html - How can I run a JavaScript function by taking user input & using a button? - 


<!doctype html>  <html>  <head> <title> daily recommended exercise </title>  </head>  <body>  <h2>your daily exercise schedule</h2>      <p>please select age group:</p>  <form>  0 - 5: <input type = "radio" name = "pickage" value = "age1"> <br/> 6 - 17: <input type = "radio" name = "pickage" value = "age2"> <br/> 18 - 64: <input type = "radio" name = "pickage" value = "age3"> <br/> 65 - 150: <input type = "radio" name = "pickage" value = "age4"> <br/>  <input type="button" onclick = "exerciserecommend();" value = "enter"></input>  </form>  <script type = "text/javascript"> function exerciserecommend() { var age = document.getelementsbyname("pickage");  if (age=="age1") {     alert("physical activity in infants , young children necessary     healthy growth , development. there no guidelines children @ age      though regular physical activity recommended."); } else if (age=="age2") {     alert("at age should 60 minutes or more of physical activity each day. includes, aerobic endurance , strength exercises."); } else if (age=="age3") {     alert("at age should doing 2 hours , thirty minutes or more of moderate aerobic endurance , strength exercises activity every week or 1 hour fifteen minutes of intense aerobic endurance , strength exercises activity or mix of two."); } else if (age=="age4") {     alert("at age should exercising 2-3 hours week. recommended should doing mild endurance , strength activities."); } }  </script>   </body>  </html>

what wrong code? whenever press button nothing happens!! have tried again , again reason not finding user input , outputting alert values! please help!

shashank correct best practice attach event listener through js itself, in case i'll assume you're learning language , want know what's , how works.

so, let's take @ age variable. if console.log(age) after define it, return node list of of elements name "pickage". want specific 1 of those, checked one.

//  list of select-able ages var allages = document.getelementsbyname("pickage"); //  define variable hold our selected age var age;  //  iterate through of select-able ages (i = 0; < allages.length; i++) {     //  if selected age checked, set "age" variable     if (allages[i].checked === true) {         //  grab value here because that's check later         age = allages[i].value;     } }

that should give correct result work if < alert. might want add else statement @ end in case user doesn't select age, though.

just make sure know, isn't best practice, efficient, or best way of doing this. quick example understand process bit basis language.


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