I'm trying to filter any text through angular to return a font-awesome icon. Instead It's just returning plain text. Anyone know a fix? Thanks!
.filter('textToIcon', function($sce) {
return function(text) {
if(text!==''){
return '<i class="fa fa-child"></i>';
}
}
This is "Strict Conceptual Escaping" (SCE) in action.
For more information on what it is and how it works, take a look at this answer.
In a few words, Angular tries to protect your users from untrusted content that could do bad things to them. If you know that the values are safe to be interpreted as HTML, there are two approaches you can take:
Import ngSanitize (it is available as a separate module) and add it as a dependency in your module (e.g. angular.module('myApp', ['ngSanitize'])). You are set (as long as you pass safe values to ngBindHtml) !
Use $sce to specify that certain stuff is explicitly trusted (by you) to be used as HTML:
.filter('textToIcon', function ($sce) {
return function (text) {
if (text) {
return $sce.trustAsHtml('');
}
};
})
The former approach is strongly recommended !
Related
I want to use a java-script method in a polymer Template. I am using Vaadin with Polymer Elements. In my Project I have a Vaadin-Grid of Objects that can be of different type. I want to render these types with different Templates.
This problem can be solved with a dom-if template, as described by ollitietavainen in this answer
This works perfectly, but there is a problem. When using more than two different Types of Objects in the Grid, one would need to use the same amount of booleans to set that up. Suppose we have a fictional shop that displays PC-Parts, and each type of PC-Part needs to be rendered with its own template, then we would need something like the fallowing. This is quite cumbersome.
private boolean isMemory(AbstractPcPart pcPart) {
return pcPart.getClass().equals(Memory.class);
}
private boolean isGraphicsCard(AbstractPcPart pcPart) {
return pcPart.getClass().equals(GraphicsCard.class);
}
private boolean isCPU(AbstractPcPart pcPart) {
return pcPart.getClass().equals(CPU.class);
}
// … is-checker for all other types of pcParts.
private void initColumn() {
addColumn(Objects.requireNonNull(CardFactory.getTemplate())
.withProperty("partCard", CardFactory::create)
.withProperty("isMemory", this::isMemory)
.withProperty("isGraphicsCard", this::isGraphicsCard)
.withProperty("isCPU", this::isCPU)
// add all other properties
);
}
The corresponding Templates would look something like this.
<template is='dom-if' if='[[item.isMemory]]'>"
<memory-card part-card='[[item.partCard]]'>
</memory-card>"
</template>
<template is='dom-if' if='[[item.isGraphicsCard]]'>"
<graphics-card part-card='[[item.partCard]]'>
</graphics-card-card>"
</template>
<template is='dom-if' if='[[item.isCPU]]'>"
<cpu-card part-card='[[item.partCard]]'>
</cpu-card>"
</template>
<!-- one additional template for every type of part -->
The question now is, if there is any other way, that would not be needing all these Properties.
Luckily there is, as Kuba Šimonovský explained in an answer to another question.
Using this method we could rewrite the code from above to something like the fallowing.
private String type(AbstractPcPart pcPart) {
return pcPart.getClass().getSimpleName();
}
private void initColumn() {
addColumn(Objects.requireNonNull(CardFactory.getTemplate())
.withProperty("partCard", CardFactory::create)
.withProperty("type", this::type));
}
This time we use a java-script method to conditionally select the corresponding template.
<template is='dom-if' if='[[_isEqualTo(item.type, "Memory")]]'>"
<memory-card part-card='[[item.partCard]]'>
</memory-card>"
</template>
<template is='dom-if' if='[[_isEqualTo(item.type, "GraphicsCard")]]'>"
<graphics-card part-card='[[item.partCard]]'>
</graphics-card-card>"
</template>
<template is='dom-if' if='[[_isEqualTo(item.type, "CPU")]]'>"
<cpu-card part-card='[[item.partCard]]'>
</cpu-card>"
</template>
<!-- one additional template for every type of part -->
The Polymer Template is a bit more complicated now, but on the java side, the code is much shorter, and possibly easier to maintain. There is probably still some overhead, as every template gets added to the dom. But in addition to that only the content from the templates that we want to see gets added to the dom.
I don’t think there is a better way to do this though.
So using this method, we need a java-script method called _isEqualTo. This method is not a standard method so we need to implement it ourselves. The implementation for this method is straightforward.
function _isEqualTo(one, other) {
return one == other;
}
But the answer from Kuba does not specify where to implement this method. I have tried to put the method in different places with no luck. The js console in my browser always complains that it can not find the method.
Digging a little bit deeper I found this Link. So maybe what i want to have is a global variable.
window._isEqualTo = function(one, other) {
return one == other;
}
But even with this change the same warning persists. What’s weird is that the function is visible in the interactive console in the developer tools. Setting a breakpoint in the java-script file that i have added the function; and calling the function in the console reveals that it is really the correct function that get’s called, leading me to beleave that the function gets initialized too late in the lifecycle of the application. Although I am not sure at all.
And because the function is not found, the grid in the view will be empty. It still shows the rows, but they don’t show content.
I really hope someone can help me out.
Here is a Git-Repository to reproduce my problem. The concerning views are the PartsDomIfView and the PartsDomIfElegantView.
Instead of using the deprecated TemplateRenderer, you could create a LitRenderer (v22+) and create a custom lit component that can be used there as your column's content. In there you could create complex logic based templates as a separate component, that can be better maintained.
I've tried to google my question but it makes me even more confused. My question is:
Here's the jQuery code:
$(document).ready(function() {
$(window).resize(function() {
if ($(this).width() < 200) {
$("p").css("color", "red");
} else {
$("p").css("color", "green");
}
});
}
Why do we write (this) and not ("this") ?
How do I know if (document) and (window) should be written with " " - and why's that?
Maybe you could link me somewhere that explains my issue. My code apparently works either way, I'm just curious about the why.
In JavaScript namespace, this is reserved [source].
The JavaScript object literal this refers to the inherited object from the present state in the current execution.
Another example of this we can see is when we are looping through an array and the object this would symbolize the current array object. You may, for example, see this.title, or this.description if we were iterating through a database array of blog posts.
this in jQuery refers to the inherited object. When we add the quotation marks, and it becomes a string, such as "this". This makes jQuery parse it as a DOM selector.
Then we are now looking for the HTML DOM selector <this>, which to my knowledge, does not actually exist in the accepted HTML syntax standards.
As otherwise stated, the concept of this will become tricky when you are working in other JavaScript environments, such as React or Angular. Within the context of a functional component, this becomes the state, such as handling user sessions.
I am trying to route between pages using basic if condition in Angular.
GoToHome() {
if(this.router.url=='/chat'){
console.log(this.router.url)
this.router.navigate(['login']);
} else {
this.router.navigate(['people']);
}
}
The problem is that the route chat isn't really correct, there are many pages in chat (chat\x , chat\y and many others) I want that it will work for all the pages in chat, but right now it doesn't work. If I write a specific route like chat\x it does work, but only for x. Is there a way to do it for all?
you can read and check Guards. Read about CanActivate method, maybe it will help you?
RouteGuards might do a better job of handling the redirects as per your requirement.
But a quick workaround would be to do a split() on the URL and compare for the chat part. Try the following
if(((this.router.url).split('/')[1]) === 'chat') {
// proceed
}
As other had said, best solution is to use Angular Guard https://medium.com/#ryanchenkie_40935/angular-authentication-using-route-guards-bf7a4ca13ae3.
Anyway to resolve your problem you can use startsWith() function which determines whether a string begins with the characters of a specified string.
GoToHome() {
if((this.router.url).startsWith('/chat'){
console.log(this.router.url)
this.router.navigate(['login']);
} else {
this.router.navigate(['people']);
}
}
I'm using handlebars and assemble with yeoman and gulp.
I want to have some globalized partials that are able to be nested or injected into another partial by calling it within the context of a data object.
A simple example of that would be having a list of links that I could reference inside content throughout the site. The reason behind this, is the need for consistency. If for example, if I have a link within text on a page that I reference a 15 times throughout an entire website, but then realize I need to add a trade mark or modify the text, I want to update it once, not 15 times.
This is an example of what I want to do. Define global data inside a json file:
links.json
{
"apple": {
"linktext": "apple",
"target": "_blank",
"href": "http://www.apple.com"
},
"blog-article-foo-bar": {
"linktext": "foo bar",
"href": "http://www.foobar.com"
},
"dell": {
"linktext": "dell",
"target": "_parent",
"href": "http://www.dell.com"
}
}
Generate a partial from that content using a simple or complex template:
links.hbs
<a href="{{href}}" {{#if target}}target="{{target}}"{{/target}}>{{linktext}}</a>
And be able to embed that partial into another one by referencing it some how. This didn't work, but I've been reading about custom helpers, but can't figure out how I would intercept the partial and bind it into the other partial.
text.json
{
"text": "If you need a computer, go to {{> link link.apple}}."
}
text.hbs
<p>
{{text}}
</p>
compiled.html
<p>
If you need a computer, go to apple.
</p>
If you have suggestions or examples that might help me understand how to achieve this, I'd really appreciate the support. Thanks in advance.
There is some information about Handlebars helpers in their docs but not that much.
Since you're trying to use handlebars syntax in the value of a property on the context (e.g. text), handlebars won't render the value since it's already rendering the template. You can create your own helper that can render the value like this:
Handlebars.registerHelper('render', function(template, options) {
// first compile the template
const fn = Handlebars.compile(template);
// render the compiled template passing the current context (this) to
// ensure the same context is use
const str = fn(this);
// SafeString is used to allow HTML to be returned without escaping it
return new Handlebars.SafeString(str);
});
Then you would use the helper in your templates like this:
{{render text}}
Thanks for the example #doowb, your code did work but not for what I was trying to do. I really wanted something more complicated but I simplified my question not knowing it would be an issue. The code you provided worked (I think after a slight tweak) for a simple render of a template, but my templates use helpers such as #each and #if which caused the issue. Where the helpers were in my template, I ended up getting async placeholders. For example: <a $ASYNC$1$3...> I later learned this has to do with how partials are rendered. Understanding that lead me to subexpressions and the below solution.
Keeping my example above with some modifications, this is how I was able to merge partials.
First, I simplified the placeholder in text.json to basically a unique ID, instead of trying to render the partial there.
On the hbs template that I'm rendering to, such as a page or whatever, I included the insert helper with 3 arguments. The first two are subexpressions, each return a flattened partials as strings. The key here is that subexpressions process and return a result before finishing the current process with the helper. So two flattened templates are then sent to the helper along with the placeholder to search for.
The helper uses the third argument in a regex pattern. It searches the second argument (flattened parent template) for this pattern. When found, it replaces each instance of the pattern with the first argument (yes its a global fine replace).
So, the flattened child string gets inserted into parent each time placeholder is found.
First argument
(partial "link" link.apple)
Returns
'apple'
Second argument
(partial "text" text.text-example)
Returns
'<p class="text font--variant">If you need a computer, go to {{linkToApple}}.</p>'
Third argument
'linkToApple'
text.json
{
"text-example": {
"elm": "quote",
"classes": [
"text",
"font--variant"
],
"text": "If you need a computer, go to {{linkToApple}}."
}
}
text.hbs
<{{elm}} class="{{#eachIndex classes}}{{#isnt index 0}} {{/isnt}}{{item}}{{/eachIndex}}">{{text}}</{{elm}}>
compile.hbs
{{insert (partial "link" link.apple) (partial "text" text) 'linkToApple' }}
compile.html
<p class="text font--variant">If you need a computer, go to apple.</p>
gulpfile.js
app.helper('insert', function(child, parent, name) {
const merged = parent.replace(new RegExp('\{\{(?:\\s+)?(' + name + ')(?:\\s+)?\}\}', 'g'), child);
const html = new handlebars.SafeString(merged);
return html;
});
Hope this helps someone else. I know this can use improvements, I'll try to update it when I get back to cleaning up my gulp file.
I can't believe why I can't find anything to this topic ...
I got a form with let's say lastname (input), firstname (input), description (textarea as I want provide several lines). Let's start with the creation of a new object:
Okay, you type something in like
lastname: fox
firstname: peter
description:
what can I say ..
well I'm THE guy
bye
This arrives at my Java Spring MVC Backend Controller as what can I say ..\nwell I'm THE guy\n\nbye which is fine as I can determine where line breaks are.
So, now I want to edit this object. Thus I want to read the stored data and put it in the form. On Serverside I now edited the description text so that I replaced the \n with <br> so that I have HTML breaks.
Now I use angular-sanitize (ngSanitize dependency) and use the directive ng-bind-html="my.nice.description"
If I use this on a DIV, everything works fine, HTML gets rendered and I get my breaks. So this works perfectly:
<span ng-bind-html="my.nice.description"></span>
or one of the following:
<div ng-bind-html="my.nice.description"></div>
<p ng-bind-html="my.nice.description"></p>
BUT as I want to (re)fill my form so the user can edit his previous input, I still use a textarea. Like this:
<textarea ng-bind-html="my.nice.description"></textarea>
And this does NOT work in any way. Which means that I get 's in my text, unrendered.
Though this seems like a ridicilous normal task. It's a form with a simple multiline box, so I want to write my several lines and I want to read them and I want to edit them.
As I am rather a backend guy and not very familiar with HTML and AngularJS I hope that I'm just using the wrong html element or something like this ... Maybe someone can help me out? It's frustrating :(
Thanks in advance and I guess and hope this is not a real hard task :x
store 'br' in your model, so you can use ng-bind-html. add a directive to your textarea which makes the conversion between your $viewVale ('\n') and your model.
.directive('lbBr', function () {
return {
restrict: 'A',
require: '?ngModel',
link: function (scope, element, attrs, ngModel) {
if (!ngModel) {
return;
}
ngModel.$parsers.unshift(function(value) {
return value.replace(new RegExp('\n', 'g'), '<br />');
});
ngModel.$formatters.unshift(function(value) {
if (value) {
return value.replace(new RegExp('<br />', 'g'), '\n');
}
return undefined;
});
}
};
});
<textarea> elements cannot contain other elements (in your case, <br>'s). They are standalone. You'll have to convert the variable-returned-from-server-containing-<br>'s back to \n's, and vice versa back and forth. You can use an angular directive that handles that for you.