jquery - get value from textbox does not work -


for javascript code tried 2 alternative solutions in get value in input text box, answer 2 rjd22, pls see code below. option works fine, option b doesnt; console shows 'undefined' when enter figure (or text).

any idea why b not work? use option want validate form field has been filled in, , val() description (http://api.jquery.com/val/) cannot see val() returns when no value has been filled in.

thnx comments in advance.

html code:

</label> <input id="usage" type="text" name="usage">

javascript code:

this.usage = $("#usage").val(); //option a:  works  this.usage = $("#usage").attr("value"); //option b: doesnt work  console.log(this.usage);

val() returns '' (empty string) when no value has been entered. should use val() instead of prop or attr.

fiddle.


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