javascript - Disable an input field if second input field is filled -

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totally newbie... want know how dynamically disable input field when second input field filled

eg:

<td><input type="text" name="num-input1" id="dis_rm"  value=""></input></td> <td><input type="text" name="num-input2" id="dis_per" value="" ></input></td>

pls... links , hints do...

you need give disabled property:

document.getelementbyid("dis_rm").disabled = true; document.getelementbyid("dis_per").disabled = true;

you can use on change event see if 1 of them filled:

var dis1 = document.getelementbyid("dis_rm"); dis1.onchange = function () {    if (this.value != "" || this.value.length > 0) {       document.getelementbyid("dis_per").disabled = true;    } }

so if first 1 filled, second 1 disabled


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