how to get second last element using java script - javascript

I have a drop down of 7 options. I need to get the value of second last option using java script. I wrote something but it is not working .
$('.checkbox4').on('click', function(e) {
var last_chekbox4 = $('.checkbox4:last.prev()');
if (last_chekbox4.is(':checked')) {
$('.checkbox4').prop('checked', false);
$(this).prop('checked', true);
}
});

Use prev() method
$('.checkbox4:last').prev()
If there is some other element in between then use
$('.checkbox4:last').prevAll('.checkbox4').first()
FYI : Above methods don't work if elements are not siblings.
UPDATE :
Or get the last within the collection which excluded the last one using :not() and jQuery :last.
$('.checkbox4:not(:last):last')
Or by the index using eq() method.
var $col = $('.checkbox4');
// get element by index, where index starts from 0
var $ele = $col.eq($col.length - 2);

You have 7 elements. Use nth-of-type selector
$(".checkbox4:nth-of-type(6)");
To select the second last option

Related

Target first and second occurrence of Div on page using Jquery

Hi I am trying to target the first and second occurrence of a div class on a page, I have the following but this does not work?
var first = ($("#area").find(".cArea")[0]);
var second = ($("aArea").find(".cArea")[1]);
Any ideas?
You can use the :lt() selector to achieve this. It selects the elements in a collection whose index is lower than a provided value.
var $firstAndSecond = $('#area .cArea:lt(2)');
You can use the :eq(index) selector to get directly the first and second one.
var first = ($("#area").find(".cArea:eq(0)"));
var second = ($("aArea").find(".cArea:eq(1)"));

Set focus on input field for next element of certain class name

I'm trying to set focus on the first input field in an element with class of .search-options that comes next one the page.
This is what I am using, however its not working.
$(document).ready(function() {
$('.toggle-search-options').on('click', function() {
$(this).next('.search-options *:input[type!=hidden]:first').focus();
});
});
This is very similar to this: jQuery: Find next element that is not a sibling, except that the current element doesn't match the selector you are looking for. In that case you simply have to add it to the selection:
// Outside the event handler:
var $elements = $('.search-options *:input[type!=hidden]');
// Inside the event handler:
var $elementsWithCurrentElement = $elements.add(this);
$elementsWithCurrentElement.eq($elementsWithCurrentElement.index(this) + 1).focus();
If the element you are looking for is actually a sibling, have a look at Efficient, concise way to find next matching sibling? .
I didn't understand the need for the colon in front of "input". This worked just fine for me:
$('#test input[type!="hidden"]:first')
But as an alternate solution, why not grab the first in the array of matches?
var inputs = $('#test input[type!="hidden"]');
if(inputs.length > 0) { $(inputs[0]).focus(); }

jQuery variable (select in html)

I'm new in Jquery, and I have this code:
jQuery(document).ready(function(){
var title = jQuery(".fullVisaImg").attr("inselect");
var links = jQuery(".ff_elem>option");
for(var i=0; i<links.length; i++) {
if (title == links[i].value) {
links[i].attr("selected", "selected"); // here is my problem
alert(links[i].value);
return;
}
}
});
i have a select element on my pages, and want to make one of elements selected. if I comment line with // here... all works good, and i see all my option values.
Thanks for help!
When you use [] to access an element in a jquery set, you get back the raw DOM element. So you can not use jquery methods on it directly..
You should also use .prop instead of .attr() when interacting with properties of the element
So use
links.eq(i).prop("selected", true);
replace you for loop with:
jQuery(".ff_elem").val(title);
I have created this DEMO for you. Check it out.
Although You can iterate through all your option elements and find your option element, and then do this:
links[i].prop("selected", true);
but there is no need to iterate when you can simply let your select element do this for you as I have mentioned above.
This is actually how you can select an option based on the value your options have.
$('select').val('value of the option you want to select');
so use
$(".ff_elem").val(title);
Following your code, you could use:
links.eq(i).prop("selected", true);
if your jquery version is above 1.6+ then use this
links.eq(i).prop("selected", true);
else
links.eq(i).attr("selected", "selected");
It can be much simpler. Try something like this:
jQuery(document).ready(function(){
var title = jQuery(".fullVisaImg").attr("inselect");
jQuery(".ff_elem>option[value=" + title + "]").attr("selected", "selected");
});
links is a jQuery collection. When you loop through it, you're just getting the raw element, not a jQuery wrapped version, so you can't use .attr().
Use this instead at your problem line.
$(links[i]).attr("selected", "selected");

jQuery select dropdown value based on value of other dropdown

I'm trying to get my head around jQuery, but I have trouble figuring out plain arrays vs jQuery arrays, and DOM elements vs jQuery elements.
So here's an example I try to do. The example is simple really, but I need some hand-holding :-p so I'll be verbose in my requirements hoping that the answers will be, in turn, descriptive.
I have two <select> drop-downs, with IDs #version and #target.
When I click a button, I want to select in #target the option following with the same name as the last-but-one value in #version. (the item WILL exist)
Example: #version has options: a,b,c,x. #target has options a,b,c,d,h,m.
I click the button. What should happen is:
read the last-but-one option in #version: "c"
find the option with the same name in #target: the 3rd (i.e. index is 2)
set the selected value in #target to the one after "c", i.e. "d" (the 4th, index 3)
Here's a fiddle with the example.
For the 1st step, I think I figured it out:
var latestVersion = $("#version option").get(-2).text;
//side-note: why does .text work but not .val() ? oh, .get() returns a DOM element
// so How do I get back to a jQuery element?
// $($("#version option").get(-2)).val() works but looks ugly
For step 2, I tried this:
var target = $("#target option:contains(latestVersion)");
but it doesn't work. And there's GOT to be a better way than manually iterating all the values searching for the right one.
Step 3: ??.
Using 1st step as you figured try the following:
$('#button').click(function(){
var latestVersion = $("#version option").get(-2).text;
//index of LAST-BUT-ONE
var target=$("#target option[value="+latestVersion+"]").index();
//Setting next index value
$("#target").prop("selectedIndex",target + 1);
});
http://jsfiddle.net/GpBDY/16/
.val() does not work on an option element, but it does work on a select element:
var v = $( "#version" ).val();
gives you the element selected in the dropdown #version.
The following line will not do what you want:
var target = $("#target option:contains(latestVersion)");
That is because latestVersion is treated as the value "latestValue" and not as the name of a variable. To use the value of the variable latestValue, put latestValue outside the string like:
... contains(" + latestVersion + ")...
You might be interested in the jQuery method .next() in combination with your code in step 2 to get the value of the next option element. Be aware that if there is no next element, the value will be "undefined".
You can do this using nth-child to select value of version and using that set the value of target this way:
$('#button').click(function(){
var latestVersion = $("#version option:nth-child(3)").text();
$("#target").val($('#target option[value="'+latestVersion+'"]').next().text());
});
Demo Fiddle
i am not sure i understand you are looking for, but i think that you want something like this:
$('#button').click(function(){
var arrVersion = $("#version option");
var latestVersion = $(arrVersion[arrVersion.length - 2]).val();
$("#target").val(latestVersion);
var actualSelected = parseInt($("#target").prop("selectedIndex"));
$("#target").prop("selectedIndex", actualSelected + 1);
});
http://jsfiddle.net/GpBDY/9/

Select Element From List by Index with jQuery

<form id="foo">
<input></input>
<input></input>
<input></input>
</form>
I want to do:
document.getElementById("foo").getElementsByTag("input")[1];
But in jQuery. I want to select a certain object under #foo by an index.
This is my first guess as to how to do this:
$('#foo input[1]').val("BlahBlah");
I think it would be the same in CSS too.
You could do it this way:
$('#foo input').eq(1).val("BlahBlah");
That will give you the second input. If you want the first, change the 1 to a 0. The .eq() function is 0 based.
In jQuery there are a couple of methods defined to select and use elements from a (DOM objects) list.
By using:
var list = $("#foo");
You would capture the entire #foo. If your in for simplicity you could get the children (i.e the input fields) by using var children = list.children(); But if you want something that seems a bit more like findElementsByTag, you could use var children = list.find('input'); (Which ofcourse could be a one liner, but usually you want to re-use the entire list too)
To get the first and last item of a certain list of children there are some predefined functions:
var first = children.first();
var last = children.last();
To find an -nth element you can use http://api.jquery.com/eq/ or http://api.jquery.com/nth-child-selector/
So you would get (note it works just like an array with 0-based index)
var second = children.eq(1);
If you like CSS selector style more you can also try (note the 1-based index)
var second_b = $("#foo input:nth-child(2)");
$('#foo :input').eq(1).val('BlahBlah')
You can use the eq() selector:
$('#foo input:eq(1)').val("BlahBlah");
You can use the eq selector. It receives a zero-based index:
$('#foo input:eq(1)').val('a value');
Use nth-child(n) pseudo class like this ...
$("#foo input:nth-child(0)").val("BlahBlah");
$("#foo input:nth-child(1)").val("BlahBlah");
.
.
.
$("#foo input:nth-child(n)").val("BlahBlah");
I'll say :
$($('#foo input')[1]).val("BlahBlah");

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