What is the preferred way to achieve a multi style text paragraph (without a fixed structure)?
I was thinking about extending the RichTextField with a b and c classes?
p {
font-size: 20px;
}
.a {
font-size: 200%;
color: red;
font-wight: bold;
}
.b {
font-size: 80%;
color: blue;
}
.c {
font-size: 140%;
color: green
}
<p>
<span class="a">Multi</span>style
<span class="b">Site</span>
<span class="c">claim</span>
are terrible, but necessary.
</p>
I believe you are looking for a StructBlock. However, I would make sure to ask: what are you using these different colored text fields for? Wagtail might already have a predefined field for your use case, such as a BlockQuoteBlock. If not, you can make your own block.
In your app model, you would add a block class that looks something like this:
class ParagraphBlock(blocks.StructBlock):
red_paragraph = blocks.TextBlock(required=False)
blue_paragraph = blocks.TextBlock(required=False)
green_paragraph = blocks.TextBlock(required=False)
class Meta:
icon = 'text'
# if desired, you can add a block template
# template = 'paragraph_block.html'
If you need more customization, you can also create a custom template for the block.
See also the answer to this question, which is similar to what you are looking for.
Related
I wrote a Google Chrome extension, which popups a dialog with an autocomplete field and it's own style, but there are some sites where my CSS gets totally broken, which doesn't look very nice.
I know about isolating styles with iFrames, but in Google Chrome extension there is no way to isolate my HTML and CSS in this way. Another method is to wrap all my stuff into a separated div with it's own id and relative styles for that id, and I do so, but it seems that it doesn't work on some sites with "hard" tags style overloading or "!important" directives in the CSS code.
So, I want to know is there any way to really isolate my styles in z convenient way or it's my bad carma to overload every little CSS property to fix one or another style issue for each site?
By the way: I set up my manifest to load all the things at the "document_end", but I see it's not being applied to the stylesheets which is every time loaded whenever the DOM is ready.
At the time of asking the question, your only option was to either use iframes, or stylesheets with a very high specificity and explicitly set all properties that might affect styles. The last method is very cumbersome, because there will always be some property that is overlooked by you. Consequently, the only usable method for isolating stylesheets was to use iframes.
The solution to this problem -isolation of styles without iframes- is Shadow DOM (since Chrome 25). You can find a tutorial at HTML5 Rocks. For a real-world Chrome extension that uses Shadow DOM to isolate styles, see Display #Anchors (source code here).
As I've recently gone through the gauntlet of this issue, I want to share some information I think is valuable.
First, Rob W's answer is correct. Shadow DOM is the correct solution to this problem. However, in my case not only did I need CSS isolation, I also needed JavaScript events. For example, what happens if the user clicks a button that lives within the isolated HTML? This gets really ugly with just Shadow DOM, but we have another Web Components technology, Custom Elements, to the rescue. Except that as of this writing there is a bug in chrome that prevents custom element in chrome extensions. See my questions here and here and the bug here.
So where does that leave us? I believe the best solution today is IFrames, which is what I went with. The article shahalpk linked is great but it only describes part of the process. Here's how I did it:
First, create an html file and js file for your isolated widget. Everything inside these files will run in an isolated environment in an iframe. Be sure to source your js file from the html file.
//iframe.js
var button = document.querySelector('.my-button');
button.addEventListener('click', function() {
// do useful things
});
//iframe.html
<style>
/* css */
</style>
<button class='my-button'>Hi there</button>
<script src='iframe.js'></script>
Next, inside your content script create an iframe element in javascript. You need to do it in javascript because you have to use chrome.extension.getURL in order to grab your iframe html file:
var iframe = document.createElement('iframe');
iframe.src = chrome.extension.getURL("iframe.html");
document.body.appendChild(iframe);
And that's it.
One thing to keep in mind: If you need to communicated between the iframe and the rest of the content script, you need to chrome.runtime.sendMessage() to the background page, and then chrome.tabs.sendMessage from the background page back to the tab. They can't communicate directly.
EDIT: I wrote a blog post detailing everything I learned through my process, including a complete example chrome extension and lots of links to different information:
https://apitman.com/3/#chrome-extension-content-script-stylesheet-isolation
In case my blog goes down, here's the sources to the original post:
Blog post
Example source
Either use all
.some-selector {
all: initial;
}
.some-selector * {
all: unset;
}
or use Shadow DOM
Library
function Widget(nodeName, appendTo){
this.outer = document.createElement(nodeName || 'DIV');
this.outer.className = 'extension-widget-' + chrome.runtime.id;
this.inner = this.outer.createShadowRoot();
(appendTo || document.body).appendChild(this.outer);
}
Widget.prototype.show = function(){
this.outer.style.display = 'block';
return this;
};
Widget.prototype.hide = function(){
this.outer.style.display = 'none';
return this;
};
Usage
var myWidget = new Widget();
myWidget.inner.innerHTML = '<h1>myWidget</h1>';
You can access the widget contents via myWidget.inner and the outer via myWidget.outer.
Styles
/*
* Reset Widget Wrapper Element
*/
.extension-widget-__MSG_##extension_id__ {
background: none;
border: none;
bottom: auto;
box-shadow: none;
color: black;
cursor: auto;
display: inline;
float: none;
font-family : "Helvetica Neue", "Helvetica", "Arial", sans-serif;
font-size: inherit;
font-style: normal;
font-variant: normal;
font-weight: normal;
height: auto;
left: auto;
letter-spacing: 0;
line-height: 100%;
margin: 0;
max-height: none;
max-width: none;
min-height: 0;
min-width: 0;
opacity: 1;
padding: 0;
position: static;
right: auto;
text-align: left;
text-decoration: none;
text-indent: 0;
text-shadow: none;
text-transform: none;
top: auto;
vertical-align: baseline;
white-space: normal;
width: auto;
z-index: 2147483648;
}
/*
* Add your own styles here
* but always prefix them with:
*
* .extension-widget-__MSG_##extension_id__
*
*/
.extension-widget-__MSG_##extension_id__{
position: fixed;
top: 100px;
margin: 0 auto;
left: 0;
right: 0;
width: 500px;
}
.extension-widget-__MSG_##extension_id__::shadow h1 {
display: block;
margin: 0 auto;
padding: 20px;
background-color: yellow;
border: 10px solid green;
font-size: 20px;
text-align: center;
}
I recently created Boundary, a CSS+JS library to solve problems just like this. Boundary creates elements that are completely separate from the existing webpage's CSS.
Take creating a dialog for example. After installing Boundary, you can do this in your content script
var dialog = Boundary.createBox("yourDialogID", "yourDialogClassName");
Boundary.loadBoxCSS("#yourDialogID", "style-for-elems-in-dialog.css");
Boundary.appendToBox(
"#yourDialogID",
"<button id='submit_button'>submit</button>"
);
Boundary.find("#submit_button").click(function() {
// some js after button is clicked.
});
Elements within #yourDialogID will not be affected by the existing webpage. And find() function returns a regular jQuery DOM element so you can do whatever you want with it.
Hope this helps. Please let me know if you have any question.
https://github.com/liviavinci/Boundary
Use iframes. It's a workaround, but works fine.
Maxime has written an article on it.
I wrote a Google Chrome extension, which popups a dialog with an autocomplete field and it's own style, but there are some sites where my CSS gets totally broken, which doesn't look very nice.
I know about isolating styles with iFrames, but in Google Chrome extension there is no way to isolate my HTML and CSS in this way. Another method is to wrap all my stuff into a separated div with it's own id and relative styles for that id, and I do so, but it seems that it doesn't work on some sites with "hard" tags style overloading or "!important" directives in the CSS code.
So, I want to know is there any way to really isolate my styles in z convenient way or it's my bad carma to overload every little CSS property to fix one or another style issue for each site?
By the way: I set up my manifest to load all the things at the "document_end", but I see it's not being applied to the stylesheets which is every time loaded whenever the DOM is ready.
At the time of asking the question, your only option was to either use iframes, or stylesheets with a very high specificity and explicitly set all properties that might affect styles. The last method is very cumbersome, because there will always be some property that is overlooked by you. Consequently, the only usable method for isolating stylesheets was to use iframes.
The solution to this problem -isolation of styles without iframes- is Shadow DOM (since Chrome 25). You can find a tutorial at HTML5 Rocks. For a real-world Chrome extension that uses Shadow DOM to isolate styles, see Display #Anchors (source code here).
As I've recently gone through the gauntlet of this issue, I want to share some information I think is valuable.
First, Rob W's answer is correct. Shadow DOM is the correct solution to this problem. However, in my case not only did I need CSS isolation, I also needed JavaScript events. For example, what happens if the user clicks a button that lives within the isolated HTML? This gets really ugly with just Shadow DOM, but we have another Web Components technology, Custom Elements, to the rescue. Except that as of this writing there is a bug in chrome that prevents custom element in chrome extensions. See my questions here and here and the bug here.
So where does that leave us? I believe the best solution today is IFrames, which is what I went with. The article shahalpk linked is great but it only describes part of the process. Here's how I did it:
First, create an html file and js file for your isolated widget. Everything inside these files will run in an isolated environment in an iframe. Be sure to source your js file from the html file.
//iframe.js
var button = document.querySelector('.my-button');
button.addEventListener('click', function() {
// do useful things
});
//iframe.html
<style>
/* css */
</style>
<button class='my-button'>Hi there</button>
<script src='iframe.js'></script>
Next, inside your content script create an iframe element in javascript. You need to do it in javascript because you have to use chrome.extension.getURL in order to grab your iframe html file:
var iframe = document.createElement('iframe');
iframe.src = chrome.extension.getURL("iframe.html");
document.body.appendChild(iframe);
And that's it.
One thing to keep in mind: If you need to communicated between the iframe and the rest of the content script, you need to chrome.runtime.sendMessage() to the background page, and then chrome.tabs.sendMessage from the background page back to the tab. They can't communicate directly.
EDIT: I wrote a blog post detailing everything I learned through my process, including a complete example chrome extension and lots of links to different information:
https://apitman.com/3/#chrome-extension-content-script-stylesheet-isolation
In case my blog goes down, here's the sources to the original post:
Blog post
Example source
Either use all
.some-selector {
all: initial;
}
.some-selector * {
all: unset;
}
or use Shadow DOM
Library
function Widget(nodeName, appendTo){
this.outer = document.createElement(nodeName || 'DIV');
this.outer.className = 'extension-widget-' + chrome.runtime.id;
this.inner = this.outer.createShadowRoot();
(appendTo || document.body).appendChild(this.outer);
}
Widget.prototype.show = function(){
this.outer.style.display = 'block';
return this;
};
Widget.prototype.hide = function(){
this.outer.style.display = 'none';
return this;
};
Usage
var myWidget = new Widget();
myWidget.inner.innerHTML = '<h1>myWidget</h1>';
You can access the widget contents via myWidget.inner and the outer via myWidget.outer.
Styles
/*
* Reset Widget Wrapper Element
*/
.extension-widget-__MSG_##extension_id__ {
background: none;
border: none;
bottom: auto;
box-shadow: none;
color: black;
cursor: auto;
display: inline;
float: none;
font-family : "Helvetica Neue", "Helvetica", "Arial", sans-serif;
font-size: inherit;
font-style: normal;
font-variant: normal;
font-weight: normal;
height: auto;
left: auto;
letter-spacing: 0;
line-height: 100%;
margin: 0;
max-height: none;
max-width: none;
min-height: 0;
min-width: 0;
opacity: 1;
padding: 0;
position: static;
right: auto;
text-align: left;
text-decoration: none;
text-indent: 0;
text-shadow: none;
text-transform: none;
top: auto;
vertical-align: baseline;
white-space: normal;
width: auto;
z-index: 2147483648;
}
/*
* Add your own styles here
* but always prefix them with:
*
* .extension-widget-__MSG_##extension_id__
*
*/
.extension-widget-__MSG_##extension_id__{
position: fixed;
top: 100px;
margin: 0 auto;
left: 0;
right: 0;
width: 500px;
}
.extension-widget-__MSG_##extension_id__::shadow h1 {
display: block;
margin: 0 auto;
padding: 20px;
background-color: yellow;
border: 10px solid green;
font-size: 20px;
text-align: center;
}
I recently created Boundary, a CSS+JS library to solve problems just like this. Boundary creates elements that are completely separate from the existing webpage's CSS.
Take creating a dialog for example. After installing Boundary, you can do this in your content script
var dialog = Boundary.createBox("yourDialogID", "yourDialogClassName");
Boundary.loadBoxCSS("#yourDialogID", "style-for-elems-in-dialog.css");
Boundary.appendToBox(
"#yourDialogID",
"<button id='submit_button'>submit</button>"
);
Boundary.find("#submit_button").click(function() {
// some js after button is clicked.
});
Elements within #yourDialogID will not be affected by the existing webpage. And find() function returns a regular jQuery DOM element so you can do whatever you want with it.
Hope this helps. Please let me know if you have any question.
https://github.com/liviavinci/Boundary
Use iframes. It's a workaround, but works fine.
Maxime has written an article on it.
In here we have boxes which can have children. If you click on a box, it will add a child for it.
https://codesandbox.io/s/suspicious-fire-e2jes
What I struggle to understand is why does it take increasingly long to create a child as the max depth increases?
According to performance audit, the problem is not in the data structure format where you define parent for a node, rather than defining all children for a node.
So the issue is layout. From what I could find, one anti-pattern is where you read-write-read-write styles over and over which forces browser to calculate layout before each read. I don't see anything of this sort in my code.
The issue is definitely layout. But not your layout.
I tried your code without loading your style.css file.
And it works as expected.
I created a similar use case without react. Pure css here with same dom structure:
const node = (id, children) => `
<div class='node'>${id}</div>
<div class='children'>
<div class='nodeAndChildren'>
${children}
</div>
</div>
`
document.getElementById("app").innerHTML = `
<div class='nodeAndChildren'>
${node(0, node(1, node(2, node(3, node(4, node(5, node(6, node(7, 'end'))))))))}
</div>
`;
.App {
font-family: sans-serif;
text-align: center;
}
.nodeAndChildren {
display: grid;
grid-auto-flow: column;
}
.node {
width: 100px;
border: 1px solid black;
}
.children {
display: grid;
}
<div id='app'/>
You can see how slow this is, even here.
This seems like a weird pattern matching issue for css or grid layout.
So, i tried it only with inline styling, was still slow
https://codesandbox.io/embed/displaygrid-bug-bcgsm
My suggestion is to use css columns instead of grid. Or just flex boxes with wrap.
I've been trying to use styled-components with the alpha version of material-ui
According to the documentation, this should work out of the box.
This code:
const StyledButton = styled(Button)`
color: red;
text-transform: uppercase;
`;
return <StyledButton>Button</StyledButton>;
will generate something like this:
<button tabindex="0" class="MuiButtonBase-root-3177716317 sc-bdVaJa sxRGN" type="button" role="button">
...
</button>
It looks good.
However, the only problem I have is the order of the injected CSS styles (pic). Styles from styled-components are injected before MUI's styles which make their priority lower.
Is there any way to solve this without using !important?
In the current release (i.e. non-alpha) version, what you've asked would indeed require !important basis:
"Note that CSS properties defined inline are given priority over those defined in a CSS class. You need to use !important to take precedence over the inline style."
Ref: http://www.material-ui.com/#/customization/styles
Perhaps the alpha hasn't quite moved away from this inline requirement yet or it is still a work-in-progress.
What I've done to overcome this sort of thing myself is to (unfortunately) recreate the entire CSS on a standard <button> element when I need such a solution. Here's an example of how I'm doing that with a react-photonkit "theme"
// #flow
import styled from 'styled-components';
const PhotonStyledButton = styled.button`
font-family: Arial, Roboto, Helvetica, sans-serif;
height: 30px;
display: inline-block;
padding: 6px 12px;
margin-bottom: 0;
font-size: 12px !important;
line-height: 1.4;
text-align: center;
white-space: nowrap;
vertical-align: middle;
cursor: default;
background-image: none;
border: 1px solid transparent;
border-radius: $default-border-radius;
box-shadow: 0 1px 1px rgba(0,0,0,.06);
-webkit-app-region: no-drag;
&:focus {
outline: none;
box-shadow: none;
}
color: #333;
border-top-color: #c2c0c2;
border-right-color: #c2c0c2;
border-bottom-color: #a19fa1;
border-left-color: #c2c0c2;
background-color: #fcfcfc;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#fcfcfc), color-stop(100%,#f1f1f1));
background-image: -webkit-linear-gradient(top, #fcfcfc 0%, #f1f1f1 100%);
background-image: linear-gradient(to bottom, #fcfcfc 0%, #f1f1f1 100%);
&:active {
background-color: #ddd;
background-image: none;
}
`;
export default PhotonStyledButton;
styled-components in general is compatible with any component library. When you write styled(AnotherComponent) we take that component and inject an automatically generated class name. This means essentially it's the same thing as writing <AnotherComponent className="sc-asdf123" />!
The current version of material-ui specifically is a bit difficult to custom style because it uses inline styles. From the MaterialUI documentation:
Note that CSS properties defined inline are given priority over those defined in a CSS class. You need to use !important to take precedence over the inline style.
This means simply using styled(MaterialButton) won't work as the passed-in styles will mostly just be ignored. You need to bump the specificity of your styles to override the inline styles that material-ui ships with. (this article is a great primer on specificity if you're not familiar with the details)
Answer for the alpha version of material-ui
The current alpha version of material-ui has switched to using JSS under the hood. (which is CSS in JS not inline styles, like styled-components) This means the issue is likely to be that the styled-components styles are injected after the default material-ui styles. (which are injected by JSS)
JSS supports custom injection points so you might be able to add a <!-- jss --> comment to the HEAD of your HTML to make sure JSS injects its CSS before the styled-components injected CSS?
Answer for the current version of material-ui
There are two ways to bump the specificity of the styled-components injected styles, one more tedious and one a bit more "hacky". The first one is adding !important at the end of all of your styles:
const Button = styled(MaterialButton)`
color: blue!important;
`
While this works in most cases it gets tedious very fast when you have lots of custom styling in a component. The better way is to use the class name hack:
const Button = styled(MaterialButton)`
&&& {
color: blue;
}
`
These ampersands get replaced with the automatically generated class name meaning the outputted CSS looks something like this:
.sc-asdf123.sc-asdf123.sc-asdf123 {
color: blue;
}
This bumps specificity by a big margin, thusly overriding the defined inline styles, and is less annoying than having to put !important after each rule.
Now we can use <!-- material-ui --> to make sure the styles are injected after it.
By default, Material-UI will look for a html comment named to inject styles after. By adjusting the placement of this comment within your HTML body you can control the order that CSS rules are applied to your components. (ref)
I want to disable my navigation item using this code:
md-nav-bar
md-nav-item A
md-nav-item(ng-disabled=false) B
However, it doesn't work. Looking for the docs but couldn't find anything. How to disable navigation item in correct way?
I tried but couldn't find a proper way and didn't have to time to submit a pull/merge request (IF I could fix it that is). I did managed to get a work-around working, which basically intercepts and stops the click from propagating up to be handled by the mb-nav-item:
<md-nav-item md-nav-click="AppCtrl.gotoPage(1)" name="page-1">
<span ng-click="AppCtrl.gotoPageBlocker(1, $event)">Loan Details</span>
</md-nav-item>
Then in you controller/whatever, just define the gotoPageBlocker() like so:
function gotoPageBlocker(pageNo, theEvent) {
if (!userCanAccessPage(pageNo)) {
theEvent.preventDefault();
theEvent.stopPropagation();
}
}
This will intercept and either block or allow the click event to bubble up to the md-nav-item. Not the best way as using ng-disabled would be SOOO much easier + would have saved me a few hours mucking around, but it works for now. This will screw up the css a bit, so below is my "attempt" at making things look nice in css (well, scss):
.md-nav-item {
/**
* We need to move the margin and padding from the parent buttong to the child
* span. This is so the span intercepts the click from the whole area
*/
.md-button {
margin: 0px !important;
padding: 0px !important;
._md-nav-button-text span {
line-height: 24px;
margin: 0 4px;
padding: 12px 16px;
display: block;
outline: none;
}
}
/**
* This targets the unselected disabled button
*/
&[disabled] .md-button._md-nav-button.md-unselected {
color: #ff0000;
cursor: inherit;
}
}