Set font size of Angular Material Tooltip

Question

I am very new to web development, and I cannot figure out how to solve the following issue, although it may be very easy.

I am using Angular 4 and Angular Material to implement tooltips like this:

<div mdTooltip="tooltip text" mdTooltipPosition="above">
  <span>Show tooltip</span>
</div>

I would like to make the font size of the tooltip text bigger. However, I did not manage to find how to do this in the Angular Material documentation, neither searching in the web. Does anyone have any idea on how to do this? Thanks.

Solution 1

You can fix this by adding a .mat-tooltip css declaration in you main styles file and change the font size there. You need to set !important on the font size otherwise it won't show up.

Solution 2

Per the documentation here: https://material.angular.io/components/tooltip/api

And the spec: https://github.com/angular/material2/blob/master/src/lib/tooltip/tooltip.spec.ts

You can set the property 'matTooltipClass', as follows:

<div matTooltip="tooltip text" matTooltipPosition="above" matTooltipClass="tooltip">
  <span>Show tooltip</span>
</div>

Then in your CSS (global - not for the component):

  .mat-tooltip.tooltip {
    background-color: darkblue;
    font-size: 12px;
  }

Also see their demo here: https://github.com/angular/material2/tree/master/src/demo-app/tooltip

Also keep in mind if you are using SASS, that the container for the tooltip is at the bottom and nowhere near where you are placing it in your component's HTML, so do not nest it in that component. Make sure it is standalone, otherwise it will not work. This note applies as well obviously to the comment above if you just choose to override .mat-tooltip

To see the changes, in developer tools, find the div at the bottom with the class "cdk-overlay-container". Then hover over the element. You can use your arrow keys to navigate into the element while you are hovered over to confirm whether your class is being added.

Solution 3

You can use css /deep/ selector. For example:

/deep/ .mat-tooltip {
  font-size: 14px;
}

Then you do not have to use !important

Solution 4

Add ng-deep before class name

Try this

::ng-deep .mat-tooltip {
    background: red!important;
}

Solution 5

My problem was that using a globally defined css class-name such as .customname-toolip for matTooltipClass was NOT working. My solution below, and the !important was needed; set in the global styles.css file:

.mat-tooltip {
    font-size: 16px !important;
}

View more solutions

Comments

[GLR]

Unfortunately, this only changes the font size of the text which is inside the div element ('Show tooltip'), but not the text of the tooltip.

[G.Acikgoz]

Oh sorry, I have an posted issue for you I hope that helps : github.com/angular/material2/issues/3927

[Admin]

Can you add :host to the beginning of the line? :host /deep/ .mat-tooltip {...} I think, this can help you. Good luck!

[Alic W]

@GLR - depending on Angular version you may need to use ::ng-deep .mat-tooltip { font-size: 14px; }

[Admin]

@GLR You can read this - stackoverflow.com/questions/32853924/… I hope, this help you to understand how it work.

[aruno]

If you use .mat-tooltip.largerTooltip in the css definition then you don't need to put !important. I updated the code.

[Alexei - check Codidact]

+1. Besides allowing to avoid !important, is also works if specified within the component css rather than global css.

[Idan Yadgar]

deep is deprecated

[hamid reza]

Thanks but it worked for me without setting !important.

[Nikhil Kumar vats]

@hamidreza Can you please explain why css change in component css doens't work while if we add this into global works?

[hamid reza]

@NikhilKumarvats Sorry! I can't.

[iNikhil19]

@NikhilKumarvats you might need to consider overriding it with ng-deep

[Tim Harker]

@IdanYadgar with deep being deprecated, what should you use instead?

[Gel]

hmm, in our jhispter app, in the global, I kind of used the same approach but different in css hierarchy what your doing here... I had .largerToolTip followed by .mat-tooltip and it is working well atleast today September of 2020.

[FabianTe]

This does not work as of 15.11.2020. All i did was add the tree lines T. Bulford also added :(

[Yaniv K.]

@GilEpshtain That's the only thing that worked for me out of all the solutions here