Disabling onclick attribute with javascript

问题:

How do I disable the other onclick event once one of them has been activated. Both divs are set to display:none; in the CSS. This is probably really simple but I am new to programming.

HTML

<a id="leftbutton" href="#" onclick="showDiv(this.id); return false;">click me</a>
<a id="righttbutton" href="#"onclick="showDiv(this.id); return false;">click me</a>

Javascript

function showDiv(id)
{   
  if(id == "leftbutton"){
     document.getElementById('orangediv').style.display = 'block';
     }else{
     document.getElementById('greendiv').style.display = 'block';
}}

回答1:

this should do the trick:

function showDiv(id)
{   
  if(id == "leftbutton"){
     document.getElementById('orangediv').style.display = 'block';
     document.getElementById('righttbutton').onclick = null;
     }else{
     document.getElementById('greendiv').style.display = 'block';
     document.getElementById('leftbutton').onclick = null;
}}

回答2:

Like this for example:

function showDiv(id){   

  if  (id == "leftbutton"){
  document.getElementById('orangediv').style.display = 'block';
  document.getElementById('rightbutton').onclick = "#";
}else{
  document.getElementById('greendiv').style.display = 'block';
  document.getElementById('leftbutton').onclick = "#";
}}

回答3:

Something along these lines:

function showDiv(id){   
var o = document.getElementById('orangediv');
var g = document.getElementById('greendiv');
if  (id == "leftbutton"){
     o.style.display = 'block';
}else{
    g.style.display = 'block';
}
o.writeAttribute('onclick','');
g.writeAttribute('onclick','');
}

回答4:

Just set the onclick property of the other element to null;

if  (id == "leftbutton"){
        document.getElementById('orangediv').style.display = 'block';
        document.getElementById('righttbutton').onclick = null;
    }
    else{
        document.getElementById('greendiv').style.display = 'block';
        document.getElementById('leftbutton').onclick = null;
    }
}

回答5:

function showDiv(id) {
    if ( showDiv.executed ) {
        return false;
    }

    if  ( id === "leftbutton" ) {
       document.getElementById('orangediv').style.display = 'block';
    } else {
       document.getElementById('greendiv').style.display = 'block';
    }

    showDiv.executed = true;
}

showDiv.executed = false;

Doing it this way, you could always re-enable the showing by simply setting showDiv.executed to false.

回答6:

You could test if the other element is displayed :

function showDiv(id)
{ 
  if  (id == "leftbutton" && (document.getElementById('greendiv').style.display == 'none'))
  {
      document.getElementById('orangediv').style.display = 'block';
  }
  else if(id == "rightbutton" && (document.getElementById('orangediv').style.display == 'none'))
  {
      document.getElementById('greendiv').style.display = 'block';
  }
}

回答7:

You can set the href attribute as id of div which should be visibled after you click. showDiv function can get entire element as argument, then you have access to it attributes as well. Second argument can be a id of element you should hide,

   <a id="leftbutton" href="orangediv" onclick="showDiv(this,'rightbutton');return false">click me</a>
   <a id="righttbutton" href="greendiv"onclick="showDiv(this,'leftbutton');return false">click me</a>

And in js:

var showDiv =function(el, toHide){
  document.getElementById( el.href ).style.display = 'block';
  document.getElementById( toHide ).style.display = 'none';
  el.onclick = null; //remove onclick declaration from this anchor.

}