onerror

Why won't this code work?

由 泄露秘密 提交于 2019-12-25 17:38:08
问题 Can anyone tell me why this code won't work? <?php $err=1; ?> <img src="334234234234234.gif" onError="<?php $err=0; ?>" /> <?php echo "<br />" . $err; ?> Even when the image exists, the onerror is still executed. Why? 回答1: HTML cannot set PHP variables. Those can only be set while on the server. The onError method of the IMG tag has no access to PHP variables. The page life-cycle: (SERVER) The server builds your page (handling variables, etc) (SERVER -> CLIENT) The server sends out the page

iOS RxSwift how to prevent sequence from being disposed on (throw error)?

由 我的未来我决定 提交于 2019-12-23 21:17:33
问题 I have a sequence made up of multiple operators. There are total of 7 places where errors can be generated during this sequence processing. I'm running into an issue where the sequence does not behave as I expected and I'm looking for an elegant solution around the problem: let inputRelay = PublishRelay<Int>() let outputRelay = PublishRelay<Result<Int>>() inputRelay .map{ /*may throw multiple errors*/} .flatmap{ /*may throw error*/ } .map{} .filter{} .map{ _ -> Result<Int> in ...} .catchError

javascript: onload and onerror called together

由 江枫思渺然 提交于 2019-12-19 04:03:13
问题 I'm new to JavaScript and therefore confused for the variable scope... I'm trying to load an image, and replace it with another URL when it doesn't exist. I have to do it in pure JavaScript. Here I got 2 versions extremely alike, but they perform differently. The only thing in common is: they don't work. The 3rd version requires a refresh and doesn't work under IE. d is the object with number attribute, which has no problem. Here is what they have in common .attr("xlink:href", function (d) {

Get the actual Javascript Error object with window.onerror

由 喜夏-厌秋 提交于 2019-12-17 22:33:49
问题 Javascript has this great callback window.onerror . It's quite convenient to track any error. However, it calls with the error name, the file name and the line. It's certainly not as rich as getting the actual error object from a try...catch statement. The actual error object contains a lot more data, so I am trying to get that. Unfortunately, try...catch statement do not work fine when you start having async code. Is there a way to combine and get the best of both worlds? I initially looked

How to tell if a <script> tag failed to load

由 我是研究僧i 提交于 2019-12-17 02:27:34
问题 I'm dynamically adding <script> tags to a page's <head> , and I'd like to be able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever. In Firefox, this works: var script_tag = document.createElement('script'); script_tag.setAttribute('type', 'text/javascript'); script_tag.setAttribute('src', 'http://fail.org/nonexistant.js'); script_tag.onerror = function() { alert("Loading failed!"); } document.getElementsByTagName('head')[0].appendChild

Javascript : passing a function as an argument

由 不羁岁月 提交于 2019-12-13 05:48:08
问题 I want to load a default image if an image fails to load. I also want to call getLoadComplete() once the image has loaded. How do I pass the this.getLoadComplete() function into the function called on img.onerror? Here is the code I've got: img.onload = this.getLoadComplete(); img.onerror = function(){ img.src = "http://xxxx.com/image.gif"; } img.src = request.url; 回答1: img.onload = this.getLoadComplete(); You're invoking getLoadComplete() immediately, and assigning its return value to img

Does Safari support javascript window.onerror?

由 痞子三分冷 提交于 2019-12-12 12:29:50
问题 I have a function attached to window.onerror window.onerror = function(errorMsg, url, line) { window.alert('asdf'); };"; This works fine in firefox, chrome and IE, but it doesn't work in safari. From some digging I read somewhere that safari does not support onerror. The post however was a few years old. Does safari currently support onerror? If not, is there a workaround? 回答1: Yes, Safari does support window.onerror with the function signature you posted: function(errorMsg, url, line) ,

javascript CORS onerror handler

由 老子叫甜甜 提交于 2019-12-12 10:52:35
问题 Background A few years ago there was an issue with the onerror handler and cross origin script tags, more info on that. Major browsers fixed the issue. Knowing this was a problem with detecting client side errors from CDNed scripts, they somewhat relaxed these constraints (firefox, webkit) Actual Question I'm hosting a simple page on localhost and including a script from a different domain (e.g. "sitea"), here's what the HTML looks like: <html> <head> <script>window.onerror = function(e, f, g

on error goto [label] not working in VBA

由 社会主义新天地 提交于 2019-12-11 16:28:41
问题 In one of my Excel workbooks I have created a macro containing the following lines: On Error GoTo saltaw Open fileout For Output As #iFileNumber However, when fileout contains some invalid chars ("\", for example) the macro stops and the error window "Runtime error '76': Path not found" appears, as if the on error goto line does not exist. Same if I substitute on error goto by on error resume next . The macro stops at the following line. Why? 回答1: Go to Tools -> Options -> General and set

Why don't I get a recursive infinite loop when throwing an error in the onError function?

由 无人久伴 提交于 2019-12-11 14:26:50
问题 In my coldfusion Application.cfc file, I define an onError function. In certain situations, I explicitly throw an exception using a cfthrow tag - e.g. <cfthrow object="#myException#"> . My question is, why doesn't this create an infinite loop? Or at least cause another call to the onError function? (Instead, it just dumps the error to the screen. Which is the functionality I want, actually :) - but I'm still confused about why this happens.) 回答1: This is expected and documented behavior: If
订阅 onerror