javascript to get paragraph of selected text in we

问题:

After highlighting text, I would like to obtain the paragraph in which the selected text resides.

var select = window._content.document.getSelection();

Any pointers please?

回答1:

This is actually rather hard to do because you have to consider six cases:

1. The selection is not within a paragraph (easy);
2. The entire selection is within one paragraph (easy);
3. The entire selection crosses one or more sibling paragraphs (harder);
4. The selection starts or ends in an element not within a paragraph (harder);
5. The paragraphs spanned are at different levels eg one is within a list item while two others are siblings of the list (even harder); and
6. Some combination of the above.

So firstly you have to decide how complete you want the solution to be. I'll only cover the simplest cases of (1) and (2).

function getSelectedParagraphText() {
  if (window.getSelection) {
      selection = window.getSelection();
  } else if (document.selection) {
      selection = document.selection.createRange();
  }
  var parent = selection.anchorNode;
  while (parent != null && parent.localName != "P") {
    parent = parent.parentNode;
  }
  if (parent == null) {
    return "";
  } else {
    return parent.innerText || parent.textContent;
  }
}

Note: If you're after tags too replace textContent with innerHTML.

Edit: Better version put in, including better browser compatibility.

回答2:

I found this useful example.

It seems that some browsers support window.getSelection() while others support document.getSelection(). The example handle all these cases.

回答3:

select.anchorNode.parentNode will return the parent node, in your case the

tag and you can then get the text of that node.

var x = window.getSelection() 
var z = x.anchorNode.parentNode
alert(z.innerHTML)

Make sure you look at window.getSelection() as well since document.getSelection is depreciated in firefox.

回答4:

$.event.props.push('onTextSelect');
$(document).click(function(){
    var str=window.getSelection().anchorNode.data;
    var str=str.substring(window.getSelection().anchorOffset,window.getSelection().focusOffset);
    if(str)
        $(window.getSelection().focusNode.parentNode).trigger({type:'onTextSelect',text:str});
});

$('p').on('onTextSelect',function(e){
    console.log($(this).attr('class'))
    $('p:last').text(e.text);
});

html

<div><p class="p">some text</p></div>
<p></p>

You can find the fiddle here https://jsfiddle.net/q9nkc0fd/6/

回答5:

A new project is born from jsmatita: http://takenotes.sourceforge.net/ (it's in italian language)