How to clear text field on focus of text field

Question

我想在用户点击它时清除文本字段

<input name="name" type="text" id="input1" size="30" maxlength="1000" value="Enter Postcode or Area" onfocus=="this.value=''" />

Answer 1

Unless you are doing something specific where you only want to clear onclick, I would suggest (as others have noted) to use the onfocus actions instead. This way if someone is using tab to navigate it will also clear the default text.

You can also use onblur to check if it's empty to bring it back:

 <input type="text" value="Default text" name="yourName" onfocus="if(this.value == 'Default text') { this.value = ''; }" onblur="if(this.value == '') { this.value = 'Default text'; }">

Answer 2

To do this you will need to use a scripting language, probably javascript. Here an example

<input type='text' value'Some text' onclick='javascript: this.value = ""' />

Hope this helps.

Edit:

To meet what David is explain here is a second example in case that is what you are looking for

<script type='javascript'>
    var clear = true;
    function clear(obj)
    {
        if(clear)
        {
            obj.value = '';
            clear = false;
        }
    }
</script>

<input type='text' value'Some text' onfocus='clear(this);' />

Answer 3

Using jQuery library:

<input id="clearme" value="Click me quick!" />

$('#clearme').focus(function() { 
  $(this).val(''); 
});

Answer 4

或者你可以简单地使用占位符属性例如<input name="name" type="text" id="input1" size="30" maxlength="1000" placeholder="Enter Postcode or Area"/>

Answer 5

You can use <input ... onfocus="this.value='';"/> .

This way, the field will be cleared when it gains focus. However, if you only want to clear it when user clicks on it (ie not when the field gains focus with the keyboard for example), then use onclick instead of onfocus .

However, as pointed by David Dorward in a comment, this behavior may not be expected by the user. So be careful to set this feature on really specific fields (such as search field).

Answer 6

This is how I use it for a temperature converter/calculator - when the user types (keyup), the text input box calculates using the assigned function; when the user selects the other text input (there are only two inputs), the selected text input will clear.

HTML:

<p class="celcius"><h2 style="color:#FFF">Input:</h2>
    <input name="celsius" type="text" class="feedback-input" placeholder="Temperature (Celsius)" onkeyup="Conversion()" onfocus="this.value='';" id="celsius" />
</p>

  <hr>

  <h2 style="color:#FFF">Result:</h2>

<p class="fahrenheit">
    <input name="fahrenheit" type="text" class="feedback-input" id="fahrenheit" onkeyup="Conversion2()" onfocus="this.value='';"placeholder="Temperature (Fahrenheit)" />
  </p>  

JavaScript:

function Conversion() {
    var tempCels = parseFloat(document.getElementById('celsius').value);
      tempFarh =(tempCels)*(1.8)+(32);
      document.getElementById('fahrenheit').value= tempFarh;
 }

function Conversion2() {
    var tempFarh = parseFloat(document.getElementById('fahrenheit').value);
      tempCels =(tempFarh - 32)/(1.8);
      document.getElementById('celsius').value= tempCels;
 }

Answer 7

try this ,it worked for me

add this into your input tag

<code>
onfocus="this.value='';"</code>

for example if your code is

<code>
<input type="text" value="Name" /></code>

use it like this

<code><input onfocus="this.value='';" type="text" value="Name" /></code>

Answer 8

function Clear (x) {if (x.cleared) {} else {x.value = ""; x.cleared = true}}

onfocus = "Clear (this)"

Answer 9

Add a following script to your js file:

var input1 = document.getElementById("input1")

input1.onfocus = function() {
  if(input1.value == "Enter Postcode or Area") {
      input1.value = "";
  } 
};

input1.onblur = function() {
    if(input1.value == "") {
       input1.value = "Enter Postcode or Area";
   } 
 };