在页面加载时根据RadioButton选择或值显示文本框

Question

So when I load a page I retrieve info from a DB and will check a radiobutton based on its value...

I need the textboxes to show initially - based on the radiobutton being already checked

works fine when I perform the click event, but I need to show the textboxes when the page loads because the 1st radiobutton is checked from the DB...

  <p>
  Show textboxes <input type="radio" name="radio1" value="Show" checked="checked">
  Do nothing <input type="radio" name="radio1" value="Nothing">
  </p>

  Wonderful textboxes:

  <div class="text"><p>Textbox #1 <input type="text" name="text1" id="text1" maxlength="30"></p></div>

  <div class="text"><p>Textbox #2 <input type="text" name="text2" id="text2" maxlength="30"></p></div>

Here is my FIDDLE - DEMO http://jsfiddle.net/rbla/5fq8q2bj/

here is the jquery using toggle

 $(document).ready(function() {
     $(".text").hide()
     $('[name=radio1]').on('change', function(){
        $('.text').toggle(this.value === 'Show');
     }).trigger('change');
 });

any ideas...

Answer 1

The reason your solution is not working is because you are going through all your radio inputs and then toggling the element based on its value— regardless if it is checked or not . So at runtime, this is what your script does:

1. Encounters the first radio element, triggers onchange event, fires onchange callback, and shows the .text element
2. Encounters the second radio element, triggers onchange event, fires onchange callback, and hides the .text element again

If you put a console log in your callback, you will realized that the .text element is shown and hidden in quick succession.

What you really want to do is only to perform the toggling when it is checked. Therefore, your example will work by simply enforcing a check that this.checked is truthy before performing the toggling:

$('[name=radio1]').on('change', function() {
  if (this.checked) {
    $('.text').toggle(this.value === 'Show');
  }
}).trigger('change');

See working example below:

 $(document).ready(function() { $(".text").hide() $('[name=radio1]').on('change', function() { if (this.checked) { $('.text').toggle(this.value === 'Show'); } }).trigger('change'); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <p> Show textboxes <input type="radio" name="radio1" value="Show" checked="checked"> Do nothing <input type="radio" name="radio1" value="Nothing"> </p> Wonderful textboxes: <div class="text"> <p>Textbox #1 <input type="text" name="text1" id="text1" maxlength="30"> </p> </div> <div class="text"> <p>Textbox #2 <input type="text" name="text2" id="text2" maxlength="30"> </p> </div>