a more graceful multi-line javascript string method_问答_开发者

The only way I know how to print a huge string without using += is to use \ backslashes. ugly!

<div id="foo"></div>
<script type="text/javascript">
var longString = '<div id="lol">\
        <div id="otherstuff">\
            test content. maybe some code\
        </div>\
    </div>';

document.getElementById('foo').innerHTML = longString;
</script>

is there any way to do this where the longString is untainted? php has $foo = ''' long multiline string '''; I want thi开发者_如何学Pythons in javascript!

Anyone know of a better method for printing long, multi-line strings in javascript?

In general, the answer is: not in the language syntax. Though as Ken pointed out in his answer there are many work-arounds (my personal method is to load a file via AJAX). In your specific case though, I'd prefer creating a HTML constructor function so you can then define the HTML structure using javascript object literals. Something like:

var longString = makeHTML([{
  div : {
    id : "lol",
    children : [{
      div : {
        id : "otherstuff",
        children : [{
            text : "test content. maybe some code"
        }]
    }]
 }]

which I find to be much easier to handle. Plus, you this would allow you to use real function literals when you need it to avoid string quoting hell:

makeHTML([{
  span : {
    onclick : function (event) {/* do something */}
  }
}]);

note: the implementation of makeHTML is left as exercise for the reader

Additional answer:

Found some old code after a quick scan through my hard disk. It's a bit different from what I suggested above so I thought I'd share it to illustrate one of the many ways you can write functions like this. Javascript is a very flexible language and there is not much that forces you to write code one way or another. Choose the API you feel most natural and comfortable and write code to implement it.

Here's the code:

function makeElement (tag, spec, children) {
    var el = document.createElement(tag);
    for (var n in spec) {
        if (n == 'style') {
            setStyle(el,spec[n]);
        }
        else {
            el[n] = spec[n];
        }
    }
    if (children && children.length) {
        for (var i=0; i<children.length; i++) {
            el.appendChild(children[i]);
        }
    }
    return el;
}

/* implementation of setStyle is
 * left as exercise for the reader
 */

Using it would be something like:

document.getElementById('foo').appendChild(
  makeElement(div,{id:"lol"},[
    makeElement(div,{id:"otherstuff"},[
      makeText("test content. maybe some code")
    ])
  ])
);

/* implementation of makeText is
 * left as exercise for the reader
 */

One technique if you have a big block is a <script> tag with an invalid type. It will be ignored by browsers.

<script type="text/x-my-stuff" id="longString">
    <div id="lol">
        <div id="otherstuff">
            test content. maybe some code
        </div>
    </div>
</script>
<script type="text/javascript">
    var longString = document.getElementById("longString").text;
    document.getElementById('foo').innerHTML = longString;
</script>

A few somewhat unattractive options are discussed in the answers to this question.

You really could minimize this ugliness by creating your <div id="lol"> as HTML, and set its content with .innerHTML = "test content. maybe some code"

I don't like creating HTML in Javascript because of this exact issue, and instead use "template" elements which i simply clone then manipulate.

var lol = document.getElementById("template_lol").clone();
lol.firstChild.innerHTML = "code and stuff";
foo.appendChild(lol);

And this is the HTML:

<body>
<div>normal stuff</div>

<div style="display:none" id="templateBucket">
  <div id="template_lol"><div class="otherstuff"></div></div>
</div>
</body>

This works too :

var longString = 
  '<div id="lol">' +
    '<div id="otherstuff">' +
      'test content. maybe some code' +
    '</div>' +
  '</div>';

a more graceful multi-line javascript string method

Additional answer:

精彩评论

关注公众号

热门标签

图文推荐

a more graceful multi-line javascript string method

Additional answer:

更多 问答 相关资讯：

精彩评论

关注公众号

热门标签

图文推荐

更多问答相关资讯：