AngularJS ng-switch without extra DOM - javascript

I have a custom directive and an object myObj on the current $scope (inside an ng-repeat).
If the object has a type of html, I want to use one template:
<span ng-bind-html="myObj.html"></span>`
Otherwise I want to use a different template:
<span>{{myObj.value}}</span>`
My problem
This is invalid because a custom directive template must contain exactly one root node:
<span ng-if="myObj.type==='html'" ng-bind-html="myObj.html"></span>
<span ng-if="myObj.type!=='html'">{{myObj.value}}</span>
This is invalid because it destroys my page with extra DOM: (wrapping all my spans (there could be thousands) in unnecessary ng-switch nodes...)
<ng-switch on="myObj.type">
<span ng-switch-when="html" ng-bind-html="myObj.html"></span>
<span ng-switch-default>{{myObj.value}}</span>
</ng-switch>
My Question
Is it possible to have a directive pick it's template based on the result of a switch, without creating extra unnecessary DOM? For example, you can specify replace: true when creating a directive - is it possible to similarly have an ng-switch where the result replaces the switch tag itself?
Edit
My Directive:
return {
replace: true,
controller: 'ChunkController',
scope: {
chunk: '=deChunk'
},
templateUrl: de.partial.chunk,
link: function (scope, el, attr, ctrl) {
el.on('keydown', handleKeypress.bind(ctrl));
el.on('click', ctrl.showValue);
}
};
And its usage:
<div class="content" contenteditable="{{node.type!=='static'}}">
<div data-ng-repeat="chunk in node.chunks" data-de-chunk="chunk"></div>
</div>
With the intent that the child <div> will be replaced with the sequence of <span>s from above.

I wouldn't even bother if you are storing the html in a service just check to see if a value for myObj.html exists in the object and if it does compile and bind the html in the linker function instead of using ng-bind-html
something like this maybe:
myapp.directive('something',function($compile){
return {
link: function(scope,elem,attrs) {
var obj = scope.$eval(attrs.something);
if(obj.html) {
var html = angular.element($compile(obj.html)(scope));
elem.append(html);
} else {
//go get the data and set obj.html
}
}
}
});

Related

AngularJs Directive update

I want to update my directive content only at some desired places, but not at others. I have simulated my problem here:
http://jsfiddle.net/Lvc0u55v/2945/
The problem is, I have an 'editor' directive which is applied in two places:
<span class="editor1" editor ></span>
<span class="editor2" editor ></span>
I want to update the content of span class="editor1" on button click.
How do I do it?
Why not go with a relatively Angularesque approach by isolating the scope of the directive and to a maximum extent, avoid jQuery in your logic.
So you could have your directive defined as such:
.directive('editor', function() {
return {
scope: {
upd : '=',
editordata : '=data'
},
template: '<div>{{editordata}}</div>',
controller: function($scope, $rootScope, $element) {
$rootScope.$on('update', function(evt, data) {
if(data.upd === $scope.upd){
$scope.editordata = data.txt;
}
})
},
link: function(scope, el, attr) {}
}
})
Here, you are passing the required information which the editor directive depends upon through its scope, namely upd (which I suppose is how you want to uniquely identify the items by) and the text data.
Meanwhile, you can define a list of the editor items in the common parent controller MyCtrl and iterate over them in the DOM with ng-repeat.
// MyCtrl controller
$scope.list = [
{upd: 'editor1', data: 'original data for editor1'},
{upd: 'editor1', data: 'original data for editor2'}
]
<!-- HTML -->
<div ng-repeat="item in list" upd="item.upd" data="item.data"></div>
Demo
You can check if the current directory has the "editor1" class and if so complete your logic.
You can look at this example :
element[0].querySelector('.editor1') !== undefined'

angular directive: switch between two templates dynamically

I am trying to create a directive named availableTo that can switch between two different templates depending on some message. For example, if the field is an input with the ng-model directive, I would first need to change it to read-only using the <span> tag. So far, my code can switch the view to read-only, but I cannot seem to switch it back to input:
var directive = {
restrict: 'A',
require: '?ngModel',
link: linkerFn,
replace: true
};
function linkerFn(scope, element, attrs, ngModelCtrl) {
var clonedElement = angular.copy(element);
var preOuterHTML = clonedElement[0].outerHTML; //this can save the <input> field html code
scope.$on('mode_changed', function() {
var curUserRole = userservices.getUserRole();
if (attrs.availableTo == curUserRole) {
var e = $compile(preOuterHTML)(scope);
element.replaceWith(e);
} else {
var template = '<span>' + ngModelCtrl.$viewValue + '</span>';
var e = $compile(template)(scope);
element.replaceWith(e);
}
}); //scope.$on
} //linkerFn
For an input field:
<input name="test1" class="form-control" ng-model="name" placeholder="Name 1" available-to="ADMIN"/>
I also noticed that once I change the template in the else block above, the element re-renders, and the preOuterHTML does not contain the original element html any more. This seems to be mission impossible to me, but I would like to hear some expert opinions. Thanks
element.replaceWith(e); Don't do that. In Angular, if you find yourself attempting to modify the DOM directly, you are by definition doing it wrong. You gotta sit back and let Angular do the work.
If you need to replace a directive's entire template, a fairly straightforward approach is to use ng-include with a scope variable containing the desired conditional templateUrl, e.g.
var directive = {
// ...
template: '<div ng-include="myTemplateUrl"></div>',
link: function(scope, el) {
if (/* whatever */) {
scope.myTemplateUrl="templates/foo.html";
} else {
//...etc
}
},
};
(This does add an extra DOM node to the tree, but that's generally harmless.)
It sounds like in your case you may not need to go that far, though; a simple ng-if inside your template is probably enough to swap between your read-only <span> and <input>.

angularJS how to change attrs in directive's link

I set a progress in my app
I want to controll The progress in angular's directive
but how can I change data-value and data-total in directive's link func?
app.html
<div class="ui indicating small progress" data-value="39" data-total="50" plan-progress>
<div class="bar">
<div class="progress"></div>
</div>
</div>
In this html, I want change data-value and data-total
I try this:
app.js
todoApp.directive('planProgress', function() {
return {
link: function(scope, elem, attrs) {
attrs.value = 10
attrs.total = 20
elem.progress();
}
};
});
But it doesn't work
so I want to know how to change it in my directive?
Use attrs.$set() in your link function and recompile the element. Also, don't forget to inject the $compile service to your directive.
In your html you've added the directive as an attribute but didn't mention it in the restrict value in your directive definition. You need to mention it in directive definition.
See the code bellow:
todoApp.directive('planProgress', function($compile) {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
attrs.$set('value', 10);
attrs.$set('total', 20);
$compile(elem)(scope);
}
};
});
Simply use :
attrs["data-value"] = 10;
attrs["data-total"] = 20;
You don't want to use attrs.data-total = 20 because the - will force a subtraction.
It's always legal in javascript to use x[keyName] instead of x.keyName, and you must use this second notation when keyName is a strange key such as **$^ùjsls* or data-value. A more useful case is when the key is a variable.
On last thing : as you do, you will always rewrite the coder's inputs. It may have sense, but it's not very elegant.

AngularJS - inject string from model to HTML's tag name

is it possible to inject string into html's tag name with angular?
Something like this:
<div ng-repeat="type in types">
<bettype-{{type.id}}></bettype-{{type.id}}>
</div>
The output I need is:
<bettype-1></bettype-1>
<bettype-2></bettype-2>
I am also using polymer (this way I am creating the custom html tags).
I think the best solution would be to create a directive which creates custom elements, something like:
.directive('bettype', function($compile) {
return {
restrict: 'E',
compile: function($element, $attr) {
return function($scope, $element, $attr) {
// Create new element here with $attr.number
var number = $attr.number,
element = angular.element('<bettype-'+number+'></bettype-'+number+'>');
// Replace newly created element
$element.replaceWith(element);
$compile($element)($scope);
}
}
}
});
Not sure if that will work, but probably that's the way to go...
Note: I don't think it\s a good idea to have dashed separated elements like bettype-1..

Getting ng-repeat to work inside of AngularJS's $interpolate service

I am using the AngularJs-UI components for Bootstrap. I would like to insert a filled out template into one of the data elements for the popover feature. This works find for all elements not inside of a ng-repeat. How do I get the ng-repeat elements to work inside of a interpolated template?
I have a plunker at http://plnkr.co/edit/Cuku7qaUTL1lxRkafKzv Its not working because I don't know how to get Angular-UI-bootstrap to in plunker.
<div data-popover="{{createHTML()}}">some content</div>
My local scope has the function createHTML() that looks something like this.
angular.module('myApp', ['ngSanitize'])
.controller("myController", function(myService){
$scope.createHTML = function() {
var thingy = { blah: "foobar", collection: [ "1", "2", "3" ] };
return myService.html_for(thingy);
}
});
And the service is
angular.module('myApp')
.service('myService', function($templateCache, $interpolate, $sanitize, $log) {
"use strict";
function html_for(thingy) {
var template = $templateCache.get('thingyTemplate.html'),
link = $interpolate(template),
html = link(thingy),
unsafe = $sanitize(html);
return unsafe;
}
return {
html_for: html_for
}
});
Templates:
<script type="text/ng-template" id="thingyTemplate.html">
<div>
<div><strong>Blah:</strong> {{blah}}</div>
<div data-ng-repeat="foo in collection"><strong>Collection:</strong> {{foo}}</div>
<div><strong>Collection[0]:</strong> {{collection[0]}}</div>
<div><strong>Collection[1]:</strong> {{collection[1]}}</div>
<div><strong>Collection[2]:</strong> {{collection[2]}}</div>
</div>
</script>
<script type="text/ng-template" id="template/popover/popover.html">
<div class="popover {{placement}}" data-ng-class="{ in: isOpen(), fade: animation() }">
<div class="arrow"></div>
<div class="popover-inner">
<h3 class="popover-title" data-ng-bind="title" data-ng-show="title"></h3>
<div class="popover-content" data-ng-bind-html="content"></div>
</div>
</div>
</script>
$interpolate doesn't handle directives like ngRepeat (
Difference between parse, interpolate and compile ). $interpolate:
Compiles a string with markup into an interpolation function. This
service is used by the HTML $compile service for data binding.
To handle ngRepeat and other directives you want $compile. But for your use case $compile is going to result, unfortunately, in a number of changes because:
It needs a scope to compile against rather than just a context like $interpolate. Moreover it needs the scope thingy is on.
This means we'll need to reference your properties like so {{thingy.blah}} instead of {{blah}} inside your template.
The compile needs to happen when the popup is on the dom.
The popup is only on the dom when it's open.
So we can't just replace $interpolate with $compile inside your service.
One approach is to replace data-ng-bind-html with the following directive that acts like an ng-bind-html that has a built in $compile (clearly you should only use this with html that you know is safe).
.directive('compile', function($compile) {
return function(scope, element, attrs) {
scope.$watch(
function(scope) {
return scope.$eval(attrs.compile);
},
function(value) {
var result = element.html(value);
$compile(element.contents())(scope.$parent.$parent);
}
);
};
});
Used like so (with compile replacing ng-bind-html:
<div class="popover-content" compile="content"></div>
One issue is that we need thingy to be in scope. There's a few of ways of handling that- but for demonstration purposes I've manually gone back up to the scope the popover is called from - which is 2 scopes up thus the scope.$parent.$parent.
Using this compile directive you no longer $interpolate or $sanitizeso the function in your service can shrink down to just returning the appropriate template:
function html_for() {
var template = $templateCache.get('thingyTemplate.html');
return template;
}
demo fiddle

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