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  • Finding which element is clicked in the DOM

    - by Bhupi
    The question was asked to me in an interview. How to find which element is clicked by the user in the DOM using JQuery or Javascript or Both? NOTE: User can click on any element in the DOM whether it is an img, div or even span. If you can suggest some example then it will be very much helpful. Thanks in advance

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  • Append some HTML into the HEAD tag?

    - by Alex
    Hi! I want to add some style to head tag in html page using javascript. var h = document.getElementsByTagName('head').item(0); h.innerHTML += '<style>a{font-size:100px;}</style>'; But when I run this code in IE8 I see this error message: Could not set the innerHTML property. Invalid target element for this operation. Any ideas?

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  • AJAX Div Retrieval every 60 seconds

    - by Sam
    Hello everyone! What I would like to do is retrieve the contents of a PHP file and insert it into a div every 60 seconds, basically refreshing the dynamic div. I've come up with the following code so far, however it doesn't seem to be working. The code is just like this, nothing extra, apart from the MYSQL login. PHP to grab: <?php $time = date("m/d/Y h:i:s a", time()); mysql_query("UPDATE djs SET requesttime='{$time}' WHERE username='{$djs['username']}'") or die(mysql_error()); $request_db = mysql_query("SELECT * FROM requests WHERE haveplayed='0'") or die(mysql_error()); echo "<table style=\"border:1px solid;width:99%;margin-left:auto;margin-right:auto;\" border=\"1\">"; echo "<tr><th>Title</th><th>Artist</th><th>Dedicated To...</th></tr>"; while($request = mysql_fetch_array( $request_db )) { echo "<tr><td style=\"width:33%;padding:1px;\">"; echo $request['SongName']; echo "</td><td style=\"width:33%;\">"; echo $request['Artist']; echo "</td><td style=\"width:33%;\">"; echo $request['DedicatedTo']; echo "</td></tr>"; } echo "</table>"; ?> The original PHP code is just the same, enclosed in a div with an id attribute of 'ajax_table'. The JavaScript is: // JavaScript Document var xmlHttp_moniter function moniter() { xmlHttp_moniter = GetXmlHttpObject_parcel() if(xmlHttp_moniter == null) { alert("browser does not support HTTP Request") return } var url="ajax_table.php?random=" + Math.random() xmlHttp_moniter.onreadystatechange = stateChanged xmlHttp_moniter.open("GET",url,true) xmlHttp_moniter.send(null) } function stateChanged() { if(xmlHttp_moniter.readyState==4 || xmlHttp_moniter.readyState == "complete") { document.getElementById("ajax_table").innerHTML = xmlHttp_moniter.responseText setTimeout('ajax_table()',60000); } } function GetXmlHttpObject_parcel() { var xmlHttp_moniter=null; try { xmlHttp_moniter=new XMLHttpRequest(); } catch (e) { //Internet Explorer try { xmlHttp_moniter=new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp_moniter=new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp_moniter; } and that is on the page that is requesting the other php page.

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  • Is strict mode more performant?

    - by sje397
    Does executing javascript within a browser in 'strict mode' make it more performant, in general? Do any of the major browsers do additional optimisation or use any other techniques that will improve performance in strict mode? Edit: Since none of the major engines actually implement strict mode, I'll rephrase slightly: Is strict mode intended, amongst its other goals, to allow browsers to introduce additional optimisations or other performance enhancements?

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  • Why would one write global code inside a function definition-call pair?

    - by ssg
    I see examples where JavaScript code including jQuery and jslint use the notation below: (function(){ // do something })(); instead of: // do something I first thought this is just for local scoping, i.e. creating local variables for the code block without polluting global namespace. But I've seen instances without any local variables at all too. What am I missing here?

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  • is there a way to inject privileged methods after an object is constructed?

    - by patrickgamer
    I'm trying to write fully automated unit tests in JavaScript and I'm looking for a way to read some private variables in various JS functions. I thought I recalled a way to inject privileged members into a function/object (and found an overwhelming occurrence of "no such thing as private in JS") and yet I can't find any resources indicating how. I'm trying to read through the properties of .prototype but if there's a way, someone out here would know where to direct me faster than I'd find on my own. Thanks

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  • Coding alternative shaded rows?

    - by ming yeow
    I want alternative rows in my table to be shaded. what is the best way to do this, javascript, rails? Today, i do a simple <% num % 2%, but this is such a common operation that i think there should be a smarter way to do it

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  • Scroll DIV Horizontally with Mouse Events

    - by williamtroup
    I have a layout as follows: <div style="width: 300"> <div style="width: 300">Some Content</div> </div I want to be able to mousedown in the content DIV and be able to move it left to right, or scroll it in other words :) What would be the best way of being this? I would prefer it in JavaScript mainly :)

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  • What is the name of google chrome rss plugin?

    - by zeina
    I want to detect if the user has already installed google chrome rss plugin or not. I want to do this using javascript like this : if (navigator.plugins[rss_chrome_plugin _name]) { // do some stuff if it is installed } The problem is that I don't know the name of the plugin.Any help?

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  • Why does isNaN(123.) return false?

    - by vivekraman
    Hi, Why does the Javascript function call isNaN(123.) return false? Is this a universally acceptable number or will it cause errors downstream? I'm validating whether a value is a valid decimal using isNaN along with split. Are there cross-browser issues with isNaN? Should I use a bespoke implementation? Thanks.

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  • Passing arguments to a function?

    - by dfjhdfjhdf
    I need to learn how to pass an associative array to a function so that I could do the following within the function: function someName($argums) { if (gettype($argums) != 'array' || !array_key_exists('myOneKey', $argums) || !array_key_exists('myOtherKey', $argums)) { return false; } /*do other stuff*/ } (That's how I would do in PHP what I am looking for in JavaScript.)

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  • How to display a very long page like dzone.com?

    - by user360529
    Hi, If you ever visit dzone.com you'll notice that all the posts appear on 1 page only. When we scroll that page down, older posts will be added to the end of the page (and maybe some posts at the beginning of the page but outside the view port will be removed). My questions are: - how to know if the user scrolls down/up with javascript/jQuery? - how to know if the user is at the top of the page (they click Ctrl + Home)? Thank you.

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  • From client, force whole page validation

    - by George
    I have an ASP button for which I have set the OnClientClick property to display a javascript confirm message. However, I only want this message to be displayed AFTER all of the client side validations have passed. How can I do this? Essentially, I believe that I need to force Page level validation from the client and then, only if it passes, display the confirmation box.

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  • Gridview rows blinking

    - by Bhavi
    Hi, I tried blink the rows of ASp:Gridview. Have succeded in IE but not working in FF and safari. FF error console says "Error: gridRef.childNodes is not a function" Can anybody tell me where exactly I am wrong... The Javascript used is: '); for (var i=0; i and on my gridview_rowdatabound I have e.Row.Attributes.Add("blinkingRow", "Y");

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  • How do you find out what element type the root element is with jquery

    - by user363873
    I'm sending an ajax request that will either give me an error or a userID <?xml version="1.0" encoding="UTF-8"?> <error>1000</error> <?xml version="1.0" encoding="UTF-8"?> <userID>8</userID> how can I find out if the root element is error or userID using jquery or just javascript in general. Using the find method doesn't appear to work if what you're trying to access is the root element

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  • Bind event to a div appearing

    - by AndyC
    Can I create an event so I can execute some javascript whenever an element with a specific ID becomes visible or appears on the page? The element comes from a remote resource (so isn't in MY html code but appears on page load) and I'd like some code to run when it appears (and only if it appears, it may not appear every load). Thanks!

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  • Where can I find "canonical" sample programs that give quick refreshers for any given language? [on hold]

    - by acheong87
    Note to those close-voting this question: I understand this isn't a conventional programming question and I can agree with the reasoning that it's in the subjective domain (like best-of lists). In other ways though I think it's appropriate because, though it's not a "a specific programming problem," nor concerning "a software algorithm", nor (strictly) concerning "software tools commonly used by programmers", I think it is a "practical, answerable [problem that is] unique to the programming profession," and I think it is "based on an actual [problem I] face." I've been wanting this for some time now, because both approaches of (a) Googling for samples as I write every other line of code and (b) just winging it and seeing what errors crop up, distract me from coding efficiently. This note will be removed if the question gains popularity; this question will be deleted otherwise. I spend most of my time developing in C++, PHP, or Javascript, and every once in a while I have to do something in, say, VBA. In those times, it'd be convenient if I could just put up some sample code on a second monitor, something in between a cheat sheet (often too compact; and doesn't resemble anything that could actually compile/run), and a language reference (often too verbose, or segmented; requires extra steps to search or click through an index), so I can just glance at it and recall things, like how to loop through non-empty cells in a column. I think there's a hidden benefit to seeing formed code, that triggers the right spots in our brains to get back into a language we only need to brush up on. Similar in spirit is how http://ideone.com lets you click "Template" in any given language so you can get started without even doing a search. That template alone tells a lot, sometimes! Case-sensitivity, whitespace conventions, identifier conventions, the spelling of certain types, etc. I couldn't find a resource that pulled together such samples, so if there indeed doesn't exist such a repository, I was hoping this question would inspire professionals and experts to contribute links to the most useful sample code they've used for just this purpose: a keep-on-the-side, form-as-well-as-content, compilable/executable, reminder of a language's basic and oft-used features. Personally I am interested in seeing "samplers" for: VBA, Perl, Python, Java, C# (though for some of these autocompleters in Eclipse, Visual Studio, etc. help enough), awk, and sed. I'm tagging c++, php, and javascript because these are languages for which I'd best be able to evaluate whether proffered sample code matches what I had in mind.

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