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How can I detect if a browser is blocking a popup?

...); },200); }else{ popup_window.onload = function () { scope.is_popup_blocked(scope, popup_window); }; } } else { scope.displayError(); } }, is_popup_blocked: function(scope...
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addEventListener vs onclick

...avaScript programmers thinks that the event name is for example onclick or onload. on is not a part of event name. Correct event names are click and load, and that's how event names are passed to .addEventListener(). Works in almost all browser. If you still have to support IE <= 8, you can use a...
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How to open a local disk file with JavaScript?

...; if (!file) { return; } var reader = new FileReader(); reader.onload = function(e) { var contents = e.target.result; displayContents(contents); }; reader.readAsText(file); } function displayContents(contents) { var element = document.getElementById('file-content'); elem...
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Set keyboard caret position in html textbox

...en they receive focus: function addLoadEvent(func) { if(typeof window.onload != 'function') { window.onload = func; } else { if(func) { var oldLoad = window.onload; window.onload = function() { if(oldLoad) ...
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Make iframe automatically adjust height according to the contents without using scrollbar? [duplicat

... your iframe to this: <iframe src="..." frameborder="0" scrolling="no" onload="resizeIframe(this)" /> As found on sitepoint discussion. share | improve this answer | ...
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JavaScript global event mechanism

...tpRequest'); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.onload = function() { if (xhr.status === 200) { console.log('JS error logged'); } else if (xhr.status !== 200) { console.error('Failed to log JS error.'); console.error(xhr); console.er...
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How to detect idle time in JavaScript elegantly?

...a JavaScript: var inactivityTime = function () { var time; window.onload = resetTimer; // DOM Events document.onmousemove = resetTimer; document.onkeypress = resetTimer; function logout() { alert("You are now logged out.") //location.href = 'logout.html' ...
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How to parse Excel (XLS) file in Javascript/HTML5

...rseExcel = function(file) { var reader = new FileReader(); reader.onload = function(e) { var data = e.target.result; var workbook = XLSX.read(data, { type: 'binary' }); workbook.SheetNames.forEach(function(sheetName) { // Here is your object ...
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How to change the opacity (alpha, transparency) of an element in a canvas element after it has been

...ctx.restore(); If you need img to be loaded: var img = new Image(); img.onload = function() { ctx.save(); ctx.globalAlpha = 0.4; ctx.drawImage(img, x, y); ctx.restore() }; img.src = "http://..."; Notes: Set the 'src' last, to guarantee that your onload handler is called on all...
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Detect Click into Iframe using JavaScript

... "\n"; console.value = text; } function attachOnloadEvent(func, obj) { if(typeof window.addEventListener != 'undefined') { window.addEventListener('load', func, false); } else if (typeof document.addEventListener != 'undefined') { ...