How to force a script reload and re-execute?

I have a page that is loading a script from a third party (news feed). The src url for the script is assigned dynamically on load up (per third party code).

<div id="div1287">
    <!-- dynamically-generated elements will go here. -->
</div>

<script id="script0348710783" type="javascript/text">
</script>

<script type="javascript/text">
    document.getElementById('script0348710783').src='http://oneBigHairyURL';
</script>

The script loaded from http://oneBigHairyURL then creates and loads elements with the various stuff from the news feed, with pretty formatting, etc. into div1287 (the Id "div1287" is passed in http://oneBigHairyURL so the script knows where to load the content).

The only problem is, it only loads it once. I'd like it to reload (and thus display new content) every n seconds.

So, I thought I'd try this:

<div id="div1287">
    <!-- dynamically-generated elements will go here. -->
</div>

<script id="script0348710783" type="javascript/text">
</script>

<script type="javascript/text">
    loadItUp=function() {
        alert('loading...');
        var divElement = document.getElementById('div1287');
        var scrElement = document.getElementById('script0348710783');

        divElement.innerHTML='';
        scrElement.innerHTML='';
        scrElement.src='';
        scrElement.src='http://oneBigHairyURL';
        setTimeout(loadItUp, 10000);
    };
    loadItUp();
</script>

I get the alert, the div clears, but no dynamically-generated HTML is reloaded to it.

Any idea what I'm doing wrong?

Kelly

How about adding a new script tag to <head> with the script to (re)load? Something like below:

<script>
   function load_js()
   {
      var head= document.getElementsByTagName('head')[0];
      var script= document.createElement('script');
      script.src= 'source_file.js';
      head.appendChild(script);
   }
   load_js();
</script>

The main point is inserting a new script tag -- you can remove the old one without consequence. You may need to add a timestamp to the query string if you have caching issues.

Here's a method which is similar to Kelly's but will remove any pre-existing script with the same source, and uses jQuery.

<script>
    function reload_js(src) {
        $('script[src="' + src + '"]').remove();
        $('<script>').attr('src', src).appendTo('head');
    }
    reload_js('source_file.js');
</script>

Note that the 'type' attribute is no longer needed for scripts as of HTML5. (http://www.w3.org/html/wg/drafts/html/master/scripting-1.html#the-script-element)

Have you tried removing it from the DOM, then inserting it back again?

I just did, that doesn't work. However, creating a new script tag and copying the contents of the existing script tag, then adding it, works well.

See my example http://jsfiddle.net/mendesjuan/LPFYB/

var scriptTag = document.createElement('script');
scriptTag.innerText = "document.body.innerHTML += 'Here again ---<BR>';";
var head = document.getElementsByTagName('head')[0];
head.appendChild(scriptTag);

setInterval(function() {
    head.removeChild(scriptTag);
    var newScriptTag = document.createElement('script');
    newScriptTag.innerText = scriptTag.innerText;
    head.appendChild(newScriptTag);
    scriptTag = newScriptTag;    
}, 1000);

This won't work if you expect the script to change every time, which I believe is your case. You should follow Kelly's suggestion, just remove the old script tag (just to keep the DOM slim, it won't affect the outcome) and reinsert a new script tag with the same src, plus a cachebuster.

Maleen Abewardana

Small tweak to Luke's answer,

 function reloadJs(src) {
    src = $('script[src$="' + src + '"]').attr("src");
    $('script[src$="' + src + '"]').remove();
    $('<script/>').attr('src', src).appendTo('head');
}

and call it like,

reloadJs("myFile.js");

This will not have any path related issues.

Use this function to find all script elements containing some word and refresh them.

function forceReloadJS(srcUrlContains) {
  $.each($('script:empty[src*="' + srcUrlContains + '"]'), function(index, el) {
    var oldSrc = $(el).attr('src');
    var t = +new Date();
    var newSrc = oldSrc + '?' + t;

    console.log(oldSrc, ' to ', newSrc);

    $(el).remove();
    $('<script/>').attr('src', newSrc).appendTo('head');
  });
}

forceReloadJS('/libs/');

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

来源：https://stackoverflow.com/questions/9642205/how-to-force-a-script-reload-and-re-execute

标签

javascript

html

news-feed

script-tag