I have the following variable that work very well on the code bellow, but I would like to add an if/else statement and I'm having some issue with the formatting. Any feedback would be greatly appreciated.
Before:
var originalSales = {
"RenewalDate": validateDefaultDateValue('#(Model.Program.RenewalDate.HasValue ?
Model.Program.RenewalDate.Value.AddYears(1).ToString("g") : "" )'),}
What I'm trying to Accomplish:
var originalSales = {
"RenewalDate": validateDefaultDateValue(#if((Model.Program.IsNonServiceYear) &&
(Model.ProgramCode.HasAutoRenewDate == true))
{('#(Model.Program.RenewalDate.HasValue ? Model.Program.RenewalDate.Value.AddYears(1).ToString("g") : "" )'),}
else
{('#(Model.Program.RenewalDate.HasValue ? Model.Program.RenewalDate.Value.ToString("g") : "" )'),}),
You can use this pattern:
#{
if ( Model.Program.IsNonServiceYear && Model.ProgramCode.HasAutoRenewDate )
{
originalSales =x;
}
else
{
originalSales =y;
}
}
<div ng-repeat="widget in widgets"
ng-class="">
<div>{{widget.row}}</div>
</div>
I'm trying to apply a class inside the repeat based on a particular value in the repeat, for example if widget.row = 0 and it is the first widget with that value displayed then give it a class and all the other widgets that have row as 0 do not get the class. This will need to be the case if it equals 1 or 2 and so on so I can't just use $first as there will be multiple row values and multiple widgets for example it may output something like:
0 0 0 0 1 1 2 2 2 2
So the easiest way for me to achieve this was using the Adjacent sibling selector rather than do it with angular as each item is not really aware of the others:
<div ng-repeat="widget in widgets"
class="widget-row-{{widget.row}}">
<div>{{widget}}</div>
</div>
and then use CSS for:
.widget-row-0:first-child {}
.widget-row-0 + .widget-row-1 {}
.widget-row-1 + .widget-row-2 {}
.widget-row-2 + .widget-row-3 {}
Best practise is to prepare your data in a init function in your controller. It's nice and KISS! It's the best way to prepare your data in control function instead of misapply the E2E binding of AngularJS. It solve your problem so no class is written when there is no need for (as you asked for). Its proceeded once instead of calling a function again, again and again by E2E binding like ng-class="shouldIAddAClass()".
View
<div ng-repeat="widget in widgets"
ng-class="{ 'first' : widget.first }">
<div>{{widget.row}}</div>
</div>
Controller
$scope.widgets = [{
row: 0
}, {
row: 2
},{
row: 0
},{
row: 1
},{
row: 1
},{
row: 2
},{
row: 0
}];
//self calling init function
(function init () {
var widgetRowFound = {};
angular.forEach($scope.widgets, function (widget, key) {
if (angular.isDefined(widgetRowFound[widget.row])) {
$scope.widgets[key].first = false;
} else {
$scope.widgets[key].first = true;
widgetRowFound[widget.row] = true;
}
});
})();
Not the cleanest one but will work
<div ng-repeat="widget in widgets">
<div ng-class="{'myClass': applyClass(0, widget.row)}"></div>
</div>
----------
$scope.widgetsRows = {};
function applyClass(number, row){
if(!$scope.widgetsRows[row]){
$scope.widgetsRows[row] = true
}
return row == number && $scope.widgetsRows[row];
}
You can add the class you want to use to the widget objects in the controller first:
var tempRow = "";
for(var i = 0;i < $scope.widgets.length;i++) {
if($scope.widgets[i].row != tempRow) {
$scope.widgets[i].class = "myClass";
tempRow = $scope.widgets[i].row;
}
}
Then you can use that class:
<div id="widgets" ng-repeat="widget in widgets"
class="{{widget.class}}">
<div>{{widget.row}}</div>
</div>
Hope this helps
You can create a method that will be called from ng-class to achieve your goal. The method should return the class to be used.
$scope.firstHitFound = false;
$scope.isFirstZeroValue = function(value){
if($scope.firstHitFound == false && value == 0){
$scope.firstHitFound = true;
return class1;
}else{
return class2;
}
}
The HTML / Angular shoudl look as:
<div ng-class="isFirstZeroValue(widget.row)">
If you want to style it, add the class to all the widget that match your criteria, and use css to perform it only on the first of them.
Html:
<div id="widgets" ng-repeat="widget in widgets"
ng-class="{'widget-first': widget.row == 0}">
<div>{{widget.row}}</div>
</div>
Css:
#widgets.widget-first:first-of-type {
background: #ff0000;
}
You can use ng-class in addition of your ng-repeat:
Example
<div ng-repeat="widget in widgets" ng-class="{'test': widget.value === 0}">
<div>{{widget.row}}</div>
</div>
You need to call a method that will check if the row result is not same with previous value. If it not same , it will return true value and will be assigned ng-class, and if not return false. Filter this out using ng-if.
Html
<div ng-repeat="widget in widgets"
ng-class="">
<div ng-if="calculate(widget.row)">
<div ng-class="test">{{widget.row}}</div>
</div>
<div ng-if="!calculate(widget.row)">
<div>{{widget.row}}</div>
</div>
</div>
Controller
var arr = [];
$scope.calculate = function (row) {
arr.push(row);
var breakLoop = false;
angular.forEach(arr, function (oldVal, newVal) {
breakLoop = false;
if (oldVal != newVal) {
breakLoop = true;
}
)};
return breakLoop;
}
Hi I have been using this tag to change my css style, if the condition totalAsset and sortedAsset are same
<div class="table-row" ng-repeat="x in myData"
ng-model="sort(x.totalAsset)"
ng-class="{'lightblue': x.totalAsset == sortedAsset}">
totalAsset is my data in like this
$scope.myData = [
{
totalAsset: "23557"
},
{
totalAsset: "4512190",
},
{
totalAsset: "2190",
},
{
totalAsset: "1256790",
}
]
i have create a function that self sort the totalAsset
$scope.sort = function(totalAsset) {
$scope.unsortedAsset = totalAsset;
$scope.sortedAsset = $scope.unsortedAsset.split("").sort().join("");
console.log(sortedAsset);
}
in the logic only the first and last row will become blue the other two rows remain same.
But my problem here is only the last one become blue, the first one doesn't.
I am not sure about, if you need the {{ }}( they are not needed in ng2 atleast ).
<div class="table-row" ng-repeat="x in myData"
ng-model="sort(x.totalAsset)"
ng-class="x.totalAsset == sortedAsset ? 'lightblue' : ''">
Second approach is to do the if in controllers function
$scope.areValuesEqual() {
if($scope.x.totalAssets == $scope.sortedAssets) {
return 'lightblue';
}
return;
}
But this looks rather ugly, but i am just throwing this out there.
I want to conditionally show and hide this button group depending on what is passed in from the parent component which looks like this:
<TopicNav showBulkActions={this.__hasMultipleSelected} />
__hasMultipleSelected: function() {
return false; //return true or false depending on data
}
var TopicNav = React.createClass({
render: function() {
return (
<div className="row">
<div className="col-lg-6">
<div className="btn-group pull-right {this.props.showBulkActions ? 'show' : 'hidden'}">
<button type="button" className="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
Bulk Actions <span className="caret"></span>
</button>
<ul className="dropdown-menu" role="menu">
<li>Merge into New Session</li>
<li>Add to Existing Session</li>
<li className="divider"></li>
<li>Delete</li>
</ul>
</div>
</div>
</div>
);
}
});
Nothing is happening however, with the {this.props.showBulkActions ? 'show' : 'hidden'}. Am I doing anything wrong here?
The curly braces are inside the string, so it is being evaluated as string. They need to be outside, so this should work:
<div className={"btn-group pull-right " + (this.props.showBulkActions ? 'show' : 'hidden')}>
Note the space after "pull-right". You don't want to accidentally provide the class "pull-rightshow" instead of "pull-right show". Also the parentheses needs to be there.
As others have commented, classnames utility is the currently recommended approach to handle conditional CSS class names in ReactJs.
In your case, the solution will look like:
var btnGroupClasses = classNames(
'btn-group',
'pull-right',
{
'show': this.props.showBulkActions,
'hidden': !this.props.showBulkActions
}
);
...
<div className={btnGroupClasses}>...</div>
As a side note, I would suggest you to try to avoid using both show and hidden classes, so the code could be simpler. Most likely, you don't need to set a class for something to be shown by default.
2021 addendum: for performance improvement, you can look into clsx as an alternative.
If you are using a transpiler (such as Babel or Traceur) you can use the new ES6 "template strings".
Here is the answer of #spitfire109, modified accordingly:
<div className={`btn-group pull-right ${this.props.showBulkActions ? 'shown' : 'hidden'}`}>
This approach allows you to do neat things like that, rendering either s-is-shown or s-is-hidden:
<div className={`s-${this.props.showBulkActions ? 'is-shown' : 'is-hidden'}`}>
you can simply do the following for example.
let classNameDependsOnCondtion = i18n.language == 'en' ? "classname" : "";
className={`flex flex-col lg:flex-row list-none ${classNameDependsOnCondtion }`}
OR
className={`flex flex-col lg:flex-row list-none ${i18n.language == 'en' ? "classname" : ""}`}
You can use here String literals
const Angle = ({show}) => {
const angle = `fa ${show ? 'fa-angle-down' : 'fa-angle-right'}`;
return <i className={angle} />
}
In case you will need only one optional class name:
<div className={"btn-group pull-right " + (this.props.showBulkActions ? "show" : "")}>
Replace:
<div className="btn-group pull-right {this.props.showBulkActions ? 'show' : 'hidden'}">`
with:
<div className={`btn-group pull-right ${this.props.showBulkActions ? 'show' : 'hidden'}`}
Or use npm classnames. It is very easy and useful especially for constructing the list of classes
Expending on #spitfire109's fine answer, one could do something like this:
rootClassNames() {
let names = ['my-default-class'];
if (this.props.disabled) names.push('text-muted', 'other-class');
return names.join(' ');
}
and then within the render function:
<div className={this.rootClassNames()}></div>
keeps the jsx short
2019:
React is lake a lot of utilities. But you don't need any npm package for that. just create somewhere the function classnames and call it when you need it;
function classnames(obj){
return Object.entries(obj).filter( e => e[1] ).map( e=>e[0] ).join(' ');
}
or
function classnames(obj){
return Object.entries(obj).map( ([cls,enb]) => enb? cls: '' ).join(' ');
}
example
stateClass= {
foo:true,
bar:false,
pony:2
}
classnames(stateClass) // return 'foo pony'
<div className="foo bar {classnames(stateClass)}"> some content </div>
Just For Inspiration
declaring helper DOM element and using it native toggle method:
(DOMTokenList)classList.toggle(class,condition)
example:
const classes = document.createElement('span').classList;
function classstate(obj){
for( let n in obj) classes.toggle(n,obj[n]);
return classes;
}
You can use ES6 arrays instead of classnames.
The answer is based on Dr. Axel Rauschmayer article: Conditionally adding entries inside Array and object literals.
<div className={[
"classAlwaysPresent",
...Array.from(condition && ["classIfTrue"])
].join(" ")} />
More elegant solution, which is better for maintenance and readability:
const classNames = ['js-btn-connect'];
if (isSelected) { classNames.push('is-selected'); }
<Element className={classNames.join(' ')}/>
simply use this approach--
<div className={`${this.props.showActions ? 'shown' : 'hidden'}`}>
this is much more neat and clean.
<div className={['foo', condition && 'bar'].filter(Boolean).join(' ')} />
.filter(Boolean) removes "falsey" values from the array. Since class names must be strings, anything other than that would not be included in the new filtered array.
console.log( ['foo', true && 'bar'].filter(Boolean).join(' ') )
console.log( ['foo', false && 'bar'].filter(Boolean).join(' ') )
Above written as a function:
const cx = (...list) => list.filter(Boolean).join(' ')
// usage:
<div className={cx('foo', condition && 'bar')} />
var cx = (...list) => list.filter(Boolean).join(' ')
console.log( cx('foo', 1 && 'bar', 1 && 'baz') )
console.log( cx('foo', 0 && 'bar', 1 && 'baz') )
console.log( cx('foo', 0 && 'bar', 0 && 'baz') )
you can use this:
<div className={"btn-group pull-right" + (this.props.showBulkActions ? ' show' : ' hidden')}>
This is useful when you have more than one class to append. You can join all classes in array with a space.
const visibility = this.props.showBulkActions ? "show" : ""
<div className={["btn-group pull-right", visibility].join(' ')}>
This would work for you
var TopicNav = React.createClass({
render: function() {
let _myClasses = `btn-group pull-right {this.props.showBulkActions?'show':'hidden'}`;
return (
...
<div className={_myClasses}>
...
</div>
);
}
});
Reference to #split fire answer, we can update it with template literals, which is more readable,For reference Checkout javascript template literal
<div className={`btn-group pull-right ${this.props.showBulkActions ? 'show' : 'hidden'}`}>
I have tried to tailored my answer to include all the best possible solution in the post.
There are many different ways of getting this done.
1. Inline inside the class
<div className={`... ${this.props.showBulkActions ? 'show' : 'hidden'}`}>
...
</div>
2. Using the values
var btnClass = classNames(
...
{
'show': this.props.showBulkActions,
'hidden': !this.props.showBulkActions
}
);
3. Using a variable
let dependentClass = this.props.showBulkActions ? 'show' : 'hidden';
className={`... ${dependentClass }`}
4. Using clsx
<div className={clsx('...',`${this.props.showBulkActions ? 'show' : 'hidden'}`)}>
...
</div>
You can use this npm package. It handles everything and has options for static and dynamic classes based on a variable or a function.
// Support for string arguments
getClassNames('class1', 'class2');
// support for Object
getClassNames({class1: true, class2 : false});
// support for all type of data
getClassNames('class1', 'class2', null, undefined, 3, ['class3', 'class4'], {
class5 : function() { return false; },
class6 : function() { return true; }
});
<div className={getClassNames('show', {class1: true, class2 : false})} /> // "show class1"
Based on the value of this.props.showBulkActions you can switch classes dynamically as follows.
<div ...{...this.props.showBulkActions
? { className: 'btn-group pull-right show' }
: { className: 'btn-group pull-right hidden' }}>
I would like to add that you can also use a variable content as a part of the class
<img src={src} alt="Avatar" className={"img-" + messages[key].sender} />
The context is a chat between a bot and a user, and the styles change depending of the sender, this is the browser result:
<img src="http://imageurl" alt="Avatar" class="img-bot">
A function to return the correct class based on a param (if present)
getClass(param){
let podClass = 'classA'
switch(param.toLowerCase()){
case 'B':
podClass = 'classB'
break;
case 'C':
podClass = 'classC'
break;
}
return podClass
}
Now just invoke this function from the div where the corresponding class is to be applied.
<div className={anyOtherClass + this.getClass(param)}
I successfully used this logic to apply the correct color to my bootstrap table rows.
<div className={"h-3 w-3 rounded-full my-auto " + (index.endDate ==="present"? "bg-green-500":"bg-red-500")}></div>
Don't Forget to add an extra space after the static class names.
How to Write Condition on data which is fetching from Json to Angularjs?
Example : if user FIRM NAME exists Show else if user FULL NAME exists Show else Show REALNAME
I have a working Example of fetching data
at line number 25 <h3 class="moduletitle">Name : {{ module.realname }}</h3>
Please See that in PLUNKER
I hope i will get the working code update along with PLUNKER
I can suggest you have a function that returns the entity in which you want to display. Then using ng-show / ng-hide to display/hide the things you want.
Example:
function pseudoDecide(){
var displaythis = "";
if(/*boolean exp*/){ displaythis = "firm" }
else if(/*boolean exp*/) { displaythis = "full" }
else(/*boolean exp*/) { displaythis = "real" }
return displaythis;
}
Then <div ng-show="{{psedoDecide() === 'firm'}}>" etc etc, something like that.
With AngularJS 1.1.5+, you can use the ternary operator inside an expression. In your case, I believe you want something like:
<h3 class="moduletitle">Name : {{ module.firmname ? module.firmname : (module.fullname ? module.fullname : module.realname)) }}</h3>
If you don't want a nested ternary in your template, you could also go this route:
Somewhere in your controller:
$scope.pickName = function (module) {
var val;
if (module.firm_name) {
val = module.firm_name;
} else if (module.full_name) {
val = module.full_name;
} else {
val = module.realname;
}
return val;
};
And in your template:
<h3 class="moduletitle">Name : <span ng-bind="pickName(module)"></span></h3>