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| 1 | +Helper Functions |
| 2 | +============================== |
| 3 | + |
| 4 | +vConsole provides some useful helper functions for efficient plugin development. |
| 5 | + |
| 6 | +Helper functions are mounted in different vConsole properties according to their usage: |
| 7 | + |
| 8 | +- `vConsole.tool`: Helper functions. |
| 9 | +- `vConsole.$`: DOM-related functions. |
| 10 | + |
| 11 | + |
| 12 | +## vConsole.tool |
| 13 | + |
| 14 | +### vConsole.tool.isString(value) |
| 15 | +### vConsole.tool.isArray(value) |
| 16 | +### vConsole.tool.isBoolean(value) |
| 17 | +### vConsole.tool.isElement(value) |
| 18 | +### vConsole.tool.isFunction(value) |
| 19 | +### vConsole.tool.isNull(value) |
| 20 | +### vConsole.tool.isNumber(value) |
| 21 | +### vConsole.tool.isObject(value) |
| 22 | +### vConsole.tool.isSymbol(value) |
| 23 | +### vConsole.tool.isUndefined(value) |
| 24 | + |
| 25 | +Check whether a value is a certain type. |
| 26 | + |
| 27 | +##### Return: |
| 28 | +- Boolean |
| 29 | + |
| 30 | + |
| 31 | + |
| 32 | +### vConsole.tool.htmlEncode(text) |
| 33 | + |
| 34 | +Encode a text into a HTML non-sensitive string. |
| 35 | + |
| 36 | +##### Parameters: |
| 37 | +- (required) text: A string to be encoded. |
| 38 | + |
| 39 | +##### Return: |
| 40 | +- String |
| 41 | + |
| 42 | + |
| 43 | + |
| 44 | +### vConsole.tool.setStorage(key, value) |
| 45 | + |
| 46 | +Set data to `localStorage`. A prefix `vConsole_` will be added to `key` automatically. |
| 47 | + |
| 48 | +Note that some devices may not have `localStorage` and then `value` would not be saved under this situation, so DO NOT use this method to save permanent data. |
| 49 | + |
| 50 | +##### Parameters: |
| 51 | +- (required) key: A string, the name of data. |
| 52 | +- (required) value: A string, the value of data. |
| 53 | + |
| 54 | +##### Return: |
| 55 | +- None |
| 56 | + |
| 57 | +##### Example: |
| 58 | + |
| 59 | +```javascript |
| 60 | +vConsole.tool.setStorage('count', 1); |
| 61 | +``` |
| 62 | + |
| 63 | + |
| 64 | + |
| 65 | +### vConsole.tool.getStorage(key) |
| 66 | + |
| 67 | +Get data from `localStorage`. A prefix `vConsole_` will be added to `key` automatically. |
| 68 | + |
| 69 | +##### Parameters: |
| 70 | +- (required) key: A string, the name of data. |
| 71 | + |
| 72 | +##### Return: |
| 73 | +- String, the value of data. |
| 74 | + |
| 75 | +##### Example: |
| 76 | + |
| 77 | +```javascript |
| 78 | +var num = vConsole.tool.setStorage('count'); // => 1 |
| 79 | +``` |
| 80 | + |
| 81 | + |
| 82 | + |
| 83 | +## vConsole.$ |
| 84 | + |
| 85 | +### vConsole.$.one(selectors, baseElement) |
| 86 | + |
| 87 | +Returns the first element within the document or baseElement that matches the specified group of selectors. |
| 88 | + |
| 89 | +##### Parameters: |
| 90 | +- (required) selectors: A string containing one or more CSS selectors separated by commas. |
| 91 | +- (optional) baseElement: An element object, default to be `document`. |
| 92 | + |
| 93 | +##### Return: |
| 94 | +- Element object |
| 95 | + |
| 96 | +##### Example: |
| 97 | + |
| 98 | +```javascript |
| 99 | +var $page = vConsole.$.one('#my_page'); |
| 100 | +var $item = vConsole.$.one('.item', $page); |
| 101 | +``` |
| 102 | + |
| 103 | + |
| 104 | +### vConsole.$.all(selectors, baseElement) |
| 105 | + |
| 106 | +Returns a list of elements within the document or baseElement that matches the specified group of selectors. |
| 107 | + |
| 108 | +##### Parameters: |
| 109 | +- (required) selectors: A string containing one or more CSS selectors separated by commas. |
| 110 | +- (optional) baseElement: An element object, default to be `document`. |
| 111 | + |
| 112 | +##### Return: |
| 113 | +- Element object |
| 114 | + |
| 115 | +##### Example: |
| 116 | + |
| 117 | +```javascript |
| 118 | +var $page = vConsole.$.one('#my_page'); |
| 119 | +var $items = vConsole.$.all('.item', $page); |
| 120 | +``` |
| 121 | + |
| 122 | + |
| 123 | +### vConsole.$.addClass(elements, className) |
| 124 | + |
| 125 | +Add the specified class(es) to element(s). |
| 126 | + |
| 127 | +##### Parameters: |
| 128 | +- (required) elements: A single or a list of element object(s). |
| 129 | +- (required) className: A string of one or more space-separated classes. |
| 130 | + |
| 131 | +##### Return: |
| 132 | +- None |
| 133 | + |
| 134 | +##### Example: |
| 135 | + |
| 136 | +```javascript |
| 137 | +var $items = vConsole.$.all('.item'); |
| 138 | +vConsole.$.addClass($items, 'selected'); |
| 139 | +``` |
| 140 | + |
| 141 | + |
| 142 | +### vConsole.$.removeClass(elements, className) |
| 143 | + |
| 144 | +Remove the specified class(es) of element(s). |
| 145 | + |
| 146 | +##### Parameters: |
| 147 | +- (required) elements: A single or a list of element object(s). |
| 148 | +- (required) className: A string of one or more space-separated classes. |
| 149 | + |
| 150 | +##### Return: |
| 151 | +- None |
| 152 | + |
| 153 | +##### Example: |
| 154 | + |
| 155 | +```javascript |
| 156 | +var $items = vConsole.$.all('.item'); |
| 157 | +vConsole.$.removeClass($items, 'selected'); |
| 158 | +``` |
| 159 | + |
| 160 | + |
| 161 | +### vConsole.$.hasClass(element, className) |
| 162 | + |
| 163 | +Check whether an element is assigned the given class. |
| 164 | + |
| 165 | +##### Parameters: |
| 166 | +- (required) element: An element object. |
| 167 | +- (required) className: A string. |
| 168 | + |
| 169 | +##### Return: |
| 170 | +- Boolean |
| 171 | + |
| 172 | +##### Example: |
| 173 | + |
| 174 | +```javascript |
| 175 | +var $page = vConsole.$.one('#my_page'); |
| 176 | +if (vConsole.$.hasClass($page, 'actived')) { |
| 177 | + // do something |
| 178 | +} |
| 179 | +``` |
| 180 | + |
| 181 | + |
| 182 | +### vConsole.$.bind(elements, eventType, fn, useCapture) |
| 183 | + |
| 184 | +Bind an event to element(s). |
| 185 | + |
| 186 | +##### Parameters: |
| 187 | +- (required) elements: A single or a list of element object(s). |
| 188 | +- (required) eventType: A string of event's type. |
| 189 | +- (required) fn: A function to execute when the event is triggered. |
| 190 | +- (optional) useCapture: A boolean that indicates the event uses capturing or bubbling, default to be `false`. |
| 191 | + |
| 192 | +##### Return: |
| 193 | +- None |
| 194 | + |
| 195 | +##### Example: |
| 196 | + |
| 197 | +```javascript |
| 198 | +var $btn = vConsole.$.one('#submit'); |
| 199 | +vConsole.$.bind($btn, 'click', function(event) { |
| 200 | + event.preventDefault(); |
| 201 | + alert('submit!'); |
| 202 | +}); |
| 203 | +``` |
| 204 | + |
| 205 | + |
| 206 | +### vConsole.$.delegate(element, eventType, selectors, fn) |
| 207 | + |
| 208 | +Bind an event to an element, and only this element's descendants which match the selectors can trigger the event. |
| 209 | + |
| 210 | +##### Parameters: |
| 211 | +- (required) element: An element object. |
| 212 | +- (required) eventType: A string of event's type. |
| 213 | +- (required) selectors: A string containing one or more CSS selectors separated by commas. |
| 214 | +- (required) fn: A function to execute when the event is triggered. |
| 215 | + |
| 216 | +##### Return: |
| 217 | +- None |
| 218 | + |
| 219 | +##### Example: |
| 220 | + |
| 221 | +```javascript |
| 222 | +var $page = vConsole.$.one('#my_page'); |
| 223 | +vConsole.$.delegate($page, 'click', '.item', function(event) { |
| 224 | + vConsole.$.addClass(this, 'selected'); // this => '.item' |
| 225 | +}); |
| 226 | +``` |
| 227 | + |
| 228 | + |
| 229 | +### vConsole.$.render(tpl, data, toString) |
| 230 | + |
| 231 | +Compile a template into an element object or a HTML string with given data. |
| 232 | + |
| 233 | +##### Parameters: |
| 234 | +- (required) tpl: A template string. |
| 235 | +- (required) data: A key-value data which is used to render the template. |
| 236 | +- (optional) toString: A boolean that indicates whether returns an element object or a HTML string, default to be `false`. |
| 237 | + |
| 238 | +##### Return: |
| 239 | +- Element object or HTML string |
| 240 | + |
| 241 | +##### Syntax: |
| 242 | + |
| 243 | +If: |
| 244 | +```html |
| 245 | +{{if}} |
| 246 | + ... |
| 247 | +{{else}} |
| 248 | + ... |
| 249 | +{{/if}} |
| 250 | +``` |
| 251 | + |
| 252 | +For: |
| 253 | +```html |
| 254 | +{{for (var i=0; i<10; i++)}} |
| 255 | + ... |
| 256 | + {{continue}} |
| 257 | + {{break}} |
| 258 | +{{/for}} |
| 259 | +``` |
| 260 | + |
| 261 | +Switch: |
| 262 | +```html |
| 263 | +{{switch (flag)}} |
| 264 | + {{case 1}} |
| 265 | + ... |
| 266 | + {{break}} |
| 267 | + {{default}} |
| 268 | + ... |
| 269 | +{{/switch}} |
| 270 | +``` |
| 271 | + |
| 272 | +Print: |
| 273 | +```html |
| 274 | +{{flag}} |
| 275 | +``` |
| 276 | + |
| 277 | +###### Example: |
| 278 | + |
| 279 | +```javascript |
| 280 | +var tpl = '<ul>' + |
| 281 | + '{{for (var i = 0; i < list.length; i++)}}' + |
| 282 | + '<li>' + '{{list[i]}}' + '</li>' + |
| 283 | + '{{/for}}' + |
| 284 | +'</ul>'; |
| 285 | +var data = { |
| 286 | + list: ['Red', 'Blue', 'Yellow'] |
| 287 | +}; |
| 288 | + |
| 289 | +var html = vConsole.&.render(tpl, data, true); |
| 290 | +document.body.innerHTML += html; |
| 291 | +``` |
| 292 | + |
| 293 | +Output: |
| 294 | + |
| 295 | +```html |
| 296 | +<ul> |
| 297 | +<li>Red</li> |
| 298 | +<li>Blue</li> |
| 299 | +<li>Yellow</li> |
| 300 | +</ul> |
| 301 | +``` |
| 302 | + |
| 303 | + |
| 304 | +[Back to Index](./a_doc_index.md) |
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