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Editorial Team
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Asked: 2026-05-23T11:22:05+00:00

I would like to change the text in the textbox id=1 when different radio

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I would like to change the text in the textbox id=”1″ when different radio buttons are focused. I thought it would work with “this.value” but somehow it dosn’t. Has someone any idea how to solve this?

Regards! 

   <head>
     <title>Test</title>
     <script type="text/javascript">
        var a = function(){

            if(this.value == "p"){

                document.getElementById("1").value = "Question product";

            }
            else if(this.value== "v"){

                document.getElementById("1").value = "Question contract";

            }

            else if(this.value== "t"){

                document.getElementById("1").value = "Question technology";

            }

        }
     </script>

   </head>

   <body>
     <input type="radio" name="typ" value="p" onfocus="a()"/> product
     <input type="radio" name="typ" value="v" onfocus="a()"/> contract 
     <input type="radio" name="typ" value="t" onfocus="a()"/> technology 
     <br />
     <input type="text" value="Question" size="46" id="1"/>
   </body>

</html>
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1 Answer

  1. Editorial Team

    Do not use focus but onclick and please use an array and give the field an ID beginning with a letter or underscore

    <head>
     <title>Test</title>
     <script type="text/javascript">
      var questionDescription={
        p:"Question product",
        v:"Question contract",
        t:"Question technology"
      }
      window.onload=function(){
        var typ=document.getElementsByName("typ");
        for (var i=0,n=typ.length;i<n;i++) {
          typ[i].onclick=function() {
            document.getElementById("q1").value=questionDescription[this.value]
          }
        }
     }
     </script>

   </head>

   <body>
     <input type="radio" name="typ" value="p" /> product
     <input type="radio" name="typ" value="v" /> contract 
     <input type="radio" name="typ" value="t" /> technology 
     <br />
     <input type="text" value="Question" size="46" id="q1"/>
   </body>

</html>
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