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  • Managing lots of callback recursion in Nodejs

    - by Maciek
    In Nodejs, there are virtually no blocking I/O operations. This means that almost all nodejs IO code involves many callbacks. This applies to reading and writing to/from databases, files, processes, etc. A typical example of this is the following: var useFile = function(filename,callback){ posix.stat(filename).addCallback(function (stats) { posix.open(filename, process.O_RDONLY, 0666).addCallback(function (fd) { posix.read(fd, stats.size, 0).addCallback(function(contents){ callback(contents); }); }); }); }; ... useFile("test.data",function(data){ // use data.. }); I am anticipating writing code that will make many IO operations, so I expect to be writing many callbacks. I'm quite comfortable with using callbacks, but I'm worried about all the recursion. Am I in danger of running into too much recursion and blowing through a stack somewhere? If I make thousands of individual writes to my key-value store with thousands of callbacks, will my program eventually crash? Am I misunderstanding or underestimating the impact? If not, is there a way to get around this while still using Nodejs' callback coding style?

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  • jQuery ajax form submit - multiple post/get requests caused when validation fails

    - by kenny99
    Hi, I have a problem where if a form submission (set up to submit via AJAX) fails validation, the next time the form is submitted, it doubles the number of post requests - which is definitely not what I want to happen. I'm using the jQuery ValidationEngine plugin to submit forms and bind validation messages to my fields. This is my code below. I think my problem may lie in the fact that I'm retrieving the form action attribute via $('.form_container form').attr('action') - I had to do it this way as using $(this).attr was picking up the very first loaded form's action attr - however, when i was loading new forms into the page it wouldn't pick up the new form's action correctly, until i removed the $(this) selector and referenced it using the class. Can anyone see what I might be doing wrong here? (Note I have 2 similar form handlers which are loaded on domready, that could also be an issue) $('input#eligibility').live("click", function(){ $(".form_container form").validationEngine({ ajaxSubmit: true, ajaxSubmitFile: $('.form_container form').attr('action'), success : function() { var url = $('input.next').attr('rel'); ajaxFormStage(url); }, failure : function() { //unique stuff for this form } }); }); //generic form handler - all form submissions not flagged with the #eligibility id $('input.next:not(#eligibility)').live("click", function(){ $(".form_container form").validationEngine({ ajaxSubmit: true, ajaxSubmitFile: $('.form_container form').attr('action'), success : function() { var url = $('input.next').attr('rel'); ajaxFormStage(url); }, failure : function() { } }); });

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  • Ruby on Rails - jrails not site wide

    - by Hamish
    Is it possible to configure jrails so that it only replaces the ruby on rails helper methods for some parts of the site? I am currently in a project where we are doing a staggered migration to jQuery so the site wide choice is not an option in this case.

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  • Java script Gallery - how to show a next image with an arrow - shiftImg(1)

    - by Srikanth Naidu
    //html file Image slideshow </script>   Loading image. Please wait 1     1/12 2/12 3/12 4/12 5/12 6/12 7/12 8/12   // //JS File var displayWaitMessage=true; // Display a please wait message while images are loading? var activeImage = false; var imageGalleryLeftPos = false; var imageGalleryWidth = false; var imageGalleryObj = false; var maxGalleryXPos = false; var slideSpeed = 0; var imageGalleryCaptions = new Array(); function startSlide(e) { if(document.all)e = event; var id = this.id; this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '_over.gif'; if(this.id=='arrow_right'){ slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 5); slideSpeed = -1*slideSpeedMultiply; slideSpeed = Math.max(-10,slideSpeed); }else{ slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 5); slideSpeed = 1*slideSpeedMultiply; slideSpeed = Math.min(10,slideSpeed); if(slideSpeed<0)slideSpeed=10; } } function releaseSlide() { var id = this.id; this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '.gif'; slideSpeed=0; } function gallerySlide() { if(slideSpeed!=0){ var leftPos = imageGalleryObj.offsetLeft; leftPos = leftPos/1 + slideSpeed; if(leftPos>maxGalleryXPos){ leftPos = maxGalleryXPos; slideSpeed = 0; } if(leftPos<minGalleryXPos){ leftPos = minGalleryXPos; slideSpeed=0; } imageGalleryObj.style.left = leftPos + 'px'; } setTimeout('gallerySlide()',20); } function showImage() { if(activeImage){ activeImage.style.filter = 'alpha(opacity=50)'; activeImage.style.opacity = 0.5; } this.style.filter = 'alpha(opacity=100)'; this.style.opacity = 1; activeImage = this; } function initSlideShow() { document.getElementById('arrow_left').onmousemove = startSlide; document.getElementById('arrow_left').onmouseout = releaseSlide; document.getElementById('arrow_right').onmousemove = startSlide; document.getElementById('arrow_right').onmouseout = releaseSlide; imageGalleryObj = document.getElementById('theImages'); imageGalleryLeftPos = imageGalleryObj.offsetLeft; imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 80; maxGalleryXPos = imageGalleryObj.offsetLeft; minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft; var slideshowImages = imageGalleryObj.getElementsByTagName('IMG'); for(var no=0;no<slideshowImages.length;no++){ slideshowImages[no].onmouseover = showImage; } var divs = imageGalleryObj.getElementsByTagName('DIV'); for(var no=0;no<divs.length;no++){ if(divs[no].className=='imageCaption')imageGalleryCaptions[imageGalleryCaptions.length] = divs[no].innerHTML; } gallerySlide(); } function showPreview(imagePath,imageIndex){ var subImages = document.getElementById('previewPane').getElementsByTagName('IMG'); if(subImages.length==0){ var img = document.createElement('IMG'); document.getElementById('previewPane').appendChild(img); }else img = subImages[0]; if(displayWaitMessage){ document.getElementById('waitMessage').style.display='inline'; } document.getElementById('largeImageCaption').style.display='none'; img.onload = function() { hideWaitMessageAndShowCaption(imageIndex-1); }; img.src = imagePath; } function hideWaitMessageAndShowCaption(imageIndex) { document.getElementById('waitMessage').style.display='none'; document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex]; document.getElementById('largeImageCaption').style.display='block'; } function shiftImg(imageIndex){ } window.onload = initSlideShow;

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  • Regarding Google Safe Browsing API

    - by Steve
    Does anyone know how to use the Google safe browsing API. I downloaded the entire the malware and phish update from the google safe browsing using the API key and tried comparing the hash of the suspicious site (md5_file method in php) but it did not work. I also tried comparing the hash of the suspicious site's url (md5 method in php). Am I doing something wrong here?

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  • How to close unclosed HTMl Tags?

    - by Starx
    Whenever we are fetching some user inputed content with some editing from the database or similar sources, we might retrieve the portion which only contains the opening tag but no closing. This can hamper the website's current layout. Is there a clientside or server way of fixing this?

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  • How to replace html element with ajax response?

    - by user2885137
    How do I replace the html element from ajax response? What I know to is to remove the element, how do I replace that removed tag with ajax response? For example: I have code like this: <ul id="products"> ............... </ul> When I click on a button the ajax call is made to codeginter controller where I recieve the new data pulled from the database and rendered in another view which starts from ul and ends at closing ul. In ajax success function I do this: $('#products').remove(); //What to do now here to replace the removed portion with response of ajax?

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  • Only show activities from a specific gadget in OpenSocial

    - by corné
    I created a gadget which is able to post activities: function postActivity(text) { var params = {}; params[opensocial.Activity.Field.TITLE] = text; var activity = opensocial.newActivity(params); opensocial.requestCreateActivity(activity, opensocial.CreateActivityPriority.HIGH); }; And I request activities by doing: req.add(req.newFetchActivitiesRequest( new opensocial.IdSpec({'userId' : 'VIEWER', 'groupId' : 'FRIENDS'})), 'friends_activities'); My question is: How can I filter activities to only show activities posted by a specific gadget? I reckon the field "appId" is meant for this, but this field is empty in the response.

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  • Checking a checkbox node programmatically with jsTree

    - by Raj
    In a tree built with jsTree, I have the text within the <a> tag sitting in a variable. I would like to check that node. How can I do so? I am currently finding that node, using jQuery, and altering its class. However, this does not repair the parent node by making the parent undetermined in its class. I tried doing $('.colors').jstree("checkbox_repair"), but that didn't seem to do anything. It would be great if someone could actually answer both those questions, since they are related to the same problem. Here is a jsFiddle, illustrating the issue-- http://jsfiddle.net/thapar/5XAjU/

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  • Excanvas does not work in IE8 at all

    - by Matt Null
    I simply cannot get excanvas to work at all. I have tried everything I can think of. I am even uploading the examples that come with excanvas to my website and testing them and they do not even work. I don't know if it has something to do with my server or what, but I haven't seen a working excanvas image yet. for instance... I this example comes with the excanvas package and it does not work for me... does anyone know what this could possibly be? thanks http://www.javascriptkids.com/tools/excanvas/examples/example1.html

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  • Problem with multiple select removing more than 1 option

    - by SoLoGHoST
    Ok, there seems to be a problem with the JS Code for Opera browsers, as it only removes the last option tag that is selected within a multiple select tag, can someone please help me. Here is the HTML for this: <select id="actions_list" name="layouts" multiple style="height: 128px; width: 300px;"> <option value="forum">forum</option> <option value="collapse">collapse</option> <option value="[topic]">[topic]</option> <option value="[board]">[board]</option> </select> Ofcourse it's within a form tag, but there's a ton more code involved with this form, but here is the relevant info for this. Here is the JS that should handle this, but only removes the last selected option in Opera, not sure about other browsers, but it really needs to remove all selected options, not just the last selected option... argg var action_list = document.getElementById("actions_list"); var i = action_list.options.length; while(i--) { if (action_list.options[i].selected) { action_list.remove(i); } } What is wrong with this? I can't figure it out one bit :( Thanks :)

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  • Send post request from client to node.js

    - by Husar
    In order to learn node.js I have built a very simple guestbook app. There is basically just a comment form and a list of previous comments. Currently the app is client side only and the items are stored within local storage. What I want to do is send the items to node where I will save them using Mongo DB. The problem is I have not yet found a way to establish a connection to send data back and forth the client and node.js using POST requests. What I do now is add listeners to the request and wait for data I send: request.addListener('data', function(chunk) { console.log("Received POST data chunk '"+ chunk + "'."); }); On the client side I send the data using a simple AJAX request: $.ajax({ url: '/', type: 'post', dataType: 'json', data: 'test' }) This does not work at all in them moment. It could be that I don't know what url to place in the AJAX request 'url' parameter. Or the whole thing might just be the build using the wrong approach. I have also tried implementing the method described here, but also with no success. It would really help if anyone can share some tips on how to make this work (sending POST request from the client side to node and back) or share any good tutorials. thanks.

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  • HTML 5 Canvas - Dynamically include multiple images in canvas

    - by Ron
    I need to include multiple images in a canvas. I want to load them dynamically via a for-loop. I tried a lot but in the best case only the last image is displayed. I check this tread but I still get only the last image. For explanation, here's my latest code(basically the one from the other post): for (var i = 0; i <= max; i++) { thisWidth = 250; thisHeight = 0; imgSrc = "photo_"+i+".jpg"; letterImg = new Image(); letterImg.onload = function() { context.drawImage(letterImg,thisWidth*i,thisHeight); } letterImg.src = imgSrc; } Any ideas?

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  • Choose a local file w/o uploading the chosen file

    - by Austin Hyde
    I am making a simple development tool for myself using PHP on my local development server. I would like a way to have a simple file-chooser to select a file without uploading it, but just retaining the file path. This is useful, because I will be the only one using the tool, and so PHP will have access to the chosen file without having it uploaded. My first thought is to have a <input type="file"...>, but as far as I know, there's no way to prevent the upload from happening. Is there a way to do this?

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  • How can I have a mouseover/in one off check?

    - by Denis Hoctor
    Hi all, How can I test if a mouse is within a given div? I know how to use events to do something when it occurs but is it possible to check it on pageload only? What I want to do is smething like: if(mouse is in specified div) { check = true; } else { check = false; } Thanks, Denis

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  • javascrip scrollTo(x,y) not working for me.

    - by harry_T
    I am trying to position the page to a specific location after user clicks on a link. I am using javascrip scrollTo(), but it is not working for me. Need advice or alternative way of doing this Try this link. http://tinyurl.com/ye5khug select Edmonton or Calgary, then select an option in column on right.

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  • ignore firebug console when not installed

    - by Richard
    I use Firebug's console.log() for debugging my website. If I try viewing my website in browsers without Firebug then I get a console is not defined error. Is there a way to gracefully avoid this error? I found this potential solution, but it seems a bit cumbersome. And ideas?

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