Creating an Infobox for Mobile View Using Angular in Susper

In Susper, the Information and Analytics boxes disappeared for widths smaller than 1100px, since they were too big to fit in the existing page layout.
In Laptop view:

In Mobile view:

Hence we decided to design a new Info-cum-Analytics box for mobile devices, where the Analytics are displayed only if the ‘Show Analytics’ button is clicked and they are hidden on clicking the ‘Hide Analytics’ button.

The following is the html code for the Infobox:

<div class=“combo-box”>
<appinfobox></app-infobox>
<button class=“btn” id=“toggle-button” (click)=“BoxToggle()” type=“button” datatoggle=“collapse” datatarget=“#statbox” ariaexpanded=“false” ariacontrols=“collapseExample”>
{{boxMessage}} Analytics
</button>
<appstatsbox class=“collapse” id=“statbox”></app-statsbox>
</div>

We can make the following observations:

  • The combo box has both the Info and the Stats box, in addition to a button, which toggles the display status of the Analytics box.
  • To display the appropriate message on the button, we have a special function called BoxToggle() which sets the value of boxMessage()
  • The data-toggle attribute of the button has been set to collapse and the data-target is statbox
  • The statsbox has the class collapse, so that it collapses on clicking on the Toggle button.

The typescript code is as follows:

BoxToggle() {
if (this.boxMessage === ‘Show’) {
this.boxMessage = ‘Hide’;
} else {
this.boxMessage = ‘Show’;
}
}

This code thus effectively toggles between the messages Show and Hide, if the button is clicked when the message says Show, it changes to Hide and vice-versa

The CSS code:

@media screen and (min-width:768px) {
div.combo-box {
display: none;
}
}

The css code ensures that this combo-box is displayed only for widths less than 768px (only mobile and tablet screens).

To view the entire code you can check results.component.html and results.component.css in the Susper repository.

References

  1. W3 Schools for Collapsible buttons and their implementation: https://www.w3schools.com/bootstrap/bootstrap_collapse.asp
  2. Official Bootstrap documentation for collapsible buttons: https://v4-alpha.getbootstrap.com/components/collapse/
Continue Reading Creating an Infobox for Mobile View Using Angular in Susper

Writing Browser Specific CSS for Susper in Angular

In Susper, we were facing a unique problem for Information box and Analytics box alignment.
At a width of around 1290 px, the boxes fit perfectly in Firefox as shown:

However, they were slipping to the next line in Google Chrome browsers for the same dimension(1290 px)

The solution to this issue was to write browser-specific CSS.
The two most commonly used browser specific tags are

  1. @-moz-document url-prefix() { }: This tag is used to target the Mozilla Firefox browser in particular. Anything written within the curly braces will not apply to any other browser.
  2. @media screen and (-webkit-min-device-pixel-ratio:0) { }: This tag is used to target all browsers that support webkit such as Chrome, Safari etc.

For our problem, we need to use @media screen and (-webkit-min-device-pixel-ratio:0) { }
This was how the code was written for both the components (Information box and Analytics box). Please refer to infobox.component.css and statsbox.component.css for the entire code.

@media screen and (-webkit-min-device-pixel-ratio:0) {
@media screen and (max-width: 1300px) {
.card {
width: 366px;
}
}
}
@media screen and (max-width: 1280px) {
.card {
width: 366px;
}

As a result of this snippet of code, we see the following effects:

  • In Chrome, the boxes change to a smaller width at 1300px itself, thus preventing it from slipping to the next line
  • In Firefox, the boxes change to a smaller width only at 1280px, and not at 1300px, thus achieving the exact design we envisioned.

This is how the display finally looks in Chrome:

References:

  1. Stack overflow on specific CSS tags for Chrome: https://stackoverflow.com/questions/9328832/how-to-apply-specific-css-rules-to-chrome-only
  2. Stack overflow on specific CSS tags for Firefox: https://stackoverflow.com/questions/952861/targeting-only-firefox-with-css
Continue Reading Writing Browser Specific CSS for Susper in Angular