javascript - How to make web form appear after previous web form has data entered into it? -


i'm looking make second web form appear after first web form has entered it. i'm using sinatra set slim templating engine, , pure javascript. 

input#topic value="enter topic" onfocus="this.value = this.value=='enter topic'?'':this.value;" onblur="this.value = this.value==''?'enter topic':this.value;"  input#subtopic value="enter subtopic" onfocus="this.value = this.value=='enter subtopic?'':this.value;" onblur="this.value = this.value==''?'enter subtopic':this.value;"

the above 2 forms, onfocus , onblur make form value disappear , reappear if clicked on.

my javascript follows. 

function checkfield(field) {     if(field.value != null) {         document.getelementbyid('subtopic_form').style.display = 'true';     } else {         document.getelementbyid('subtopic_form').style.display = 'false';     } }

this doesn't work, , part of problem when add input tags 

onchange="checkfield(this)"

then function unused message inside javascript file, though have specified in home.slim file

script src="/js/application.js"

any work need appreciated. i'm open using jquery this, , if there way make second form have effect upon appearance that'd awesome.

-adam

the display property accepts several values, true , false not among them. full list, go mdn or w3schools or msdn. can tell right now, values want "none" , "block", in:

function checkfield(field) {     if(field.value != null && field.value != '') {         document.getelementbyid('subtopic_form').style.display = 'block';     } else {         document.getelementbyid('subtopic_form').style.display = 'none';     } }

with jquery, though, code quite bit cleaner! 

function checkfield(field) {     if (field.value != null && field.value != '') {         $("#subtopic_form").show();     } else {         $("#subtopic_form").hide();     } }

or 

$("#topic").change(function(){     if ($(this).val()) {         $("#subtopic_form").show();     } else {         $("#subtopic_form").hide();     } });

and if want effects, consider jquery's .fadeout() or .slideup() in place of .hide()

note added field.value != '' code. also, best use !== instead of !=.

:)


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