- Tech
- Option object
Add and Delete Option Object </ Title></p>
<p><script language = "javascript"></p>
<p>// Add option</p>
<p>Function AddOption (POS) {</p>
<p>Var objselect = document.myform.myselect;</p>
<p>// Take a field value</p>
<p>Var strname = document.myform.myoptionname.value;</p>
<p>Var strval = document.myform.myoptionValue.Value;</p>
<p>// Establish an Option object</p>
<p>Var objoption = new option (strname, strvalue);</p>
<p>IF (POS == -1 & POS> Objselect.Options.LENGTH)</p>
<p>Objselect.Options [objselect.Options.Length] = Objoption;</p>
<p>Else</p>
<p>Objselect.Add (Objoption, POS);</p>
<p>}</p>
<p>// Delete Options</p>
<p>Function deleteOption (TYPE) {</p>
<p>Var objselect = document.myform.myselect;</p>
<p>IF (Type == True)</p>
<p>Objselect.Options [objselect.selectedIndex] = NULL;</p>
<p>Else</p>
<p>Objselect.remove (objselect.selected ";</p>
<p>}</p>
<p>// Display option information</p>
<p>Function showoption (objform) {</p>
<p>Var objselect = objform.myselect;</p>
<p>Var name = objselect.Options [objselect.selected ".TEXT;</p>
<p>VAR value = objselect.Options [objselect.selected ".value;</p>
<p>Alert (Name "=" value);</p>
<p>}</p>
<p></ script></p>
<p></ hEAD></p>
<p><body></p>
<p><H2> Add and Delete Option Objects </ h2></p>
<p><hr></p>
<p><form name = "myform"></p>
<p><select name = "myselect"></p>
<p><option value = "China" SELECTED> China </ option></p>
<p><option value = "Japan"> Japan </ option></p>
<p><option value = "United States"> United States </ option></p>
<p></ select></p>
<p><Input Type = "Button" οnclick = "showoption (this.form)" Value = "Show"></p>
<p><Input Type = "Button" οnclick = "deleteOption" value = "Delete"></p>
<p><Input type = "button" οnclick = "deleteOption (false)" value = "Remove method"> <br> <br> Options Name: <input type = "text" name = "myOptionName" value = "United Kingdom"> < Br></p>
<p>Value of the option: <input type = "text" name = "myoptionValue" value = "value4"></p>
<p><Input Type = "Button" οnclick = "addOption (-1)" Value = "Add"></p>
<p><Input Type = "Button" οnclick = "addOption (0)" Value = "Insert"></p>
<p></ form></p>
<p></ body></p>
<p></ html></p></div><div class="text-center mt-3 text-grey">
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