問題描述

好吧，這很煩人，而且可能很簡單.我想用禁用的復選框開始我的網頁，然后選擇列表框中的特定行以啟用這些框.所以我把這個放在onload方法中

Ok this is very anoying, and it is probably very simple. I want to start my web page with disabled checkboxes, and after particlar line in listbox is selected to enable those boxes. So I put this in onload method

onload = function () {
   for (i = 0; i < document.frmMain.checkgroup.length; i++){
        document.frmMain.checkgroup[i].disabled = true ;
   }
}

它以禁用框開始我的頁面，現在我想啟用它們

it start my page with disabled boxes, now i want do enable them

function enableCheckboxes(){
    if (document.frmMain.Vrste[document.frmMain.Vrste.selectedIndex].value == "Sendvici i Rostilj"){
        for(i=0;i<document.frmMain.checkgroup.length;i++){
       document.frmMain.checkgroup[i].enabled = true;

        }
    }
}

它進入 for 循環，但它從不啟用這些復選框.我不知道為什么.

it goes in to the for loop, but it never enable those checkboxes. I cannot figure it why.

這是 html 部分，我在這里調用 enablecheckbox 函數:

and this is html part, where i call enablecheckbox function:

<select name="Vrste" onChange="PopulatePodvrste(); enableCheckboxes();"  size="8">
    <option value="Pica">Pica</option>
    <option value="Barbarina domaca trpeza">Barbarina domaca trpeza</option>
    <option value="Slana Palacinka">Slana Palacinka</option>
    <option value="Slatka Palacinka">Slatka Palacinka</option>
    <option value="Sendvici i Rostilj">Rostilj i sendvici</option>
    <option value="Dobro jutro sa Barbarom">Dobro jutro sa Barbarom</option>
    <option value="Chicken Meni">Chicken Meni</option>
    <option value="Posebna Ponuda">Posebna Ponuda</option>
    <option value="Salate">Salate</option>
</select>

最后是實際的復選框:

<input type="checkbox" name="checkgroup" >Susam</input><br>
<input type="checkbox" name="checkgroup" >Cili</input><br>
<input type="checkbox" name="checkgroup" >Tartar</input><br>
<input type="checkbox" name="checkgroup" >Urnebes</input><br>
<input type="checkbox" name="checkgroup" >Krastavac</input>

推薦答案

試試吧:

    document.frmMain.checkgroup[i].disabled = false ;

這篇關于javascript復選框啟用/禁用的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！