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  • Status: Solved
  • Priority: Medium
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history.go(-1)

In my page, there is a BACK button, when user click it, I call javascript:history.go(-1). The problem
is when there is nothing to go back, I want to hide this BACK button(or disable it).
Thanks!
0
apig
Asked:
apig
  • 3
1 Solution
 
trekkeeCommented:
the button object in HTML has a "Visible" property, and a "Disabled" property you can use.  

Just test if history.go(-1) = '' or the length(history.go(-1)) = 0 and if so set myButton.Visible = false.

This should work for you.
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apigAuthor Commented:
yes I agree with you but the question is how to write the code.

It is not a button, it is a image.

Here is my code related to this issue, it always get an "syntax error". Thanks for any further advice.

<script language=Javascript>
<!--
function MM_showHideLayers() {
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

//-->
</script>



<div id=layer1  style="VISIBILITY: hidden"><a href="#">
<img src="/Hr/ourpeople/whoswho/images/Back_2.gif" width="70" height="26" border="0" onclick="JavaScript:history.go(-1)"></a>
</div>

<script language=JavaScript>
if (history.go(-1)) ! = "")
{ MM_showHideLayers('layer1','','show');}
</script>    
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apigAuthor Commented:
Now I modified the last part of the code as following, there is no more syntax error any more. But the BACK button now will be there as long as the length of this history is not 0. What I want is to hide it whenever there is nothing to go back.

<script language=JavaScript>
if (history.length != 0) { MM_showHideLayers('layer1','','show');}
</script>    
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apigAuthor Commented:
Hi I found out a way to work around it. In fact I don't think I explained my question very well.

Anyway thanks.
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