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Getting Error: DROPDOWN is not a function - Works in IE9

  • 1 (رد واحد)
  • 1 has this problem
  • 5 views
  • آخر ردّ كتبه cor-el

mark.ebling
mark.ebling
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I'm trying to remove the default value selected in a drop-down box.

The call to the function is this: onchange="javascript:Remove_Default_Value(this);"

Here is the function: 

function Remove_Default_Value(DROPDOWN) {
 var i = DROPDOWN.options.length - 1;  
 for ( i; i >= 0; i--)   
 {  
  DROPDOWN(i).defaultSelected = false;
 }  
}

The error I'm getting is "DROPDOWN is not a function".

Any ideas is greatly appreciated.

I'm trying to remove the default value selected in a drop-down box. The call to the function is this: onchange="javascript:Remove_Default_Value(this);" Here is the function: <pre><nowiki>function Remove_Default_Value(DROPDOWN) { var i = DROPDOWN.options.length - 1; for ( i; i >= 0; i--) { DROPDOWN(i).defaultSelected = false; } } </nowiki></pre> The error I'm getting is "DROPDOWN is not a function". Any ideas is greatly appreciated.

Modified by cor-el

الحل المُختار

It is not a function, but an array and you also need to use getElementsByTagName()

function Remove_Default_Value(DROPDOWN) {
 var i = DROPDOWN.getElementsByTagName("option").length - 1;  
 for ( i; i >= 0; i-- )   
 {  
  DROPDOWN.getElementsByTagName("option")[i].defaultSelected = false;
 }  
}

A good place to ask advice about web development is at the MozillaZine "Web Development/Standards Evangelism" forum.

The helpers at that forum are more knowledgeable about web development issues.
You need to register at the MozillaZine forum site in order to post at that forum.

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All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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الحل المُختار

It is not a function, but an array and you also need to use getElementsByTagName()

function Remove_Default_Value(DROPDOWN) {
 var i = DROPDOWN.getElementsByTagName("option").length - 1;  
 for ( i; i >= 0; i-- )   
 {  
  DROPDOWN.getElementsByTagName("option")[i].defaultSelected = false;
 }  
}

A good place to ask advice about web development is at the MozillaZine "Web Development/Standards Evangelism" forum.

The helpers at that forum are more knowledgeable about web development issues.
You need to register at the MozillaZine forum site in order to post at that forum.