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Javascript function to enable a particular select box option or all the options in a select box



Javascript function to enable a particular select box option or all the options in a select box

Function takes parameters as
selboxId - Id of the select box
selIndex - the index position of the option element to be enabled

JS function to enable a particular select box option by passing its selected index. if no selected Index is passed to the function it enables all the options of select box.

It check whether the selectbox ID is not null
it checks whether the select Index is specified, if not it is set to -1
It checks whether the object is present in the form
It loops through the options in select box
if selected index is -1 then all options are enabled
if select index is given that option alone is enabled

Scroll down for the JS Code:






JS Code



// function to enable a particular select box option by passing its selected index
//if no selected Index is passed to the function it enables all the options of select box

function enableOption(selboxId,selIndex){

//checks whether the select Index is specified, if not it is set to -1

if( !selIndex ) selIndex=-1;

// check whether the selectbox ID is not null

if( selboxId != "" ){

//checks whether the object is present in the form

if( document.getElementById(selboxId) ){

//looping through the options in select box

for( selInd=0; selInd < document.getElementById(selboxId).options.length ; selInd++ ){

//if selected index is -1 then all options are enabled

if( selIndex < 0 )
document.getElementById(selboxId).options[selInd].disabled=false;
else{

//if select index is given that option alone is enabled

if( selInd == selIndex )
document.getElementById(selboxId).options[selInd].disabled=false;
else
document.getElementById(selboxId).options[selInd].disabled=true;
}
}

}

}

}


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