Fill in a form with jQuery

问题:

I am trying to use jQuery to fill in a form with some default values.

The form is contained in a div which has an id. In fact every element has an id, I did so just to be able to quickly select every piece of the form using $("#id") syntax.
Here is the form:

<div id="panel" style="position: absolute; left: 190px; top: 300px; width: 400px; height: 300px; border: medium groove brown; background: none repeat scroll 0% 0% black; z-index: 100; color: white;"><form id="form_coord_0">  
X <input type="text" style="height: 25px; font-size: 10px;" size="2" name="X" id="coordX_0"/>  
Y <input type="text" style="height: 25px; font-size: 10px;" size="2" name="Y" id="coordY_0"/>  
<input type="button" id="edit_0" value="M"/>  
<input type="button" id="remove_0" value="-"/>  
<input type="button" id="add_0" value="+"/>  
<input type="button" id="go_0" value="go!"/>  
<br/>  
</div>  

I need to set the coordX_0 text field with some value, let's say: 123.

I thought I could do

$("#coordX_0").text.value = 123;  

But it doesn't seem to work. Any hint?

回答1:

You can use the val() function to set input values

$("#coordX_0").val(123);  

Incidentally, your original code could be made to work by setting value property on the actual, underlying dom element. You access the dom element by indexing your jQuery results:

$("#coordX_0")[0].value = 123;  

回答2:

All the answers are the exact same so I thought I'd post something different:

var inputs_to_values = {
    'coordX_0' : 'some value',
    'coordY_0' : 'some other value',
    'edit_0'   : 'N',
    'remove_0' : '_',
    'add_0'    : '-',
    'go_0'     : 'stop?'
};
$('#form_coord_0').find('input').val(function (index, value) {
    return inputs_to_values[this.id];
});

You can pass .val() a function, whatever is returned from the function for each element will be the new value:

A function returning the value to set.

this is the current element.

Receives the index position of the element in the set and the old value as arguments.

Source: http://api.jquery.com/val

The above code expects that each input will have a property in the inputs_to_values object so you can convert the ID of the input to the new value for that input.

Here is a demo: http://jsfiddle.net/zYfpE/

回答3:

To set the value of an input field its

$("#coordX_0").val(123)

回答4:

$("#coordX_0").val("123");

You need the quotes too I think. Although it might work both ways.

回答5:

Try this instead, using the val method:

$("#coordX_0").val('some string or number');

回答6:

Just write:

$("#coordX_0").val(123);

In jQuery, text is a function to extract text in dom.

回答7:

Use val method to set the text of any input field.

$("#coordX_0").val(123);

回答8:

use the val function

$("#coordX_0").val("123");

回答9:

Use this instead:

$("#coordX_0").val("123");