Javascript: Difference between revisions
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** <nowiki>$("#selector_id").css("display", "");</nowiki> or <nowiki>$("#selector_id").css("display", "block");</nowiki> | ** <nowiki>$("#selector_id").css("display", "");</nowiki> or <nowiki>$("#selector_id").css("display", "block");</nowiki> | ||
** <nowiki>$("#selector_id").css("display", "none");</nowiki> | ** <nowiki>$("#selector_id").css("display", "none");</nowiki> | ||
== form submit validation == | |||
* [http://www.w3schools.com/jsref/event_form_onsubmit.asp Form onsubmit Event]. code snippet<ref>[http://www.w3schools.com/js/js_form_validation.asp JavaScript Form Validation]</ref>: | |||
<pre> | |||
<form name="myForm" action="demo_form.asp" onsubmit="return validateForm()" method="post">... | |||
</pre> | |||
* jQuery .submit()<ref>[http://api.jquery.com/submit/ .submit() | jQuery API Documentation]</ref> | |||
<pre> | |||
$(document).ready(function(){ | |||
$('#form').submit( function(){ | |||
return validateForm(); | |||
}); | |||
}); | |||
function validateForm() | |||
{ | |||
if ( condition ) | |||
{ | |||
alert('form was not validated'); | |||
return false; | |||
} | |||
} | |||
</pre> | |||
* [http://jqueryvalidation.org/ jQuery Validation Plugin | Form validation with jQuery]<ref>[http://brooky.cc/2011/08/04/using-jquery-validation-plugin-for-form-validation/ 好用的表單驗證工具 – jQuery validation plugin | brooky's blog]</ref> | |||
== Count the number of visible table rows == | == Count the number of visible table rows == | ||
Revision as of 10:13, 18 October 2013
Javascript approaches to do the same task
Get the document by id
- document.getElementById('abcId')
- alternative: (1) Get the id attribute by using jQuery .attr(): $("selector").attr("id"); (example) and (2) go to the first step
- parallel naming rules for html elemnt tags ex: (1)<input id='checkbox_id1' > & <select id="select_id1"> (2)Replace the input id to select id. Code snippet as follows:
var selectId = inputId.replace("checkbox_", "select_");
Changing HTML Content
- Using jQuery .html()[1] $("#selected_id").html(htmlStr);
- JavaScript HTML DOM Changing HTML Content document.getElementById(selected_id).innerHTML = htmlStr;
I met technical issue to replace the select text in IE 
v.8
input selector
- jQuery :input Selector "Selects all input box, textarea, select and button elements" Cited from :input Selector
- jQuery $("form#formID input[type=text]") Selects all input Text Fields belonging to the form with id: formID[2]
Create HTML select option
- from JSON hash: javascript - How to create HTML select option from JSON hash? - Stack Overflow
- from javascript array: JavaScript - populate drop down list with array - Stack Overflow
HTML DOM selected
- HTML[3]
- jQuery: .prop()[4]
- jQuery .attr() ex: $("#myDropDown option:text=" + myText +"").attr("selected", "selected"); [5]
Display or hide the element by id
- HTML DOM Style object
- document.getElementById( selector_id ).style.display = "none";
- Using jQuery .show() or .hide():
- $("#selector_id").show(); or
- $("#selector_id").hide();
- Using jQuery .css():
- $("#selector_id").css("display", ""); or $("#selector_id").css("display", "block");
- $("#selector_id").css("display", "none");
form submit validation
- Form onsubmit Event. code snippet[6]:
<form name="myForm" action="demo_form.asp" onsubmit="return validateForm()" method="post">...
- jQuery .submit()[7]
$(document).ready(function(){
$('#form').submit( function(){
return validateForm();
});
});
function validateForm()
{
if ( condition )
{
alert('form was not validated');
return false;
}
}
Count the number of visible table rows
- $('#selector_id:visible').length; jQuery v.1.9.1[9]
- $('#selector_id:not([style*="display: none"])').length; jQuery v.1.9.1 + IE v.8 not work
count the number of all table rows (includes visible and invisible rows)
- document.getElementById( table_id ).rows.length;
JSON tools
Online services
Browser extensions
- JSON Formatter for Chrome
(similar extension: JSONView)
Editor plugins
- JSON Viewer[1] for Notepad++
standalone
- JSON Viewer 解壓縮直接執行 JsonView\JsonView.exe (免安裝即可執行)
compression tools
troubleshooting steps
- Using the javascript library?
- Checking browser compatibility
- Javascript location: (1)JavaScript in <head> or <body> ex: .click(), (2)JavaScript in <input> tag or other DOM elements' tag ex: <button type="button" onclick="myFunction()" id="buttonId">Try it</button>[10]
more on Javascript debug
references
- ↑ javascript - JQuery html() vs. innerHTML - Stack Overflow
- ↑ javascript - jquery get all input from specific form - Stack Overflow
- ↑ HTML option selected Attribute
- ↑ select - jQuery Set Selected Option Using Next - Stack Overflow
- ↑ javascript - jQuery - setting the selected value of a select control via its text description - Stack Overflow
- ↑ JavaScript Form Validation
- ↑ .submit() | jQuery API Documentation
- ↑ 好用的表單驗證工具 – jQuery validation plugin | brooky's blog
- ↑ jquery selector to count the number of visible table rows? - Stack Overflow
- ↑ JavaScript How To
further reading