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Diagram with custom Node - Image not shown first load (Read 13838 times)

Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Diagram with custom Node - Image not shown first load Apr 7^th, 2017 at 12:41pm	Print Post
	I have created a custom node containing couple of text and images, and was working fine, but the nodes started to load with the text only, and the images is not there, until I click on the node, then the images appeared. I don't know If it is because something I did or some property I changed. I checked the console in Chrome, the function "updateCanvasElements" already called and the images are pushed. I tested on IE, everything is okay as usual. I searched, but nothing I could found or someone having the same problem. Any Ideas? Hin?
	« Last Edit: Apr 7^th, 2017 at 2:04pm by Ghaith »

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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #1 - Apr 7^th, 2017 at 3:47pm	Print Post
	The DOM image might have not downloaded yet the first time you try to draw it. You could check the image.complete property, and if it's false call diagram.repaint() to schedule a redraw. You could as well subscribe to the image.load event. That's similar to what was discussed in this thread - http://mindfusion.eu/Forum/YaBB.pl?num=1488530760/15#15


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #2 - Apr 7^th, 2017 at 6:32pm	Print Post
	Dear this is the code I am using //Add image var imgFile = new Image(); imgFile.src = 'data:image/png;base64,' + f.value; imgFile.addEventListener("load", function () { }); var img = new MindFusion.Drawing.Image( new MindFusion.Drawing.Rect(this.bounds.x + p.position_X, this.bounds.y + p.position_Y, p.width, p.height)); img.image = imgFile; img.loaded = imgFile.complete; this.graphicsContainer.content.push(img); but this didn't help


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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #3 - Apr 8^th, 2017 at 11:43am	Print Post
	Try this handler - Code imgFile.addEventListener("load", function () { img.loaded = true; node.invalidate(); }); Regards, Slavcho Mindfusion


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #4 - Apr 10^th, 2017 at 1:44pm	Print Post
	That solved the problem. Many thanks


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #5 - Jun 1^st, 2017 at 4:09pm	Print Post
	Dear, Previously I was using only 1 image per node and it worked correctly, but now I added multi image to same node. 3 images in my case used as buttons. My Issue is that the first 2 images is not shown on the node on the first load, unless I select the node - I think a repaint function executed -, but the last image shown directly and no problem in it. any ideas


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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #6 - Jun 1^st, 2017 at 6:32pm	Print Post
	Have you also added similar load event handlers for them to repaint the node when image is downloaded?


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #7 - Jun 2^nd, 2017 at 2:35pm	Print Post
	yes, I have the same way for all images here is my code, where I am doing a loop for all the fields stored in the node Tag, and I tried to pass the image src as base64 and another time as a link, and always only the last one pushed is the one that appears normally. Note: This issue happened on Google chrome, but not on IE. Code for (var i = 0; i < this.tag.fields.length; i++) { var f = this.tag.fields[i]; var p = f.fieldPattern; if (p != null) { if (f.isImage) { //Add image var imgFile = new Image(); imgFile.src = f.value; var img = new MindFusion.Drawing.Image( new MindFusion.Drawing.Rect(this.bounds.x + p.position_X, this.bounds.y + p.position_Y, p.width, p.height)); img.image = imgFile; img.loaded = imgFile.complete; imgFile.addEventListener("load", function () { img.loaded = true; if (this.parent) this.invalidate(); }); this.graphicsContainer.content.push(img); } else { //add label } }


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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #8 - Jun 5^th, 2017 at 8:04am	Print Post
	Have you verified the code calls content.push(img) more than once, and that the image positions are different? Working under IE but not Chrome sounds strange - try clearing Chrome's cache in case it's using older version of your script, and check if there are error shown in console.


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #9 - Jun 5^th, 2017 at 11:45am	Print Post
	Content.Push(img) is called for every image, and the positions are different, if you prefer I can send you a screen recording presenting the issue?


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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #10 - Jun 5^th, 2017 at 1:07pm	Print Post
	Please attach a test project that reproduces it.


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #11 - Jun 6^th, 2017 at 7:04pm	Print Post
	Dear, I couldn't attach the project here, please check the following link, I uploaded it to DropBox https://www.dropbox.com/s/ndg1wx6v7qygkhe/ImageLoadingTest.rar?dl=0


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Slavcho YaBB Moderator Offline tech.support Posts: 3444 Joined: Oct 19^th, 2005	Re: Diagram with custom Node - Image not shown first load Reply #12 - Jun 7^th, 2017 at 1:36pm	Print Post
	The problem is 'this' in nested function does not refer to the node but to the global window object. You will need to remember it in closure - Code var This = this; imgFile.addEventListener("load", function () { img.loaded = true; if (This.parent) This.invalidate(); }); Also updateCanvasElements itself does not seem best place to create and load image objects. Instead load them from constructor or from the fromJson overload, saving all images in an array, and then only add the already-loaded array elements when updateCanvas is called. Regards, Slavcho


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Ghaith YaBB Newbies Offline I Love MindFusion! Posts: 21 Joined: Apr 7^th, 2017	Re: Diagram with custom Node - Image not shown first load Reply #13 - Jun 8^th, 2017 at 3:43pm	Print Post
	changing the this did the work. thanks a lot for your support


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