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  • Checking for attachments in JavaScript

    - by Sanjay
    Prior to submitting a form, I would like to check if a file has been attached and pop up a warning message saying that a file needs to be attached if it hasn't been. I was wondering how to accomplish this using JavaScript or Prototype or JQuery etc?

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  • Inserting a Variable String into the javascript prototype expression

    - by webzide
    Dear experts, Pardon me for giving you a confusing title on this problem. I'm really confused and i don't know how to put it in other words. So here is what I what to accomplish. I am making a Custom Javascript Object to store data. I have automated this process and inserted each instance of the object into an array. I am making a loop statement to invoke the unique property value of each instance of the object. When I want to use an expression, the property name of the object would be variable since i don't know which one it is. Basically I need to incorporate a string value into the prototype expression. e.g document.getElementById('text').style."fontsize"=value; since I cannot do this directly, i thought possibly I could use the eval function: eval('document.getElementById("text").style.' + buttons[i].cssvalue + '="39px";'); but this still doesn't work. Can this be fixed or ss there an alternative way to accomplish this? If there are some unclear stuff, please point out and I will try to elaborate. Thanks in advance.

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  • Javascript conversion, from Prototype to jQuery

    - by moshimoshi
    Hi, I would like to update the following javascript code based on Prototype framework to jQuery framework: Event.observe(window, 'load', function() { $$('.piece').each(function(item) { new Draggable(item, { revert: true } ); }); $$('.cell').each(function(item) { Droppables.add(item, { accept: 'piece', onDrop: function(piece, cell) { cell.descendants().each(function(item) { item.remove(); } ); piece.remove(); piece.setStyle({ 'top': null, 'left': null }); new Draggable(piece, { revert: true }); cell.appendChild(piece); } }); }); }); The first part of the script is easy to convert: $(function() { $('.piece').draggable( { evert: true } ); $('.cell').droppable( { /* But here, it's more difficult. Right? ;) ... */ } }); }); Have you got an idea? Any part of code is welcome. Thanks a lot.

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  • Rails: link_to_remote prototype helper with :with option

    - by Syed Aslam
    I am trying to grab the current value of a drop down list with Prototype and passing it along using :with like this <%= link_to_remote "today", :update => "choices", :url => { :action => "check_availability" } , :with => "'practitioner='+$F('practitioner')&'clinic='+$F('clinic')&'when=today'", :loading => "spinner.show(); $('submit').disable();", :complete => "spinner.hide(); $('submit').enable();" %> However, this is not working as expected. I am unable to access parameters in the controller as the link_to_remote helper is sending parameters like this: Parameters: {"succ"=>"function () {\n return this + 1;\n}", "action"=>"check_availability", "round"=>"function () {\n return __method.apply(null, [this].concat($A(arguments)));\n}", "ceil"=>"function () {\n return __method.apply(null, [this].concat($A(arguments)));\n}", "floor"=>"function () {\n return __method.apply(null, [this].concat($A(arguments)));\n}", "times"=>"function (iterator, context) {\n $R(0, this, true).each(iterator, context);\n return this;\n}", "toPaddedString"=>"function (length, radix) {\n var string = this.toString(radix || 10);\n return \"0\".times(length - string.length) + string;\n}", "toColorPart"=>"function () {\n return this.toPaddedString(2, 16);\n}", "abs"=>"function () {\n return __method.apply(null, [this].concat($A(arguments)));\n}", "controller"=>"main"} Where am I going wrong? Is there a better way to do this?

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  • typedef a functions prototype

    - by bitmask
    I have a series of functions with the same prototype, say int func1(int a, int b) { // ... } int func2(int a, int b) { // ... } // ... Now, I want to simplify their definition and declaration. Of course I could use a macro like that: #define SP_FUNC(name) int name(int a, int b) But I'd like to keep it in C, so I tried to use the storage specifier typedef for this: typedef int SpFunc(int a, int b); This seems to work fine for the declaration: SpFunc func1; // compiles but not for the definition: SpFunc func1 { // ... } which gives me the following error: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token Is there a way to do this correctly or is it impossible? To my understanding of C this should work, but it doesn't. Why? Note, gcc understands what I am trying to do, because, if I write SpFunc func1 = { /* ... */ } it tells me error: function 'func1' is initialized like a variable Which means that gcc understands that SpFunc is a function type.

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  • Event triggering inside prototype

    - by shivesh
    When I try to call "Test" function I get an error. How to fix that? (no jquery!) Browser:firefox error: TypeError: this.Test is not a function <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <title>Untitled Document</title> <script type="text/javascript"> MyClass = function(){ } MyClass.prototype = { Init: function(){ var txt = document.getElementById("text"); if (txt.addEventListener) { txt.addEventListener("keyup", this.Foo, true) } }, Foo: function(){ this.Test(); }, Test: function(){ alert('OK'); } } window.onload = function(){ obj = new MyClass; obj.Init(); } </script> </head> <body> <textarea id="text" rows="10"> </textarea> </div> </body>

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  • Prototypejs .evalJSON not returning object

    - by Pselus
    I have this JSON (which validates according to JSONLint): [ { "BugCount":"2", "BugTitle":"C:\\INETPUB\\WWWROOT\\CLUBREADY2\\TRAINERS\\../Connections/LTC.asp", "ErrLine":"141", "BugID":"702" }, { "BugCount":"1", "BugTitle":"/admin/ajax_logagreementsig.asp", "ErrLine":"0", "BugID":"1322" }, ] However, when I run data = json.evalJSON on it I get some problems. If I run .evalJSON(true) (to sanitize) an error happens within prototype saying "json" is undefined. The same happens if I do .evalJSON(). If I do .evalJSON with no parenthesis, then data is just an empty object and no error happens. Is there something wrong with my JSON?

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  • CSS selector for grouped iterations

    - by snaken
    Hi, I have a number of elements that i want to loop through as groups. Consider this HTML: <input class="matching match-1" /> <input class="matching match-1" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-3" /> <input class="matching match-3" /> // etc I want a CSS selector that would allow me to loop through these as groups so there would be - using this example - 3 iterations of the loop (one for match-1, one for match-2 and one for match-3). The 1,2,3 etc is a variable used for grouping but this is not fixed so it cannot rely on hard coding of these values. Is this even possible? I'll be using jQuery or prototype not that that should matter really. Thanks

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  • CSS selector for the last occurrence of a class on a page

    - by snaken
    Is there a CSS selector for the last occurrence of a class on a page? Say i have this HTML <dd> <span> <a class="required" id="forename">foo</a> </span> </dd> <dd> <span> <a class="required" id="surname">bar</a> </span> </dd> Is there a CSS selector that would return the a tag with the ID of surname. Something like .required:last maybe? Will be using Prototype if that matters?

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  • Where are my $_FILES? Ajax Uploading

    - by Richard Testani
    I've built a form to upload images, and processed with Prototype/PHP. $('image_upload').observe('submit', function() { var params = $H(); params.set('name', $('image_title').value); params.set('from', $('from_who').value); params.set('upload_file', $('upload_file').value); new Ajax.Request('/files/upload_process.php', { method:'post', parameters: params, onSuccess: function(r) { $('uploadbox').update('<img src="/images/interface/thankyou.png" />'); } }) }); The form itself sends the data to the server, but when I try to output print_r($_FILES['upload_file']); nothing appears, not even an empty array. If I output print_r($_POST), the parameters are sent properly, but only the file name of the image. So it seems the files themselves are not being sent along. How do I handle this? Thanks Rich

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  • Prototypes Object.extend with multiple objects that contain there own functions.

    - by erickreutz
    How would I achieve something along the lines of this.. var Persistence = new Lawnchair('name'); Object.extend(Lawnchair.prototype, { UserDefaults: { setup: function(callback) { // "save" is a native Lawnchair function that doesnt //work because // "this" does not reference "Lawnchair" // but if I am one level up it does. Say if I defined // a function called UserDefaults_setup() it would work // but UserDefaults.setup does not work. this.save({key: 'key', value: 'value'}); // What is this functions scope? // How do I access Lawnchairs "this" } }, Schedule: { refresh: function(callback) { } } }); //this get called but doesnt work. Persistence.UserDefaults.setup();

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  • When should I observe javascript events on window vs. document vs. document.body?

    - by brahn
    I'm using prototype.js for my web app, and I have everything running on chrome, safari, and firefox. I am now working on IE8 compatibility. As I've been debugging in IE, I've noticed that there are javascript events for which I have previously set an observer on the window, e.g. Event.observe(window, eventType, function () {...}); (where eventType might be "dom:loaded", "keypress", etc.) and it works just fine in Chrome/Safari/Firefox. However, in IE the observer never fires. In at least some cases I could get this to work on IE by instead placing the observer on something other than window, e.g. document (in the case of "dom:loaded") or document.body (in the case of "keypress"). However, this is all trial-and-error. Is there some more systematic way to determine where to place these observers such that the results will be cross-browser compatible? Thanks!

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  • Can Ruby on Rails handle AJAX Response by Static Javascript code? by using RJS?

    - by Jian Lin
    So it looks like on RoR, when Ajax (using form_remote_tag) returns a success code, Javascript is also returned to handle the visual effects. (this is the RJS mechanism) using Fiddler, I do see the following response: try { Element.update("vote_score", "Score 58"); $("vote_score").visualEffect("highlight"); } catch (e) { alert('RJS error:\n\n' + e.toString()); alert('Element.update(\"vote_score\", \"Score 58\");\n$(\"vote_score\").visualEffect(\"highlight\");'); throw e } Will there be situation where the code is quite big (like 1 or 2k) that RJS can use some sort of static Javascript already loaded to handle the effect? Is there any other ways to use static Javascript already loaded with the page? Must it be just raw Javascript and use the Prototype's Ajax success response to call the static Javascript code, or can it be some Rails mechanism related to RJS?

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  • Programmatically manipulating DOM element value doesn't fire onchange event

    - by Johan Fredrik Varen
    Hi all. I've got a hidden form field, and when a button gets pressed the value of the hidden field is changed. Now, I've added an observer to the hidden field, listening for changes to occur. For some reason, though, the event listener never kicks in, even though the value of the hidden element changes. I'm using Prototype and Firefox 3.6. The code looks roughly like this: button.observe('click', function(event) { hiddenField.setValue(someValue); }); hiddenField.observe('change', function(event) { alert('It works!'); }); Does anyone have a clue why the latter observer doesn't execute? Thanks!

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  • Using HTTP status codes to reflect success/failure of Web service request?

    - by jgarbers
    I'm implementing a Web service that returns a JSON-encoded payload. If the service call fails -- say, due to invalid parameters -- a JSON-encoded error is returned. I'm unsure, however, what HTTP status code should be returned in that situation. On one hand, it seems like HTTP status codes are for HTTP: even though an application error is being returned, the HTTP transfer itself was successful, suggesting a 200 OK response. On the other hand, a RESTful approach would seem to suggest that if the caller is attempting to post to a resource, and the JSON parameters of the request are invalid somehow, that a 400 Bad Request is appropriate. I'm using Prototype on the client side, which has a nice mechanism for automatically dispatching to different callbacks based on HTTP status code (onSuccess and onFailure), so I'm tempted to use status codes to indicate service success or failure, but I'd be interested to hear if anyone has opinions or experience with common practice in this matter. Thanks!

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  • AJAX calls from multiple browser tabs at the same time:

    - by Bindi
    When an user tries to send AJAX requests simultaneously from multiple browser tabs, the earlier requests get completed and the page loads but the other AJAX calls are preempted. AS a result of which the response is empty for the other calls. Only one call survives. In my application using struts 2.0, JSP and javascript and the prototype framework, i found that the server response is empty in the cases mentioned above though the data gets updated in teh database with the request parameters. The onSucess event handler for Ajax.request gets called but the the response is empty. Can you please help? Thanks

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  • setsockopt (sys/socket.h)

    - by lojin
    The prototype for setsockopt is: int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len); Are the following all correct ? Which are not ? a.) int buffsize = 50000; setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&buffsize, sizeof(buffsize)); b.) int buffsize = 50000; setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void *)&buffsize, sizeof(buffsize)); c.) char *buffsize = "50000"; setsockopt(s, SOL_SOCKET, SO_RCVBUF, buffsize, strlen(buffsize)); d.) setsockopt(s, SOL_SOCKET, SO_RCVBUF, "50000", 5);

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  • Ajax / GroovyGrails Post data coming over with unexpected leading character. Who is encoding/decod

    - by ?????
    I'm having an encoding issue, and I'm not sure where to look for the problem. I have this Ajax.Request function (prototype library) sending data to a Groovy/Grails encoder var myAjax = new Ajax.Request(url, {method:'post', encoding:'UTF-8', contentType:'application/x-www-form-urlencoded', parameters:{'content':new_content}, onSuccess:success, onFailure:failure}); The data is coming in with an unexpected %A0 at the beginning: I have this simple controller that just echos the content back: def titlechange = { def content = URLDecoder.decode(params['content']) printf("Content: %s; DecodedContent = %s\n", params['content'], content) response.characterEncoding='UTF-8' render content } the debug print statement shows: Content: %A0Hello%2C%20world%21; DecodedContent = †Hello, world! Where is that %A0 coming from? My grails configuration has this: // The default codec used to encode data with ${} grails.views.default.codec="none" // none, html, base64 grails.views.gsp.encoding="UTF-8" grails.converters.encoding="UTF-8 Is the issue on the grails side or on the JavaScript side?

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  • What would you use for auto completion in Rails app?

    - by Andrei
    I want to use auto-completion in a number of fields (5-7) in my forms. There is a screencast on auto-completion with Prototype library by Ryan Bates ( http://railscasts.com/episodes/102-auto-complete-association). On the other hand, I have noticed that quite many guys suggest jQuery for this task ( http://jquery.bassistance.de/autocomplete/demo/). And I guess, there was probably some development last year(s), so I ask you - what would you use nowadays to auto-complete your form fields and why? BTW, I still have an open question on auto completion for HABTM association: http://stackoverflow.com/questions/1510935/how-to-do-habtm-management-with-auto-completion-in-rails

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  • How can I catch a change event from an HTML text field when a user clicks on a link after editing?

    - by Eric the Red
    Our webapp has a form with fields and values that change depending on values entered. Each time there is a change event on one of the form elements, we use an expensive AJAX call to update other elements on the page. This works great for selects, radio buttons and checkboxes. The issue comes in when a user adds content to a text field, and then clicks a link without taking the focus from the text field. The browser moves to a new page, and the contents of the text field are never saved. Is there an easy way to code around this? The AJAX call is too expensive to call with each key press. Here's an example of my Prototype code at the moment: $$('.productOption input.text').invoke('observe', 'change', saveChangeEvent);

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  • Can events fired from an iframe be handled by elements in its parent?

    - by allyourcode
    Suppose I have a page located at www.example.com/foo, and it contains an iframe with src="http://www.example.com/bar". I want to be able to fire an event from /bar and have it be heard by /foo. Using the Prototype library, I've tried doing the following without success: Element.fire(parent, 'ns:frob'); When I do this, in ff 3.5, I get the following error: Node cannot be used in a document other than the one in which it was created" code: "4 Line 0 Not sure if that's related to my problem. Is there some security mechanism that's preventing scripts in /bar from kicking off events in /foo?

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