    $( this ).find( &#39;li.target&#39; ).css(&quot;border&quot;, &quot;3px double red&quot;);

or

    $( this ).children( &#39;li.target&#39; ).css(&quot;border&quot;, &quot;3px double red&quot;);

Use [`children`][1] for immediate descendants, or [`find`][2] for deeper elements.



  [1]: http://api.jquery.com/children/
  [2]: http://api.jquery.com/find/

I use this to get the Parent, similarly for child 

    $( this ).children( &#39;li.target&#39; ).css(&quot;border&quot;, &quot;3px double red&quot;);

Good Luck

How can I make a div fill up the remaining width?

    &lt;div id=&quot;Main&quot; style=&quot;width: 500px;&quot;&gt;
        &lt;div id=&quot;div1&quot; style=&quot;width: 100px;&quot;&gt;&lt;/div&gt;
        &lt;div id=&quot;div2&quot;&gt;&lt;/div&gt;
        &lt;div id=&quot;div3&quot; style=&quot;width: 100px; float: right;&quot;&gt;&lt;/div&gt;
    &lt;/div&gt;

How can I get `div2` to fill up the remainder?

Make a div fill up the remaining width

Often I need to check if some value is blank and write that &quot;No data present&quot; like that:

    @user.address.blank? ? &quot;We don&#39;t know user&#39;s address&quot; : @user.address

And when we have got about 20-30 fields that we need to process this way it becomes ugly.

What I&#39;ve made is extended String class with `or` method

    class String
      def or(what)
        self.strip.blank? ? what : self
      end
    end

    @user.address.or(&quot;We don&#39;t know user&#39;s address&quot;)

Now it is looking better. But it is still raw and rough

How it would be better to solve my problem. Maybe it would be better to extend `ActiveSupport class` or use helper method or mixins or anything else. What ruby idealogy, your experience and best practices can tell to me.

If string is empty then return some default value

I know can I select an element this way:


    $(&quot;ul.topnav &gt; li.target&quot;).css(&quot;border&quot;, &quot;3px double red&quot;);

but how can I do something like:

    $(this &gt; li.target).css(&quot;border&quot;, &quot;3px double red&quot;);

How to select an element inside &quot;this&quot; in jQuery?

I know can I select an element this way:
<pre><code class="hljs language-javascript">$("ul.topnav > li.target").css("border", "3px double red");
</code></pre>
but how can I do something like:
<pre><code class="hljs language-javascript">$(this > li.target).css("border", "3px double red");
</code></pre>

jQuery 1.5 brings the new Deferred object and the attached methods [`.when`][1], [`.Deferred`][2] and [`._Deferred`][3].

For those who haven&#39;t used `.Deferred` before, I&#39;ve annotated the [source for it][7].

What are the possible usages of these new methods, how do we go about fitting them into patterns?

I have already read the [API][2] and the [source][6], so I know what it does. My question is how can we use these new features in everyday code?

I have a simple [example][4] of a buffer class that calls AJAX requests in order. (Next one starts after the previous one finishes).

    /* Class: Buffer
     *  methods: append
     *
     *  Constructor: takes a function which will be the task handler to be called
     *
     *  .append appends a task to the buffer. Buffer will only call a task when the 
     *  previous task has finished
     */
    var Buffer = function(handler) {
        var tasks = [];
        // empty resolved deferred object
        var deferred = $.when();
    
        // handle the next object
        function handleNextTask() {
            // if the current deferred task has resolved and there are more tasks
            if (deferred.isResolved() &amp;&amp; tasks.length &gt; 0) {
                // grab a task
                var task = tasks.shift();
                // set the deferred to be deferred returned from the handler
                deferred = handler(task);
                // if its not a deferred object then set it to be an empty deferred object
                if (!(deferred &amp;&amp; deferred.promise)) {
                    deferred = $.when();
                }
                // if we have tasks left then handle the next one when the current one 
                // is done.
                if (tasks.length &gt; 0) {
                    deferred.done(handleNextTask);
                }
            }
        }
    
        // appends a task.
        this.append = function(task) {
            // add to the array
            tasks.push(task);
            // handle the next task
            handleNextTask();
        };
    };

I&#39;m looking for demonstrations and possible uses of `.Deferred` and `.when`.

It would also be lovely to see examples of `._Deferred`. 

Linking to the new [`jQuery.ajax`][5] source for examples is cheating.

I am particularly interested in what techniques are available when we abstract away whether an operation is synchronously or asynchronously done.

  [1]: http://api.jquery.com/jQuery.when/
  [2]: http://api.jquery.com/category/deferred-object/
  [3]: https://github.com/jquery/jquery/blob/1.5/src/core.js#L808
  [4]: http://jsfiddle.net/Raynos/Vg5sY/9/
  [5]: https://github.com/jquery/jquery/blob/1.5/src/ajax.js
  [6]: https://github.com/jquery/jquery/blob/1.5/src/core.js#L892
  [7]: http://jsfiddle.net/Raynos/Hufjr/

How can jQuery deferred be used?

I have a set of dynamically generated dropdown boxes on my page. basically I clone them using jQuery. now I want to capture the value selected on each dropdown on change event.

I tried something like this which did not work.

    $(&#39;._someDropDown&#39;).live(&#39;change&#39;, function(e) {
                //debugger;
                var v = $(this);
                alert($(this + &#39;:selected&#39;).val());
                alert($(this).val());
            });

How do I get it done?


Get current value selected in dropdown using jQuery

I have an application that requires data be loaded in a certain order: the root URL, then the schemas, then finally initialize the application with the schemas and urls for the various data objects.  As the user navigates the application, data objects are loaded, validated against the schema, and displayed.  As the user CRUDs the data, the schemas provide first-pass validation.

I&#39;m having a problem with initialization.  I use an Ajax call to fetch the root object, $.when(), and then create an array of promises, one for each schema object.  That works.  I see the fetch in the console.

I then see the fetch for all the schemas, so each $.ajax() call works.  fetchschemas() does indeed return an array of promises.

However, that final when() clause never fires and the word &quot;DONE&quot; never appears on the console. The source code to jquery-1.5 seems to imply that &quot;null&quot; is acceptable as an object to pass to $.when.apply(), as when() will build an internal Deferred() object to manage the list if no object is passed in.

This worked using Futures.js.  How should an array of jQuery Deferreds be managed, if not like this?

        var fetch_schemas, fetch_root;

        fetch_schemas = function(schema_urls) {
            var fetch_one = function(url) {
                return $.ajax({
                    url: url,
                    data: {},
                    contentType: &quot;application/json; charset=utf-8&quot;,
                    dataType: &quot;json&quot;
                });
            };

            return $.map(schema_urls, fetch_one);
        };

        fetch_root = function() {
            return $.ajax({
                url: BASE_URL,
                data: {},
                contentType: &quot;application/json; charset=utf-8&quot;,
                dataType: &quot;json&quot;
            });
        };

        $.when(fetch_root()).then(function(data) {
            var promises = fetch_schemas(data.schema_urls);
            $.when.apply(null, promises).then(function(schemas) {
                console.log(&quot;DONE&quot;, this, schemas);
            });
        });


How do you work with an array of jQuery Deferreds?

    &lt;div id=&quot;tagscloud&quot;&gt;
           &lt;span&gt;&lt;/span&gt;
    &lt;/div&gt;

How would I do to add some text within the span like code below ?

 `&lt;span&gt;**tag cloud**&lt;/span&gt;`

**Edit**:
actually the span has an id

    &lt;div id=&quot;tagscloud&quot;&gt; &lt;span id=&quot;WebPartCaptionWPQ2&quot;&gt;&lt;/span&gt; &lt;/div&gt;

jQuery add text to span within a div

I have an HTML document with images in a grid format using `&lt;ul&gt;&lt;li&gt;&lt;img...`. The browser window has both vertical &amp; horizontal scrolling. 

**Question:** 
When I click on an image `&lt;img&gt;`, how then do I get the whole document to scroll to a position where the image I just clicked on is `top:20px; left:20px` ?

I&#39;ve had a browse on here for similar posts...although I&#39;m quite new to JavaScript, and want to understand how this is achieved for myself.

Content Type	Original Author	Original Content on Stackoverflow
Question	deb	View Question on Stackoverflow
Solution 1 - Jquery	hookedonwinter	View Answer on Stackoverflow
Solution 2 - Jquery	mchinta	View Answer on Stackoverflow

How to select an element inside "this" in jQuery?

Jquery Problem Overview

Jquery Solutions

Solution 1 - Jquery

Solution 2 - Jquery

If string is empty then return some default value

Make a div fill up the remaining width

Attributions