how to activate a textbox if I select an other option in drop down box

Question

suppose I\'ve a 3 options in a drop down box say red , blue, others. If a user select option as an others then below a text box should be visible to wrtie his own favour

Answer 1

Inline:

I used to do this

In the head (give the select an ID):

window.onload=function() {
  var sel = document.getElementById('color');
  sel.onchange=function() {
    var val = this.options[this.selectedIndex].value;
    if (val == 'others') {
      var newOption = prompt('Your own color','');
      if (newOption) {
        this.options[this.options.length-1].text = newOption;
        this.options[this.options.length-1].value = newOption;
        this.options[this.options.length] = new Option('other','other');
      }
    }
  }
}

    

             

                                                        
            
            

              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              

                          
             
       
          
              
                                       

     查看其它6个回答


            
                         

                    



               
            

    发布评论: