ajax - Javascript code to preventDefault for all <a href> links - Stack Overflow

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I am trying to get URLs to change using only Javascript, by updating the content via AJAX.

This is to prevent certain content (namely music, chat message boxes, etc) from refreshing and either

1. Clearing the place where your music is playing
2. Resetting something you are working on, like typing a message.

I just began today trying to implement something like this, and so far I've got this:

var a = document.querySelectorAll('a')
for (var i=0; i<a.length; i++) {
   a[i].addEventListener('click',function(event){event.preventDefault();};
}
return false

However, this code

1. Doesn't allow the url to be changed
2. Doesn't load the AJAX.

My question is: how do I cancel the age from refreshing, but still allow the url to change?

I am trying to get URLs to change using only Javascript, by updating the content via AJAX.

This is to prevent certain content (namely music, chat message boxes, etc) from refreshing and either

1. Clearing the place where your music is playing
2. Resetting something you are working on, like typing a message.

I just began today trying to implement something like this, and so far I've got this:

var a = document.querySelectorAll('a')
for (var i=0; i<a.length; i++) {
   a[i].addEventListener('click',function(event){event.preventDefault();};
}
return false

However, this code

1. Doesn't allow the url to be changed
2. Doesn't load the AJAX.

My question is: how do I cancel the age from refreshing, but still allow the url to change?

• javascript
• ajax
• preventdefault

Share Improve this question Follow edited Jul 18, 2014 at 0:38 Oriol 289k7171 gold badges457457 silver badges530530 bronze badges asked Jul 18, 2014 at 0:29 Tim PowellTim Powell 12711 silver badge1111 bronze badges 1

• getElementsByTagName is faster than querySelectorAll. And avoid inline functions inside loops, at each iteration you create a duplicate function. – Oriol Commented Jul 18, 2014 at 0:34

Add a ment  | 

5 Answers 5

Sorted by: Reset to default 3

Try something like

var a = document.getElementsByTagName('a'),
    ajax;
for (var i=0; i<a.length; ++i) {
   a[i].addEventListener('click', handleAnchor, false);
}
function handleAnchor(e){
    e.preventDefault();
    if(ajax) ajax.abort();
    ajax = new XMLHttpRequest();
    ajax.onload = updateContent;
    ajax.open("get", this.href, true);
    ajax.send();
}
function updateContent() {
    // Do something with `this.responseText`
}

You can try a hash based url scheme:

someurl/#param1

someurl/#param2

...

var anchors = document.getElementsByTagName('a');

for(var i=0; i < anchors.length; i++) {
    addEvent(anchors[i], 'click', preventDefault);
}

function preventDefault(e) {
    e = e || window.event;
   (e.preventDefault)? 
       e.preventDefault() : e.returnValue = false;
}

function addEvent(obj, evType, fn){ 
   if (obj.addEventListener){ 
       obj.addEventListener(evType, fn, false); 
       return true; 
   } 
   else if (obj.attachEvent){ 
       var r = obj.attachEvent("on"+evType, fn); 
       return r; 
 } else { 
       return false; 
 } 
}

Give this a try found this at prevent default for all links inside a div using jquery

Try (this pattern) , utilizing jquery .load()

html

<div class="1">content 1</div><div class="2">content 2</div>
<a class="1" href="#">update 1</a>
<a class="2" href="#">update 2</a>

js

$(function() {
var url = "http://example";
    $("a").each(function(i, el) {
        $(this).on("click", function(e) {
          e.preventDefault();
            if (i === 0) {
              $("div.1")
              .load(url + " #" + $(el).attr("class"));
             };
            if (i === 1) {
              $("div.2")
              .load(url + " #" + $(el).attr("class"));
            };
        })
    });
});

jsfiddle http://jsfiddle/guest271314/dL4b4/

Please try

 $("a[href=#]").click(function (e) {
    e.preventDefault();
 })

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