How to prevent mobile keyboard from rising footer over the text fields?

StackOverflow https://stackoverflow.com/questions/22627646

Question

I am having trouble with my footer. I want the footer to stay at the bottom of the screen, but there is a slight problem. When using mobile browser, some fields get blocked by the footer when opening the keyboard. The footer rises over the keyboard and blocks the field you are typing in. How can I keep my footer at the bottom and prevent it from rising over the keyboard? I want it to stay hidden under the keyboard.

I am using bootstrap, but I have set the following stuff in my own CSS:

footer {
 width: 100%;
 position:absolute;
 left:0px;
 bottom:0px;
 height: 40px;
 margin: auto;
 overflow: hidden;
 background:#2E2E2E;
 text-align:center;
 line-height: 15px;
 color: #fff;

}

<html>
 <body>
  <div class="container">
  </div>
  <footer class="bs-footer" role="contentinfo">
 </body>
</html>

As you can see here. When I am activating the field "Salasana", the footer rises and blocks the text field.

Before opening the keyboard:

before

After opening the keyboard:

after

Was it helpful?

Solution

Solved the problem with avinash help. I ended up changing the following in my CSS. Since I have all the content inside the container div I made container height 100% - footer. I also removed bottom:0px from footer.

footer{
 position: relative;
}
html,body {
    height: 100%; /* Needed for container's min-height  */  
}

.container{
    min-height:100%;
    margin-bottom: -40px; /* Put negative height of the footer here */
    padding-bottom: 40px; /* Put height of the footer here. Needed for higher than screen height pages */
}

OTHER TIPS

I found the solution posted here on StackOverflow to be pretty helpful. It includes a javascript snippet that solved the issue for me, pasting below;

if(/Android [4-6]/.test(navigator.appVersion)) {
   window.addEventListener("resize", function() {
      if(document.activeElement.tagName=="INPUT" || document.activeElement.tagName=="TEXTAREA") {
         window.setTimeout(function() {
            document.activeElement.scrollIntoViewIfNeeded();
         },0);
      }
   })
}

Try to use position:relative or fixed

If you want your footer at bottom you should add min-height to body

In case you don't want to change html code, you can try fix this with JS.

We are getting current position from top, setting the top style value, and resetting bottom value.

var fixed = document.querySelector(".fixed"),
    distanceFromTop = fixed.getBoundingClientRect().top;
fixed.style.top = distanceFromTop + 'px';
fixed.style.bottom = 'auto';

For a fixed position footer, I positioned it relative to top instead of bottom:

footer {
  position: fixed;
  height: 40px;
  top: calc(100vh - 40px);
  /* bottom: 0; */
}

I am using use-detect-keyboard-open with React and it works perfectly.

I store window.innerHeight on input focus, and reset height on input blur.

document.addEventListener('focusin', function (e) {
    if (isInputElement(e.target)) {
        document.body.style.height = window.innerHeight + 'px';
    }
})

document.addEventListener('focusout', function (e) {
    if (isInputElement(e.target)) {
        document.body.style.height = '100%';
    }
})

function isInputElement(ele) {
    return ele &&
            ele.tagName === 'INPUT' ||
            ele.tagName === 'TEXTAREA' ||
            ele.getAttribute('contenteditable').toString() === 'true';
}
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