I am implementing search and when i put nothing in search box this must be remain on same page what will be java script coding for that

I am implementing search and when i pu开发者_StackOverflowt nothing in search box this must be remain on same page what will be java script coding for that.

i just create function in java script and return false if string is null on button click it is not working.

As your text makes no sense I must guess what you want to say. You want your search form to not submit if field is empty and user clicks on search

on form attributes you use onsubmit

<form action="/" method="post" onsubmit="return checkForm(this)">
  <input type="text" name="searchText" id="searchText" />
  <input type="submit" value="search" />
</form>

now you check if searchText has any text and return true or false

<script type="text/javascript">
  function checkForm(form){
    if(form.searchText.value == ''){
       return false;
    }
    return true;
  }
</script>

I recommand to use JQuery for this kind of functionality, eg: for the following form

<form action="/myaction" method="post" id="myForm">
    <input type="text" value="" name="something1" />
    <input type="text" value="" name="something2" />
    <input type="submit" />
</form>

and in the same HTML file or in a separate JS file included via html HEADERS :

$(function () {
    $("#myForm").submit(function() {
          return ($(this).children("input").val()=='') ? false : true;
    });
});

or if you don't like ternary expression:

$(function () {
    $("#myForm").submit(function() {
        doSubmit = true;
        if ($(this).children("input").val()=='') {
            doSubmit = false;
        }
        return doSubmit;
    });
});

Using it this way, the function assume that all the fields of the form are not empty before posting data.

One other advantage of this method is that it doesn't alter the view code (this is some no intrusive javascript fashion) and can be much more easy to work with.

Hope it help.