Simple example of JS getting the value of text box, drop-down box and radio button_javascript skills

1. Text box

1.1

Assign the value to variable t through var t=document.getElementById("test").value,

1.2 Of course, you can also assign known variable values ​​​​to the text box in reverse, for example:

var m = "5";
document.getElementById("test").value= m;

2. Drop-down list box

2.1

11
22
33

Get the value selected in the box through var s=document.getElementById("sel").value. The value="2" option is selected by default here, so the value assigned to variable s is "2 ",instead of "22",

If you want to assign the "value" selected in

such as "3" corresponding to the "text value" ("33") to the test text box, you can use the following method,

Copy code The code is as follows:

2.2 Compare the given value with the value in the box, if the value of in If the given values ​​are the same, select it.

Copy code

The code is as follows:var m = "2", for(var i = 0;i                                                                                                           >                                                                                                                                               🎜>                                                                                                                                    Marquee

The name attribute value of a row of radio button boxes must be the same, so that radio selection can be achieved.

Copy code


The code is as follows:

aaaaaaaaaa

bbbbbbbbb

Js gets the value and sum of the selected item in the drop-down box Text

Get the value and text of the selected item in the drop-down box under Firefox and IE:

1. Methods supported by both IE and Firefox:

Get text

Copy code The code is as follows:

var obj=document.getElementById( 'select_template');
var text=obj.options[obj.selectedIndex].text;//Get text

var obj=document.getElementById("select_template");

for(i=0;i

if(obj[i].selected==true) {

var text=obj[i].text;//Get text

}
}

Compared with the previous method, the two are simpler

1. IE supports Firefox but not:

Copy code The code is as follows:

var obj=document.getElementById(name);

for(i=0;i if(obj[i].selected==true) {
var text= obj[i].innerText;
}
}

The method of getting the value is common to IE and Firefox:
var value=document.getElementById("select_template").value;//Getting the value

Summary: In fact, the main reason is that both IE and Firefox support the value and text attributes, but Firefox does not support the innerText attribute.

Js implements opening a new link on the current page:
window.location.href=url;

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