首先监听所有的input,有input聚焦时调起数字键盘,通过getBoundingClientRect判断input位置让数字键盘在input附近,失去焦点后则隐藏数字键盘
let inputElement = document.getElementsByTagName("input"); [...inputElement].forEach(ipele => { ipele.addEventListener("focus", function(e) { $this.inputTarget = e.target; let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop; let scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft; $this.NumberkeyBoardStyle = "top:" + (e.target.getBoundingClientRect().top + scrollTop + e.target.offsetHeight) + "px;left:" + (e.target.getBoundingClientRect().left + scrollLeft + e.target.offsetWidth) + "px"; }); ipele.addEventListener("blur", function(e) { $this.inputTarget = null; $this.NumberkeyBoardStyle = "display:none"; }); });
点击小键盘时阻止默认事件,阻止input失去焦点。
BoardNumberKeyDown(e) { if (e && e.preventDefault) { e.preventDefault(); } else { window.event.returnValue = false; return false; } },
点击小键盘时,根据事件委托,得出点击的数字,然后根据selectionStart,selectionEnd获取input中的焦点,将小键盘中的数字插入焦点处,最后焦点右移一位。
let inputTarget = this.inputTarget; let Pointstart = inputTarget.selectionStart; let PointEnd = inputTarget.selectionEnd; let wordLength = inputTarget.value.length; if (e.target.className == "numberTD" && e.target.innerText != "←") { inputTarget.value = inputTarget.value.slice(0, Pointstart) + e.target.innerText + inputTarget.value.slice(PointEnd, wordLength); //一个小数点和开头不能有小数点 inputTarget.value = inputTarget.value.replace(/^\./g, ""); inputTarget.value = inputTarget.value .replace(".", "$#$") .replace(/\./g, "") .replace("$#$", "."); inputTarget.selectionStart = Pointstart + 1; inputTarget.selectionEnd = Pointstart + 1; //让光标显示在input可视区域 inputTarget.blur(); inputTarget.focus();
点击删除键时,删除光标处数字,最后光标右移。
if (e.target.className == "numberTD" && e.target.innerText == "←" && //PointEnd==0时会复制整个input的value PointEnd != 0 ) { inputTarget.value = inputTarget.value.slice(0, Pointstart - 1) + inputTarget.value.slice(PointEnd, wordLength); inputTarget.selectionStart = Pointstart - 1; inputTarget.selectionEnd = Pointstart - 1; //让光标显示在input可视区域 inputTarget.blur(); inputTarget.focus(); }
在删除数字和添加数字后要让input失去焦点在获取焦点,不然光标会在最后而不是在input的可视区域,这样子会看不到输入的值,具体可以查看项目。