unobtrusive javascript - Page 106

loading "child page" inside "parent page" through javascript and functionality of "child page" throws ERROR

- by user1304589

i have a masterpage. Its content place holder i.e page "parent page", contains a button "Call Batch". On click "Call Batch", the "child page" is loaded in div of "parent page" using javascript without refresh! Now this "Child Page" contains a label and a button. On click of button the text of label shoud change. I want the functionality of "child page" on "parent page". I got the "child page" in "parent page" div but the functionality of "child page" is lost and i am getting error.Where to put the code of button click event which changes the text of label? Please Help.

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Prototyping Object in Javascript breaks jQuery?

- by blesh

I have added a simple .js to my page that has some pretty mundane common-task sort of functions added to the Object and Array prototypes. Through trial and error I've figured out that adding any function to Object.prototype, no matter it's name or what it does causes javascript errors in jQuery: The culprit? Object.prototype.foo = function() { /*do nothing and break jQuery*/ }; The error I'm getting line 1056 of jquery-1.3.2.js, in the attr:function { } declaration: /*Object doesn't support this property or method*/ name = name.replace(/-([a-z])/ig, function(all, letter) { return letter.toUpperCase(); }); Apparently G.replace is undefined. While it's obvious that there's something I'm just not wrapping my head around with prototyping, I'm failing miserably to figure out what it is. To be clear, I'm not looking for a workaround, I have that handled... what I'm looking for is an answer to 'Why?'. Why does adding a function to Object.prototype break this bit of code?

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Javascript problems?

- by jiexi

I've been staring at the source code of these two download pages for awhile now and i can't seem to find the problem. I have two download pages, one where the javascript is working, one where it isnt. working: http://justupload.it/v/lfd7 not: http://justupload.it/v/ljhv The working one allows me to rotate the image and reveal the comments box by clicking on the comments button. The non-working one does not let me do that stuff. Can anyone help me find the problem or recommend a program to help me do it?

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How to escape HAML for Javascript in Sinatra

- by viatropos

I would like to return a list/combobox from an ajax request ("Which on of these do you like?" type thing). I would like to write that little snippet in HAML, which converts it to HTML, but when I do, the page goes blank. I'm assuming this is because the HTML isn't escaped. Is there a way to escape HAML so I can do $("#mydiv").html(response);? Here's the method: post "/something" do # process... haml :"partials/_select", :layout => false, :locals => {:collection => choices} end ... the haml template: %select - collection.each do |item| %option{:value => item.to_s}= item.to_s ... and the javascript: success: function(responseText, statusText, xhr, $form) { $(".dialog_content").append(responseText); } I have tried the sinatra_more plugin and the escape_javascript method, but there's problems with the haml buffer in sinatra. Any ideas?

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Drawing a path with a line in OpenLayers using JavaScript

- by Andreas Grech

I have seen the examples presented here of how to draw a line but the examples only show how to do it with the mouse, by clicking. What I want to do is draw the line manually using JavaScript given a list of Longitude and Latitude coordinates. The reason I cannot work on the source provided in the link above is because they are only calling activate on the feature, and then let the user point and click on the map. Has anyone ever drew a path on an OpenLayers map programatically? What I want to do is exactly this: http://openspace.ordnancesurvey.co.uk/openspace/example4.html, but without using OpenSpace.

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Trouble retrieving inner text from XML node using JavaScript

- by Jack Roscoe

I'm reading an XML document using JavaScript & jQuery, and need to extract some text from inside a node to save into an array. The structure of the XML is as such: <C> <I> <TEXTFORMAT> <P> <FONT>Here's the text I want</FONT> </P> </TEXTFORMAT> </I> </C> Everything I've tried so far returns nothing so I must be incorrectly referencing the contents of the FONT tag. What XML path should I be using?

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JavaScript "Cannot retrieve referenced URL"

- by jb

I have JavaScript inside a .wsf file and I'm getting the error: C:\bin\LDLSInfo.wsf(53, 34) Windows Script Host: Cannot retrieve referenced URL: S:\tools\JScript\lib\StandardWSH.js At line 53, it says <script language="JScript" src="S:\tools\JScript\lib\StandardWSH.js"/> I know that LDLSInfo.wsf (the main script) and StandardWSH.js (the script to load) both work fine, because I've ran them from a different machine. It works fine on one machine and not on the other, both are Windows 7 x64 computers. So I'm thinking I'm missing some .dll's. Thanks for the help, -jb

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JavaScript border-color/color styling

- by Dan

Hi! I'd like to style 'input.submit' of a form (hover effect for IE) using JS and tried the following which doesn't work unfortunately.  Could you please fix this for me? TIA, Dan

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How to disable Events for a while in Javascript or jQuery

- by Tarik

Hello, I am wondering if you guys know different approach to disable an event for a while. Let me elaborate this more : Lets say I have a div or button which has a subscriber to its onclick event. To prevent the double click when the the methods are doing some ajax things, these are the some of the ways we can do : Disable the button till the method finishes its job Unbind till the methods finishes its job and then bind it again. Use some kind of flagging system like boolean so it will prevent method from working more than once. So is there any other ways, maybe some javascript tricks or jQuery tricks which is more efficient and better practice. Thanks in advance.

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JavaScript setTimeout setInterval within one function

- by dagoof

I think I might be overtired but I cannot for the life of me make sense of this, and I think it's due to a lack of knowledge of javascript var itv=function(){ return setInterval(function(){ sys.puts('interval'); }, 1000); } var tout=function(itv){ return setTimeout(function(){ sys.puts('timeout'); clearInterval(itv); }, 5500); } With these two functions I can call a=tout(itv()); and get a looping timer to run for 5.5 seconds and then exit, essentially. By my logic, this should work but it simply is not var dotime=function(){ return setTimeout(function(){ clearInterval(function(){ return setInterval(function(){ sys.puts("interval"); }, 1000); }); }, 5500); } any insight in this matter would be appreciated.

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asynchronous javascript loading/executing

- by Kai

In this post, asynchronous .js file loading syntax, someone said, "If the async attribute is present, then the script will be executed asynchronously, as soon as it is available." (function() { var d=document, h=d.getElementsByTagName('head')[0], s=d.createElement('script'); s.type='text/javascript'; s.async=true; s.src='/js/myfile.js'; h.appendChild(s); }()); /* note ending parenthesis and curly brace */ My question is, what does "the script will be executed asynchronously" mean? Will this script be executed in a different thread from other javascripts in the page? If yes, should we worry about synchronization issue in the two threads? Thanks.

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Javascript progress bar

- by srinath

I want to have a progress bar (e.g. 200 links total, 20 done, therefore 10% complete). The bar should show when i click on button "validate now" . My requirement is to check 2000 urls which are working or not . This was taking a lot of time while executing in program . so i need to show a progress bar on user end to know the status Can any one please help me using on javascript . thanks, sri..

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Virtual Earth / Bing maps javascript file size

- by Aquinas

I am working with a site that uses virtual earth for its mapping. Unfortunately the file size of the referenced javascript file, ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2, is 200 something kb before being expanded (to 970kb). As our site runs under https this file is not cached on the client, and can cause a few seconds delay to users, made more substantial in times of high load. My question is, is there anyway to get virtual earth to run smaller, or have more efficient lazy loading? At the moment it looks like our hands are tied.

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javascript error for the textbox

- by prince23

hi, <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick ="toggletr();" /> <script type ="text/javascript" > function toggletr() { debugger; var Inputs =$get("TextBox1"); } </script> i trying this i am getting error: Microsoft JScript runtime error: Object expected but in textbox it contains value //var Inputs = document .getElementById ("TextBox1"); if i do like this i am getting the value. can any one tell me how to solve this one in javscript using $get() or JQuery how to assign value thank you

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JavaScript: Reference a functions local scope as an object

- by eBusiness

When I call a function, a local scope is erected for that call. Is there any way to directly reference that scope as an object? Just like window is a reference for the global scope object. Example: function test(foo){ var bar=1 //Now, can I access the object containing foo, bar, arguments and anything //else within the local scope like this: magicIdentifier.bar } Alternately, does anyone have a complete list of what is in the global scope on top of custom variables? Background: I'm trying to get down to a way of completely shifting to global scope from within a function call, the with statement is a joke, call works a little better, but it still breaks for anything declared in function scope but not in global scope, therefore I would declare these few cases in global scope, but that requires me to know what they are. The IE function execScript makes a complete shift, but that only solves the problem for IE. Note: To anyone loading JavaScript dynamically, setTimeout(code,1) is a simple effective hack to achieve global scope, but it will not execute immediately.

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How to prevent a javascript/backbone.js cloned model from sharing attributes

- by user540727

I'm working with backbone.js models, so I don't know if my question is particular to the way backbone handles cloning or if it applies to javascript in general. Basically, I need to clone a model which has an attribute property assigned an object. The problem is that when I update the parent or clone's attribute, the other model is also updated. Here is a quick example: var A = Backbone.Model.extend({}); var a = new A({'test': {'some': 'crap'}}); var b = a.clone(); a.get('test')['some'] = 'thing'; // I could also use a.set() to set the attribute with the same result console.log(JSON.stringify(a)) console.log(JSON.stringify(b)) which logs the following: {"test":{"some":"thing"}} {"test":{"some":"thing"}} I would prefer to clone a such that b won't be referencing any of its attributes. Any help would be appreciated.

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Student's t distribution in JavaScript

- by Sai Emrys

Google Spreadsheets currently does not support the standard function TDIST - i.e. the Student's t-distribution. This function is critical for calculating p-values. It seems that this is related to the fact that no integral-using functions (AFAICT) are implemented either. However, Google Docs allows people to add and publish their own scripts, in JavaScript. So ideally we should have something like: function tdist(t_value, degrees_of_freedom, two_tailed [defaults true]) {...} Anyone know of either an extant implementation of this (my google-fu has not turned up one, but may be weaker than yours) or a good idea for how to do it? I'd like to publish this together with some other useful functions that are currently calculable but a bit of a pain (like Student's t-test itself). Thanks!

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Javascript top variable in IE8

- by Jim Rootham

I am trying to reference a javascript function in a .js file loaded in my main page from an iframe using the 'top' variable. It works in FF, Safari, and IE6 but not in IE8. The snippet is (assigned to onmouseover): top.set_image(this, 'images/login_h.png') Where set_image is my function. The error is "Object does not support this function" Also, I have been looking for the definition of top. I can't find it in the ECMAScript specification or the w3schools site and Google is unhelpful (who'da thunk top was a common word?).

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A better JavaScript version of addslashes and stripslashes?

- by karlthorwald

I am using these 2 functions: http://javascript.about.com/library/bladdslash.htm But JSLint complains 'Bad Escapement' on this line: str=str.replace(/\\0/g,'\0'); [Edit] I converted to 2 lines, and now the first line is the one that fails JLint: var rep = '\0'; str=str.replace(/\\0/g,rep); So it is the '\0' can you help? I could try something but I want to understand what is going on. [/Edit] Can you make a better version and explain? I would like a version that passes JSLint and still works.

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maths in Javascript.

- by Jared

Can someone please help me out with a javascript/jquery solution for this arithmetic problem... I need to subtract one number from the other. The problem is that the numbers have dollar signs (because its money). So it seems that jquery is treating them as strings instead of numbers. I have created two variables - toalAssets and totalLiabilites. I would like to subtract the latter from the former and place the result into another variable called netWorth Perhaps i need to use 'parseFloat'? But I'm not sure how - his is all a little over my head!

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is there any light weight javascript date picker

- by Zain Shaikh

I am using JQuery Date picker, but it is too much heavy, the minified version of ui.datepicker.min.js is of 44 KB. the images of datepicker have their own weigh. the jquery framework is of 59 KB. and total images on page are of around 80 KB the total html of page is around 70 KB and the css file size is around 72 KB. and much more, and all the things go upto 600 KB. which is 0.6 MB. do you think user will wait for 600 KB to be downloaded in the browser? it may take upto 8 - 10 secs. and I dont think that user will wait for such long time. I want to keep my website light weight. is there any light weight javascript date picker.

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javascript form validation in rails?

- by Elliot

Hey guys, I was wondering how to go about form validation in rails. Specifically, here is what I'm trying to do: The form lets the user select an item from a drop down menu, and then enter a number along with it. Using RJS, the record instantly shows up in a table below the form. Resetting the form with AJAX isn't a problem. The issue is, I don't want the person to be able to select the same item from that drop down menu twice (in 1 day at least). Without using ajax, this isn't a problem (as I have a function for the select statement currently), but now that the page isn't reloading, I need a way to make sure people cant add the same item twice in one day. That said, is there a way to use some javascript/ajax validation to make sure the same record hasn't been submitted during that day, before a duplicate can be created? Thanks in advance! Elliot

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Javascript Regex to convert dot notation to bracket notation

- by Tauren

Consider this javascript: var joe = { name: "Joe Smith", location: { city: "Los Angeles", state: "California" } } var string = "{name} is currently in {location.city}, {location.state}"; var out = string.replace(/{([\w\.]+)}/g, function(wholematch,firstmatch) { return typeof values[firstmatch] !== 'undefined' ? values[firstmatch] : wholematch; }); This will output the following: Joe Smith is currently in {location.city}, {location.state} But I want to output the following: Joe Smith is currently in Los Angeles, California I'm looking for a good way to convert multiple levels of dot notation found between braces in the string into multiple parameters to be used with bracket notation, like this: values[first][second][third][etc] Essentially, for this example, I'm trying to figure out what regex string and function I would need to end up with the equivalent of: out = values[name] + " is currently in " + values["location"]["city"] + values["location"]["state"];

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String comparison with a collation in javascript

- by fsb

I use jquery.autocomplete, which uses a javascript regexp to highlight substrings in the list of suggestions that match the autocomplete key string. So if the use types "Beat" and one of the autocomplete suggestions the server returns is "The Beatles" then plugin displays that suggestion as "The Beatles". I'm trying to think of ways to make this work with string matching that isn't sensitive to accents, diacriticals and the rest. So if the user typed "Huske" and the server suggested "Hüsker Dü" then this would be displayed as "Hüsker Dü". The principle is the same as string comparison with specified collations such as in MySql or ICU, or with Oracle's sorts. In SphinxSearch a charset_table works for this. A collation such as utf8_general_ci would be ideal for my purposes.

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Call javascript from objective-c, only works with system functions like alert() etc / phonegap

- by adrian

hi havent found the solution yet in the forum. i want to call a function i created in the index.html via a objective-c function. As explained in stringByEvaluatingJavaScriptFromString so the network detection doesnt work for me the function gets called but no javascript is called in the index.html here is the code i use - (void)updateReachability:(NSString*)callback { NSString* jsCallback = @"navigator.network.updateReachability"; if (callback) jsCallback = callback; NSString* status = [[NSString alloc] initWithFormat:@"%@({ hostName: '%@', ipAddress: '%@', remoteHostStatus: %d, internetConnectionStatus: %d, localWiFiConnectionStatus: %d });", jsCallback, [[Reachability sharedReachability] hostName], [[Reachability sharedReachability] address], [[Reachability sharedReachability] remoteHostStatus], [[Reachability sharedReachability] internetConnectionStatus], [[Reachability sharedReachability] localWiFiConnectionStatus]]; [webView stringByEvaluatingJavaScriptFromString:status]; [status release]; } If i log the status the string i see can be executed in the index.html file, the syntax is ok. but it doesnt get called if i do alert( etc... it gets called... need some help pls, because network detection is a kill criteria to publish a app!!! Adrian

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