Pretty straightforward problem. Have scroll-able ion-content in my Ionic4 application. I want to be able to print it gracefully by applying #media only print styles. I'm almost there, but I have one major problem. I cannot get the vertical scrollbar to disappear for printing. Additionally, I only ever get one page printed, containing only the content that is in view when I print the page. I've scoured the web for solutions, and come across and tried various suggestions in the context of Ionic3 and earlier, but I haven't found the magic bullet for Ionic4 yet. Has anyone encountered and gotten to the bottom of this yet?
I have been through the ringer on trying to print content in Ionic 4. Some of the steps i followed to print multiple pages.
remove any flex-box styled lists. They just will not print how you want them to across pages, though they have worked fine for me if the content fits in a page.
for items you want to be seperated by page, its best if they are a display: block; styled item, so that that in the print style sheet you can use one of the page-break properties on it
on the item containing your list, the ion-content for example, make sure you remove any max-height attributes from it or any of its ancestor or child elements, as well as removing the overflow: scroll from these elements as well so that it allows your content to go from page to page. for example on my stylesheet for printing (cant share it because of NDAs) I had a lot of overflow-y: visible on elements just to make sure it shows. if you find an element thats cutting off your html, it should be the primary target for experimentation.
you can simulate a print in the dev tools, i found it useful, it's good for iteration here's a link
some other things that may help, but i am not sure as I did so much testing across browsers, and only vaguely remember what impact that css property had is to have the body with a static position, as well as having contain: none on the body to say that the browser should render as normal, little more explanation here
i do not know the specifics of your use case, but if you don't mind foregoing the native print button, and just giving the user a button to click to trigger the print, then that would be more manageable as you do not have to account for all the scaffolding around that specific element that you want to print (the ion-router, ion-page, and all the ancestors)
If you did that then you could put all your items you want to print into a div with an id of printSection or what you prefer, and then the javascript that is responsible for that page you can create your own print function. In my example i will use angular, if you are not using that then preform whatever DOM selecting you need to to get the native html out of your template.
#Component({ ... })
export class Page {
// select the item holding your print content by `#property` you gave it
#ViewChild('printSection', { read: ElementRef }) printSection: ElementRef;
...
customPrint() {
const printContent = this.printSection.nativeElement;
const WindowPrt = window.open('', '', 'left=0,top=0,width=900,height=900,toolbar=0,scrollbars=0,status=0');
WindowPrt.document.write(printContent.innerHTML); // pass in the native html you got
/**
* you should probably use an observable instead of an interval for this,
* but this is just to illustrate a bug where the print would be fired before
* all the content was written
*/
const interval = setInterval(
() => {
if (document.readyState === 'complete') {
WindowPrt.document.close();
WindowPrt.focus();
WindowPrt.print();
clearInterval(interval);
}
},
200);
}
}
I Solved it following this process
First, remove the content to be printed from ion-content. Use a div instead of ion-content(shadow-dom is implemented with ion-content which blocks your CSS classes)
You also need to force the CSS below on ion-page when printing (it is initially set to position: absolute, by default)
In my case I was printing from a modal component which has a default class "show-modal". I was able to print on multiple pages by target that class this way
#media print {
.ion-page {
left: 0;
right: 0;
top: 0;
bottom: 0;
display: block;
position: relative;
flex-direction: column;
justify-content: space-between;
contain: none;
overflow: visible;
z-index: 0;
}
.scroll-content,
ion-modal.show-modal,
ion-modal.show-modal .modal-wrapper,
ion-modal.show-modal .ion-page.show-modal,
ion-modal.show-modal .ion-page.show-modal > ion-content,
.ion-page.show-modal,
.ion-page.show-modal > ion-content,
ion-tab,
ion-tabs,
.app-root,
body {
contain: none;
position: relative !important;
height: auto;
overflow: visible;
}
}
I'm also trying to solve this same issue. I've scoured the Internet, and tried many an idea, but none has worked so far.
Perhaps we could solve this collaboratively. I'd put this as a comment, but I don't have enough rating points, so the system will not let me.
This is what I've found so far. In Chrome Developer Tools, you can click on a settings icon, then scroll to "Rendering," and on "Emulate CSS media type," select "print."
When I do that, it shows what the print view is. I created a separate css file, let's call it print.css, and in it, there is
#media print {
/* add your css styles for print here */
}
I know my print.css is being processed because I've
display: none
for ion-header and some tabs at the bottom, and they do disappear when I select "print" emulation in Chrome.
What is interesting is, I'm seeing the whole page -- scrollable and all -- on the screen in this print mode. However, every time I try to print it, only one page shows up.
That page, however, doesn't always start at the top. It includes the current viewport.
Which is why, I'm wondering if there is something in the css that is trying to keep the whole thing as a page. i.e., preventing a page break?
I'm experimenting with things like this:
ion-content, .foo, .bar, ion-list, ion-tabs, ion-item {
break-inside : auto !important;
break-after : auto !important;
break-before : auto !important;
}
(where foo and bar are classes you might have of your own.)
This above one breaks things. Removing ion-tabs, ion-list, and ion-item shows the full page.
I'm also experimenting with the following. None has worked so far, but that is probably because I haven't selected the right tag or class.
display: block !important;
height: 100%;
overflow-y: visible !important;
max-height: unset !important;
contain: none;
You may want to experiment with the tag in question that might be preventing a page break. Some people are suggesting it's flexbox or grid that's the root cause. I'd love to know how to find the root cause.
Good luck! If something works, let us know, so I'll also try it in my code.
I have a container in the center of window. And my logo goes out from container to the left. I split my logo in 2 pieces. Right piece i added in my container with no-repeat. And left piece i have to add in my body background and somehow stick it to containers div.
i have drawn my issue:
how to manage that issue ?
I would do it somehow different. You can always set background of #logoimage div to your logo with gradient, or simply put an image inside. One image is enough with full logo object.
style:
#container{
display:block;
width:400px;
height:800px;
margin:auto;
background:#abc;
position:relative;
}
#logoimage{
display:block;
width:170px;
height:80px;
margin:auto;
background:#aaa;
position:absolute;
left:-70px;
top:30px;
}
html:
<div id="container"><div id="logoimage"></div></div>
live example here
What's the most important of this is:
position:relative style of container element
position:absolute style of logo element
The idea generally is that in position absolute, you can set x,y relatively to element with position relative.
I want to display a ListView in WinJS which never shows it's own scroll bar. I want it instead to grow horizontally into its parent container. The way in which I've implement it is basically by setting the min-width css property on the ListView. On initial load, this works flawlessly. When additional data is loaded into the backing data source (a WinJS.Binding.List in this case), I expect the ListView to draw the elements and resize itself. Instead, the ListView draws the elements and adds its own scroll horizontal bar. After about a second or two, suddenly the ListView is resized automatically and fits into the parent container.
How can I have this resize happen immediately after elements have been added? Force layout won't work because it redraws every single item and I am populating a lot of elements into this ListView.
I agree with Dominic, that you should try to listen to the loadingStateChanged event on the listview control. There is a chance that it won't fire immediately, in which case i would show the progress element over your list and wait for it to redraw, then remove the progress.
I used a technique I found on how to detect overflow on a div. Basically, after I add all the new data items, I ensure that increase the size of the ListView's parent div until the ListView div doesn't have overflow anymore.
Edit: so in the end I decided against this strategy because of the advice as a result of this post. I looked at the built in Grid project template and figured out how to ensure that the list view fits in the whole screen properly. I used the following CSS.
#listid{
height: 100%;
position: relative;
width: 100%;
z-index: 0;
}
#section[role=main]{
margin-left: 0;
}
#listid .win-horizontal.win-viewport .win-surface {
margin-left: 120px;
margin-right: 115px;
}
Working URL:
http://webstage.co/scroll/stack.html
What I am trying to accomplish is to hide the content when it is outside of the background area (1280x800). I like the way the backgrounds are coming in when you scroll to a new section, but I want to hide the content until it gets into that 1280x800 viewport? Any suggestions on how I can accomplish this?
Bonus...It would be great if I could also hide the content under the top navigation once it scrolled up under it as well. A guy can dream. :)
Thanks!
For the first part you can add another div and target with css something like this:
.viewport {
width: 1280px;
height: 100%;
position: fixed;
top: 0;
left: 50%;
margin-left: -640px;
background: black;
clip: rect(800px, 1280px, auto, auto);
}
Basically, set the background to the same color as the page background and use clip to only display the portion of the div that sits below your desired viewport area hiding the content outside the viewport area.
If you add content to the footer later you may need to tweak some z-index settings to make sure it sits on top of the viewport div.
I was trying to add twitter/facebook icon to the site footer, much like side.cr footer. I got everything working, except that safari having unexpected vertical tile for twitter and facebook. I tried to upload screenshot but I am new user, so can't do that right now.
So I was searching for the answer and found this q/a here, Is <img> element block level or inline level?
So I went to side.cr again to see its css does have user agent stylesheet.
I added this line of code to my css:
.footer ul li img.t, li img.f {
width: 40px;
vertical-align: middle;
display: inline-block;
}
and it fixed the problem.
But I have a few questions in head:
why does side.cr's css show as non-editable user agent, while I have to add that display-inline to my css?
How does "display: inline-block" fix the problem?
Notice that: When mouse over to the gray twitter, it triggers swap.js, changing the icon image to the colored one, but in safari, the highlighted icon is bigger than the gray one. I think i almost know the answer. Just need someone who knows all the kinks behind this.
Thanks!
Solution:
To fix this problem make sure you set the height and width on the image so that it doesn't change during loading.
<img src="http://www.side.cr/images/contact/twitter_off.svg"
class="twitter_bird img_swap" height="52px" width="52px" />
or
.twitter_bird {
height:50px;
width:50px
}
Explanation:
When you switch the images name, safari begins to load the image but it doesn't know the height or width until it's done downloading. If you set the height and width it will not grow from 0px to 52px.