javascript-events

问题 I'm writing a library that amends a widget to a text area, so I need to detect when the user starts typing something: this.$input.bind('keydown keyup', function() { if (this.$input.val() == …) { … } } The .val() only updates when keyup is triggered. That's too much of a delay. I want to know the state of the input box on keydown . Do you know of a library that improves .val() ? 回答1: too late? can't imagine a scenario where 10ms would make that much of a difference, but you could always

问题 I'm writing a library that amends a widget to a text area, so I need to detect when the user starts typing something: this.$input.bind('keydown keyup', function() { if (this.$input.val() == …) { … } } The .val() only updates when keyup is triggered. That's too much of a delay. I want to know the state of the input box on keydown . Do you know of a library that improves .val() ? 回答1: too late? can't imagine a scenario where 10ms would make that much of a difference, but you could always

问题 I'm writing a library that amends a widget to a text area, so I need to detect when the user starts typing something: this.$input.bind('keydown keyup', function() { if (this.$input.val() == …) { … } } The .val() only updates when keyup is triggered. That's too much of a delay. I want to know the state of the input box on keydown . Do you know of a library that improves .val() ? 回答1: too late? can't imagine a scenario where 10ms would make that much of a difference, but you could always

问题 I'm writing a library that amends a widget to a text area, so I need to detect when the user starts typing something: this.$input.bind('keydown keyup', function() { if (this.$input.val() == …) { … } } The .val() only updates when keyup is triggered. That's too much of a delay. I want to know the state of the input box on keydown . Do you know of a library that improves .val() ? 回答1: too late? can't imagine a scenario where 10ms would make that much of a difference, but you could always

问题 I have this loop code to reduce the DOM calls in my javascript, and reuse them. aarr = []; for (var z=1; z<=10; z++) { c = z-1; aarr[c] = document.getElementById("a"+z); } I have been shown that if the code is ran before the DOM is complete, then the array is null. Moving the script after the last html code will work. So now I want to put this code inside the window.onload event so to not have to move the script code to the bottom of the page. But it apparently does not work because it

问题 I have this loop code to reduce the DOM calls in my javascript, and reuse them. aarr = []; for (var z=1; z<=10; z++) { c = z-1; aarr[c] = document.getElementById("a"+z); } I have been shown that if the code is ran before the DOM is complete, then the array is null. Moving the script after the last html code will work. So now I want to put this code inside the window.onload event so to not have to move the script code to the bottom of the page. But it apparently does not work because it

问题 I am updating a site that I've built for the Nintendo Wii, and am looking for a good way to debug the application. Wii's browser (a version of Opera 9.3) does not have any sort of JavaScript console. I was going to use one of the various remote debug console solutions (such as jsconsole.com), but none of them seem to work. I suspect the reason for this is some sort of unsupported functionality, but I cannot figure out what that is without a console or some sort of error output. Things I've

问题 if I have a list of object: var objectList= LIST_OF_OBJECT; each object in the list contains three attributes: " name ", " date "," gender " How to sort the objects in the list by " date " attribute ascending order? (the " date " attribute contain string value like "2002-08-29 21:15:31+0500") 回答1: The Array.sort method accepts a sort function, which accepts two elements as arguments, and should return: < 0 if the first is less than the second 0 if the first is equal to the second > 0 if the

问题 if I have a list of object: var objectList= LIST_OF_OBJECT; each object in the list contains three attributes: " name ", " date "," gender " How to sort the objects in the list by " date " attribute ascending order? (the " date " attribute contain string value like "2002-08-29 21:15:31+0500") 回答1: The Array.sort method accepts a sort function, which accepts two elements as arguments, and should return: < 0 if the first is less than the second 0 if the first is equal to the second > 0 if the

问题 Per the Google Autocomplete Places API documentation, the getPlace() call should return a Places object with all the location data, or, if that place doesn't exist (i.e. - the user ignored the suggestions), it should return a stub with just the name element of the Places object filled in. However, it only does this latter operation when the user hits ENTER, not if they TAB out of the field. I've tried looking at the change event, the keyup, keydown events. I've tried triggering a keydown