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| Acmlm's Board - I2 Archive - Programming - JavaScript onclick help. |
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SyntaxLegend Double metal axe Level: 25  Posts: 202/222 EXP: 78264 For next: 11356 Since: 04-21-04 From: Australia Since last post: 20 days Last activity: 10 hours |
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| With javascript, is there anyway to make a textbox's value dissapear when it is a certain value. Like if the value of the textbox is "12345", only when the textbox is "12345" it sets it so there is nothing in the textbox, but if the textbox is "123456" it leaves it. Anyway to do that? |
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Narf Hi Tuvai! (reregistering while banned) Level: 16  Posts: 71/100 EXP: 17634 For next: 2622 Since: 12-26-04 Since last post: 22 hours Last activity: 14 hours |
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| onclick="if(this.value=='12345'){this.value=' ';}" | |||
BGNG Snifit Level: 22  Posts: 141/276 EXP: 56579 For next: 1771 Since: 06-03-05 Since last post: 8 days Last activity: 3 hours |
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| Yup. You can do that with a simple comparison check: <HTMl><Body> <Form> <Input Type="Text" Name="textbox"><BR> <Input Type="Button" Value="Click!" onClick="if (this.form.textbox.value == '12345') this.form.textbox.value = '';"> </form> </body></html> |
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neotransotaku Baby Mario 戻れたら、 誰も気が付く Level: 87 Posts: 3566/4016 EXP: 6220548 For next: 172226 Since: 03-15-04 From: Outside of Time/Space Since last post: 11 hours Last activity: 1 hour |
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| you may need some whitespace character trimming because i'm sure you know <space>12345 is not the same as 12345 (edited by neotransotaku on 07-15-05 08:58 PM) |
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BGNG Snifit Level: 22 Posts: 142/276 EXP: 56579 For next: 1771 Since: 06-03-05 Since last post: 8 days Last activity: 3 hours |
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| Okay... I've written a function for trimming off spaces and tabs from the beginning and end of strings. This HTML file will do what you want: <HTML><Head> <Script Language="JavaScript"> function Trim(In) { var T = In; var Tab = "\u0009"; var Space = " "; while (T.charAt(0) == Tab || T.charAt(0) == Space) T = T.substring(1, T.length); while (T.charAt(T.length - 1) == Tab || T.charAt(T.length - 1) == Space) T = T.substring(0, T.length - 1); return T; } </Script> </Head><Body> <Form> <Input Type="Text" Name="textbox"><BR> <Input Type="Button" Value="Click!" onClick="if (Trim(this.form.textbox.value) == '12345') this.form.textbox.value = '';"> </Form> </Body></HTML> |
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Ramsus Octoballoon Level: 19 Posts: 141/162 EXP: 34651 For next: 1126 Since: 01-24-05 From: United States Since last post: 39 days Last activity: 71 days |
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| <input type="text" onchange="if (parseInt(this.value) == 12345) this.value='';"> and for strings: <input type="text" onchange="if (this.value.match(/^\s*(12345)\s*/)) this.value='';"> (edited by Ramsus on 07-16-05 05:20 PM) (edited by Ramsus on 07-16-05 05:39 PM) |
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BGNG Snifit Level: 22 Posts: 146/276 EXP: 56579 For next: 1771 Since: 06-03-05 Since last post: 8 days Last activity: 3 hours |
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| The only things that are restrictive, Ramsus, is that 1) the "this.value" only works if the statement is triggered by the text input's events and 2) the string to check is the numeric value of 12345. What if we want to click a button and check for "zyxwv"? | |||
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SyntaxLegend Double metal axe Level: 25 Posts: 203/222 EXP: 78264 For next: 11356 Since: 04-21-04 From: Australia Since last post: 20 days Last activity: 10 hours |
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| I want it to be able to do it for alphanumeric, the "12345" was just an example. | |||
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Ramsus Octoballoon Level: 19 Posts: 142/162 EXP: 34651 For next: 1126 Since: 01-24-05 From: United States Since last post: 39 days Last activity: 71 days |
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Originally posted by BGNG 1. Change this.value to a reference to the value of the field you want to check and call it when you want the value checked. It's not brain surgery, and anyone who knows Javascript can do it in 10 seconds with a decent DOM reference. <script type="text/javascript" language="javascript"> <!-- function checkInput(form) { if (form.exampleInput.value.match(/^\s*(12345)\s*/$)) form.exampleInput.value = ''; return false; } // --> </script> <form onsubmit="return checkInput(this);" action="" method="GET"> <input type="text" name="exampleInput"> <input type="submit"> </form> From the original post though, it sounded as though he wanted to check the input after the user changed it, not after pushing a button. 2. Did you even look at the second example? <input type="text" onchange="if (this.value.match(/^\s*(zyxwv)\s*/$)) this.value='';"> Javascript has had regular expressions for a long time. Works in Mozilla, Safari, and IE mac, and is well documented as working in IE4 by MSDN. EDIT: As a form with a button: <script type="text/javascript" language="javascript"> <!-- function checkInput(form) { if (form.exampleInput.value.match(/^\s*(zyxwv)\s*/$)) form.exampleInput.value = ''; return false; } // --> </script> <form onsubmit="return checkInput(this);" action="" method="GET"> <input type="text" name="exampleInput"> <input type="submit"> </form> This also has the added benefit of simply running checkInput() on the form if the user hits enter. If you want to actually submit the form, change checkInput so it returns true. It'll check the input with checkInput, and then submit the form. (edited by Ramsus on 07-16-05 11:18 PM) (edited by Ramsus on 07-16-05 11:33 PM) |
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