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showing the length of a input

How do I enable input2 if enable 1 has input within it (basically re-enabling it), I'm still a beginner and have no idea to do this.
<form id="form1">
<input type="text" id="text1" onkeyup="valid()">
<input type="text" id="text2" disabled="disabled">
<script language="javascript">
function valid() {
var firstTag = document.getElementById("text1").length;
var min = 1;
if (firstTag > min)
//if the text entered is longer than 1 alert to screen
{
//enable the text2 tag
}
}
//once input from text1 is entered launch this function
</script>
</form>

if i understand your question correctly, you want to enable the second input as long as the first input have value in it?
then use dom to change the disabled state of that input
if(firstTag > min)
//if the text entered is longer than 1 alert to screen
{
//enable the text2 tag
document.getElementById("text2").disabled = false;
}

Please try this code :
var text1 = document.getElementById("text1");
text1.onchange = function () {
if (this.value != "" || this.value.length > 0) {
document.getElementById("text2").disabled = false;
} else {
document.getElementById("text2").disabled = true;
}
}
<input type="text" id="text1">
<input type="text" id="text2" disabled="disabled">

I think you should use .value to get the value. And, then test its .length. That is firstTag should be:
var firstTag = document.getElementById("text1").value.length;
And, the complete function should be:
function valid() {
var min = 1;
var firstTag = document.getElementById("text1");
var secondTag = document.getElementById("text2");
if (firstTag.length > min) {
secondTag.disabled = false
} else {
secondTag.disabled = true
}
}
Let me know if that works.

You can use the .disabled property of the second element. It is a boolean property (true/false).
Also note that you need to use .value to retrieve the text of an input element.
Demo:
function valid() {
var text = document.getElementById("text1").value;
var minLength = 1;
document.getElementById("text2").disabled = text.length < minLength;
}
valid(); // run it at least once on start
<input type="text" id="text1" onkeyup="valid()">
<input type="text" id="text2">

I would just change #Korat code event to keyup like this:
<div>
<input type="text" id="in1" onkeyup="enablesecond()";/>
<input type="text" id="in2" disabled="true"/>
</div>
<script>
var text1 = document.getElementById("in1");
text1.onkeyup = function () {
if (this.value != "" || this.value.length > 0) {
document.getElementById("in2").disabled = false;
} else {
document.getElementById("in2").disabled = true;
}
}
</script>

I tried to create my own so that I could automate this for more than just two inputs although the output is always set to null, is it that I cannot give text2's id from text1?
<div id="content">
<form id="form1">
<input type="text" id="text1" onkeyup="valid(this.id,text2)">
<input type="text" id="text2" disabled="disabled">
<script language ="javascript">
function valid(firstID,secondID){
var firstTag = document.getElementById(firstID).value.length;
var min = 0;
if(firstTag > min)
//if the text entered is longer than 1 alert to screen
{
document.getElementById(secondID).disabled = false;
}
if(firstTag == 0){
document.getElementById(secondID).disabled = true;
}
}
//once input from text1 is entered launch this function
</script>
</form>

First, you have to correct your code "document.getElementById("text1").length" to "document.getElementById("text1").value.length".
Second, there are two ways you can remove disabled property.
1) Jquery - $('#text2').prop('disabled', false);
2) Javascript - document.getElementById("text2").disabled = false;
Below is the example using javascript,
function valid() {
var firstTag = document.getElementById("text1").value.length;
var min = 1;
if (firstTag > min) {
document.getElementById("text2").disabled = false;
}
else
{
document.getElementById("text2").disabled = true;
}
}
<input type="text" id="text1" onkeyup="valid()">
<input type="text" id="text2" disabled="disabled">

If I understand you correctly, what you are asking is how to remove the disabled attribute (enable) from the second input when more than 1 character has been entered into the first input field.
You can to use the oninput event. This will call your function every time a new character is added to the first input field. Then you just need to set the second input field's disabled attribute to false.
Here is a working example.
Run this example at Repl.it
<!DOCTYPE html>
<html>
<body>
<!-- Call enableInput2 on input event -->
<input id="input1" oninput="enableInput2()">
<input id="input2" disabled>
<script>
function enableInput2() {
// get the text from the input1 field
var input1 = document.getElementById("input1").value;
if (input1.length > 1) {
// enable input2 by setting disabled attribute to 'false'
document.getElementById("input2").disabled = false;
} else {
// disable input2 once there is 1 or less characters in input1
document.getElementById("input2").disabled = true;
}
}
</script>
</body>
</html>
NOTE: It is better practice to use addEventListener instead of putting event handlers (e.g. onclick, oninput, etc.) directly into HTML.

validation in if textbox having same values in jquery

I am trying to perform this action like if user choose same value for two different box i have to show some errors.my textbox code as follows.
<input class="order form-control vnumber" type="text" maxlength="1" name="Orderbox[]" required="true">
<input class="order form-control vnumber" type="text" maxlength="1" name="Orderbox[]" required="true">
<input class="order form-control vnumber" type="text" maxlength="1" name="Orderbox[]" required="true">
<input class="order form-control vnumber" type="text" maxlength="1" name="Orderbox[]" required="true">
so the textbox values should be different like 1,2,3,4 it should not be 1,1,1,1 so i have tried real time update using jquery.
$('.order').keyup(function () {
// initialize the sum (total price) to zero
var val = 0;
var next_val=0;
// we use jQuery each() to loop through all the textbox with 'price' class
// and compute the sum for each loop
$('.order').each(function() {
val+=$(this).val();
});
alert(val);
if (next_val==val) {
alert("same value");
}
next_val=val;
});
But its not working as i expected can anybody tell is there any solutions for this.Any help would be appreciated.Thank you.
JFIDDLE:
jfiddle

Try this Demo Fiddle.
var valarr = [];
$('.order').keyup(function () {
var curr = $(this).val();
if (jQuery.inArray(curr, valarr) > -1) {
alert('exists');
} else {
valarr.push(curr);
}
});
You can use arrays to maintain values. To check the existence of value use inArray()

You need to put more of the code inside the .each() loop. Also, change val+= to just val=
$('.order').each(function() {
val=$(this).val();
alert(val);
if (next_val==val) {
alert("same value");
}
next_val=val;
});
And keep in mind next_val is actually the previous value...
fiddle http://jsfiddle.net/phZaL/8/

This will only work if all values entered till now have the same value
jQuery Code
var arr = [];
$('.order').change(function () {
arr.push($(this).val());
if (arr.length > 1) {
if (arr.AllValuesSame()) alert("Values are same");
}
var val = 0;
$.each(arr, function () {
val = parseInt(val) + parseInt(this);
});
$('.val').text(val);
});
Array.prototype.AllValuesSame = function () {
if (this.length > 0) {
for (var i = 1; i < this.length; i++) {
if (this[i] !== this[0]) return false;
}
}
return true;
}
Demo Fiddle
Made with great help from this answer by #Robert

If condition not working in JAVASCRIPT

I have three buttons, + value -. in this when i click + button value will increase and - value will be decrease .. i have wote the code in jSFIDLLE. it working.
And the value should not be minus. so i added one if condition. then my code is not working.
html-
<input type="Button" id='AddButton' value="+" />
<input type="Button" id='BoqTextBox' value="0" />
<input type="Button" id='MinusButton' value="-" />
javascript -
$('#AddButton').on('click', function () {
var input = $('#BoqTextBox');
input.val(parseFloat(input.val(), 10) + 1);
})
$('#MinusButton').on('click', function () {
var input = $('#BoqTextBox');
if(input>0)
{ input.val(parseFloat(input.val(), 10) - 1);}
})

You are comparing a HTML element with 0. You need to compare its value with 0
Try
if (input.val() > 0)

You need to use
if(input.val() > 0)
As
if(input > 0)
Means that you are trying to see if the object, not it's value is bigger than 0, which is not the case as it is an element

Use if(input.val()>0) instead of if(input>0)

You are trying to compare input with 0. You should instead compare the value of input with 0.
Replace
if (input > 0)
with
if (parseInt(input.val()) > 0)

Here it is
$('#AddButton').on('click', function () {
var input = $('#BoqTextBox');
input.val(parseFloat(input.val(), 10) + 1);
})
$('#MinusButton').on('click', function () {
var input = $('#BoqTextBox');
if(input.val()>0)
{ input.val(parseFloat(input.val(), 10) - 1);}
})

Try this:
if(input.val() > 0)

How can I know the duplicate input element value using jquery?

Im new to web dev and jQuery. I have input element binded with blur event.
This is my code:
// this are my input elements:
<input class="input_name" value="bert" />
<input class="input_name" value="king kong" />
<input class="input_name" value="john" />
<input class="input_name" value="john" />
<script>
$(".input_name").bind("blur",function(){
alert(findDuplicate($(this).val()));
})
function findDuplicate(value){
var result = 0;
$(".input_name").each(function{
if($(this).val == value){
result++;
}
});
}
</script>
my main problem is when i change bert to john it returns me 3 result. how would i exempt the event sender from being checked?

Like others have mentioned, you've got a few syntax errors. Also, rather than explicitly iterating over all the inputs, you could just have jQuery find them for you using selectors:
$(".input_name").bind("blur",function(){
alert(findDuplicate($(this).val()));
})
function findDuplicate(value){
return $(".input_name[value='" + value + "']").length - 1;
}

$(".input_name").bind("blur", function () {
alert(findDuplicate(this.value));
})
function findDuplicate(value) {
var result = 0;
$(".input_name").each(function(){
if (this.value == value) {
result++;
}
});
return result - 1;
}
DEMO

Try this (untested):
$(".input_name").bind("blur",function(){
var nth = $(this).index();
alert(findDuplicate($(this).val(),nth));
})
function findDuplicate(value,nth){
var result = 0;
$(".input_name").each(function{
if($(this).val == value && nth != index){
result++;
}
});
return result;
}

Increment input field value with jQuery

What is the shortest way in jQuery (or pure JavaScript) to increment the value of an input field?
For instance
<input id="counter" type="hidden" name="counter" value="1">
so it changes to
<input id="counter" type="hidden" name="counter" value="2">

$('#counter').val( function(i, oldval) {
return parseInt( oldval, 10) + 1;
});
Demo
OR
$('#counter').val( function(i, oldval) {
return ++oldval;
});
Demo
You can wrap any one of the above code within a function and call that for further increment. For example:
function increment() {
$('#counter').val( function(i, oldval) {
return ++oldval;
});
}
Now call increment() when and where you need.

I think that the shortest way is:
$('#counter').get(0).value++
or
$('#counter').get(0).value--

Try this:
var $input = $('#counter');
$input.val( +$input.val() + 1 );​
DEMO

No need for jQuery here, instead use pure JavaScript:
document.getElementById('counter').value++;
Demo: http://jsfiddle.net/RDMPq/
You can move the increment to a function that accepts dynamic IDs for increased portability:
function incrementInput(id){
document.getElementById(id).value++;
}
Demo: http://jsfiddle.net/uyuGY/

You could try this:
jQuery:
Setup a function to do this:
function incrementVal(selector) {
var $item = selector;
var $curVal = $item.attr("value");
$item.attr("value", parseInt($curVal) + 1 );
}
Use it with the click of a button:
$("#increment").on("click",function() {
incrementVal($('#counter'));
});
Your HTML:
<input id="counter" type="hidden" name="counter" value="1">
<button id="increment">Increment field</button>
Hope that helps.