Question

我想在使用javascript在textarea中输入时，用Devanagari Danda（。）替换Vertical Bar（|）。

首先，我尝试了在How to change characters typed in Firefox上给出的解决方案。但它只是将角色添加到最后。

所以，我遵循了http://www.jsfiddle.net/EXH2k/6/给出的解决方案，这是Tim Down在Changing the keypress以及show different keyboard character from the typed one in google chrome上提出的建议。但它对我不起作用（无论是在Firefox还是在IE 10中）。

代码：

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <link type="text/css" rel="stylesheet" href="stylesheet.css" />
    <script type="text/javascript">
        function transformTypedChar(charStr) {
            return charStr == "|" ? "।" : charStr;
        }

        function getInputSelection(el) {
            var start = 0, end = 0, normalizedValue, range,
            textInputRange, len, endRange;

            if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
                start = el.selectionStart;
                end = el.selectionEnd;
            } else {
                range = document.selection.createRange();

                if (range && range.parentElement() == el) {
                    len = el.value.length;
                    normalizedValue = el.value.replace(/\r\n/g, "\n");

                    // Create a working TextRange that lives only in the input
                    textInputRange = el.createTextRange();
                    textInputRange.moveToBookmark(range.getBookmark());

                    // Check if the start and end of the selection are at the very end
                    // of the input, since moveStart/moveEnd doesn't return what we want
                    // in those cases
                    endRange = el.createTextRange();
                    endRange.collapse(false);

                    if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
                        start = end = len;
                    } else {
                        start = -textInputRange.moveStart("character", -len);
                        start += normalizedValue.slice(0, start).split("\n").length - 1;

                        if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
                            end = len;
                        } else {
                            end = -textInputRange.moveEnd("character", -len);
                            end += normalizedValue.slice(0, end).split("\n").length - 1;
                        }
                    }
                }
            }

            return {
                start: start,
                end: end
            };
        }

        function offsetToRangeCharacterMove(el, offset) {
            return offset - (el.value.slice(0, offset).split("\r\n").length - 1);
        }

        function setInputSelection(el, startOffset, endOffset) {
            el.focus();
            if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
                el.selectionStart = startOffset;
                el.selectionEnd = endOffset;
            } else {
                var range = el.createTextRange();
                var startCharMove = offsetToRangeCharacterMove(el, startOffset);
                range.collapse(true);
                if (startOffset == endOffset) {
                    range.move("character", startCharMove);
                } else {
                    range.moveEnd("character", offsetToRangeCharacterMove(el, endOffset));
                    range.moveStart("character", startCharMove);
                }
                range.select();
            }
        }

        $("#inputTextArea").keypress(function (evt) {
            if (evt.which) {
                var charStr = String.fromCharCode(evt.which);
                var transformedChar = transformTypedChar(charStr);
                if (transformedChar != charStr) {
                    var sel = getInputSelection(this), val = this.value;
                    this.value = val.slice(0, sel.start) + transformedChar + val.slice(sel.end);

                    // Move the caret
                    setInputSelection(this, sel.start + 1, sel.start + 1);
                    return false;
                }
            }
        });
    </script>
</head>
<body>
    <textarea name="input" id="inputTextArea" rows="10"></textarea>
</body>
</html>

Answer 1

这很简单。使用新行处理等丢弃您的代码，然后执行此操作：

$(document).ready(function() {
    $('#my-input').on('input', function() {
        var $input = $(this),
            curVal = $input.val();
        var cursorPos = curVal.slice(0, this.selectionStart).length;

        $input.val(curVal.replace(/[|]/g, '।'));
        this.setSelectionRange(cursorPos, cursorPos);
    });
});

工作示例：JSFiddle

Answer 2

我想尽快用Devanagari Danda（。）替换Vertical Bar（|）因为它是使用javascript在textarea中键入的。

由于您希望在键入字符后立即替换字符，这可能是最简单的选项：

$('#inputTextArea').on("keyup", function(e) {
    $(this).val($(this).val().replace(/[|]/g, "।"));
});

我注意到虽然你没有标记jQuery，但你在代码中使用了jQuery。因此，基于jQuery的解决方案。

快速小提琴：http://jsfiddle.net/THEre/

只要在textarea中输入，就用Devanagari Danda（“。”）替换垂直条（“|”）

2 个答案: