dom-events

问题 I have an iframe of Google Slides which I embedded in my web app. The iframe implementation is: <iframe ref={slidesRef} src={src} width='100%' height='100%' allowFullScreen={true}/> I want to listen to click events on the main web page (while the iframe is not necessarily in focus), then create their corresponding keypress events - and pass them to the iframe, thus making the slideshow iframe to trigger and react to the user key presses. I tried something like this: function onButtonClick(e)

问题 I have an iframe of Google Slides which I embedded in my web app. The iframe implementation is: <iframe ref={slidesRef} src={src} width='100%' height='100%' allowFullScreen={true}/> I want to listen to click events on the main web page (while the iframe is not necessarily in focus), then create their corresponding keypress events - and pass them to the iframe, thus making the slideshow iframe to trigger and react to the user key presses. I tried something like this: function onButtonClick(e)

问题 I have several dropdown select menus where a selection of the first changes the options of the second and a selection on the second changes the options of the third, and so on. I would like to remotely simulate a change (i.e. without the user clicking in the select menu) in the dropdown menu which will activate the Javascript to set the next dropdown's options. Just setting the value of the select menu - document.getElementById('...').value='....' - does not stimulate the Javascript events on

问题 I need to handle the case when a user clicks on a mapTypeControl differently than when it's set through map.setMapTypeId() . How do I listen for clicks on map type controls? 回答1: You can't listen for events on the default UI control set. But if you are strictly focused on differentiating between clicks on the mapTypeControl and map.setMapTypeId() , you could use the fact that you control the code that may call setMapTypeId() and add some state management code: // First, add a new state var:

问题 Let's imagine we have those Django models: class Band(models.Model): name = models.CharField(max_length=256, default="Eagles of Death Metal") class Song(models.Model): band = models.ForeignKey(Band) When using the admin to manage those models, the band field is associated to a Widget rendered by Django as a select html element. Django's admin also adds a green plus icon next to the select , clicking it opens a pop-up window where the user is presented with the Form to add a new band. When

问题 I have this event that sends the ID parameter to a function that generates a URL, but I want to send two parameters instead of just the ID. I'd like to send the name also. With this code I can only send one parameter, but I need to send two. Based on this other post where one parameter is passed, I tried the following: '<li id="link4"><a href="#" onclick="generateURL(\'' + jsonObject.id + '\');">Line</a></li>' This is the method that generates my URL function generateURL(id, name) { window

问题 I always wondered how clean is such approach - to remove an event listener from within that very listener. UPDATE: Internally I keep a hash of objects and listeners, so I potentially can remove event listener from any place. I'm just concerned of removing it from within itself. Will such action do a job actually? UPDATE I'm asking about addEventListener, removeEventListener stuff. 回答1: You can pass the once option to have a listener act only once, then remove itself. Docs: https://developer

问题 I always wondered how clean is such approach - to remove an event listener from within that very listener. UPDATE: Internally I keep a hash of objects and listeners, so I potentially can remove event listener from any place. I'm just concerned of removing it from within itself. Will such action do a job actually? UPDATE I'm asking about addEventListener, removeEventListener stuff. 回答1: You can pass the once option to have a listener act only once, then remove itself. Docs: https://developer

问题 I'm trying to debug a JavaScript onFocus event attached to a bunch of text boxes on a page. The bug occurs when selecting a text box and then tabbing to the next text box. I'm trying to debug this by placing a break point in the onFocus event using the Chrome Developer Tools. The problem I'm facing is that when I select a text box and the break point is caught, Chrome Developer Tools steals focus and does not return it, so I can't tab to the next text box. Anyone have an idea for a work

问题 I'm trying to debug a JavaScript onFocus event attached to a bunch of text boxes on a page. The bug occurs when selecting a text box and then tabbing to the next text box. I'm trying to debug this by placing a break point in the onFocus event using the Chrome Developer Tools. The problem I'm facing is that when I select a text box and the break point is caught, Chrome Developer Tools steals focus and does not return it, so I can't tab to the next text box. Anyone have an idea for a work