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Add a global error trapper for the browser

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JavaScript errors are invisible unless you've got developer tools open,
which is making it hard for users to report errors. This change makes
JavaScript errors popup a big red alert
This commit is contained in:
Jeremy Ruston 2013-06-12 12:40:48 +01:00
parent 204bd69e83
commit c631916441
2 changed files with 60 additions and 3 deletions
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25
boot/boot.css.tid
View File

@ -6,9 +6,10 @@ Basic styles used before we boot up the parsing engine
*/
/*
Password prompt
Error message and password prompt
*/
.tw-password-wrapper {
.tw-password-wrapper, .tw-error-form {
font-family: sans-serif;
z-index: 20000;
position: fixed;
@ -21,6 +22,25 @@ Password prompt
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
}
.tw-error-form {
color: #fff;
text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
background-color: rgb(255, 75, 75);
border: 8px solid rgb(255, 0, 0);
}
.tw-error-form div {
padding-bottom: 1em;
}
.tw-error-prompt {
color: #000;
text-shadow: none;
}
.tw-password-wrapper {
color: #000;
text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
background-color: rgb(197, 235, 183);
@ -35,4 +55,3 @@ Password prompt
font-size: 16px;
line-height: 20px;
}

38
boot/boot.js
View File

@ -66,14 +66,51 @@ $tw.utils.log = function(/* args */) {
Display an error and exit
*/
$tw.utils.error = function(err) {
// Prepare the error message
var errHeading = "Internal JavaScript Error",
promptMsg = "Well, this is embarrassing. It is recommended that you restart TiddlyWiki by refreshing your browser";
// Log the error to the console
console.error(err);
if($tw.browser) {
// Display an error message to the user
var form = document.createElement("form"),
heading = document.createElement("h1"),
prompt = document.createElement("div"),
message = document.createElement("div"),
button = document.createElement("button");
heading.appendChild(document.createTextNode(errHeading));
prompt.appendChild(document.createTextNode(promptMsg));
prompt.className = "tw-error-prompt";
message.appendChild(document.createTextNode(err));
button.appendChild(document.createTextNode("close"));
form.className = "tw-error-form";
form.appendChild(heading);
form.appendChild(prompt);
form.appendChild(message);
form.appendChild(button);
document.body.insertBefore(form,document.body.firstChild);
form.addEventListener("submit",function(event) {
document.body.removeChild(form);
event.preventDefault();
return false;
},true);
return null;
} else {
// Exit if we're under node.js
process.exit(1);
}
};
/*
Use our custom error handler if we're in the browser
*/
if($tw.browser) {
window.addEventListener("error",function(event) {
$tw.utils.error(event.message);
return false;
});
}
/*
Check if an object has a property
*/
@ -1276,4 +1313,5 @@ $tw.boot.decryptEncryptedTiddlers(function() {
$tw.boot.startup();
});
})();