Count, plus, minus \ Float - pure js

by tripcollor

HTML

<div class="wr">
    <div>
        <span id="bminus">–</span><input type="text" id="count" value="0.1 кг" /><span id="bplus">+</span>
    </div>
</div>

CSS

.wr {
    margin: 50px;
    position: relative;
    border: 2px solid #06c106;
    padding: 5px 10px;
    width: 130px;
    overflow: hidden;
    
}
.wr input {
    display: block;
    padding: 8px;
    width: 50px;
    text-align: center;
    border: 2px solid #c00;
    outline: none;
    float: left;
}
#bminus,
#bplus {
    float: left;
    display: block;
    font-size: 26px;
    padding: 5px 8px;
    font-weight: bolder;
    cursor: pointer;
    color: #d00;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

JavaScript

var wrapper = document.querySelector('wr');
var countInput = document.getElementById('count');
var butM = document.getElementById('bminus');
var butP = document.getElementById('bplus');
var units = ' '+countInput.value.split(' ')[1];

var floatNum;
butP.onclick = function(){
    floatNum = parseFloat(countInput.value) + 0.1;
    floatNum = floatNum.toFixed(1);
    countInput.value = floatNum+units;
};
butM.onclick = function(){
    if(parseFloat(countInput.value) > .1) {
        floatNum = parseFloat(countInput.value) - 0.1;
        floatNum = floatNum.toFixed(1);
        countInput.value = floatNum+units;
    }
};