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  • Why does Javascript's OR return a value other than true/false?

    - by Fletcher Moore
    I saw this construction in order to get the browser viewport width: function () { return window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; } I understand the browser quirks involved. What I don't understand is why || returns the value. So I tried this alert(undefined || 0 || 3); and sure enough, it alerts 3. I find this bizarre, because I expect true or false. Could anyone explain what's going on?

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  • Why aren't these Canvases rendering?

    - by bpapa
    I'm creating a web app that allows users to enter a number of colors, by specifying RGB values. Upon submission, the user will see a canvas with a solid rectangle drawn in the color chosen. On this page, I have 7 canvases. The first one draws just fine, but none of the rest show up. The browser is Safari. Here's the relevant code: First, the script element in the header, which defines the function I use to draw to the canvas. <script language="JavaScript" TYPE="text/javascript"><!-- function drawCanvas(canvasId, red, green, blue) { var theCanvas = document.getElementById("canvas" + canvasId); var context = theCanvas.getContext("2d"); context.clearRect(0,0,100,100); context.setFillColor(red,green,blue,1.0); context.fillRect(0,0,100,100); } // --> </script> Next, the HTML source, where I have my canvas tags and some embedded Javascript to call my drawCanvas function <canvas id="canvas0" width="100" height="100"> </canvas> <script language="JavaScript" TYPE="text/javascript"><!-- drawCanvas(0,250,0,0); // --> </script> . . //more source . <canvas id="canvas1" width="100" height="100"> </canvas> <script language="JavaScript" TYPE="text/javascript"><!-- drawCanvas(1,4,250,6); // --> </script> Also provided is a screenshot. As you can see, the "red" canvas comes up just fine, but the second one, which should be green, doesn't show up at all. Any ideas?

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  • how to unpack the contents of a javascript file?

    - by altvali
    Hi all! You know how those packed js files look like, right? eval(function(p,a,c,k,e,d){ ... } ('obfuscated-string'.split('|'),0,{})) It just so happens to be that i have to tweak some large legacy code that looks like that and i want to find a way to turn this into a more readable version. If that's not possible, can i at least get rid of the eval?

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  • Passing variables from PHP to Javascript back to PHP using Ajax.

    - by ObjectiveJ
    I hope this makes sesne, please bare with me. So I have a PHP page that contains variables, I have some radial boxes, and on click of them, it calculates a price for the item you have clicked on. I do this by activating a js function that I have passed some variables to. Like so. PHP: <?php $result = mssql_query("SELECT * FROM Segments ORDER BY 'Squares'"); if (!$result) { echo 'query failed'; exit; } while ($row = mssql_fetch_array($result)) { ?> <span><?php echo $row["Squares"]; ?></span><input name="squares" type="radio" onclick="ajaxCases('<?php echo $row["Squares"]; ?>', '<?php echo $row["StartCaseID"]; ?>', '<?php echo $row["StartMatrixPrice"]; ?>')" value="<?php echo $row["Squares"]; ?>"<?php if ($row["Squares"] == "1") { ?> checked="checked" <?php }else{ ?> checked="" <?php } ?>/> <?php } ?> As you can see onclick it goes to a function called ajaxcases, this function looks like this. function ajaxCases(squares,start,price){ $('#step1').html('<p style="margin:100px 0px 0px 100px"><img src="images/ajax-loader-bigindic.gif" width="32" height="32" alt="" /></p>'); $('#step1').load("ajax-styles.php?squares="+squares); prevId1 = ""; document.varsForm.caseid.value=start; $('#step1price').html('<span style="margin:0px 0px 0px 30px"><img src="images/ajax-loader-price.gif" width="24" height="24" alt="" /></span>'); $('#step1price').load("ajax-step1-price.php?Squares="+Squares); return true; } This then goes to a php page called ajax-step1-price.php and I try to recall the variable Squares. However it doesn't work, I thought it was a GET however that returns undefined. In Summary: I would like to know how to pass a variable from PHP to JS then back to PHP, or if someone could just tell me where I am going wrong that would be greatly appreciated.

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  • Is it possible to post to Facebook application Wall via JavaScript?

    - by Bess
    I have a Canvas Facebook app embedded via an iframe. I would like to include a feedback link which would encourage the user to leave a comment that would be added to the Application wall - this comment would open like a standard FB modal window. Is there anyway to post to to the Application Wall directly via JS? Everything I have found such as FB.Connect.StreamPublish(), only publishes to the users stream, I need to publish to the application stream. Thanks!

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  • How do I move an element from an array to another array in javascript?

    - by TiansHUo
    My code is like var shapes1 = [ r.image("node.gif",190, 100, 47, 45)]; var shapes2 =[]; for (var i = 0, ii = shapes1.length; i < ii; i++) { shapes1[i].mousedown(function(e){ var temp=this.clone(); shapes1.push(temp); //now I want to remove "this" from shapes1 //and put it into shape2 //HOW?? isDrag=true; e.preventDefault(); }); } Maybe this is the wrong way to do it? I should be using a class instead, but isn't that for DOM items?

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  • Javascript permission denied. Not cross domain?

    - by Dan
    I'm working on a web app that very rarely returns a Javacript permission denied error when attempting to access document elements. I'm well aware of cross-domain issues and I am actively pursuing them as a possible cause. My question is: are there other possible causes for a permission denied exception? Just want to make sure I'm looking in to all possible avenues. Thanks!

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  • Tooltips problem, making this javascript work with my smarty foreach loop, help pelase!

    - by Kyle Sevenoaks
    I am using an example of tooltips from http://www.dynamicdrive.com/dynamicindex5/stickytooltip.htm on www.euroworker.no/order I have this code here to work with, but it just doesn't seem to work correctly, I've tried everything I can think of (not a lot of things) Here's the code. {foreach from=$cart.cartItems item="item" name="cart"} <div class="{zebra loop="cart"}"> <div id="sgproductview"> <div id="cart2Varekode"> <p> {if $product.sku} <span class="param">{$item.product.sku}</span> {else} <span>{img src=$item.Product.DefaultImage.paths.1 alt=$item.Product.name_lang|escape}</span> {/if} </p> </div> <div id="cart2Produkt"> <p>{if $item.Product.ID} <a href="{productUrl product=$item.Product}" data-tooltip="sticky{$smarty.foreach.cart.iteration}" target="_blank">{$item.Product.name_lang|truncate:20}</a> {else} <span>{$item.Product.name_lang|truncate:20}</span> </a> {/if} </p> <p> {include file="order/itemVariations.tpl"} {include file="order/block/itemOptions.tpl"} {if $multi} {include file="order/selectItemAddress.tpl" item=$item} {/if} </p> </div> {if $item.Product.DefaultImage.paths.3} <div id="mystickytooltip" class="stickytooltip"> <div style="padding:5px;"> <div id="sticky1" class="atip" style="width:200px;"> <img src="{$item.Product.DefaultImage.paths.3}" alt="{$item.Product.name_lang|escape}"><br> {$item.Product.name_lang} </div> <div id="sticky2" class="atip" style="width:200px;"> <img src={$item.Product.DefaultImage.paths.3} alt="{$item.Product.name_lang|escape}"><br> {$item.formattedPrice} </div> <div id="sticky3" class="atip" style="width:200px;"> <img src="{$item.Product.DefaultImage.paths.3}" alt="{$item.Product.name_lang|escape}"><br> {$item.Product.name_lang}PRODUCT 3 </div> <div id="sticky4" class="atip" style="width:200px;"> <img src="{$item.Product.DefaultImage.paths.3}" alt="{$item.Product.name_lang|escape}"><br> {$item.Product.name_lang} </div> </div> </div> {/if} <div id="cart2Price"> <p class="actualPrice"> {$item.formattedPrice} </p> </div> <div id="salg"></div> <div id="cart2Salg"> <p></p> </div> <div id="antallbox"> <p class="cartQuant"> {textfield name="item_`$item.ID`" class="text"} </p> </div> <div id="cart2Total"> <p> {if $item.count == 1} <span class="basePrice">{$item.formattedBasePrice}</span><span class="actualPrice">{$item.formattedPrice}</span> {else} {$item.formattedDisplaySubTotal} <div class="subTotalCalc"> {$item.count} x <span class="basePrice">{$item.formattedBasePrice}</span><span class="actualPrice">{$item.formattedPrice}</span> </div> {/if} </p> </div> <div id="delete"> {if 'ENABLE_WISHLISTS'|config} <a href="{link controller=order action=moveToWishList id=$item.ID query="return=`$return`"}">{t _move_to_wishlist}</a> {/if} <a id="slett" href="{link controller=order action=delete id=$item.ID query="return=`$return`"}" title="Slett"><!--{t _remove}--></a> </div> </div> </div> {/foreach} Anyone can help? {html_image} doesn't work, by the way and all the extensions are present and correct.

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  • How to get a Javascript routine to NOT act if it's in a text box?

    - by talkingnews
    I've got a simple page, and in that page runs a simple jquery keypress routine to catch clicks of the numbers 1 to 9 (has to be that to pass RNIB accessibility test). And in that page is a form, which can have numbers entered as part of a postcode. http://find.talking-newspapers.co.uk/result.php?addressInput=kingston Scroll to the bottom, try typing 8 or 9 for example. The text is entered, but it also acts on the keypress. Expected, but not good. I'm aware of various things like document.getElementById, but I can't figure out how to put these together to ensure that while the cursor is in the text input box, it doesn't act out the keypress catcher.

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  • Javascript: Save json data as a file on the server / user's hard disk.

    - by DavidR
    I have developed an app that allows the user to fill out text fields with information. I want them to be able to press a button that will make a file with data (a really long array with info on what they typed and where it should go) so they can reload the data at a later date. I don't have a server now, and I am sending this app as a standalone html app to my friends for their use until I get hosing / mySql / etc. Is there a way that when they click on a button it will take this data (saved as an array, save_data), put it into a file, and basically begin the download process from their web-browser? And later on, what tech would I need to be looking into to save this into online user accounts?

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  • javascript disabling a div or a link? (for a 5-star rating system)

    - by Cyprus106
    Basically, I've created a 5-star rating system. Pretty typical. It shows how many stars other people have given the item, and then when a user hovers over the stars, it lights up x number of stars based on how many they're over. It's all run by AJAX. They click 5 stars it automatically adds their 5-star rating to the group. The problem is that after they rate it I want to turn the system off, but I can't seem to be able to do that. I've tried everything I can think of. I've tried using element.disable for the a hrefs and for the div, but it still lets them vote away, over and over again, at least in firefox.... Can anyone help me out with a method to simply "freeze" the stars on what the user voted?? If I need to add code that's cool! I figured it probably wasn't necessary in this situation!

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  • What are the differences between these three patterns of "class" definitions in JavaScript?

    - by user1889765
    Are there any important/subtle/significant differences under the hood when choosing to use one of these three patterns over the others? And, are there any differences between the three when "instantiated" via Object.create() vs the new operator? The pattern that CoffeeScript uses when translating "class" definitions: Animal = (function() { function Animal(name) { this.name = name; } Animal.prototype.move = function(meters) { return alert(this.name + (" moved " + meters + "m.")); }; return Animal; })(); and The pattern that Knockout seems to promote: var DifferentAnimal = function(name){ var self = this; self.name = name; self.move = function(meters){ return alert(this.name + (" moved " + meters + "m.")); }; return {name:self.name, move:self.move}; } and The pattern that Backbone promotes: var OneMoreAnimal= ClassThatAlreadyExists.extend({ name:'', move:function(){} });

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  • Complex JavaScript. What called me?

    - by tyndall
    Project I'm working on uses jQuery. I have a series of Ajax calls being made that load() other HTML fragments which in turn load() other fragments. The whole thing is confusing. I didn't write the code. Is there any tool which will allow me to walk the callstack so I can figure what is calling a method? any browser tools that would help me figure this out?

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  • javascript - dom - how to get info from a specific field?

    - by Fernando SBS
    <table id="movements" cellpadding="1" cellspacing="1"><thead><tr><th colspan="3">Movimentações de tropas:</th></tr></thead><tbody><tr> <td class="typ"><a href="build.php?gid=16"><img src="img/x.gif" class="att1" alt="Tropas atacantes chegando" title="Tropas atacantes chegando" /></a><span class="a1">&raquo;</span></td> <td><div class="mov"><span class="a1">1&nbsp;Ataque</span></div><div class="dur_r">em&nbsp;<span id="timer1">13:21:06</span>&nbsp;hrs.</div></div></td></tr><tr> <td class="typ"><a href="build.php?gid=16"><img src="img/x.gif" class="def1" alt="Tropas de reforço chegando" title="Tropas de reforço chegando" /></a><span class="d1">&raquo;</span></td> <td><div class="mov"><span class="d1">1&nbsp;Reforço</span></div><div class="dur_r">em&nbsp;<span id="timer2">0:14:55</span>&nbsp;hrs.</div></div></td></tr><tr> <td class="typ"><a href="build.php?gid=16"><img src="img/x.gif" class="att2" alt="Próprias tropas atacando" title="Próprias tropas atacando" /></a><span class="a2">&laquo;</span></td> <td><div class="mov"><span class="a2">1&nbsp;Ataque</span></div><div class="dur_r">em&nbsp;<span id="timer3">0:08:50</span>&nbsp;hrs.</div></div></td></tr><tr> <td class="typ"><a href="build.php?gid=16"><img src="img/x.gif" class="def2" alt="Próprias tropas reforçando" title="Próprias tropas reforçando" /></a><span class="d2">&laquo;</span></td> <td><div class="mov"><span class="d2">1&nbsp;Reforço</span></div><div class="dur_r">em&nbsp;<span id="timer4">2:50:45</span>&nbsp;hrs.</div></div></td></tr></tbody></table> this is the source code, what I need to is get the 0:14:55 . but it has to be based on the class="d1" because the id="timer2" is always changing, sometimes the 0:14:55 will be related to id="timer1", other times to id="timer3", but the class="d1" is always correct. How to do it? <td class="typ"><a href="build.php?gid=16"><img src="img/x.gif" class="def1" alt="Tropas de reforço chegando" title="Tropas de reforço chegando" /></a><span class="d1">&raquo;</span></td> <td><div class="mov"><span class="d1">1&nbsp;Reforço</span></div><div class="dur_r">em&nbsp;<span id="timer2">0:14:55</span>&nbsp;hrs.</div></div></td></tr><tr>

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  • An Inaccessible JavaScript Object property - Why is Firebug showing this?

    - by Matty
    So, I'm attempting to access the content of an object and for the life of me can't figure out why I can't. I'm starting to believe that the object doesn't have the properties that Firebug indicates that it does. More likely than that I'm just not using the right syntax to access them. Give the following function: function(userData) { console.log(userData); // statement 1 console.log(userData.t_nodecontent); // statement 2 } Which generates the following FireBug output for statement 1 and unknown for statement 2. Is there something obvious that I'm overlooking in the way I'm attempting to reference the value of t_nodecontent? I'm at a loss :(

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