When the text box gets the focus, empty the content, lose focus, and revert to the default value

There are times in the Web application where we need to remind the user to enter the value of the text box. To ensure that user input is correct, we can use JavaScript to solve this problem, such as requiring the user to enter a nickname:

<input type= "text" name= "Inpname" id= "Inpname" class= "text" size= "" tabindex= "1"/> <label for= "Inpname" > Name (*) </label></p>

Because sometimes, some users will temporarily forget to enter because of something. When the value of the text box is empty, we also continue to prompt. To ensure the validity of user input.

To insert code into: value= "Please enter your nickname ..." onfocus= "if (value = =" Please enter your nickname ... ') {value = '} ' onblur= ' if (value = = ') {value= ' Please enter your nickname ... '} '

The final effect: <input type= "text" name= "Inpname" id= "Inpname" class= "text" size= "" tabindex= "1" value= "Please enter your nickname ..." onfocus = "if (value = =" Please enter your nickname ... ') {value = '} ' onblur= ' if (value = = ') {value= ' Please enter your nickname ... '} "/> <label for=" Inpname "> Name (*) </label>

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<script>
Function OnEnter (field) {if (Field.value = = field.defaultvalue) {field.value = "";}}
function OnExit (field) {if (Field.value = = "") {field.value = Field.defaultvalue;}}
</script>
<input type=text value= the preset text onfocus=onenter (this) onblur=onexit;