" />
<input id="text2" type="text" value="" />
<input id="text3" type="text" value="" />
<div id="TextBoxContainer">
<input id="btnAdd" type="button" value="Add" />
</div>
JS
$(function () {
$("#btnAdd").bind("click", function () {
var div = $("<div />");
div.html(GetDynamicTextBox(""));
$("#TextBoxContainer").append(div);
$(".time").timepicker();
$('.txt1,.txt2,.txt3').change(function () {
UpdateData()
});
});
$("#btnGet").bind("click", function () {
var valuesarr = new Array();
var phonearr = new Array();
var phonearr1 = new Array();
$("input[name=DynamicTextBox]").each(function () {
valuesarr.push($(this).val());
$('#DynamicTextBox').val(valuesarr);
});
$("input[name=phoneNum]").each(function () {
phonearr.push($(this).val());
$('#phoneNum').val(phonearr);
});
$("input[name=phoneNum1]").each(function () {
phonearr1.push($(this).val());
$('#phoneNum1').val(phonearr1);
});
alert(valuesarr);
alert(phonearr);
alert(phonearr1);
});
$("body").on("click", ".remove", function () {
$(this).closest("div").remove();
});
});
function GetDynamicTextBox(value) {
return '<input class="txt1" name = "DynamicTextBox" type="text" value = "' + value + '" /> <input class="txt2 time" id="myPicker" class="time" type="text" /> <input name = "phoneNum1" id="phoneNum1" class="time txt3" type="text" /><input type="button" value="Remove" class="remove" />';
}
function UpdateData() {
var text1 = ''
$('#TextBoxContainer').find('.txt1').each(function (index, Obj) {
if ($(Obj).val()) text1 += $(Obj).val() + ','
})
$('#text1').val(text1)
var text2 = ''
$('#TextBoxContainer').find('.txt2').each(function (index, Obj) {
if ($(Obj).val()) text2 += $(Obj).val() + ','
})
$('#text2').val(text2)
var text3 = ''
$('#TextBoxContainer').find('.txt3').each(function (index, Obj) {
if ($(Obj).val()) text3 += $(Obj).val() + ','
})
$('#text3').val(text3)
}

If I understood you correctly, you don't need processing keypress and mousedown events.
You just need to process onsubmit event of your form. Just read values from textbox, DateTimeBox, DateTimeBox and paste them to newly created textbox2, DateTimeBox21, DateTimeBox22.

In case you want to create dynamicly 3 input boxes with the value of text1 text2 and text3 here is the result.
And this is pretty much what i've changed:
...
$("#btnAdd").bind("click", function () {
var a = $("#text1");
var b = $("#text2");
var c = $("#text3");
var div = $("div");
div.html(GetDynamicTextBox(a, b , c));
...
Obviously in GetDynamicTextBox() function i'm filling the InputBoxes with the expected values (from a, b and c).
In case you want to update text1 text2 and text3 with the values of the generated input boxes this would do it:
here is the relevant code i've changed on this one:
$('.txt1').bind('keyup',function(e){
var code = e.which;
if(code==13)e.preventDefault();
if(code==32||code==13||code==188||code==186){
$('#text1').val($('#text1').val()+', '+$(this).val());
}
});
For the above solution to work, you've got to press enter after changing each input box.
In case you preffer to not press enter here you've got a solution which works when the generated input box loses the focus.
This is the relevant code:
$('.txt1').bind('focusout',function(){
$('#text1').val($('#text1').val()+', '+$(this).val());
});
You might want to check if the new value is the same that the old one or not in this one.
PS: I'm showing here the snippet of just the first inputbox since for the rest of them is pretty much the same. The complet solution is in the jsfiddle though.

i have code it can be sum two textbox values using javascript

i have code it can be sum two textbox values using javascript but problem is that when i entered amount into recamt textbox value and javascript count again and again recamt textbox values it should be count only one time recamt textbox value not again and again?
<script type="text/javascript">
function B(){
document.getElementById('advance').value
=(parseFloat(document.getElementById('advance').value))+
(parseFloat(document.getElementById('recamt').value));
return false;
}
</script>
<input class="input_field2" type="text" readonly name="advance"
id="advance" value="50" onfocus="return B(0);" /><br />
<input class="input_field2" type="text" name="recamt" id="recamt">

You could keep a property on the read-only text field to keep the old value:
function B()
{
var adv = document.getElementById('advance'),
rec = document.getElementById('recamt');
if (typeof adv.oldvalue === 'undefined') {
adv.oldvalue = parseFloat(adv.value); // keep old value
}
adv.value = adv.oldvalue + parseFloat(rec.value));
rec.value = '';
return false;
}

You're calling the sum function every time the readonly input is focused using the new value. If you only want it to add to the original value, you need to store it somewhere.
HTML:
<input type="text" id="advance" readonly="readonly" value="50" /><br />
<input type="text" id="recamt">
JS:
var advanceBox = document.getElementById('advance');
var originalValue = advanceBox.value;
advanceBox.onclick = function() {
this.value = parseFloat(originalValue) +
parseFloat(document.getElementById('recamt').value);
return false;
};
http://jsfiddle.net/hQbhq/
Notes:
You should bind your handlers in javascript, not HTML.
The javascript would need to exist after the HTML on the page, or inside of a window.load handler, otherwise it will not be able to find advanceBox.

Fill data in input boxes automatically

I have four input boxes. If the user fills the first box and clicks a button then it should autofill the remaining input boxes with the value user input in the first box. Can it be done using javascript? Or I should say prefill the textboxes with the last data entered by the user?

On button click, call this function
function fillValuesInTextBoxes()
{
var text = document.getElementById("firsttextbox").value;
document.getElementById("secondtextbox").value = text;
document.getElementById("thirdtextbox").value = text;
document.getElementById("fourthtextbox").value = text;
}

Yes, it's possible. For example:
<form id="sampleForm">
<input type="text" id="fromInput" />
<input type="text" class="autofiller"/>
<input type="text" class="autofiller"/>
<input type="text" class="autofiller"/>
<input type="button"value="Fill" id="filler" >
<input type="button"value="Fill without jQuery" id="filler2" onClick="fillValuesNoJQuery()">
</form>
with the javascript
function fillValues() {
var value = $("#fromInput").val();
var fields= $(".autofiller");
fields.each(function (i) {
$(this).val(value);
});
}
$("#filler").click(fillValues);
assuming you have jQuery aviable.
You can see it working here: http://jsfiddle.net/ramsesoriginal/yYRkM/
Although I would like to note that you shouldn't include jQuery just for this functionality... if you already have it, it's great, but else just go with a:
fillValuesNoJQuery = function () {
var value = document.getElementById("fromInput").value;
var oForm = document.getElementById("sampleForm");
var i = 0;
while (el = oForm.elements[i++]) if (el.className == 'autofiller') el.value= value ;
}
You can see that in action too: http://jsfiddle.net/ramsesoriginal/yYRkM/

or if input:checkbox
document.getElementById("checkbox-identifier").checked=true; //or ="checked"

always want to keep first digit of my textfield as 0

hi guys i have a html form where i have a textfield which is having capabilities to enter two digits the first digit is autopopulated to be 0 and i donot want users to change that hows that possible using javascript or jQuery or anything else.

Here is another way.
the onKeyUp might not be how you want it to work but at least you have some ideas
<script>
window.onload=function() {
document.getElementById('part2').focus();
}
</script>
<form onSubmit="this.realvalue.value='0'+document.getElementById('part2').value">
<input type="text" name="realvalue" value="">This can be hidden<br />
<input type="text" style="border-right:0; width:12px" value="0" readonly="readonly" size="1"><input type="text" id="part2" style="border-left:0; width:13px" size="1" maxsize="1"
onKeyUp="this.value=(this.value.length>1)?this.value.substring(-1):this.value">
<input type="submit">

You can use the event "keyup" triggered when the user enters text in the field:
$('#my-input').keyup(function() {
var theInputValue = $(this).val();
// Do whatever you want with the value (like check its length,
// append 0 at the beginning, tell the user not to change first
// character
//
// Set the real value
$(this).val(newValue);
});

You may be better off with a '0' as text in front of a textbox that can only accept a single digit and then prepend the '0' programmatically?

I wrote and tested this code, and works exactly as you expect:
$(function (){
$('#input_id').bind('input',function (){
var val = $(this).val();
var r = val.match(/^[0][0-9]$/g);
if (r !== null){
val = r[0];
if (val.length === 1){
val = '0' + val;
}
}else{
val = '0';
}
$(this).val(val);
});
});
And works for copy/paste too =]