ckeditor - 获取当前光标位置的前一个字符

Question

如何在ckeditor中获取当前光标位置的前一个字符？例如,假设'|' char是"Hello | World"文本中的光标位置,然后我想得到"o"字符.

Answer 1

鉴于这editor是其中之一CKEDITOR.instances,以下应该做的伎俩:

function getPrevChar() {
    var range = editor.getSelection().getRanges()[ 0 ],
        startNode = range.startContainer;

    if ( startNode.type == CKEDITOR.NODE_TEXT && range.startOffset )
        // Range at the non-zero position of a text node.
        return startNode.getText()[ range.startOffset - 1 ];
    else {
        // Expand the range to the beginning of editable.
        range.collapse( true );
        range.setStartAt( editor.editable(), CKEDITOR.POSITION_AFTER_START );

        // Let's use the walker to find the closes (previous) text node.
        var walker = new CKEDITOR.dom.walker( range ),
            node;

        while ( ( node = walker.previous() ) ) {
            // If found, return the last character of the text node.
            if ( node.type == CKEDITOR.NODE_TEXT )
                return node.getText().slice( -1 );         
        }
    }

    // Selection starts at the 0 index of the text node and/or there's no previous text node in contents.
    return null;
}

检查jsFiddle.尝试一下:将插入符号放在任何地方,但大部分时间^都要看看是否覆盖了棘手的案例.