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Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated. ...
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How to close current tab in a browser window?

... You will need Javascript to do this. Use window.close(): close(); Note: the current tab is implied. This is equivalent: window.close(); or you can specify a different window. So: function close_window() { if (confirm("Close Window?")...
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Appending to an object

I have an object that holds alerts and some information about them: 13 Answers 13 ...
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how to implement a pop up dialog box in iOS

After a calculation, I want to display a pop up or alert box conveying a message to the user. Does anyone know where I can find more information about this? ...
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How to get the browser language using JavaScript [duplicate]

... Try this script to get your browser language <script type="text/javascript"> var userLang = navigator.language || navigator.userLanguage; alert ("The language is: " + userLang); </script> Cheers ...
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What's “this” in JavaScript onclick?

What does this mean in the script? 8 Answers 8 ...
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How to detect online/offline event cross-browser?

...r agent will not contact the network when the user follows links or when a script requests a remote page (or knows that such an attempt would fail), and must return true otherwise. Finally, the spec notes: This attribute is inherently unreliable. A computer can be connected to a network without ha...
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Best way to store JSON in an HTML attribute?

...to attribute sizes. If you do run into them, then store the data in a <script>. Define an object and map element ids to property names in that object. What if the JSON contains special characters? (e.g. {test: '<"myString/>'}) Just follow the normal rules for including untrusted d...
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click or change event on radio using jquery

...input type="radio" name="radioName" value="2" />two </form> <script> $('#myForm input[type=radio]').change(function() { alert(this.value); }); </script> You must make sure that you initialized jquery above all other imports and javascript functions. Because $ is a ...
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Check if element is visible in DOM

...e display style property. Just make sure that the element isn't fixed. A script to check this, if you have no position: fixed; elements on your page, might look like: // Where el is the DOM element you'd like to test for visibility function isHidden(el) { return (el.offsetParent === null) } ...