Change value of input onchange

Question

I am trying to create a simple JavaScript function  When someone inserts a number in an input field  the value of another field should change to that value  Here is what I have at the moment  function updateInput ish          fieldname value   ish         lt input type  quot text quot  name  quot fieldname quot  id  quot fieldname quot    gt     lt input type  quot text quot  name  quot thingy quot  onchange  quot updateInput value  quot    gt    Somehow this does not work  can someone help me out

User · Answer

for jQuery we can use below   by input name      input name  textboxname     val  some value      by input class      input type text  textboxclass   val  some value      by input id       textboxid   val  some value

User · Answer

You can t access your fieldname as a global variable  Use document getElementById   function updateInput ish       document getElementById  fieldname   value   ish      and  onchange  updateInput this value

[javascript] Change value of input onchange?

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