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js trigger click on a based on children element id

I want to trigger the click on a tag which has div with id='a'.
$(document).ready(function() {
$("#chat_list_content a:has(div[id='a'])").click();
//$("#chat_list_content a:has(div[id='a'])").trigger("click");
$('#chat_list_content a').click(function() {
alert('you are here');
})
})
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div id="chat_list_content">
<a href="#">
<div id="a">A</div>
</a>
<a href="#">
<div id="b">B</div>
</a>
</div>
Click should happen automatically and output alert box. But, there is no respond from the code.
Thanks in advance.

When you call $("#chat_list_content a:has(div[id='a'])").click(), the custom click handler is not yet described yet. That means it doesn't do anything. You just need to move the click trigger below the click function definition:
$(document).ready(function() {
//$("#chat_list_content a:has(div[id='a'])").trigger("click");
$("#chat_list_content a").click(function() {
alert("you are here");
});
// Make sure to add this after the click handler definition above
$("#chat_list_content a:has(div[id='a'])").click();
});
working sandbox: https://codesandbox.io/s/exciting-gagarin-t55er

There is no need to use :has() here at all, you can simply use Attribute Equals Selector [name="value"] to achieve what you are looking for.
$(document).ready(function(){
$('#chat_list_content a').click(function(){
alert('you are here at '+ $(this).index());
});
$('#chat_list_content a div[id=a]').click();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="chat_list_content">
<a href="#">
<div id="a">A</div>
</a>
<a href="#">
<div id="b">B</div>
</a>
</div>

Push value to jquery array

Simply put, trying to push simple answer values to a jquery array.
HTML
<div class="answer-A">
<a href="#question2" value="A">
<p style="color: white;">THOMAS EDISON</p>
</a>
</div>
<div class="answer-B">
<a href="#question2" value="B">
<p style="color: white;">ALBERT EINSTEIN</p>
</a>
</div>
<div class="answer-C">
<a href="#question2" value="C">
<p style="color: white;">NELSON MANDELA</p>
</a>
</div>
Jquery
var finalAnswers = [''];
$(document).ready(function () {
$('.answer-A').finalAnswers.push();
console.log(finalAnswers);
});
Probably shouldn't be using value - there's probably a much easier way?

If I understood correctly your question, I created this fiddle with an approach to accomplish your task:
https://jsfiddle.net/mrlew/hvr9ysq6/
html:
<div class="answer-A">
<a href="#" data-value="A">
<p style="color: white;">THOMAS EDISON</p>
</a>
</div>
<div class="answer-B">
<a href="#" data-value="B">
<p style="color: white;">ALBERT EINSTEIN</p>
</a>
</div>
<div class="answer-C">
<a href="#" data-value="C">
<p style="color: white;">NELSON MANDELA</p>
</a>
</div>
js:
var finalAnswers = [];
$(document).ready(function () {
$("a[data-value]").on("click", function(e) {
var value = $(this).attr('data-value');
finalAnswers.push(value);
alert("Answers so far: " + finalAnswers.join(","));
e.preventDefault();
});
});

Here is example for your comment about how you want to push the value that user click.
var finalAnswers = [];
$(".answer-A, .answer-B, answer-C").click(function(){
var value = $(this).children("a").attr("value");
finalAnswers.push(value)
});

Use a selector that matches divs with class that start with answer and their anchor children
div[class^="answer-"] a
Iterate through these elements and get their value attribute. Like this:
var finalAnswers = [''];
$(document).ready(function () {
$('div[class^="answer-"] a').each(function(i,v){
finalAnswers.push($(v).attr("value"));
});
console.log(finalAnswers);
});
Fiddle
https://jsfiddle.net/1gmn1w1b/

Jquery get closest a href attribute

I have the below markup and I am trying to get the href but always getting undefined. Any help is appreciated.
<div class="wrapper">
<span class="mixSpanLeft" style="background-image: url(http://cdn.wallpapersafari.com/29/20/3HE5Mx.jpg)">
</span>
<div class="mixDivRight">
<p class="bottomP"><button>Select</button><p>
</div>
</div>
$container = $('.wrapper');
$container.on('click', '.bottomP', function (event) {
console.log($(this).closest('a').attr('href'));
});

Assuming that you fix the class/ID issue noted in the comments by Mohammad you could use:
$('.wrapper').on('click', '.bottomP', function (event) {
console.log($(this).closest('.wrapper').find('a').attr('href'));
});
$('.wrapper').on('click', '.bottomP', function (event) {
console.log($(this).closest('.wrapper').find('a').attr('href'));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<span class="mixSpanLeft" style="background-image: url(http://cdn.wallpapersafari.com/29/20/3HE5Mx.jpg)">
</span>
<div class="mixDivRight">
<p class="bottomP"><button>Select</button><p>
</div>
</div>

Aside from what Mohammad mentioned about needing to use .wrapper instead of #wrapper. I recommend using .find() instead of .closest(). .closest() does not work in IE, but that might not be an issue for you. you can also do something like this:
$("div.wrapper").on('click', '.bottomP', function () {
console.log($("div.wrapper a:first").attr('href'));
});
This will grab the first <a> tag inside the wrapper div.

Jquery - How to prepend elemend before text in div?

I have a problem with my code in Jquery. I need to put one element before text in div. But it stays on same place. Can you help me ? Thank you very much.
Jquery:
$('.content_wrap img').each(function(){
if($(this).nextAll('.darkblue').length !== 0){
$('.darkblue').next('<div>').prepend($(this));
}
});
HTML:
<h2>
<img class="catIcon" alt="Software Maintenance Agreements" src="http://www.example.com/storage/images/article/21-80-3.jpg" style="padding-right: 10px;"> <!-- this is image i want to move before text -->
<a class="darkblue underline ui-link" href="http://www.example.com/gb/en/2099_software-maintenance-agreements-sma.html?do=article">Software Maintenance Agreements (SMA)</a>
</h2>
<div>
Software Maintenance A...roups at a fixed rate. <!-- element should appear before text -->
<a class="small ui-link" href="http://www.example.com/gb/en/2099_software-maintenance-agreements-sma.html?do=article">[more..]</a>
</div>

Try
$('.content_wrap img').each(function () {
$(this).prependTo($(this).parent().next())
});
Demo: Fiddle
If you want to check whether the next element has the class darkblue then
$('.content_wrap img').each(function () {
var $this = $(this);
if ($this.next().hasClass('darkblue')) {
$this.prependTo($this.parent().next())
}
});
Demo: Fiddle

why not just try
$("div").prepend($this)
if that's the only div in your file.

You need to find the parent of nextblue (the h2) then find the next div:
$('.content_wrap img').each(function(){
if($(this).nextAll('.darkblue').length !== 0){
$('.darkblue').closest("h2").next('div').prepend($(this));
}
});

You need to find it's parent's next div not it's next div:
$('.content_wrap img').each(function(){
if($(this).nextAll('.darkblue').length !== 0){
$('.darkblue').parent().next().prepend($(this));
}
});

working Solution: http://jsfiddle.net/avi_sagi/P6LhK/
The <h2> must be inside <a> tag. I checked with the Updated code its fine
<div class="content_wrap">
<img class="catIcon" alt="Software Maintenance Agreements" src="http://www.example.com/storage/images/article/21-80-3.jpg" style="padding-right: 10px;">
<a class="darkblue underline ui-link" href="http://www.example.com/gb/en/2099_software-maintenance-agreements-sma.html?do=article">
<h2>Software Maintenance Agreements (SMA)</h2>
</a>
<div>Software Maintenance A...roups at a fixed rate.
<a class="small ui-link" href="http://www.example.com/gb/en/2099_software-maintenance-agreements-sma.html?do=article">[more..]</a>
</div>

try this
$('.darkblue').parent("h2").next("div").prepend($(this));

multiple div using the same class open at once

I am using the javascript function for multiple hide show divs in custom tumblr theme.. my The problem is as the class name is same, if i click on a single div, by default all the div gets show or hide.
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$(document).ready(function() {
$(".toggleme").click(function () {
$(".toparea3").slideToggle("slow");
return false;
});
});
</script>
<a class="toggleme" href="#"><img src="http://www.abc.com/images/share.png"></a>
<div class="toparea3" style="display:none;">
<div class="share-bar clearfix" style=" margin-top:3px;margin-left: -2px;width: 380px;height: 50px;">
<div class="share-bar-buttons">
<div class="share-bar-facebook">
<iframe src="http://www.facebook.com/plugins/like.php?href={URLEncodedPermalink}&layout=button_count&show_faces=false&width=110&action=like&font=lucida+grande&colorscheme=light&height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:110px; height:21px;" allowTransparency="true"></iframe>
</div>
</div>
<div style="margin-left:80px;margin-top: 15px;" class="share-bar-twitter">
<a href="http://twitter.com/share" class="twitter-share-button"
data-url="{Permalink}"
{block:Twitter}data-via="{TwitterUsername}"{/block:Twitter}
data-related="stylehatch:Premium Tumblr Themes by #newezra"></a>
</div>
<div style="float: right;margin-top:-25px;" class="share-bar-shorturl">
<div class="linktumb">
http://www.tumblr.com/xdrs2sf
</div>
</div>
</div>
</div>

Assuming you have multiple "toggleme" buttons, if they're all in the format where you have a toggleme button and then a toparea3, you could do something like this:
$('.toggleme').click(function(){
$(this).next().slideToggle('slow');
return false;
});
The "next" function gets the next element in the DOM, which is the element you want to expand.

Edit: (nevermind the .children)
try using the .closest selector, or the .next selector someone else suggested. Just remember to provide the selector .toparea3 to make sure that only that class opens, not just any closest/next element.
$(document).ready(function() {
$(".toggleme").click(function () {
$(this).closest(".toparea3").slideToggle("slow");
return false;
});
});

I would recommend the following:
Place the 'a' and the corresponding 'div' in a parent 'div'. Something like this:
<div>
<a class='toggleMe' />
<div class='toparea3 />
</div>
Then you can update your inner selector to be:
$('.toggleMe').click(function(evt){
evt.preventDefault();
var parent = $(this).closest('div');
$(".toparea3", parent).slideToggle("slow");
}

My Recommendation is to give the div an id, and make the anchor element's href point to it:
<script>
$(document).ready(function() {
$(".toggleme").click(function () {
$(this.hash).slideToggle("slow");
return false;
});
});
</script>
<a class="toggleme" href="#toparea3_1"><img src="http://www.abc.com/images/share.png"></a>
<div id="toparea3_1" class="toparea3" style="display:none;"></div>
This since the hash is given in the form #toparea3_1 that is a valid jQuery selector that selects on ID, and can be used directly.