HTML input onfocus & onblur?

Question

ok, today I\'m making a helper HTML function. It looks like this:

function Input($name,$type,$lable,$value= null){
  if (isset($value)) {
    //if (this.value==\         


        

Answer 1

Looking at the source for this page shows the following

<form id="search" action="/search" method="get"> 
  <div> 
     <input name="q" class="textbox" tabindex="1" 
     onfocus="if (this.value=='search') this.value = ''" 
     type="text" maxlength="80" size="28" value="search"> 
  </div> 

Answer 2

Try this. Maybe it can help you:

<form action="/search" method="get">
<input type="text" name="q" value="Search..." onfocus="if (this.value == 'Search...') (this.value='')" onblur="if (this.value == '') (this.value='Search...')" />

Answer 3

You want this

<input ...
onfocus="if (this.value==this.defaultValue) this.value = ''"
onblur="if (this.value=='') this.value = this.defaultValue" />

Update: Some newer browsers will do what you want simply by adding the placeholder attribute:

<input placeholder="Please enter your name" />

Here is the PHP according to your code

echo <<<END
<label for="$name">$lable</label>
<input type="$type" name="$name" id="$name" value="$value" 
 onfocus="if (this.value==this.defaultValue) this.value = ''" 
 onblur="if (this.value=='') this.value = this.defaultValue"/>
END;

Answer 4

If I understand correctly, SO uses this line of HTML to do that effect.

<input name="q" class="textbox" tabindex="1" onfocus="if (this.value=='search') this.value = ''" type="text" maxlength="80" size="28" value="search"> 

Not related to your question, but you could and should replace your second if statement with an else statement.

function Input($name,$type,$lable,$value= null){
  if (isset($value)) {
    //if (this.value=='search') this.value = ''
    echo '<label for="'. $name .'">'. $lable .'</label><input type="'.$type.'" name="'. $name .'" id="'. $name .'" value="'.$value.'" onfocus="if (this.value==\''.$value.'\') this.value = \'\' "/>';  
  }
  else {
    echo '<label for="'. $name .'">'. $lable .'</label><input type="'.$type.'" name="'. $name .'" id="'. $name .'" />'; 
  }
}

Because if isset($value) returns false then you know for a fact that it isn't set since it can only return one of two values, true or false.

EDIT: Disregard this answer. It was not clear what the question was before the edit.

Answer 5

Or this if you want it to change back to default no matter what text is entered...

<input ... 
onfocus="if (this.value==this.defaultValue) this.value = ''" 
onblur="if (this.value!=this.defaultValue) this.value = this.defaultValue" />