onload

React onLoad event on image tag is not getting called when using conditional render

由 心已入冬 提交于 2021-02-07 19:15:31
问题 I'm using the stateless functional component to add spinner while image is loading from the external resource, like so: function ExternalImage(props) { const [loaded, setLoaded] = useState(false); function onLoad() { console.log('loaded'); setLoaded(true); } return loaded ? <img onLoad={onLoad} src={props.src} alt={props.alt} {...props} /> : <Spin /> } And use it like so: <ExternalImage src={image.src} alt={image.alt} className="image" /> Why would the onLoad never get called? 回答1: When image

React onLoad event on image tag is not getting called when using conditional render

由 与世无争的帅哥 提交于 2021-02-07 19:14:46
问题 I'm using the stateless functional component to add spinner while image is loading from the external resource, like so: function ExternalImage(props) { const [loaded, setLoaded] = useState(false); function onLoad() { console.log('loaded'); setLoaded(true); } return loaded ? <img onLoad={onLoad} src={props.src} alt={props.alt} {...props} /> : <Spin /> } And use it like so: <ExternalImage src={image.src} alt={image.alt} className="image" /> Why would the onLoad never get called? 回答1: When image

Image object onload function firing instantly

由 好久不见. 提交于 2021-02-04 21:20:13
问题 I'm creating a few Image objects and when I setup network throttling in Dev Tools I see that onload functions are invoking before my images are fully loaded. I really cannot find the solution. My code: function imgObjects(data) { for (var i in data) { img[data[i].id] = new Image(); img[data[i].id].onload = imgReady(); img[data[i].id].name = data[i].name; img[data[i].id].src = data[i].image; } } function imgReady() { imgReadyCount++; console.log('Count: ', imgReadyCount); } I you happen to

Image object onload function firing instantly

由 折月煮酒 提交于 2021-02-04 21:16:48
问题 I'm creating a few Image objects and when I setup network throttling in Dev Tools I see that onload functions are invoking before my images are fully loaded. I really cannot find the solution. My code: function imgObjects(data) { for (var i in data) { img[data[i].id] = new Image(); img[data[i].id].onload = imgReady(); img[data[i].id].name = data[i].name; img[data[i].id].src = data[i].image; } } function imgReady() { imgReadyCount++; console.log('Count: ', imgReadyCount); } I you happen to

Image object onload function firing instantly

由 僤鯓⒐⒋嵵緔 提交于 2021-02-04 21:16:39
问题 I'm creating a few Image objects and when I setup network throttling in Dev Tools I see that onload functions are invoking before my images are fully loaded. I really cannot find the solution. My code: function imgObjects(data) { for (var i in data) { img[data[i].id] = new Image(); img[data[i].id].onload = imgReady(); img[data[i].id].name = data[i].name; img[data[i].id].src = data[i].image; } } function imgReady() { imgReadyCount++; console.log('Count: ', imgReadyCount); } I you happen to

DIV Horizontal scroll, how to onload to ID

由 为君一笑 提交于 2021-01-29 05:11:17
问题 Have a site with MANY horizontally scrolling DIV containers. On one of the containers we want it to scroll to a certain position onLoad. Recommendations to what the best solution is? To complicate it a little more, the container is vertically far down (i.e. below the fold) on the page and would rather not have the onLoad result in having the page scroll vertically down to this container, merely have this specific container scrolled horizontally and nothing else. Is this also possible? Many

Alternatives to window.onload

由 旧时模样 提交于 2021-01-28 04:20:51
问题 Is there a different option than window.onload=function; or <body onload="function();"> to call a function after the page loads. I have a script found on the net satisfies my needs, but it overrides window.onload , so this prevents me from using the native window.onload . Are there any alternatives? 回答1: Use addEventListener instead. Unfortunately it does not work in IE, but you can work around that by also implementing attachEvent. window.addEventListener('load', function (){ alert('Function

Calling an object function from onload event makes it lose the context

由 喜欢而已 提交于 2021-01-28 00:00:39
问题 I wanted to call a function when all required images are loaded. The number of images is known in advance, so I tried attaching a function call to the onload event of each image and count the number of times it was called. <html> <head> <script> var tractor; function Tractor() { this.init_graphics(); } Tractor.prototype.init_graphics = function() { this.gr_max = 3; this.load_count = 0; this.loading_complete(); // #1 test call, works OK this.img1 = new Image(); this.img1.onload = this.loading

Image onload not called when setting source

由 余生长醉 提交于 2021-01-27 07:12:07
问题 Why is the onload event never fired in following snippet? var img = new Image() img.onload = function() { alert("ok"); } var svg = '<svg height="100" width="100"><circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" /></svg>' img.src = 'data:image/svg+xml;base64,'+ btoa(svg); Link to jsfiddle: https://jsfiddle.net/venmmn3b/1/ 回答1: Because it is NOT ok - missing quote in your svg string the image triggers the error and not the load handler var img = new Image() img.onload =

Image onload not called when setting source

由 自作多情 提交于 2021-01-27 07:10:59
问题 Why is the onload event never fired in following snippet? var img = new Image() img.onload = function() { alert("ok"); } var svg = '<svg height="100" width="100"><circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" /></svg>' img.src = 'data:image/svg+xml;base64,'+ btoa(svg); Link to jsfiddle: https://jsfiddle.net/venmmn3b/1/ 回答1: Because it is NOT ok - missing quote in your svg string the image triggers the error and not the load handler var img = new Image() img.onload =
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