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I am using react-day-picker library to for date rage picker react-day-picker library url but I want to show this calendar on my button click event. How to achive this.
how about setting a flag before rendering the component by using the state?
ex.
a button click can call renderCalendar method
renderCalendar(){
this.setState({showCalendar:true})
}
and instead of doing :
<DayPicker numberOfMonths={2} />
wrap it inside a conditional statement
{ this.state.showCalendar ?
//show the calendar
<DayPicker numberOfMonths={2} /> :
//Do not show the calendar
null
}
Related
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I'm learning React and as part of that I have tried some code for making a notebook kind of app where I get to add notes and then they are displayed dynamically
When I'm trying to add a note, the new react component(note) is getting displayed but immediately getting disappeared. As if the entire browser is refreshed. Attaching my code. This is my first time asking the question so not even sure how of it was understandable.
https://codesandbox.io/s/keeper-part-3-starting-forked-0mf1cs
For most of the modern browsers the default type of button tag is submit (https://stackoverflow.com/a/31644856/7399478). So, the form is submitted when you click the button and the page is refreshed after submit.
You need to change add type="button" to your button tag in your CreateArea.jsx component in order to prevent submitting the form like:
<button
type="button"
onClick={() => {
props.onAdd(note);
}}
>
Add
</button>
You can take a look at this forked sandbox for the live working example.
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I have a Microsoft SQL Server database with customers data:
Name,
City,
Details,
Latitude
Longitude
And I have an Angular application with Google Maps API implemented.
I want to add markers directly from the database to my map. How can I do that?
First of all you need an web API to return list or array of Latitudes nd Longitudes. Next step is, in angular you have to install #angular/google-maps
npm i #angular/google-maps
After that, you can write the code below in ts file after get data from API:
apiResult.forEach(item => {
this.markers.push(new google.maps.Marker({
position: {
lat: item.Latitude,
lng: item.Longitude
},
draggable: false,
label: item.Name
}));
});
Finally, you should add the code below in HTML.
<google-map [zoom]="markerZoom" height="400px" width="100%" [center]="markerCenter">
<map-marker #markerElem="mapMarker" *ngFor="let marker of markers" [label]="marker.label"
[position]="marker.position" [options]="marker">
</map-marker>
<map-info-window *ngFor="let marker of markers" [position]="marker.position">Hello Google Maps
</map-info-window>
</google-map>
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Is there any reason that this attribute tag a[h2]{color:orange;} wont work in css? I Cant seem to get the attribute tag to work for any elements.
a[h2] {
color:orange;
}
Means that all <a> tags that have an attribute called h2 will be coloured orange; i.e. <a h2="whatever">hello, world!</a>.
This is probably not what you want, both because this would be invalid HTML (h2 is not an attribute of <a>, and custom attributes are only allowed if they start with data-), but also because I am assuming that you want to target <h2> tags that are inside of your <a> tags.
To that, use the following code:
a h2 {
color:orange;
}
That will colour all <h2> tags inside of <a> tags orange.
Read more about CSS Selectors here.
Did you make a reference in the html page to your stylesheet?
<link rel="stylesheet" type="text/css" href="theme.css">
If this is done, check whether the element has an h2 attribute. Something like <a h2="value">
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I have an array of string into html page with math operation like ["2","*","3","-","1"], in html body i have used:
<p>{{$eval(expression)}}</p>
in js
$scope.math = [];
$scope.expression = $scope.math.join('');
I need to take this value and modify into js, as example
expression + 1 then show 6. i need to take the result 5 and sum to 1
Thanks for answer.
You can use eval in controller as well. For example:
Controller:
$scope.math = ["2","*","3","-","1"];
$scope.expression = $scope.math.join('');
$scope.modifiedExpression = eval($scope.expression) + 1;
HTML:
<p>{{$eval(expression)}}</p>
<p>{{modifiedExpression}}</p>
Result:
5
6
See http://jsfiddle.net/xfrjdtrb/
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I have the following click handler:
<Select
name="batchCompChooser"
value={this.state.batchCompId}
options={batchCompItems}
clearable={false}
onChange={this.handleBatchCompChange()}
/>
However, I get the following error from the onChange line:
BatchComponentChooser.js?0aaf:54 Uncaught TypeError: Cannot read property 'value' of undefined
How do I fix this?
If you have an event handlers, such as onClick, it is easy to accidentally do this:
onClick={this.someFunc()}
REMOVE THE parens ()
That will actually invoke the function immediately on render.
Instead you want to pass a reference to a function like this:
onClick={this.someFunc}
So in my case it should look like this:
<a onClick={this.doSomething}>Do something link</a>
If you need to pass parameters, you can do it like this with the arrow function:
<a onClick={() =>this.doSomething(true)}>Do something link</a>
Specifically in the example above the onChange should have the trailing parens removed, it should be changed to:
<Select
name="batchCompChooser"
value={this.state.batchCompId}
options={batchCompItems}
clearable={false}
onChange={this.handleBatchCompChange}
/>
Hope that helps someone out there...