AngularJS - Show DOM elements depending on the value of variable - javascript

I've got the following AngularJS structure
<li ng-repeat="content in contents">
<img src="{{content.image_url}}" />
<div class="title">{{content_title}}</div>
</li>
But if "content.image_url" is NULL or it doesn't exist, I don't want to display the IMG tag. So something like
{{#if content.image_url}}
<img.....
{{/if}}
Which is the handlebarjs way of doing a conditional check. How could I achieve this in AngularJS? Do I need a directive to do this?

Use ng-show:
<li ng-repeat="content in contents">
<img ng-show="content.image_url != ''" src="{{content.image_url}}" />
<div class="title">{{content_title}}</div>
</li>
Also, I would use ng-src instead of src to avoid errors in the console while the image is loading:
<li ng-repeat="content in contents">
<img ng-show="content.image_url != ''" ng-src="{{content.image_url}}" />
<div class="title">{{content_title}}</div>
</li>

Related

How to bind the li element to an id inside ng-repeat to display different images for different li

This is my html code
<ul class="steps-indicator">
<li ng-repeat="step in steps">
<a ng-click="goTo(step)">{{step.title || step.wzTitle}}</a>
</li>
</ul>
And this is my css :
.steps-indicator li a:before{
content:url('/img/wizard-arrow.png') no-repeat;
}
The thing i am trying to achieve here is to show different images in front of different anchor elements.
I am using the angular-wizard in ionic for mobile, and customizing the look and feel of the progress bar element. Here is the link http://mgonto.github.io/angular-wizard/
Any help would be appreciated!!
UPDATE:
I think i missread your question. Is that what you need?
Put all the images inside the "step.images" and display this all doing an ng-repeat again.
<ul class="steps-indicator">
<li ng-repeat="step in steps">
<img ng-src="{{img}}" ng-repeat="img in step.images" />
<a ng-click="goTo(step)">{{step.title || step.wzTitle}}</a>
</li>
</ul>
If you only have 1 image per "step" you don't need to use ng-repeat anymore for the image.
<ul class="steps-indicator">
<li ng-repeat="step in steps">
<img ng-src="{{step.image}}" />
<a ng-click="goTo(step)">{{step.title || step.wzTitle}}</a>
</li>
</ul>
Then just modify your css to show it as you like.
Is that what you need?

Pass content as object in angular-strap popover

I am trying to do the following:
I have a json array of questions which I pass like this:
<a href=""
...
title="Questions"
data-content="{{item.questions}}"
data-template="popover.question.tpl.html"
...
bs-popover>
{{item.questions.length}}
</a>
and a template 'popover.question.tpl.html' that contains the following code:
<div class="popover">
<div class="arrow"></div>
<h3 class="popover-title" ng-bind="title" ng-show="title"></h3>
<div class="popover-content" ng-model="content">
<ul>
<li class="animate-repeat" ng-repeat="question in content">
{{question.text}}
</li>
</ul>
</div>
</div>
The problem is probably that the content is passed as a string by the directive, leading in the ng-repeat not working. If I just evaluate "{{content}}" I get the actual json data in my div but obviously I can't work with that. Any ideas on how to do that? Do I have to create a separate controller for that (which I would like to avoid)?
data-content will accept only string. So object cannot be passed through that.
Angular-strap popover will inherit the scope from where it is getting opened.
So, in your popover.question.tpl.html you can directly access item.questions.
<div class="popover">
<div class="arrow"></div>
<h3 class="popover-title" ng-bind="title" ng-show="title"></h3>
<div class="popover-content" ng-model="content">
<ul>
<li class="animate-repeat" ng-repeat="question in item.questions">
{{question.text}}
</li>
</ul>
</div>
</div>
Check this plunker for working example.

Expression evaluation in angular.js

I have the following code:
<li ng-repeat="item in somearray">
<img src="{{ item.url }}" />
</li>
For every item the browser makes a GET request that is an encoded expression, for example:
"http://someurl.com/somepath/blalba/1/%7B%7Bitem.url%7D%7D". Although it does load these images properly, it makes unnecessary requests. Is there any way to avoid this?
Use:
<li ng-repeat="item in somearray">
<img ng-src="{{item.url}}" />
</li>

AngularJS : Appending the same structure on the click of each item

My index.html page is like following:
<div id="sidepanel" ng-controller="myCtrl">
<ul class="drop-down">
<li ng-repeat="item in items">
{{item.name}}
</li>
</ul>
</div>
<div id="mainpanel" ng-controller="listCtrl">
<div ng-view></div>
</div>
For this ng-view I have record-list.html to show all the records which is like following:
<div class="container">
<ul class="design">
<li id="{{record.name}}" ng-repeat="record in records">
<div>......</div>
</li>
</ul>
</div>
Now i want to add the same structure (as like each record) append on the click of each item of the side panel.
what is the logic for that ?
My recent UI Looks like this & i want to add the same structure on each click which should be append the existing structure.
Please Help.Thanks.
It sounds like perhaps each "record" has a set of children "records." If this is the case, I would recommend using angular's ng-switch directive to conditionally display the correct (or no) set of sub-records on the side.

Access index of the parent ng-repeat from child ng-repeat

I want to use the index of the parent list (foos) as an argument to a function call in the child list (foos.bars).
I found a post where someone recommends using $parent.$index, but $index is not a property of $parent.
How can I access the index of the parent ng-repeat?
<div ng-repeat="f in foos">
<div>
<div ng-repeat="b in foos.bars">
<a ng-click="addSomething($parent.$index)">Add Something</a>
</div>
</div>
</div>
My example code was correct and the issue was something else in my actual code. Still, I know it was difficult to find examples of this so I'm answering it in case someone else is looking.
<div ng-repeat="f in foos">
<div>
<div ng-repeat="b in foos.bars">
<a ng-click="addSomething($parent.$index)">Add Something</a>
</div>
</div>
</div>
According to ng-repeat docs http://docs.angularjs.org/api/ng.directive:ngRepeat, you can store the key or array index in the variable of your choice. (indexVar, valueVar) in values
so you can write
<div ng-repeat="(fIndex, f) in foos">
<div>
<div ng-repeat="b in foos.bars">
<a ng-click="addSomething(fIndex)">Add Something</a>
</div>
</div>
</div>
One level up is still quite clean with $parent.$index but several parents up, things can get messy.
Note: $index will continue to be defined at each scope, it is not replaced by fIndex.
Take a look at my answer to a similar question.
By aliasing $index we do not have to write crazy stuff like $parent.$parent.$index.
Way more elegant solution whan $parent.$index is using ng-init:
<ul ng-repeat="section in sections" ng-init="sectionIndex = $index">
<li class="section_title {{section.active}}" >
{{section.name}}
</li>
<ul>
<li class="tutorial_title {{tutorial.active}}" ng-click="loadFromMenu(sectionIndex)" ng-repeat="tutorial in section.tutorials">
{{tutorial.name}}
</li>
</ul>
</ul>
Plunker: http://plnkr.co/edit/knwGEnOsAWLhLieKVItS?p=info
You can also get control of grand parent index by the following code
$parent.$parent.$index
You can simply use use $parent.$index .where parent will represent object of parent repeating object .
$parent doesn't work if there are multiple parents. instead of that we can define a parent index variable in init and use it
<div data-ng-init="parentIndex = $index" ng-repeat="f in foos">
<div>
<div data-ng-init="childIndex = $index" ng-repeat="b in foos.bars">
<a ng-click="addSomething(parentIndex)">Add Something</a>
</div>
</div>
</div>

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