accounting.js 将光标保持在十进制值的末尾

accounting.js keeps cursor at end for decimal values

我正在使用 accoungting.js 插件来格式化货币。唯一的问题是,它会在键入任何内容后立即将光标置于值的末尾,并且由于我为 currency 保留了 2 个小数精度,所以它阻止我键入更多内容。我没有找到任何用于在您键入后立即编辑值的来源。我怎样才能使这项工作?找到任何解决方法或破解方法?

<input autocomplete="off" type="text" id="Price"/>

JS

var options = {
    symbol : "£",
    decimal : ".",
    thousand: ",",
    precision : 2,
    format: "%s%v"
};

$("#Price")
  .on("input",
    function() {
      var _this = $(this);
      debugger;
      var val = _this.val().startsWith("£") ? _this.val().split("£")[1] : _this.val();
      var value=accounting.formatMoney(val,options);
      _this.val(value);
});

Demo

完全重新编辑
(为清楚起见)

我认为这是 accounting.js.
的一种错误修复
问题在于输入字段中 keyup(或此处的 input 事件)上使用时的光标位置。

在此解决方案中,我切换回 keyup 事件,因为 - 奇怪的是 - input 事件不提供 keycode 号码。

这是最终的解决方案

添加我的这个小脚本 (部分来自 SO 答案和一些工作,大约 1 年前......不记得来源)

// ---------------------------------------------------------------------------  What is the browser ?

var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    // Opera 8.0+ (UA detection to detect Blink/v8-powered Opera)
var isFirefox = typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
    // At least Safari 3+: "[object HTMLElementConstructor]"
var isChrome = !!window.chrome && !isOpera;              // Chrome 1+
var isIE = /*@cc_on!@*/false || !!document.documentMode; // At least IE6

function GetCursorPos (field) {
    // Initialize
    iCaretPos = 0;

    if (isIE){  //(document.selection) {

        // Set focus on the element
        field.focus();

        // To get cursor position, get empty selection range
        oSel = field.createTextRange();

        // Move selection start to 0 position
        oSel.moveStart('character', -field.value.length);

        // The caret position is selection length
        iCaretPos = oSel.text.length;
    }
    if (isChrome||isSafari){    //(field.selectionStart || field.selectionStart == '0')
        iCaretPos = field.selectionStart;
    }
    if (isFirefox){
        iCaretPos = field.selectionStart;
    }

    return iCaretPos;
}

function SetCursorPos (field,Pos) {
    // Set focus on the element
    field.focus();

    if (isIE){
        field.selectionStart=Pos;
    }
    if (isChrome||isSafari){
        field.setSelectionRange(Pos,Pos);
    }
    if (isFirefox){
        field.selectionStart=Pos;
    }
    return;
}

那么,正是针对accounting.js,管理onkeyup值更新的方式是:

$("#Price")
.on('keyup', function (event) {
    var val = this.value;
    var x = event.keyCode;                  // Get the keycode for backspace check
    var offset=0;                           // Set the offset to zero by default.

    if(((x>=96)&&(x<=105))||((x>=37)&&(x<=40))||(x==8)||(x==46)){   // Allow digits from 0 to 9 AND arrows AND backspace AND Delete

        var dotPos = val.indexOf(".");          // Check for dot position.
        var offsetComa = val.length%4;          // Variable used to check if a coma is to be added.

        // Offset conditions
        if(val.length==1){
            offset=1;                           // When the first digit is entered in the field, it's time to offset by 1 for the "£" to be added.
        }
        if(val.length>1){
            if(offsetComa==0){                  // when there is no remainder of val.length/4, it's time to offset 1 for the coma to be added.
                offset=1;
            }
            if((offsetComa==0)&&((x==46)||(x==8))){ // when there is no remainder of val.length/4, BUT WE REMOVED A CHARACTER.  offset -1 for the coma to be added.
                offset=-1;
            }
            if(dotPos==1){                      // If dot is right after "£" => user has backspaced!
                val="";                         // Consider val as empty!
            }
            if(dotPos==-1){                     // If no dot present reinsert it!
                val = val.slice(0, cursorPos-1) + "." + val.slice(cursorPos);
            }
            if(cursorPos==val.length-2){        // If inputting the second decimal, remove the possible third to avoid rounding.
                val = val.slice(0, cursorPos+1);
            }
            if(cursorPos==val.length-3){        // If inputting decimals, clear offset.
                offset=0;
                val = val.slice(0, val.length-1)
            }
        }

    }else{                                      // Removes any non-digit character
        if(x!=8){
            cursorPos = GetCursorPos(this);
            val = val.slice(0, cursorPos-1) + val.slice(cursorPos);


            if(val.charAt(cursorPos-1)=="."){   // decimal point
                cursorPos+=1;
            }

            this.value = val;
            SetCursorPos(this,cursorPos-1);
        }
    }

    var hasCurrencySymbol = val.startsWith('£');
    var formatted = accounting.formatMoney(val.substr(hasCurrencySymbol ? 1 : 0), options);
    if(formatted=="£0.00"){
        formatted=""                        // Empty the field instead of showing the problematic "£0.00"
    }

    cursorPos = GetCursorPos(this);         // Get previous cursor position
    this.value = formatted;                        // Return the value to field
    SetCursorPos(this,cursorPos+offset);    // Correct cursor position
});



它管理一个计算出的游标偏移 onkeyup。
它还管理 backspace/delete «反向偏移»。
可以输入小数。

奖励,它会立即删除所有非数字字符。
:D

看看final Fiddle here

当您以编程方式更改输入值时,您还需要恢复光标位置,因为浏览器会丢失该信息。

最简单的方法是只恢复更改前使用的位置。

// pseudocode
.on('input', function () {
    var cursorPosition = this.selectionEnd;

    var val = this.value;
    var hasCurrencySymbol = val.startsWith('£');
    var formatted = accounting.formatMoney(val.substr(hasCurrencySymbol ? 1 : 0), options);

    this.value = formatted;
    this.setSelectionRange(cursorPosition, cursorPosition);
});

但可能更希望将光标放在刚刚插入的数字之后。下面的代码将最后记住的光标位置移动新旧输入文本之间的长度差异,这不是理想的解决方案(尤其是对于第一个插入的数字),但是是进一步改进的良好起点。

.on('input', function () {
    var cursorPosition = this.selectionEnd;

    var val = this.value;
    var hasCurrencySymbol = val.startsWith('£');
    var formatted = accounting.formatMoney(val.substr(hasCurrencySymbol ? 1 : 0), options);
    var lengthDiff = formatted.length - val.length;

    this.value = formatted;
    this.setSelectionRange(cursorPosition + diff, cursorPosition + diff);
});

代码使用setSelectionRange,所有流行的浏览器(包括IE9+)都支持