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attribute starts with selector ,working for first input field(not for others)

Here i am having an issue with attribute starts with selector ,i have tried to do validation of multiple fields ,having dynamic ids ,but not succeed .
below is what i tried so far .
i have seen other suggestion in So,but unable to made it.
$("input[id^='product-unit-price-']").keydown(function (event) {
});
Html
<input type="text" class="form-control pro-input valfields" id="product-unit-price-<?php echo $id;?>" name="unit_price[]" onblur="getTotalPrice(<?php echo $id;?>)" required="">
here id is dynamic like
product-unit-price-0
product-unit-price-1
product-unit-price-2
product-unit-price-3
and so on..
here its working for only the first id (product-unit-price-0) ,but not for rests.
Its all the things.
Suggest me.
thank you.

I think you are using $("input[id^='product-unit-price-']") to refer the element inside the handler in this case while applying val() method which always return the value of the first element, not the element which is fired the event. In such case use $(this) to refer the element where this refers to the dom object of event fired element.
$("input[id^='product-unit-price-']").keydown(function (event) {
// refer element by `$(this)`
})
FYI : It's always better to provide a common class for the group of the element and select based on that which is the better way to do it.

Why you not go with class selector?
$(".form-control.pro-input.valfields").keydown(function (event) {
// your logics here
}
Because from class selector you can select set of same class group elements and apply event on each element of set.

How to replace all id from href?

I have the following markup
<div class = "general">
<div id ="custom"></div>
</div>
How to change id = "custom" in all <div> with class="general" from href on page using jQuery?

You can try this:
$("div.general").each(function() {
$(this).children("div#custom").text($(this).children("a").attr("href"));
});
If I understand you correctly, you want to iterate through all div.generals, and change the text of each child div#custom to the href of the child a.
See a working example on JSfiddle.
Also, another tip is to avoid using multiple elements with the same id. In your code you have a <div> with id="custom". You also say that the div.general appears multiple times — therefore, the id "custom" will appear multiple times. This is bad practice. I suggest that you change id to class.

You need to loop through all div.general and replace the id attribute of div#custom to whatever is there as the anchors href property. The following code will work:
$(".general").each(function(){
$(this).find("#custom").attr("id", $(this).find("a").attr("href").replace("#", ""));
})
Here the .find() will dig out elements from any depth inside the parent. If you are sure about the DOM position of the elements, you can change the .find() to .children()

jQuery - find all inputs, except the ones descending from div

Well I'm trying to write a validation jQuery plugin, but for that I need to find all inputs inside of a container, which is marked with an attribute. However, that container may have other sub-containers, also marked with attributes, and they may have their own inputs.
I need to select all inputs, descendants of the parent container (accessed by $(this)) which are not descendants of the sub-containers. Is that possible?
Some code to illustrate:
<div data-container>
<input>
<div class="form-group">
<input>
</div>
<input>
<div data-container>
<input>
<input>
<input>
</div>
</div>
I want to select those first three inputs, and ignore the ones inside the children data-container. The one inside the form-group must be selected too.

Use .not() to exclude a selection from an existing jQuery selection:
var yourSelection = $(this).find('input').not($(this).find('[data-container] input'));
JSFiddle (I replaced the $(this) by $('[data-container]:first') in the fiddle for simplicity)

This should work, here http://jsfiddle.net/2Wv7P/
$('div[data-container] input:lt(3)')

You can select based on the parent div like this. Only the first level children are going to be selected based on you given tag, assuming you ID the parent div as #parent
$('#parent > input')
So following this path, if you have to select the parent with $(this), which is to say using 'this', then you can select this same set of 'input's using
$('#' + this.id + ' > input')
For example
see this fiddle

Dynamically adding onchange function to drop down with jQuery

I have a couple of drop down boxes with ids country1, country2, ... When the country is changed in a drop down the value of the country shoudl be displayed in an alert box.
if I add the onchange handler for one box like this it works fine:
$('#country1') .live('change', function(e){
var selectedCountry = e.target.options[e.target.selectedIndex].value;
alert(selectedCountry);
});
But I need to do this dynamically for all drop down boxes so I tried:
$(document).ready(function() {
$('[id^=country]') .each(function(key,element){
$(this).live('change', function(e){
var selectedCountry = e.target.options[e.target.selectedIndex].value;
alert(selectedCountry);
});
});
});
This doesn't work. No syntax error but just nothing happens when the seleted country is changed. I am sure that the each loop is performed a couple of times and the array contains the select boxes.
Any idea on that?
Thanks,
Paul

The reason .live() existed was to account for elements not present when you call the selector.
$('[id^=country]') .each(function(key,element){ iterates over elements that have an id that starts with country, but only those that exist when you run the selector. It won't work for elements that you create after you call .each(), so using .live() wouldn't do you much good.
Use the new style event delegation syntax with that selector and it should work:
$(document).on('change', '[id^=country]', function(e) {
// ...
});
Replace document with the closest parent that doesn't get dynamically generated.
Also, consider adding a class to those elements along with the id attribute.

Instead of incremental ids I'd use a class. Then the live method is deprecated but you may use on with delegation on the closest static parent or on document otherwise.
$('#closestStaticParent').on('change', '.country', function() {
// this applies to all current and future .country elements
});
You don't need an each loop this way; plus events are attached to all the elements in the jQuery collection, in this case all .country elements.

Exclude Element from .html()

I have to remove a specific element (button with #add_phone) from .html() of jquery.
So here's the thing. At first there are field(phone number) + select(phone type) + button(#add_phone), and all three are enclosed in div as a container. And when I click the button, it will recreate that through .html().
The JS is as follows:
$('#add_phone').click(function() {
$('div.multiple_number:last').after('<div id="phone_div_id' + phone_div_id + '" class="multiple_number">'+ $('div.multiple_number').html() +'</div>');
...
//append a remove [-] button, etc...
});
and here's the html:
<div class="multiple_number" id="phone_div_id0">
<label>Phone Number(s):</label>
<input name="phone" id="phone[]" placeholder="Phone Number"/>
<select name="phone_type[]" id="phone_type">
<option value="1">Mobile</option>
<option value="2">Home</option>
<option Value="3">Office</option>
<option Value="3">Fax</option>
</select>
<input type="button" name="add_phone" class="add_phone_class" id="add_phone" value="ADD MORE" />
</div>
So in effect, I am creating multiple phone numbers for a form. But, here's the problem. Inside is an input type="button" (#add_phone button). And I would want to exclude it from .html().
I have tried:
$('div.multiple_number:not(#add_phone)').html()
$('div.multiple_number:not(input#add_phone)').html()
$('div.multiple_number:not(#add_phone)').not(#add_phone).html()
$('div.multiple_number:not(#add_phone)').not(input#add_phone).html()
And the class name counterpart instead of using id name. I wouldn't also want to place the #add_phone button outside the div, for aesthetics reason.

I'm a little bit unclear about what you're looking for, but I assume that when the #add_phone button is clicked, you want the form to be duplicated and added below it with the exception of the #add_phone button itself.
Working off that assumption, the following should work
$('#add_phone').click(function() {
var numberForms = $('div.multiple_number');
var newNumberForm = numberForms.eq(0).clone(true);
newNumberForm.find('#add_phone').remove();
newNumberForm.attr('id', 'phone_div_id' + numberForms.length);
numberForms.last().after(newNumberForm);
});
Here's a live jsfiddle demo to show it working.
Your initial attempts didn't work for a few reasons. The main one being that :not() selector and .not() methods only operate on the element being selected. It doesn't filter based on child elements. Those methods would only work if the element you were selecting <div class="multiple_number" /> also had the ID add_phone.
Also, it is not recommended to use .html() as a way of cloning methods. Using string manipulation as an alternative to direct DOM manipulation can cause problems later on. Using .html() will force you to have to re-bind event handlers to the newly created DOM elements. The strategy I've provided above should be more future-proof, since it will also clone event handlers for any elements being copied. There are also cases where certain browsers will not replicate the original elements exactly when calling .html(), which is another reason to avoid it unless you have a specific reason for serializing your DOM elements as a string.

Try this instead :
var innerHTML = $("div.multiple_number").html()
.replace($("div.multiple_number input#add_phone").html(), "");
Good Luck