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  • Safe json parsing with jquery?

    - by user246114
    Hi, I am using jquery with json. My client pages generate json, which I store on my server. The clients can then fetch the json back out later, parse, and show it. Since my clients are generating the json, it may not be safe. I think jquery uses eval() internally. Is that true? Is there a way to use the native json parsers from the browsers where available, otherwise fall back to manual parsing if not? I'm new to jquery so I don't know where I'd insert my own parsing code. I'm doing something like: $.ajax({ url: 'myservlet', type: 'GET', dataType: 'json', timeout: 1000, error: function(){ alert('Error loading JSON'); }, success: function(json){ alert("It worked!: " + json.name + ", " + json.grade); } }); so in the success() method, the json object is already parsed for me. Is there a way to catch it as a raw string first? Then I can decide whether to use the native parsers or manual parsing (hoping there's a jquery plugin for that..). The articles I'm reading are all from different years, so I don't know if jquery has already abandoned eval() already for json, Thank you

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  • Mysql - wondering about scaling a twitter-like application ?

    - by user246114
    Hi, I'm developing an app that is vaguely similar to twitter, in that it allows users to follow one another. I wanted to do this using google app engine, for its scalability promises, but it's proving kind of difficult to get running for a few different reasons. I'd basically like to have a _users table, and a _followers table. Users go into the users table, follower relationships go into _followers. The problem is that each row in the users table will probably have like 100 corresponding records in the _followers table as users start following one another. So the number of rows is going to explode quickly. Using app engine, the volume [shouldn't] be a problem. If I go with mysql, and I do actually start to get some traction, how do I scale this up? Am I going to just end up moving to a distributed database in the end anyway? Should I fight it out with google app engine? I read that Twitter was using mysql, and they've run into this problem, and are now switching to cassandra. Thanks

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  • JSON.stringify() supported by IE 8?

    - by user246114
    I need to use: JSON.stringify() which should be supported by chrome, safari, and FF (I think). I think IE8 also has support for the JSON object. I think IE7 and 6 do not, so I'm doing this: <!--[if lt IE 8]> <script src="http://www.json.org/json2.js"></script> <![endif]--> so, I think this will import the external javascript only if IE6 & 7. I looked at the url where the script is hosted, they are including only if the IE version is less than 9: http://code.google.com/p/html5shiv/ <!--[if lt IE 9]> <script src="http://www.json.org/json2.js"></script> <![endif]--> so should I be including this for IE 8 too? Thanks --------------- Pointed script source to json parser js ---------------

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  • Assigning data to an <li> element?

    - by user246114
    Hi, I am generating some list items as a result of a search, and I want to attach some data to each list element from the search (possibly a bad idea to merge ui and data), but now curious about it. I am doing this: var element = $("<li>Hello</li>); element.mydata = "foo"; element.appendTo("#panelParent"); so I'm just assigning my stuff to element.mydata. My click handler reports that no such data exists for the element when clicked: $('#panelParent').delegate('li', 'click', function() { // this.mydata is undefined. }); where did it go to? I could keep the data external to the a list item element, was wondering if there's a convenient way like this to just keep it bound though? Thanks

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  • Parent key of type encoded string?

    - by user246114
    Hi, How do we create a parent key which is an encoded string? Example: class Parent { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String mEncKey; } class Child { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String mEncKey; // In the doc examples, they have Key as the type here. @Persistent @Extension(vendorName="datanucleus", key="gae.parent-pk", value="true") private String mParentEncKey; } yeah I'm not sure how to make mParentEncKey an encoded string type, because the 'key' label is already being used? I would need something like?: key="gae.parent-pk.encoded-pk" not sure - is that possible? Thanks

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  • Point one style class to another?

    - by user246114
    Hi, I have a css class like: .foo { background-color: red; } then I have a class specified for a list: .list1 li { background-color: tan; } is it possible to set one style class to just point to another? Something like: .list1 li { .foo; } not sure how to articulate that - I just want the .list li style to be whatever I define for the .foo class. Thanks

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  • Creating and parsing huge strings with javascript?

    - by user246114
    Hi, I have a simple piece of data that I'm storing on a server, as a plain string. It is kind of ridiculous, but it looks like this: name|date|grade|description|name|date|grade|description|repeat for a long time this string can be up to 1.4mb in size. The idea is that it's a bunch of student records, just strung together with a simple pipe delimeter. It's a very poor serialization method. Once this massive string is pushed to the client, it is split along the pipes into student records again, using javascript. I've been timing how long it takes to create, and split, these strings on the client side. The times are actually quite good, the slowest run I've seen on a few different machines is 0.2 seconds for 10,000 'student records', which has a final string size of ~1.4mb. I realize this is quite bizarre, just wondering if there are any inherent problems with creating and splitting such large strings using javascript? I don't know how different browsers implement their javascript engines. I've tried this on the 'major' browsers, but don't know how this would perform on earlier versions of each. Yeah looking for any comments on this, this is more for fun than anything else! Thanks

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  • Override one css class with another?

    - by user246114
    Hi, I have a list, with an li style defined. I want to replace the style of an individual element, but it doesn't seem to have any visual effect. Example: .myList li { background-color: yellow; } .foo { background-color: green; } <ul class='myList'> <li>Hello</li> </ul> When I add an item to the list, it has the .myList li style applied properly. I try now to remove all styles and apply the foo style to a single item (using jquery): $(item).removeClass(); $(item).addClass("foo"); the item does not change color to green though, but this reports the class is set to 'foo': alert($(item).attr('class')); so I guess I'm not understanding css rules here, looks like the li class definition is just overriding whatever else I do, however I want the reverse to be true, I want to override the li style definition with foo. How do we do this? Thanks

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  • Dump methods and attributes of object

    - by user246114
    Hi, I am using a third party library that provide some callbacks for a widget, but I'm not sure what the callback parameter objects are (no docs on them). Is there a way to just dump all the attributes of an object in javascript, then print them using alert(), maybe? I just want to see what methods and attributes they contain, Thanks

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  • Upload file from client machine to server - prepopulate file picker path?

    - by user246114
    Hi, I'd like to upload a file from a client machine to my server. The user would have to specify the file to upload as I understand it, using a form that looks like: <input type="file" name="datafile" size="40"> This pops up a native file picker, which is great. The problem I'm having is that it's a real pain (for most users) to go looking around their machine for the file I'm interested in. Is there a way I can initialize the file picker with a path to make it more convenient for the user? Like I know some users will be on a windows machine, so I could prepopulate the picker by already sending them to the My Documents folder for example. I don't see how this is possible, just wondering if something like that exists, Thank you

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  • Supporting twitter-like user page urls with apache/php?

    - by user246114
    Hi, I'm using php on apache with mysql. I want to let users enter a url into their browser to see a custom user page for themselves, just like twitter does. For example, they could enter urls like: www.mysite.com/johndoe www.mysite.com/janedoe and see that user's page. How could I do this with php and apache? I don't want to create a folder on disk for every user like above, I'd instead kind of like to catch the url and generate the page on the fly for them, Thanks

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  • One click handler for multiple elements?

    - by user246114
    Hi, I'm looking to add a click handler to a div. But is there a way to use a single click handler function and share it between multiple divs? Since I may have 100 divs, I don't want to create a click handler for each (they'll all practically do the same thing). The jquery example shows: $("p").click(function () { $(this).foo(); }); can we do something like: $("p").click(myClickHandler); function myClickHandler(source) { source.foo(); } ? Thanks

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  • Changing tab indicators to a view in a tab widget?

    - by user246114
    Hi, I have a layout which requires a tab widget containing two tabs. Ideally I'd like to have each tab just be a completely flat colored rectangle, side by side. Almost exactly like the buttons you see at the top of this web page titled: "Questions" | "Tags" | "Users" | "Badges" | "Unanswered" but without the whitespace in between. I'd like to have the highlighted tab have a brighter background color. Is this possible using the tab widget? I know in 1.6+ there's a method to specify a view for the tabs themselves, but can I achieve this tight look, or should I just roll my own? Thanks

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  • Sending data between activities within my app?

    - by user246114
    Hi, I have a TabActivity, and the tabs point to sub activities. Is there a way I can send a 'message' to those child activities? I just want to pass a string across, not sure if this is possible. I have some data being fetched by the parent TabActivity, and the child tabs can't do anything useful until the parent is done fetching. When fetching is complete, I'd like to pass that data to the child activities so they can do something useful with it. Notmally I'd set the data to be passed in the Intent when first creating the activity, but in this case I can't do that. Thanks

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  • Modify url in browser using javascript?

    - by user246114
    Hi, Is it possible to change the url in the user's browser without actually loading a page, using javascript? I don't think it is (could lead to unwanted behavior), I'm in a situation where this would be convenient though: I have a web app which displays reports generated by users. Layout roughly looks like: ----------------------------------------------------------- Column 1 | Column 2 ----------------------------------------------------------- Report A | Report B | Currently selected report contents here. Report C | right now the user would be looking at a url like: www.mysite.com/user123 To see the above page. When the user clicks the report names in column 1, I load the contents of that report in column 2 using ajax. This is convenient for the user, but the url in their browser remains unchanged. The users want to copy the url for a report to share with friends, so I suppose I could provide a button to generate a url for them, but it would just be more convenient for them to have it already as the url in their browser, something like: www.mysite.com/user123/reportb the alternate is to not load the contents of the report in column 2 using ajax, but rather a full page refresh. This would at least have a linkable url ready for the user in their url bar, but not as convenient as using ajax. Thanks

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  • How to give the appearance of a button with a <div>?

    - by user246114
    Hi, I'm looking at the buttons used on twitter's home page, specifically the big orange 'signup' button. I see it is defined like this: <p id="signup-btn"> <a id="signup_submit" href="/signup"> <span>Sign Up</span> </a> </p> are they just using css to give the orange button appearance (which may just be a jpg), and also using css to specify the roll-over appearance (another jpg), and finally a third state for mouse-click (another jpg) to give the impression of a real clickable button? If that's how it works, what should I look for to do the same thing? In my case I just want to make a button I guess, like: <div class='mybutton'>Hello!</div> .mybutton { bgcolor: red; bgcolor-mouseover: yellow; bgcolor-mousedown: green; } yeah something like that would be great, Thanks

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  • How to persist a cookie?

    - by user246114
    Hi, I am creating a cookie in a jsp script, which is located at: www.myproject.com/login/index.jsp if I restart the browser and navigate there, all works well, I can see the cookie persist. If I navigate to: www.myproject.com I am not seeing the cookie. Do I need to set something in the cookie path or domain to make the cookie visible to the entire [myproject.com] domain (I just want to access the cookie from whatever sub path the user may be on). I am creating the cookie like: Cookie c = new Cookie("thisisatest", "foo"); c.setMaxAge(60 * 24 * 3600); response.addCookie(c); Thanks

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  • Making buttons - <button> or <div> ?

    - by user246114
    Hi, I'm wondering what html element to use for buttons on a web page - I'd like to style my 'buttons' like twitter does. For example: http://twitter.com/twitter the "more" button at the bottom of the tweet listing - is that a <button> element, or a <div> element? I'd like to know which to use. I think for either <button> or <div> we can supply rollover states and all that stuff to make it look pleasant? Thanks

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  • sortable + draggable demo - how to get access to dropped item?

    - by user246114
    Hi, I have a sortable list. When a new item is dropped into the list (from a draggable), I'd like to get access to it to perform some operations on it. This is what I have: $("#mySortableList").sortable({ receive: function(event, ui) { alert("this is the dropped item: " + ui.item.toString()); } }).disableSelection(); so "ui.item" is the element that was dropped, but it's not the duplicated item that will now be part of my list. How do I get access to the new item that was dropped? I am using the exact demo from the jquery-ui site here: http://jqueryui.com/demos/draggable/#sortable Thanks

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  • Doing a global count of an object type (like Users), best practice?

    - by user246114
    Hi, I know keeping global counters is frowned upon in app engine. I am interested in getting some stats though, like once every 24 hours. For example, I'd like to count the number of User objects in the system once every 24 hours. So how do we do this? Do we simply keep a set of admin tool functions which do something like: SELECT FROM com.me.project.server.User; and just see what the size of the returned List is? This is kind of a bummer because the datastore would have to deserialize every single User instance to create the returned list, right? I could optimize this possibly by asking for only the keys to be returned, so the whole User object doesn't have to be deserialized. Then again, a global counter for # of users probably would create too much contention, because there probably won't be hundreds of signups a minute for the service I'm creating. How should we go about doing this? Getting my total number of users once a day is probably a pretty typical operation? Thank you

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  • Manipulate DOM before it is shown to the user?

    - by user246114
    Hi, I'm not too familiar with javascript, is there a way to manipulate the DOM before the page is displayed to the user? I'm using GWT which makes you create the page elements via javascript. This is kind of convenient, but it appears that all the javascript code is executed after the page is first shown to the user. This has the effect of showing the page as a blank white screen, then all the UI elements popping onto screen. The effect is really apparent when switching between pages. If I were using php or jsp, it looks like the page ui elements are already prerendered and the browser won't show a blank white screen before display. So is there any hook in javascript where we can manipulate the DOM before the browser clears out the contents of the last page shown? Thanks

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  • javascript call url from different domain

    - by user246114
    Hi, I want to post some data via javascript to another domain. Something like: http://www.othersite.com/submitfunnyname?name=blah The other site (othersite.com) has a REST interface that you can call (well actually this is a get example) to submit a funny name to them. Can I do this already with javascript? I'm a little confused on this - I know if that service wants to return some data, I'd need to use something like JSON-P - even though here I'm submitting some data, I guess the service will return some message structure letting me know the result, so it would have to be JSON-P, right? Thanks

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  • Ignoring files and folders in an svn-controlled folder?

    - by user246114
    Hi, I'm using svn on a mac. I'm trying to add an eclipse project to a repo. I want to ignore all .class files, and a few subfolders. I tried the following: svn propset svn:ignore *.class . property 'svn:ignore' set on '.' svn propset svn:ignore eclipse/.metadata/ . property 'svn:ignore' set on '.' so I think it's working, but then I do: svn add toplevelfolder and it still adds all .class files and folders I tried to ignore above. What's the right way to do this? Thanks

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  • Making an element draggable?

    - by user246114
    Hi, I'm trying to make an element draggable, like so: var element = $("<li id='test'>Hello</li>"); element.appendTo("#panelParent"); element.draggable("enable"); element.draggable("option", "connectToSortable", '#panelTarget'); element.draggable("option", "helper", 'clone'); element.draggable("option", "revert", 'invalid'); nothing happens when I try dragging this element. It works fine though if I embed the object in the page beforehand instead of trying to dynamically create the element. Any idea what I'm missing? For example, this works: $(function() { $("#test").draggable({ connectToSortable: '#panelTarget', helper: 'clone', revert: 'invalid' }); }); <ul> <li id='test'>Hello</li> </ul> Thanks

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