First word selector

问题:

How can I select the first word in a div?

I need to be able to insert a line break after the first word, or wrap it in a span tag. I need to do this for multiple divs on a page with the same class.

回答1:

Replacing HTML will result in event handlers being unbound and replacing the entire text for an element will result in HTML markup being lost. The best approach leaves any HTML untouched, manipulating only the first text node of the matching element. To get that text node, you can use .contents() and .filter():

function wrapFirstWord () { 
    // Select only the first text node
    var node = $("div").contents().filter(function () { 
            return this.nodeType == 3;
        }).first(),

    // Get the text... 
        text = node.text(),

    // ... and the first word
        first = text.slice(0, text.indexOf(" "));

    if (!node.length)
        return;

    // Remove the first word from the text
    node[0].nodeValue = text.slice(first.length);

    // Add it back in with HTML around it
    node.before('<span>' + first + '</span><br/>');
};

Working demo: http://jsfiddle.net/9AXvN/

Using this method will ensure that manipulating the first word will have no unwanted side effects on the rest of the element's content.

---

You can easily tack this on as an extension to jQuery, with an optional value for the number of words you want to wrap:

$.fn.wrapStart = function (numWords) { 
    var node = this.contents().filter(function () { 
            return this.nodeType == 3 
        }).first(),
        text = node.text(),
        first = text.split(" ", numWords).join(" ");

    if (!node.length)
        return;

    node[0].nodeValue = text.slice(first.length);
    node.before('<span>' + first + '</span><br/>');
};

Working demo: http://jsfiddle.net/9AXvN/1/

回答2:

This should work:

$('div.message').each(function() {
   var html = $(this).html();
   var word = html.substr(0, html.indexOf(" "));
   var rest = html.substr(html.indexOf(" "));
   $(this).html(rest).prepend($("<span/>").html(word).addClass("em"));
});

JSFiddle

回答3:

Now I now this has already been answered, but I am very new to jquery and thought I would give it a go. Comments please!

$('div.message').each(function(index) {
    //get the first word
    var firstWord = $(this).text().split(' ')[0];

    //wrap it with span
    var replaceWord = "<span class='myClass'>" + firstWord + "</span>";

    //create new string with span included
    var newString = $(this).html().replace(firstWord, replaceWord);

    //apply to the divs
    $(this).html(newString);
});

回答4:

basicly you can do like this

$('ELEMENT_SELECTOR').text().split(' ')[0]

回答5:

This may help you

First Word in String with jquery

$('div.message').text(function(i,txt) {
    var name = $('div.name').text().split(' ')[ 0 ];   
});

回答6:

Actually, if you want to use it as a plugin, so that it would do it for all the items in the selector, not only the first one, use this one:

$.fn.wrapStart = function(numWords){
    return this.each(function(){
        $this = $(this);
        var node = $this.contents().filter(function(){
            return this.nodeType == 3
        }).first(),
        text = node.text(),
        first = text.split(" ", numWords).join(" ");
        if (!node.length) return;
        node[0].nodeValue = text.slice(first.length);
        node.before('<span>' + first + '</span>');
    });
};

http://jsfiddle.net/rxAMF/

回答7:

/*
URL → https://github.com/melbon/jquery.useWord
*/
$.fn.lastWord = function() {
  var text = this.text().trim().split(" ");
  var last = text.pop();
  this.html(text.join(" ") + (text.length > 0 ? " <span class='lastWord'>" + last + "</span>" : last));
};


$.fn.firstWord = function() {
  var text = this.text().trim().split(" ");
  var first = text.shift();
  this.html((text.length > 0 ? "<span class='firstWord'>"+ first + "</span> " : first) + text.join(" "));
};


$("#firstWord").firstWord();
$("#lastWord").lastWord();