突出显示DOM范围元素的文本,

Question

我能够突出显示HTML页面上的文本(通过gtkmozembed呈现),如下所示.

    var range, sel;
    if (window.getSelection) {
        sel = window.getSelection();
        if (sel.getRangeAt) {
          range = sel.getRangeAt(0);
        }
        document.designMode = "on";
        if (range) {
            sel.removeAllRanges();
            sel.addRange(range);
        }
        document.execCommand("HiliteColor", false, colour);
        document.designMode = "off";
   }  

好吧,它工作得很好.现在我正在尝试存储有关突出显示文本的信息(startNode,startOffset,endNode,endOffset),下次当我打开同一页面时,突出显示相同的文本.我能够成功存储信息并在同一页面打开时检索它们.我试图使用以下代码突出显示文本.

    var range = document.createRange();
    range.setStart(startNode, startOffset);
    range.setEnd(endNode, endOffset);

    document.designMode = "on";
    range.execCommand("HiliteColor", false, colour);
    document.designMode = "off";

但它并没有像我期待的那样发挥作用.任何人都可以帮助我达到要求吗？谢谢...

Answer 1

该execCommand方法是文档的方法,而不是Range.此外,hilitecolor仅适用于Firefox,因此您应该回归使用backcolorWebKit和Opera.

UPDATE

在IE 9中修复.

function makeEditableAndHighlight(colour) {
    var sel = window.getSelection();
    var range = null;
    if (sel.rangeCount && sel.getRangeAt) {
        range = sel.getRangeAt(0);
    }
    document.designMode = "on";
    if (range) {
        sel.removeAllRanges();
        sel.addRange(range);
    }
    // Use HiliteColor since some browsers apply BackColor to the whole block
    if (!document.execCommand("HiliteColor", false, colour)) {
        document.execCommand("BackColor", false, colour);
    }
    document.designMode = "off";
}

function highlight(colour) {
    var range, sel;
    if (window.getSelection) {
        // IE9 and non-IE
        try {
            if (!document.execCommand("BackColor", false, colour)) {
                makeEditableAndHighlight(colour);
            }
        } catch (ex) {
            makeEditableAndHighlight(colour)
        }
    } else if (document.selection && document.selection.createRange) {
        // IE <= 8 case
        range = document.selection.createRange();
        range.execCommand("BackColor", false, colour);
    }
}