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• Conventional Approaches for Passing Data to Back-End?

  - by Calvin

  Hi guys, I'm fairly new to web development, so please pardon the painfully newbie question that's about to follow. My computer science class group and I are developing a web application for class, which is built in Python (under Django) and uses jQuery on the front end. It's primarily an AJAX-ified application, and passing data from the backend to the front end is done through AJAX calls to specific URLs which return JSON. This is probably a stupid question, but what's the conventional approach for passing data in the opposite direction? We don't want to reload the page or anything, so is it an AJAX pass going the other way or something? Thanks in advance for your help!

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• Django, javascript and code ruse problem

  - by dragoon

  Hi, I have some sort of a design problem with my Django AJAX application. I have a template where I initialize js variable from django context variable like so: var test = "{{ test }}"; This variable is than used in a number of js functions that are needed for interface to work properly. So now I'm trying to reuse some content from this page in another page that loads it dynamically on some user interaction using jQuery.load(..), and I don't see any way how I can initialize that variable, so js functions don't work now. Is there any solution for this or may be I'm doing it wrong? Thanks.

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• Where can I find a control similar to the Firefox Rich List Box for use in my application?

  - by bsruth

  I'm trying to implement a control similar to Firefox's Rich List Box: However, I can only find the XUL implementation of this control, and I don't want to have to include a XUL processing engine in my application just to get a cool looking listbox. I've been trying to implement one on my own by customizing MFC's CListBox control, but am starting to realize it may take more time than I had intended. Before continuing to implement this control from scratch, I was wondering if anyone knew of a similar control that already exists, either commercial or open source. The main functionality I would like to have is: Small display for non selected items that expands when selected. Ability to add arbitrary controls to the expanded view. Preferably native code, but can probably use managed controls via native/managed interop with out too much extra work. Any help would be appreciated, I don't want to have to reinvent the wheel if I don't have to.

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• Fade in list of images, once all are loaded.

  - by Nathan Barry

  I have a group of images in this format: <ul id="photo-list"> <li><img src="" /></li> <li><img src="" /></li> <li><img src="" /></li> </ul> My goal is that once all the images have finished loading, then #photo-list will fade in. Also I would like to display a loading animation before the images are loaded. Any help is appreciated!

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• ASP.NET: How to assign ID to a field in DetailsView?

  - by jawonlee

  I have a master-detail page, in which I use GridView to display multiple rows of data, and DetailsView + jQuery dialog to display the details of a single records. only one DetailsView is open at a time. I need to be able to pull out a single field of the open DetailsView, for manipulation using JavaScript. Is there a way to give a unique ID to a given field in DetailsView, so I can use getElementByID? Or is there another way to accomplish what I'm trying to do? Thank you in advance.

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• How can I use javascript to convert relative href attributes into absolute paths?

  - by jhensley2

  I have a template that gets screenscraped from an outside vendor and need to include absolute paths in the navigation so the externally hosted content will properly link back to our site. Right now the page/template is driven by a global menu app written by our back end development staff... so anyone who updates our site goes in and changes the menus and their paths... Right now all of the links are linking to relative paths back to the root. For example <a href="/">Home</a> <a href="/news/">News</a> <a href="/media/">Media</a> <a href="/other/">Other</a> I need a simple way (preferably with jquery) to prepend "http://www.domain.com" to each of those links.

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• Javascript - remove part of cookie with a split('|') like array

  - by MgS

  I'm abit stuck. I'm using jQuery. I have a cookie which has the value such as : 1,something|2,somethingg|1,something We are treating it as [0] as id and [1] as name. I need to remove ONE where the id == '1' for example, this will leave the cookie like this: 1,something|2,somethingg How do I go about this, it will probally be in a loop, but not sure how to remove one of them. I have this so far: function removeItem(id){ var cookieName = 'myCookie'; var cookie = $.cookie(cookieName); if(cookie){ var cookie = cookie.split('|'); $(cookie).each(function(index){ var thisCookieData = this.split(','); if(thisCookieData[0] == id ){ } }); }

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• Drawing rectangles on a grid in a web browser

  - by Dhruv

  I would like to create an online, simple WYSIWYG drawing editor allowing people to draw rectangular shapes. I'm thinking of a grid which the lines and points can snap on to, ensuring that the lines are strictly vertical or horizontal. I will be parsing the rectangular shapes to obtain some area calculations and compute certain things. How can I achieve the drawing ability? The new canvas tag is good but people have been telling me that IE does not support it. I found some Java applets but I have never programmed in Java before. Is there a way to do this using pure javascript or jquery? Does ASP.NET help at all? Thanks.

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• set Enabled = "false" to radiobuttonlist then can not toggle enable/disable

  - by cindy

  I am able to use jquery toenable/disable radiobuttonlist based on the checkbox value. But the problem is that I want to disable radiobuttonlist at the first time. Then toggle its enable/disable by checkbox later. So I have But after I add: Enabled = "false" to my radiobuttonlist, the toggle of checkbox does not work. Here is my function to toggle : $(function() { function checkBoxClicked() { var isChecked = $(this).is(":checked"); var columnName = "rblColumn" + $(this).parent().attr("alt"); if (isChecked) { $("#" + columnName).removeAttr("disabled"); } else { $("#" + columnName).attr("disabled", "disabled"); } } //intercept any check box click event inside the #list Div $(":checkbox").click(checkBoxClicked); });

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• Find a control by String from asp.net Web service

  - by jphenow

  Well since it seems relatively difficult to send the object of a WebControl over JSON using jquery.ajax() I've decided to send the name of the control as a string because I know how to do that. Then I promptly realized that, from a web service, I don't actually know how to search for a control by ID name. Since its a service I can't seem to get Control.FindControl() to work so does anyone have ideas or suggestions? All I'm trying to do is call a databind() on my radcombobox. Thanks in advance! For any of you that knows anything about asp.net/rad controls - I'm basically updating a database and want the radcombobox to be in sync with that database again after adding something, before I autoselect what was just added. Other than databind do i have to call anything to refresh that list? Thanks again!

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• How to make Facebook like button narrower than 225px?

  - by tog22

  I'm generating a like button with Facebook's 'standard' layout for my site via https://developers.facebook.com/docs/reference/plugins/like/ . I've set its width to 200 pixels, but notice that setting it to lower than 225 pixels has no effect, and the documentation on that page indeed specifies 225px as the minimum width for the standard layout. Unfortunately I need to make it 200 pixels wide to fit my site's design. Is there any way to force it into this width? (The site's at http://gwwc2.centreforeffectivealtruism.org/ if you want to have a play with Firebug, though the like button gets generated by javascript so you'd probably have to duplicate that page and edit its source.)

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• Google Map V3 Constants as Variables

  - by Beardy

  In the example below I am trying to update the map type depending on the value of the selected option type. Unfortunately it doesn't seem to load the maptype into the google.maps.MapTypeId which is frustrating. I have tried it as a string as well as var gmapsMapType = google.maps.MapTypeId.++maptype; and I feel I am missing something here. HTML <select id="maptype" name="maptype"> <option selected="selected" value="RoadMap">Road Map</option> <option value="Satellite">Satellite</option> <option value="Hybrid">Hybrid</option> <option value="Terrain">Terrain</option> </select> JQUERY var maptype = $('#maptype>option:selected').val().toUpperCase(); var gmapsMapType = google.maps.MapTypeId.+maptype; map.setMapTypeId(gmapsMapType); Help is appreciated.

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• ajax Post data missing with tinyMCE on Firefox

  - by Freeman

  I have a problem with my form when I try to submit with ajax. I am using Malsup Form plugin for Jquery but also using tinyMCE editor. When I submit the form and check the $_POST array, there is no data from the textarea. I have tried to use the triggerSave() function but to no avail. Everything is working well in IE. // These options are common and will be used for many form submissions var options = { target: '#notice', // target element(s) to be updated with server response dataType:'html', resetForm:true, beforeSubmit: function(){tinyMCE.triggerSave(false,true); }, success:function(msg){ $('#notice').html( msg) refresh(3) } }; //prepare form $('#savetext').ajaxForm(options);

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• Dragged div change places with destination

  - by Cudos

  Hi. Maybe a bit complex to explain. I have a grid with 9 images 100 x 100 px like this (each number symbolize a picture): 1 2 3 4 5 6 7 8 9 What I want is that the user can drag and drop e.g. 9 over 1 and they change places like this: 9 2 3 4 5 6 7 8 1 Sortables from jquery UI will not work since their solution is using floats. That will "push" all the boxes to the right or left e.g.: 9 1 2 3 4 5 6 7 8 thanks in advance.

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• Creating a Better Tabbed Interface in Django

  - by ygd

  I've been trying to create a tabbed interface using Django. The current effort (which works fine) is having each template have the header hard-coded in, with the selected tab given the "selected" CSS attribute. Of course, this is a massive violation of DRY and I'm looking to remedy it. My current idea is adding a jQuery script to the page that looks at all the tabs and sets one to "selected" if it's text matches the beginning of the title for the page. Is there a better way to do this without using JavaScript and just pure CSS?

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• Returning the html from .ajax call

  - by coffeeaddict

  I'm getting undefined for some reason when I try to return the html via the callback function: function getDataFromUrl(urlWithContent) { // jQuery async request $.ajax( { url: urlWithContent, dataType: "html", success: function(data) { return $('.result').html(data); }, error: function(e) { alert('Error: ' + e); } }); } I know I'm getting data back, I see it in firebug in the response and also when I alert out the data, I see the entire page content come up in the alert box. When I call my function, I am doing the following: var divContent = getDataFromUrl(dialogDiv.attr("href")); if(divContent) dialogDiv.innerHTML = divContent; when I alert out the divContent (before the if statement) I'm getting undefined. Maybe I'm just going about this wrong on how I'm returning back the data? I also tried just return data; same thing, I get undefined after the call to this method when set to my variable.

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• My app crashes on Iphone SDK 3.2

  - by Mladen

  Hi Guys, My app worked ok on iPhone SDK 3.1. However, when I try to run it in 3.2 simulator, I get the following error and it crashes: bool _WebTryThreadLock(bool), 0x5148280: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... Program received signal: “EXC_BAD_ACCESS”. When I debug it, it leads me to this peace of code: - (void)LoginViewToCheckView:(id)sender { CheckViewController *tempTestController = [[CheckViewController alloc] initWithStyle:UITableViewStyleGrouped]; [tempTestController setDelegate:self]; [self setCheckViewController: tempTestController]; [tempTestController release]; [navigationController pushViewController:checkViewController animated:YES];} Other thing worth mentioning is maybe that I am calling this function from a separate thread. Any ideas what could be wrong?

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• Pass javascript array to php by using curly braces key name

  - by user7031

  My js code: $(function(){ var arr = new Array('jj', 'kk', 'oo'); $.post('test12.php', {'arr[]': arr}, function(data){ alert(data); }); }); PHP code: <?php echo print_r($_POST['arr']); The thing is,$.post receive a key named 'arr[]',it should be used in PHP as 'arr[]' instead of 'arr',but '$_POST['arr[]']' doesn't work,'arr' works.Which seems that Jquery might do something with curly braces '[]' before sending something to PHP. Secondly,when I remove the single quotas around 'arr[]',PHP can not receive anything by using $_POST['arr'];,I don't know why? Doing this task in a traditional way with no curly braces: $.post('test12.php', {arr: arr}, function(data){ alert(data); }); It works fine. So when sending javascript array to PHP,why bothering using single quote and curly braces like 'arr[]' instead of using a concise way like arr:arr My return result is Array( [0]=>jj [1]=>kk [2]=>oo ) 1 Notice there is a 1 under the array,why?

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• Django: How do I go about changing my simple app to use Ajax?

  - by swisstony

  I currently have a web page where the user enters some data and then clicks a submit button. I process the data in views.py and then use the same Django template to return and display the original data and the results. What I would like to do is try to give it a bit more of a modern look and feel. You know the sort of thing, the page doesn't refresh but displays a spinning disk until the results are displayed. I assume this means using Ajax? How difficult is it to modify a simple app like this to use Ajax? What is involved? What are the best tools to use? JQuery?

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• To trigger everytime with .click()?

  - by Dejan.S

  I tried to have a .click() on a <a> to find out it wont trigger every time I click, what it suppose to do is open a dialog. That is not the only problem I would need to pass a value to my jquery to. I just cant figure this one out. I need it to be a <a> because it's gone be in a dropdown menu. Do you got any suggestions? this is the code I use so far $(document).ready(function() { $('a').click(function() { var first = "<iframe style='width: 100%; height: 100%;' src='" + need to put value here + "'</iframe>'"; $('.iframe').html(first); $('#dialog').dialog({ bgiframe: true, modal: true, height: 600, width: 1000 }); }); }); thanks guys

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• Can't set element ID in JavaScript, it's always undefined

  - by Dylaan Alith

  Hi, I want to have a function that generates ID's on the fly for a given jquery object, if it doesn't have one already. These ID's should then be used in future requests. I came up with the code below, but it doesn't work. The ID's are never set. The commented out alert statement below always return undefined. I always pass code like $(this) or $(options.el) as a parameter to substitute 'el'. Initially, the elements do not have explicitly ID set in HTML. Any help would be appreciated, here's the code: getElementId: function(el) { if(undefined == el.attr('id')) { el.attr('id',"anim-"+Math.random().toString().substr(2)); } // alert(el.attr('id')); return el.attr('id'); },

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• Need advice with HTML table

  - by misha-moroshko

  I would like to code an HTML table with messages like this: The table will contain messages that will spread over first N columns (N may change). Lets call these N columns, the message area. Each message is located on X contiguous cells in the message area. X may also change. Each message has a name that contains words separated with underscores. How would you recommend to code this table in Javascript/jQuery such that: It would be easy to define a message (start cell, end cell, color, name) The name will break only after underscores (rather than in the middle of the word)

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• failed to load resource

  - by Jason94

  Im trying to set up a simple mp3 player: <script language="javascript"> $(document).ready(function() { $('a.media').media( { width: 300, height: 20 } ); }); </script> and then <a class="media" href="piano.mp3">piano</a> But i get the following error: Failed to load resource I have followed the tutorial at http://jquery.malsup.com/media/audio.html, and if i click to view source and clikc on piano.mp3 chrome opens up its built in media player and plays the song, so the link and location is correct... Anyone got a clue?

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• How can I implement lazy loading on a page with 500+ images?

  - by Fedor

  I basically have a booking engine unit results page which must show 40 units and per each unit there's 1 large image of the first thumbnail and an X number of accompanying thumbnail images. I've been using the jquery lazy load plugin, but it's not thorough enough ( I'm invoking it on DOM Ready ), plus it doesn't really work in IE ( 50% of the clients use IE so it's a big issue ). What I think I really need to do is not really spit out the image but a fake element such as a span, and possibly modify my code such that if the user views the span, render it into an image element. <span src="/images/foo.gif"> The booking engine relies on JS so I think I might be forced to just rely on ajaxifying all the thumbnails and have event handlers on window scroll, etc in order for the page to be "usable" and load at an average time ( 2-3 seconds instead of 5-30s on high speed DSL/Cable ). I'd appreciate any examples or ideas.

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• How do I avoid nesting forms when offering inline editing of lists with checkboxes for mass updates.

  - by adam

  A lot of sites offer the ability to edit lists of items inline as well as allowing multiple items to be selected via checkboxes and have an action performed all at once e.g. delete, mark as spam etc. But how do you implement this without violating html rules. I need one form for the checkboxes with individual submit_tags for the mass actions. But after a user clicks on an item in the list, another form via Ajax will be inserted within the checkbox form. How do I avoid doing this? I'm using rails and jQuery.

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